ML12340A518: Difference between revisions
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{{#Wiki_filter:PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal | {{#Wiki_filter:PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal | ||
#: DUK123310066 | #: DUK123310066 | ||
: 1) 01820 J R ELKINS- ECO81 2) 02388 BOB SCHOMAKER LYNCHBG, VA 3) 02532 RESIDENT NRC INSPECT MG01NRC 4) 02546WC LIBRARY -MG01WC 5) 03044 MCG DOC CNTRL MISC MAN MG05DM 6) 03614 MCG OPS PROCEDURE GP MG010P 7) 03743 MCG QA TEC SUP MNT QC MG01MM 8) 03744 OPS TRNG MGR. MG03OT 9) 03759 U S NUC REG WASHINGTON, DC 10) 03796 SCIENTECH CLEARWTR, FL 11) 04698 D E BORTZ EC08G 12) 04809 MCG PLANT ENG. LIBR. MG05SE 13) 05262 J L FREEZE MG011E 14) 05606 J C MORTON MG01EP 15) 08103 WESTINGHOUSE ELECTRIC CO LLC Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS)TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION | : 1) 01820 J R ELKINS- ECO81 2) 02388 BOB SCHOMAKER LYNCHBG, VA 3) 02532 RESIDENT NRC INSPECT MG01NRC 4) 02546WC LIBRARY -MG01WC 5) 03044 MCG DOC CNTRL MISC MAN MG05DM 6) 03614 MCG OPS PROCEDURE GP MG010P 7) 03743 MCG QA TEC SUP MNT QC MG01MM 8) 03744 OPS TRNG MGR. MG03OT 9) 03759 U S NUC REG WASHINGTON, DC 10) 03796 SCIENTECH CLEARWTR, FL 11) 04698 D E BORTZ EC08G 12) 04809 MCG PLANT ENG. LIBR. MG05SE 13) 05262 J L FREEZE MG011E 14) 05606 J C MORTON MG01EP 15) 08103 WESTINGHOUSE ELECTRIC CO LLC Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS)TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION | ||
[] Yes | [] Yes | ||
* No OTHER ACKNOWLEDGEMENT REQUIRED E Yes IF OA OR OTHER ACKNOWLEDGEMENT REQUIRED. | * No OTHER ACKNOWLEDGEMENT REQUIRED E Yes IF OA OR OTHER ACKNOWLEDGEMENT REQUIRED. | ||
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PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal | PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal | ||
#: DUK1123310066 1)2)3)4)5)6)7)8)9)10)11)12)13)14)15)00003 NRI&IA MGR ECO50 00070 VICKIE BREWER- MG030T 00200 M E CARROLL ECO8H -00297 V M MCCREE REG ATL, GA 00422 MCG BONNIE C BEAVER -MG01RC 00485 OPS TEST GROUP -MG010P 00568 MCG RAD PROT MG01 RP 00707 SERV BLDG FILE ROOM -MG01S1 00841 OPS HUMAN PERFORMANCE | #: DUK1123310066 1)2)3)4)5)6)7)8)9)10)11)12)13)14)15)00003 NRI&IA MGR ECO50 00070 VICKIE BREWER- MG030T 00200 M E CARROLL ECO8H -00297 V M MCCREE REG ATL, GA 00422 MCG BONNIE C BEAVER -MG01RC 00485 OPS TEST GROUP -MG010P 00568 MCG RAD PROT MG01 RP 00707 SERV BLDG FILE ROOM -MG01S1 00841 OPS HUMAN PERFORMANCE | ||
-MG010P 01202 K L CRANE -MG01RC 01492 BLUE DOT LIBRARY MG02MO 01503 VICKIE L MC GINNIS -MG030T 01545 TERESA B PUTNAM MG01OP 01623 G L MONTGOMERY MG01WC 01749 L C GIBBY -MG01VP Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS) " TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION | -MG010P 01202 K L CRANE -MG01RC 01492 BLUE DOT LIBRARY MG02MO 01503 VICKIE L MC GINNIS -MG030T 01545 TERESA B PUTNAM MG01OP 01623 G L MONTGOMERY MG01WC 01749 L C GIBBY -MG01VP Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS) " TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION | ||
[ Yes | [ Yes | ||
* No OTHER ACKNOWLEDGEMENT REQUIRED | * No OTHER ACKNOWLEDGEMENT REQUIRED | ||
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If a logic matrix combination is completed, the system will initiate a reactor trip or send actuation signals via master and slave relays to those components whose aggregate Function best serves to alleviate the condition and restore the unit to a stable condition. | If a logic matrix combination is completed, the system will initiate a reactor trip or send actuation signals via master and slave relays to those components whose aggregate Function best serves to alleviate the condition and restore the unit to a stable condition. | ||
Examples are given in the Applicable Safety Analyses, LCO, and Applicability sections of this Bases.Reactor Trip Switchcqear The RTBs are in the electrical power supply line from the control rod drive motor generator set power supply to the CRDMs. Opening of the RTBs interrupts power to the CRDMs, which allows the shutdown rods and control rods to fall into the core by gravity. Each RTB is equipped with a bypass breaker to allow testing of the RTB while the unit is at power.During normal operation the output from the SSPS is a voltage signal that energizes the undervoltage coils in the RTBs and bypass breakers, if in use. When the required logic matrix combination is completed, the SSPS output voltage signal is removed, the undervoltage coils are de-energized, the breaker trip lever is actuated by a compressed spring that is released by de-energizing the undervoltage coil, and the RTBs and bypass breakers are tripped open. This allows the shutdown rods and control rods to fall into the core. In addition to the de-energization of the McGuire Units 1 and 2 B 3.3.1-5 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued) undervoltage coils, each breaker is also equipped with a shunt trip device that is energized to trip the breaker open upon receipt of a reactor trip signal from the SSPS. Either the undervoltage coil or the shunt trip mechanism is sufficient by itself, thus providing a diverse trip mechanism. | Examples are given in the Applicable Safety Analyses, LCO, and Applicability sections of this Bases.Reactor Trip Switchcqear The RTBs are in the electrical power supply line from the control rod drive motor generator set power supply to the CRDMs. Opening of the RTBs interrupts power to the CRDMs, which allows the shutdown rods and control rods to fall into the core by gravity. Each RTB is equipped with a bypass breaker to allow testing of the RTB while the unit is at power.During normal operation the output from the SSPS is a voltage signal that energizes the undervoltage coils in the RTBs and bypass breakers, if in use. When the required logic matrix combination is completed, the SSPS output voltage signal is removed, the undervoltage coils are de-energized, the breaker trip lever is actuated by a compressed spring that is released by de-energizing the undervoltage coil, and the RTBs and bypass breakers are tripped open. This allows the shutdown rods and control rods to fall into the core. In addition to the de-energization of the McGuire Units 1 and 2 B 3.3.1-5 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued) undervoltage coils, each breaker is also equipped with a shunt trip device that is energized to trip the breaker open upon receipt of a reactor trip signal from the SSPS. Either the undervoltage coil or the shunt trip mechanism is sufficient by itself, thus providing a diverse trip mechanism. | ||
The decision logic matrix Functions are described in the functional diagrams included in Reference | The decision logic matrix Functions are described in the functional diagrams included in Reference | ||
: 1. In addition to the reactor trip or ESF, these diagrams also describe the various "permissive interlocks" that are associated with unit conditions. | : 1. In addition to the reactor trip or ESF, these diagrams also describe the various "permissive interlocks" that are associated with unit conditions. | ||
Each train has a built in testing device that can test the decision logic matrix Functions and the actuation devices while the unit is at power. When any one train is taken out of service for testing, the other train is capable of providing unit monitoring and protection until the testing has been completed. | Each train has a built in testing device that can test the decision logic matrix Functions and the actuation devices while the unit is at power. When any one train is taken out of service for testing, the other train is capable of providing unit monitoring and protection until the testing has been completed. | ||
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: 18. Reactor Trip Breaker Undervoltaqe and Shunt Trip Mechanisms The LCO requires both the Undervoltage and Shunt Trip Mechanisms to be OPERABLE for each RTB that is in service. The trip mechanisms are not required to be OPERABLE for trip breakers that are open, racked out, incapable of supplying power to the CRD System, or declared inoperable under Function 17 above.OPERABILITY of both trip mechanisms on each breaker ensures that no single trip mechanism failure will prevent opening any breaker on a valid signal.These trip Functions must be OPERABLE in MODE 1 or 2 when the reactor is critical. | : 18. Reactor Trip Breaker Undervoltaqe and Shunt Trip Mechanisms The LCO requires both the Undervoltage and Shunt Trip Mechanisms to be OPERABLE for each RTB that is in service. The trip mechanisms are not required to be OPERABLE for trip breakers that are open, racked out, incapable of supplying power to the CRD System, or declared inoperable under Function 17 above.OPERABILITY of both trip mechanisms on each breaker ensures that no single trip mechanism failure will prevent opening any breaker on a valid signal.These trip Functions must be OPERABLE in MODE 1 or 2 when the reactor is critical. | ||
In MODE 3, 4, or 5, these RTS trip Functions must be OPERABLE when the RTBs or associated bypass breakers are closed, and the CRD System is capable of rod withdrawal. | In MODE 3, 4, or 5, these RTS trip Functions must be OPERABLE when the RTBs or associated bypass breakers are closed, and the CRD System is capable of rod withdrawal. | ||
: 19. Automatic Trip Logqic The LCO requirement for the RTBs (Functions 17 and 18) and Automatic Trip Logic (Function | : 19. Automatic Trip Logqic The LCO requirement for the RTBs (Functions 17 and 18) and Automatic Trip Logic (Function | ||
: 19) ensures that means are provided to interrupt the power to allow the rods to fall into the reactor core. Each RTB is equipped with an undervoltage coil and a shunt trip coil to trip the breaker open when needed. Each train RTB has a bypass breaker to allow testing of the trip breaker while the unit is at power. The reactor trip signals generated by the RTS Automatic Trip Logic cause the RTBs and associated bypass breakers to open and shut down the reactor.The LCO requires two trains of RTS Automatic Trip Logic to be OPERABLE. | : 19) ensures that means are provided to interrupt the power to allow the rods to fall into the reactor core. Each RTB is equipped with an undervoltage coil and a shunt trip coil to trip the breaker open when needed. Each train RTB has a bypass breaker to allow testing of the trip breaker while the unit is at power. The reactor trip signals generated by the RTS Automatic Trip Logic cause the RTBs and associated bypass breakers to open and shut down the reactor.The LCO requires two trains of RTS Automatic Trip Logic to be OPERABLE. | ||
Having two OPERABLE channels ensures that random failure of a single logic channel will not prevent reactor trip.McGuire Units 1 and 2 B 3.3.1-33 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO,.and APPLICABILITY (continued) | Having two OPERABLE channels ensures that random failure of a single logic channel will not prevent reactor trip.McGuire Units 1 and 2 B 3.3.1-33 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO,.and APPLICABILITY (continued) | ||
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Pressurizer Pressure-Low; Pressurizer Water Level-High; Reactor Coolant Flow-Low (Two Loops);Undervoltage RCPs; and Underfrequency RCPs.With one channel inoperable, the inoperable channel must be placed in the tripped condition within 72 hours. Placing the channel in the tripped condition results in a partial trip condition requiring only one additional channel to initiate a reactor trip above the P-7 setpoint (and below the P-8 setpoint for the Reactor Coolant Flow-Low (Two Loops) Function). | Pressurizer Pressure-Low; Pressurizer Water Level-High; Reactor Coolant Flow-Low (Two Loops);Undervoltage RCPs; and Underfrequency RCPs.With one channel inoperable, the inoperable channel must be placed in the tripped condition within 72 hours. Placing the channel in the tripped condition results in a partial trip condition requiring only one additional channel to initiate a reactor trip above the P-7 setpoint (and below the P-8 setpoint for the Reactor Coolant Flow-Low (Two Loops) Function). | ||
These Functions do not have to be OPERABLE below the P-7 setpoint because, for the Pressurizer Water Level-High function, transients are slow enough for manual action; and for the other functions, power distributions that would cause a DNB concern at this low power level are unlikely. | These Functions do not have to be OPERABLE below the P-7 setpoint because, for the Pressurizer Water Level-High function, transients are slow enough for manual action; and for the other functions, power distributions that would cause a DNB concern at this low power level are unlikely. | ||
The 72 hours allowed to place the channel in the tripped condition is justified in Reference | The 72 hours allowed to place the channel in the tripped condition is justified in Reference | ||
: 10. An additional 6 hours is allowed to reduce THERMAL POWER to below P-7 if the inoperable channel cannot be restored to OPERABLE status or placed in trip within the specified Completion Time.Allowance of this time interval takes into consideration the redundant capability provided by the remaining redundant OPERABLE channel, and the low probability of occurrence of an event during this period that may require the protection afforded by the Functions associated with Condition M.McGuire Units 1 and 2 B 3.3.1-41 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued) | : 10. An additional 6 hours is allowed to reduce THERMAL POWER to below P-7 if the inoperable channel cannot be restored to OPERABLE status or placed in trip within the specified Completion Time.Allowance of this time interval takes into consideration the redundant capability provided by the remaining redundant OPERABLE channel, and the low probability of occurrence of an event during this period that may require the protection afforded by the Functions associated with Condition M.McGuire Units 1 and 2 B 3.3.1-41 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued) | ||
The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up to 12 hours while performing routine surveillance testing of the other channels. | The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up to 12 hours while performing routine surveillance testing of the other channels. | ||
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The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour time limit is justified in Reference 10.Q.1 and Q.2 Condition Q applies to the SI Input from ESFAS reactor trip and the RTS Automatic Trip Logic in MODES 1 and 2. These actions address the train orientation of the RTS for these Functions. | The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour time limit is justified in Reference 10.Q.1 and Q.2 Condition Q applies to the SI Input from ESFAS reactor trip and the RTS Automatic Trip Logic in MODES 1 and 2. These actions address the train orientation of the RTS for these Functions. | ||
With one train inoperable, 24 hours are allowed to restore the train to OPERABLE status (Required Action Q. 1) or the unit must be placed in MODE 3 within the next 6 hours.The Completion Time of 24 hours (Required Action Q.1) is reasonable considering that in this Condition, the remaining OPERABLE train is adequate to perform the safety function and given the low probability of an event during this interval. | With one train inoperable, 24 hours are allowed to restore the train to OPERABLE status (Required Action Q. 1) or the unit must be placed in MODE 3 within the next 6 hours.The Completion Time of 24 hours (Required Action Q.1) is reasonable considering that in this Condition, the remaining OPERABLE train is adequate to perform the safety function and given the low probability of an event during this interval. | ||
The 24 hours allowed to restore the inoperable RTS Automatic Trip Logic train to OPERABLE status is justified in Reference | The 24 hours allowed to restore the inoperable RTS Automatic Trip Logic train to OPERABLE status is justified in Reference | ||
: 10. The additional Completion Time of 6 hours (Required Action Q.2) is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems.The Required Actions have been modified by a Note that allows bypassing one train up to 4 hours for surveillance testing, provided the other train is OPERABLE. | : 10. The additional Completion Time of 6 hours (Required Action Q.2) is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems.The Required Actions have been modified by a Note that allows bypassing one train up to 4 hours for surveillance testing, provided the other train is OPERABLE. | ||
The 4 hour time limit for testing the RTS Automatic Trip Logic train may include testing the RTB also, if both the -Logic test and RTB test are conducted within the 4 hour time limit. The 4 hour time limit is justified in Reference 10.R.1 and R.2 Condition R applies to the RTBs in MODES 1 and 2. These actions address the train orientation of the RTS for the RTBs. With one train inoperable, 24 hours is allowed for train corrective maintenance to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the next 6 hours. The 24 hour Completion Time is justified in Reference | The 4 hour time limit for testing the RTS Automatic Trip Logic train may include testing the RTB also, if both the -Logic test and RTB test are conducted within the 4 hour time limit. The 4 hour time limit is justified in Reference 10.R.1 and R.2 Condition R applies to the RTBs in MODES 1 and 2. These actions address the train orientation of the RTS for the RTBs. With one train inoperable, 24 hours is allowed for train corrective maintenance to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the next 6 hours. The 24 hour Completion Time is justified in Reference | ||
: 11. The Completion Time of 6 hours is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems. Placing the unit in MODE 3 removes the requirement for this particular Function.McGuire Units 1 and 2 B 3.3.1-43 Revision No. 124 RTS Instrumentation' B 3.3.1 BASES ACTIONS (continued) | : 11. The Completion Time of 6 hours is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems. Placing the unit in MODE 3 removes the requirement for this particular Function.McGuire Units 1 and 2 B 3.3.1-43 Revision No. 124 RTS Instrumentation' B 3.3.1 BASES ACTIONS (continued) | ||
The Required Actions have been modified by a Note.. The Note allows one RTB to be bypassed for up to 4 hours for surveillance testing, provided the other RTB is OPERABLE. | The Required Actions have been modified by a Note.. The Note allows one RTB to be bypassed for up to 4 hours for surveillance testing, provided the other RTB is OPERABLE. | ||
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SR 3.3.1.7 is modified by a Note that provides a 4 hour delay in the requirement to perform this Surveillance for source range instrumentation when entering MODE 3 from MODE 2. This Note allows a normal shutdown to proceed without a delay for testing in MODE 2 and for a short time in MODE 3 until the RTBs are open and SR 3.3.1.7 is no longer required to be performed. | SR 3.3.1.7 is modified by a Note that provides a 4 hour delay in the requirement to perform this Surveillance for source range instrumentation when entering MODE 3 from MODE 2. This Note allows a normal shutdown to proceed without a delay for testing in MODE 2 and for a short time in MODE 3 until the RTBs are open and SR 3.3.1.7 is no longer required to be performed. | ||
If the unit is to be in MODE 3 with the RTBs closed for > 4 hours this Surveillance must be completed within 4 hours after entry into MODE 3. The surveillance shall include verification of the high flux at shutdown alarm setpoint of less than or equal to the average CPS Neutron Level reading (most consistent value between highest and lowest CPS Neutron Level reading) at five times background. | If the unit is to be in MODE 3 with the RTBs closed for > 4 hours this Surveillance must be completed within 4 hours after entry into MODE 3. The surveillance shall include verification of the high flux at shutdown alarm setpoint of less than or equal to the average CPS Neutron Level reading (most consistent value between highest and lowest CPS Neutron Level reading) at five times background. | ||
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | ||
: 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will, continue to behave in accordance with safety analysis assumptions and McGuire Units I and 2 B 3.3.1-49 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) the channel performance assumptions in the setpoint methodology. | : 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will, continue to behave in accordance with safety analysis assumptions and McGuire Units I and 2 B 3.3.1-49 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) the channel performance assumptions in the setpoint methodology. | ||
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program.will ensure required review and documentation of the condition for continued OPERABILITY. | The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program.will ensure required review and documentation of the condition for continued OPERABILITY. | ||
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If power is to be maintained | If power is to be maintained | ||
< P-10 or < P-6 for more than 4 hours, then the testing required by this surveillance must be performed prior to the expiration of the 4 hour limit. Four hours is a reasonable time to complete the required testing or place the unit in a MODE where this surveillance is no longer required. | < P-10 or < P-6 for more than 4 hours, then the testing required by this surveillance must be performed prior to the expiration of the 4 hour limit. Four hours is a reasonable time to complete the required testing or place the unit in a MODE where this surveillance is no longer required. | ||
This test ensures that the NIS source, intermediate, and power range low channels are OPERABLE prior to taking the reactor critical and after reducing power into the applicable MODE (< P-10 or < P-6) for periods > 4 hours. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | This test ensures that the NIS source, intermediate, and power range low channels are OPERABLE prior to taking the reactor critical and after reducing power into the applicable MODE (< P-10 or < P-6) for periods > 4 hours. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | ||
: 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology. | : 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology. | ||
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition for continued OPERABILITY. | The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition for continued OPERABILITY. | ||
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This analysis process monitors the actual number and amplitude of the Neutron/Gamma pulses being generated by the SR detector. | This analysis process monitors the actual number and amplitude of the Neutron/Gamma pulses being generated by the SR detector. | ||
The high voltage is adjusted to optimize the amplitude of the pulses while maintaining as low as possible high voltage value in order to prolong the detector life. The discriminator voltage is then adjusted, as required, to reasonably ensure that the neutron pulses are being counted by the source range instrumentation and the unwanted gamma pulses are not being counted as neutron pulses.The CHANNEL CALIBRATION for the compensated ion chamber intermediate range neutron detectors consists of the high voltage detector plateau for intermediate range, evaluating those curves, and comparing the curves to the manufacturer's data. The CHANNEL CALIBRATION for the fission chamber source and intermediate range neutron detectors consists of verifying that the channels respond correctly to test inputs with the necessary range and accuracy.Note 2 states that this Surveillance is not required for the NIS power range detectors for entry into MODE 2 or 1. Note 3 applies to the compensated ion chamber intermediate range neutron detectors, and states that this Surveillance is not required to be performed for entry into MODE 2 or 1. Notes 2 and 3 are required because the unit must be in at least MODE 2 to perform the test for the compensated ion chamber intermediate range detectors and MODE 1 for the power range detectors. | The high voltage is adjusted to optimize the amplitude of the pulses while maintaining as low as possible high voltage value in order to prolong the detector life. The discriminator voltage is then adjusted, as required, to reasonably ensure that the neutron pulses are being counted by the source range instrumentation and the unwanted gamma pulses are not being counted as neutron pulses.The CHANNEL CALIBRATION for the compensated ion chamber intermediate range neutron detectors consists of the high voltage detector plateau for intermediate range, evaluating those curves, and comparing the curves to the manufacturer's data. The CHANNEL CALIBRATION for the fission chamber source and intermediate range neutron detectors consists of verifying that the channels respond correctly to test inputs with the necessary range and accuracy.Note 2 states that this Surveillance is not required for the NIS power range detectors for entry into MODE 2 or 1. Note 3 applies to the compensated ion chamber intermediate range neutron detectors, and states that this Surveillance is not required to be performed for entry into MODE 2 or 1. Notes 2 and 3 are required because the unit must be in at least MODE 2 to perform the test for the compensated ion chamber intermediate range detectors and MODE 1 for the power range detectors. | ||
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference | ||
: 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.McGuire Units 1 and 2 B 3.3.1-53 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) | : 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.McGuire Units 1 and 2 B 3.3.1-53 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) | ||
Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology. | Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology. | ||
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The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Units 1 and 2 B 3.3.1-56 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Units 1 and 2 B 3.3.1-56 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) | ||
SR 3.3.1.16 is modified by a Note stating that neutron detectors are excluded from RTS RESPONSE TIME testing. This Note is necessary because of the difficulty in generating an appropriate detector input signal. Excluding the detectors is acceptable because the principles of detector operation ensure a virtually instantaneous response. | SR 3.3.1.16 is modified by a Note stating that neutron detectors are excluded from RTS RESPONSE TIME testing. This Note is necessary because of the difficulty in generating an appropriate detector input signal. Excluding the detectors is acceptable because the principles of detector operation ensure a virtually instantaneous response. | ||
The response time of the neutron flux signal portion of the channel shall be measured from detector output or input of the first electronic component in the channel.REFERENCES | The response time of the neutron flux signal portion of the channel shall be measured from detector output or input of the first electronic component in the channel.REFERENCES | ||
: 1. UFSAR, Chapter 7.2. UFSAR, Chapter 6.3. UFSAR, Chapter 15.4. IEEE-279-1971. | : 1. UFSAR, Chapter 7.2. UFSAR, Chapter 6.3. UFSAR, Chapter 15.4. IEEE-279-1971. | ||
: 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | : 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | ||
| Line 734: | Line 734: | ||
C.1, C.2.1 and C.2.2 Condition C applies to the automatic actuation logic and actuation relays for the following functions: | C.1, C.2.1 and C.2.2 Condition C applies to the automatic actuation logic and actuation relays for the following functions: | ||
SI;Phase A Isolation; and Phase B Isolation. | SI;Phase A Isolation; and Phase B Isolation. | ||
This action addresses the train orientation of the SSPS and the master and slave relays. If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | This action addresses the train orientation of the SSPS and the master and slave relays. If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | ||
: 10. The specified Completion Time is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | : 10. The specified Completion Time is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | ||
If the train cannot be restored to OPERABLE status, the unit must be placed in a MODE in which the LCO does not apply. This is done by placing the unit in at least MODE 3 within an additional 6 hours (30 hours total time) and in MODE 5 within an additional 30 hours (60 hours total time). The Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.The Required Actions are modified by a Note that allows one train to be bypassed for up to 4 hours for surveillance testing, provided the other train is OPERABLE. | If the train cannot be restored to OPERABLE status, the unit must be placed in a MODE in which the LCO does not apply. This is done by placing the unit in at least MODE 3 within an additional 6 hours (30 hours total time) and in MODE 5 within an additional 30 hours (60 hours total time). The Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.The Required Actions are modified by a Note that allows one train to be bypassed for up to 4 hours for surveillance testing, provided the other train is OPERABLE. | ||
| Line 761: | Line 761: | ||
This action addresses the operability of the manual steam line isolation function for each individual main steam isolation valve. If a channel is inoperable, 48 hours is allowed to return it to an OPERABLE status. If the train cannot be restored to OPERABLE status, the Conditions and Required Actions of LCO 3.7.2, "Main Steam Isolation Valves," must be entered for the associated inoperable valve. The specified Completion Time is reasonable considering that there is a system level manual initiation train for this Function and the low probability of an event occurring during this interval.H.1, H.2.1 and H.2.2 Condition H applies to the automatic actuation logic and actuation relays for the Steam Line Isolation, Feedwater Isolation, and AFW actuation Functions. | This action addresses the operability of the manual steam line isolation function for each individual main steam isolation valve. If a channel is inoperable, 48 hours is allowed to return it to an OPERABLE status. If the train cannot be restored to OPERABLE status, the Conditions and Required Actions of LCO 3.7.2, "Main Steam Isolation Valves," must be entered for the associated inoperable valve. The specified Completion Time is reasonable considering that there is a system level manual initiation train for this Function and the low probability of an event occurring during this interval.H.1, H.2.1 and H.2.2 Condition H applies to the automatic actuation logic and actuation relays for the Steam Line Isolation, Feedwater Isolation, and AFW actuation Functions. | ||
The action addresses the train orientation of the SSPS and the master and slave relays for these functions. | The action addresses the train orientation of the SSPS and the master and slave relays for these functions. | ||
If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | ||
: 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | : 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | ||
If the train cannot be returned to OPERABLE status, the unit must be brought to MODE 3 within the next 6 hours and MODE 4 within the following 6 hours. The allowed Completion Times are reasonable,' | If the train cannot be returned to OPERABLE status, the unit must be brought to MODE 3 within the next 6 hours and MODE 4 within the following 6 hours. The allowed Completion Times are reasonable,' | ||
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An SSPS train is not inoperable due to an individual SSPS slave relay or slave relay contact being incapable of actuating. | An SSPS train is not inoperable due to an individual SSPS slave relay or slave relay contact being incapable of actuating. | ||
1.1 and 1.2 Condition I applies to the automatic actuation logic and actuation relays for the Turbine Trip Function.This action addresses the train orientation of the SSPS and the master and slave relays for this Function. | 1.1 and 1.2 Condition I applies to the automatic actuation logic and actuation relays for the Turbine Trip Function.This action addresses the train orientation of the SSPS and the master and slave relays for this Function. | ||
If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the following 6 hours. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | If one train is inoperable, 24 hours are allowed to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the following 6 hours. The 24 hours allowed for restoring the inoperable train to OPERABLE status is justified in Reference | ||
: 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | : 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval. | ||
The allowed Completion Time of 6 hours is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit systems. These Functions are no longer required in MODE 3. Placing the unit in MODE 3 removes all requirements for OPERABILITY of the protection channels and actuation functions. | The allowed Completion Time of 6 hours is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit systems. These Functions are no longer required in MODE 3. Placing the unit in MODE 3 removes all requirements for OPERABILITY of the protection channels and actuation functions. | ||
| Line 825: | Line 825: | ||
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable. | If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable. | ||
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR.SR 3.3.2.4 SR 3.3.2.4 is the performance of a MASTER RELAY TEST. The MASTER RELAY TEST is the energizing of the master relay, verifying contact operation and a low voltage continuity check of the slave relay coil. Upon master relay contact operation, a low voltage is injected to the slave relay coil. This voltage is insufficient to pick up the slave relay, but large enough to demonstrate signal path continuity. | The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR.SR 3.3.2.4 SR 3.3.2.4 is the performance of a MASTER RELAY TEST. The MASTER RELAY TEST is the energizing of the master relay, verifying contact operation and a low voltage continuity check of the slave relay coil. Upon master relay contact operation, a low voltage is injected to the slave relay coil. This voltage is insufficient to pick up the slave relay, but large enough to demonstrate signal path continuity. | ||
The time allowed for the testing (4 hours) is justified in Reference | The time allowed for the testing (4 hours) is justified in Reference | ||
: 7. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Unit 1 and 2 B 3.3.2-39 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCEREQUIREMENTS (continued) | : 7. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Unit 1 and 2 B 3.3.2-39 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCEREQUIREMENTS (continued) | ||
SR 3.3.2.5 SR 3.3.2.5 is the performance of a COT.A COT is performed on each required channel to ensure the channel will perform the intended Function. | SR 3.3.2.5 SR 3.3.2.5 is the performance of a COT.A COT is performed on each required channel to ensure the channel will perform the intended Function. | ||
| Line 848: | Line 848: | ||
For channels that include dynamic transfer functions (e.g., lag, lead/lag, rate/lag, etc.), the response time test may be performed with the transfer functions set to one with the resulting measured response time compared to the appropriate UFSAR response time. Alternately, the response time test can be performed with the time constants set to their nominal value provided the required response time is analytically calculated assuming the time constants are set at their nominal values. The response time may be measured by a series of overlapping tests such that the entire response time is measured.Response time may be verified by actual response time tests in any series of sequential, overlapping or total channel measurements, or by the summation of allocated sensor, signal processing and actuation logic response times with actual response time tests on the remainder of the channel. Allocations for sensor response times may be obtained from: (1) historical records based on acceptable response time tests (hydraulic, noise, or power interrupt tests), (2)in place, onsite, or offsite (e.g., vendor) test measurements, or (3) utilizing vendor engineering specifications. | For channels that include dynamic transfer functions (e.g., lag, lead/lag, rate/lag, etc.), the response time test may be performed with the transfer functions set to one with the resulting measured response time compared to the appropriate UFSAR response time. Alternately, the response time test can be performed with the time constants set to their nominal value provided the required response time is analytically calculated assuming the time constants are set at their nominal values. The response time may be measured by a series of overlapping tests such that the entire response time is measured.Response time may be verified by actual response time tests in any series of sequential, overlapping or total channel measurements, or by the summation of allocated sensor, signal processing and actuation logic response times with actual response time tests on the remainder of the channel. Allocations for sensor response times may be obtained from: (1) historical records based on acceptable response time tests (hydraulic, noise, or power interrupt tests), (2)in place, onsite, or offsite (e.g., vendor) test measurements, or (3) utilizing vendor engineering specifications. | ||
WCAP-13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" provides the basis and methodology for using allocated sensor response times in the overall verification of the channel response time for specific sensors identified in the WCAP. Response time verification for other sensor types must be either demonstrated by test or their equivalency to those listed in WCAP-13632-P-A, Revision 2. Any demonstration of equivalency must have been determined to be acceptable by NRC staff review.WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests' provides the basis and methodology for using allocated signal processing and actuation logic response times in the overall verification McGuire Unit 1 and 2 B 3.3.2-42 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued) of the protection system channel response time. The allocations for sensor, signal conditioning, and actuation logic response times must be verified prior to placing the component in operational service and re-verified following maintenance that may adversely affect response time. In general, electrical repair work does not impact response time provided the parts used for repair are of the same type and value. Specific components identified in the WCAP may be replaced without verification testing. One example where response time could be affected is replacing the sensing assembly of a transmitter. | WCAP-13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" provides the basis and methodology for using allocated sensor response times in the overall verification of the channel response time for specific sensors identified in the WCAP. Response time verification for other sensor types must be either demonstrated by test or their equivalency to those listed in WCAP-13632-P-A, Revision 2. Any demonstration of equivalency must have been determined to be acceptable by NRC staff review.WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests' provides the basis and methodology for using allocated signal processing and actuation logic response times in the overall verification McGuire Unit 1 and 2 B 3.3.2-42 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued) of the protection system channel response time. The allocations for sensor, signal conditioning, and actuation logic response times must be verified prior to placing the component in operational service and re-verified following maintenance that may adversely affect response time. In general, electrical repair work does not impact response time provided the parts used for repair are of the same type and value. Specific components identified in the WCAP may be replaced without verification testing. One example where response time could be affected is replacing the sensing assembly of a transmitter. | ||
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.This SR is modified by a Note that clarifies that the turbine driven AFW pump is tested within 24 hours after reaching 900 psig in the SGs.REFERENCES | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.This SR is modified by a Note that clarifies that the turbine driven AFW pump is tested within 24 hours after reaching 900 psig in the SGs.REFERENCES | ||
: 1. UFSAR, Chapter 6.2. UFSAR, Chapter 7.3. UFSAR, Chapter 15.4. IEEE-279-1971. | : 1. UFSAR, Chapter 6.2. UFSAR, Chapter 7.3. UFSAR, Chapter 15.4. IEEE-279-1971. | ||
: 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | : 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | ||
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The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.3.2 Not Used SR 3.3.3.3 CHANNEL CALIBRATION is a complete check of the instrument loop, including the sensor. The test verifies that the channel responds to measured parameter with the necessary range and accuracy. | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.3.2 Not Used SR 3.3.3.3 CHANNEL CALIBRATION is a complete check of the instrument loop, including the sensor. The test verifies that the channel responds to measured parameter with the necessary range and accuracy. | ||
This SR is modified by a Note that excludes neutron detectors. | This SR is modified by a Note that excludes neutron detectors. | ||
The calibration method for neutron detectors is specified in the Bases of LCO 3.3.1,"Reactor Trip System (RTS) Instrumentation." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES | The calibration method for neutron detectors is specified in the Bases of LCO 3.3.1,"Reactor Trip System (RTS) Instrumentation." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES | ||
: 1. UFSAR Section 1.8.2. Regulatory Guide 1.97, Rev. 2.3. NUREG-0737, Supplement 1, "TMI Action Items." 4. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | : 1. UFSAR Section 1.8.2. Regulatory Guide 1.97, Rev. 2.3. NUREG-0737, Supplement 1, "TMI Action Items." 4. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | ||
McGuire Unit 1 and 2 B 3.3.3-15 Revision No. 122 RWST B 3.5.4 B 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)B 3.5.4 Refueling Water Storage Tank (RWST)BASES BACKGROUND The RWST supplies borated water to the Chemical and Volume Control System (CVCS) during abnormal operating conditions, to the refueling pool during refueling and makeup operations, and to the ECCS during accident conditions. | McGuire Unit 1 and 2 B 3.3.3-15 Revision No. 122 RWST B 3.5.4 B 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)B 3.5.4 Refueling Water Storage Tank (RWST)BASES BACKGROUND The RWST supplies borated water to the Chemical and Volume Control System (CVCS) during abnormal operating conditions, to the refueling pool during refueling and makeup operations, and to the ECCS during accident conditions. | ||
| Line 1,027: | Line 1,027: | ||
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.3 Verifying the OPERABILITY of the return air damper provides assurance that the proper flow path will exist when the fan is started. This surveillance also tests the circuitry, including time delays, to ensure the system operates properly. | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.3 Verifying the OPERABILITY of the return air damper provides assurance that the proper flow path will exist when the fan is started. This surveillance also tests the circuitry, including time delays, to ensure the system operates properly. | ||
The Surveillance Frequency is based on McGuire Unit 1 and 2 B 3.6.11-4 Revision No. 122 ARS B 3.6.11 BASES SURVEILLANCE REQUIREMENTS (continued) operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.4 and SR 3.6.11.5 Verifying the OPERABILITY of the check damper in the air return fan discharge line to the containment lower compartment provides assurance that the proper flow path will exist when the fan is started and that reverse flow can not occur when the fan is not operating. | The Surveillance Frequency is based on McGuire Unit 1 and 2 B 3.6.11-4 Revision No. 122 ARS B 3.6.11 BASES SURVEILLANCE REQUIREMENTS (continued) operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.4 and SR 3.6.11.5 Verifying the OPERABILITY of the check damper in the air return fan discharge line to the containment lower compartment provides assurance that the proper flow path will exist when the fan is started and that reverse flow can not occur when the fan is not operating. | ||
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.6 and SR 3.6.11.7 These SRs require verification that each ARS motor operated damper opens or is prevented from opening and each ARS fan is allowed to start or is prevented from starting upon receipt of Containment Pressure Control System start permissive and terminate signals. The CPCS is described in the Bases for LCO 3.3.2, "ESFAS." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES | The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.6 and SR 3.6.11.7 These SRs require verification that each ARS motor operated damper opens or is prevented from opening and each ARS fan is allowed to start or is prevented from starting upon receipt of Containment Pressure Control System start permissive and terminate signals. The CPCS is described in the Bases for LCO 3.3.2, "ESFAS." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES | ||
: 1. UFSAR, Section 6.2.2. 10 CFR 50, Appendix K.3. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | : 1. UFSAR, Section 6.2.2. 10 CFR 50, Appendix K.3. 10 CFR 50.36, Technical Specifications, (c)(2)(ii). | ||
McGuire Unit 1 and 2 B 3.6.11-5 Revision No. 122 Diesel Fuel Oil and Starting Air B 3.8.3 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.3 Diesel Fuel Oil and Starting Air BASES BACKGROUND Each diesel generator (DG) is provided with a storage tank having a fuel oil capacity sufficient to operate that diesel for a period of 5 days while the DG is supplying maximum post loss of coolant accident load demand discussed in the UFSAR, Section 8.3.1.1.7 (Ref. 1). The maximum load demand is calculated using the assumption that a minimum of any two DGs is'available. | McGuire Unit 1 and 2 B 3.6.11-5 Revision No. 122 Diesel Fuel Oil and Starting Air B 3.8.3 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.3 Diesel Fuel Oil and Starting Air BASES BACKGROUND Each diesel generator (DG) is provided with a storage tank having a fuel oil capacity sufficient to operate that diesel for a period of 5 days while the DG is supplying maximum post loss of coolant accident load demand discussed in the UFSAR, Section 8.3.1.1.7 (Ref. 1). The maximum load demand is calculated using the assumption that a minimum of any two DGs is'available. | ||
Revision as of 01:13, 29 April 2019
| ML12340A518 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/26/2012 |
| From: | Beaver B C Duke Energy Carolinas |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML12340A518 (187) | |
Text
PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal
- DUK123310066
- 1) 01820 J R ELKINS- ECO81 2) 02388 BOB SCHOMAKER LYNCHBG, VA 3) 02532 RESIDENT NRC INSPECT MG01NRC 4) 02546WC LIBRARY -MG01WC 5) 03044 MCG DOC CNTRL MISC MAN MG05DM 6) 03614 MCG OPS PROCEDURE GP MG010P 7) 03743 MCG QA TEC SUP MNT QC MG01MM 8) 03744 OPS TRNG MGR. MG03OT 9) 03759 U S NUC REG WASHINGTON, DC 10) 03796 SCIENTECH CLEARWTR, FL 11) 04698 D E BORTZ EC08G 12) 04809 MCG PLANT ENG. LIBR. MG05SE 13) 05262 J L FREEZE MG011E 14) 05606 J C MORTON MG01EP 15) 08103 WESTINGHOUSE ELECTRIC CO LLC Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS)TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION
[] Yes
- No OTHER ACKNOWLEDGEMENT REQUIRED E Yes IF OA OR OTHER ACKNOWLEDGEMENT REQUIRED.
PLEASE ACKNOWLEDGE RECEIPT BY RETURNING THIS FORM TO: Duke Energy McGuire DCRM MGO2DM 13225 Hagers Ferry Road Huntersville, N.C. 28078 Rec'd By Page 2 of 3 Date DOCUMENT NO MEMO 1 PAGE UNIT #1 FOL UNIT #2 FOL TS LIST OF EFFECTIVE PAGES 11 PAGES TS 3.3.1-17 AMEND 268/248 1 PAGE TS 3.8.3-2 AMEND 267/247 1 PAGE TSB LIST OF EFFECTIVE SECTIONS TSB 3.3.1 ENTIRE SECTION TSB 3.3.2 TSB 3.3.3 TSB 3.5.4 TSB 3.6.6 TSB 3.6.11 TSB 3.8.3 ENTIRE SECTION REMARKS: PLEASE UPDATE ACCORDINGLY QA COND NA NA NA NA NA NA NA NA NA NA NA NA NA NA REV #/ DATE DISTR CODE 1 2 3 4 5 6 17 8 9 10 11 12 13 14 15 TOTAL V1 V1 31 10/29/12 10/29/12 10/29/12 094 10/29/12--- 10/29/12-- 10/29/12 113 10/29/12 124 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 123 10/29/12 MADM-04B V1 V1 V1 V1 x V1 IV1 V3 V1 V1 V1 V1 V1 S D CAPPS VICE PRESIDENT MCGUIRE NUCLEAR STATION BY: B C BEAVER MG01RC BCB/TLC 0>
PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW Date: 11/26/12 Document Transmittal
- DUK1123310066 1)2)3)4)5)6)7)8)9)10)11)12)13)14)15)00003 NRI&IA MGR ECO50 00070 VICKIE BREWER- MG030T 00200 M E CARROLL ECO8H -00297 V M MCCREE REG ATL, GA 00422 MCG BONNIE C BEAVER -MG01RC 00485 OPS TEST GROUP -MG010P 00568 MCG RAD PROT MG01 RP 00707 SERV BLDG FILE ROOM -MG01S1 00841 OPS HUMAN PERFORMANCE
-MG010P 01202 K L CRANE -MG01RC 01492 BLUE DOT LIBRARY MG02MO 01503 VICKIE L MC GINNIS -MG030T 01545 TERESA B PUTNAM MG01OP 01623 G L MONTGOMERY MG01WC 01749 L C GIBBY -MG01VP Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS) " TECHNICAL SPECIFICATIONS BASES (TSB)QA CONDITION
[ Yes
- No OTHER ACKNOWLEDGEMENT REQUIRED
- Yes IF QA OR OTHER ACKNOWLEDGEMENT REQUIRED, PLEASE ACKNOWLEDGE RECEIPT BY RETURNING THIS FORM TO: Duke Energy McGuire DCRM MGO2DM 13225 Hagers Ferry Road Huntersville, N.C. 28078 Rec'd By Date Page 1 of 3 DOCUMENT NO QA COND REV #/ DATE DISTR CODE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TOTAL MEMO 1 PAGIE UNIT #1 FOL UNIT #2 FOL TS LIST OF EFFECTIVE PAGES 11 PAGES TS 3.3.1-17 AMEND 268/248 1 PAGE TS 3.8.3-2 AMEND 267/247 1 PAGE TSB LIST OF EFFECTIVE SECTIONS TSB 3.3.1 ENTIRE SECTION TSB 3.3.2 TSB 3.3.3 TSB 3.5.4.TSB 3.6.6 TSB 3.6.11 TSB 3.8.3 ENTIRE SECTION NA NA NA NA NA NA NA NA NA NA NA NA., NA NA-10/29/12--- 10/29/12--- 10/29/12 094 10/29/12--- 10/29/12--- 10/29/12 113 10/29/12 124 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 123 10/29/12 MADM-04B V1 V1 vi vi T1 vi V1 vi V1 vi vi V1 V1'31 REMARKS: PLEASE UPDATE ACCORDINGLY S D CAPPS VICE PRESIDENT MCGUIRE NUCLEAR STATION BY: B C BEAVER MG01RC BCBITLC PRIORITY Normal DISPOSITION OF THE ORIGINAL DOCUMENT WILL BE TO THE TRANSMITTAL SIGNATURE UNLESS RECIPIENT IS OTHERWISE IDENTIFIED BELOW 1) 09665 JON H THOMPSON, USNRC Duke Energy DOCUMENT TRANSMITTAL FORM REFERENCE MCGUIRE NUCLEAR STATION TECHNICAL SPECIFICATIONS (TS)TECHNICAL SPECIFICATIONS BASES Date: 11/26/12 Document Transmittal
- DUK123310066 QA CONDITION D Yes
- No OTHER ACKNOWLEDGEMENT REQUIRED
- Yes IF QA OR OTHER ACKNOWLEDGEMENT REQUIRED, PLEASE ACKNOWLEDGE RECEIPT BY RETURNING THIS FORM TO: Duke Energy McGuire DCRM MGO2DM 13225 Hagers Ferry Road Huntersville, N.C. 28078 Rec'd By Date (TSB)Page 3 of 3 t , ____ ____ -, 4, -, ____ -____ ____ ____ 4 *i -I DOCUMENT NO QACOND REV #/ DATE DISTR CODE 1 2 3 4 5 6 7 8 9 10 11 12 13 114 115 TOTAL MEMO 1 PAGE UNIT #1 FOL UNIT #2 FOL TS LIST OF EFFECTIVE PAGES 11 PAGES TS 3.3.1-17 AMEND 268/248 1 PAGE TS 3.8.3-2 AMEND 267/247 1 PAGE TSB LIST OF EFFECTIVE SECTIONS TSB 3.3.1 ENTIRE SECTION TSB 3.3.2 TSB 3.3.3 TSB 3.5.4 TSB 3.6.6 TSB 3.6.11 TSB 3.8.3 ENTIRE SECTION NA NA NA NA NA NA NA NA NA NA NA NA NA NA-10/29/12--- 10/29/12--- 10/29/12 094 10/29/12-- 10/29/12--- 10/29/12 113 10/29/12 124 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 122 10/29/12 123 10/29/12 MADM-04B V1 31 REMARKS: PLEASE UPDATE ACCORDINGLY S D CAPPS.VICE PRESIDENT MCGUIRE NUCLEAR STATION BY: B C BEAVER MGO1RC BCB/TLC October 29, 2012 MEMORANDUM To: All McGuire Nuclear Station Technical Specification (TS) and Tech Spec Bases (TSB) Manual Holders
Subject:
McGuire TS and TSB Updates Attention:
Facility Operating License (FOL) Included Included in this distribution is an updated copy of the Unit 1 and Unit 2 FOL. Please place the updated copies in the front of your Technical Specification book. Please recycle your old copies. The FOL was updated to reflect Amendment 268/248.REMOVE INSERT TS Manual TS LOEP (Revision 93)TS 3.3.1-17 ,TS 3.8.3-2 TS LOEP (Revision 94)TS 3.3.1-17 Amendment 268/248 TS 3.8.3-2 Amendment 267/247 TS Bases Manual TSB LOES (Revision 112)TSB 3.3.1 (entire section)TSB 3.3.2 (Ul and U2 sections)TSB 3.3.3 (Ul and U2,sections)
TSB 3.5.4 (UI and U2 sections)TSB 3.6.6 (Ul and U2 sections)TSB 3.6.11 (Ul and U2 sections)TSB 3.8.3 (entire section) 'TSB LOES (Revision 113)TSB 3.3.1 (entire section) Rev 124 TSB 3.3.2 (UI and U2 combined document)
Rev 122 TSB 3.3.3 (UI and U2 combined document)
Rev 122 TSB 3.5.4 (UI and U2 combined document)
Rev 122 TSB 3.6.6 (UI and U2 combined document)
Rev 122 TSB 3.6.11 (UI and U2 combined document)
Rev 122 TSB 3.8.3 (entire section) Rev 123 If you have cover sheets before the following Sections, Please remove them: TSB 3.3.2 TSB 3.3.3 TSB 3.5.4 TSB 3.6.6 TSB 3.6.11 Revision numbers may skip numbers due to Regulatory Compliance Filing System.Please call me if you have questions.
Bonnie Beaver-Regulatory Compliance 875-4180 DUKE ENERGY CAROLINAS, LLC DOCKET NO. 50-369 MCGUIRE NUCLEAR STATION, UNIT 1 RENEWED FACILITY OPERATING LICENSE Renewed License No. NPF-9 1. The U.S. Nuclear Regulatory Commission (Commission), having previously made the findings set forth in License No. NPF-9 issued on June 12, 1981, has now found that: A. The application for renewed operating license filed by the Duke Energy Corporation*
complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's regulations set forth in 10 CFR Chapter I and all required notifications to other agencies or bodies have been duly made;B. Actions have been identified and have been or will be taken with respect to (1)managing the effects of aging during the period of extended operation on the functionality of structures and components that have been identified to require review under 10 CFR 54.21 (a)(1), and (2) time-limited aging analyses that have been identified to require review under 10 CFR 54.21 (c), such that there is reasonable assurance that the activities authorized by the renewed operating license will continue to be conducted in accordance with the current licensing basis, as defined in 10 CFR 54.3, for the McGuire Nuclear Station, Unit 1 (facility or plant), and that any changes made to the plant's current licensing basis in order to comply with 10 CFR 54.29(a) are in accord with the Act and the Commission's regulations; C. The facility will operate in conformity with the application, as amended, the provisions of the Act, and the regulations of the Commission; D. There is reasonable assurance: (i) that the activities authorized by this renewed operating license can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations set forth in 10 CFR Chapter I;E. The licensee is technically and financially qualified to engage in the activities authorized by this renewed operating license in accordance with the Commission's regulations set forth in 10 CFR Chapter I;Duke Energy Corporation converted to Duke Power Company LLC on April 3, 2006 and was re-named Duke Energy Carolinas, LLC as of October 1, 2006. Duke Energy Carolinas, LLC is the owner and operator of McGuire Nuclear Station, Unit 1. References to the "licensee" or "Duke" are to Duke Energy Carolinas, LLC.Renewed License No. NPF-9 Amendment No. 245 F. The licensee has satisfied the applicable provisions of 10 CFR Part 140,"Financial Protection Requirements and Indemnity Agreements," of the Commission's regulations; G. The issuance of this renewed operating license will not be inimical to the common defense and security or to the health and safety of the public;H. After weighing the environmental, economic, technical, and other benefits of the facility against environmental and other costs and considering available alternatives, the issuance of this Renewed Facility Operating License No. NFP-9 is in accordance with 10 CFR Part 51, of the Commission's regulations and all applicable requirements have been satisfied; and, 1. The receipt, possession, and use of source, byproduct and special nuclear material as authorized by this renewed operating license will be in accordance with the Commission's regulations in 10 CFR Parts 30, 40 and 70.2. Based on the foregoing findings, and pursuant to approval by the Nuclear Regulatory Commission at a meeting on June 9, 1981, the License for Fuel-Loading and Zero Power Testing issued on January 23, 1981, as amended, is superseded by Renewed Facility Operating License No. NPF-9 which is hereby issued to Duke Energy Carolinas, LLC to read as follows: A. This renewed operating license applies to the McGuire Nuclear Station, Unit 1, a pressurized water reactor and associated equipment (the facility) owned and operated by Duke Energy Carolinas, LLC. The facility is located on the licensee's site in Mecklenburg County, North Carolina, on the shore of Lake Norman approximately 17 miles northwest of Charlotte, North Carolina and is described in the Updated Final Safety Analysis Report, as supplemented and amended, and in the Environmental Report, as supplemented and amended.B. Subject to the conditions and requirements incorporated herein, the Commission hereby licenses Duke Energy Carolinas, LLC: (1) Pursuant to Section 103 of the Act and 10 CFR Part 50, to possess, use, and operate the facility at the designated location in Mecklenburg County, North Carolina, in accordance with the procedures and limitations set forth in the renewed operating license;(2) Pursuant to the Act and 10 CFR Part 70 to receive, possess and use at any time special nuclear material as reactor fuel, in accordance with the limitations for storage and amounts required for reactor operation, as described in the Updated Final Safety Analysis Report, as supplemented and amended;(3) Pursuant to the Act and. 10 CFR Parts 30, 40 and 70 to receive, possess and use at any time any byproduct, source and special nuclear material as sealed neutron sources for reactor startup, sealed sources for reactor instrumentation and radiation monitoring equipment calibration, and as fission detectors in amounts as required;Renewed License No. NPF-9 Amendment No. 245 (4) Pursuant to the Act and 10 CFR Parts 30, 40 and 70, to receive, possess and use in amounts as required any byproduct, source or special nuclear material without restriction to chemical or physical form, for sample analysis or instrument calibration or associated with radioactive apparatus or components; (5) Pursuant to the Act and 10 CFR Parts 30, 40 and 70, to possess, but not separate, such byproducts and special nuclear materials as may be produced by the operation of McGuire Nuclear Station, Units 1 and 2, and;(6) Pursuant to the Act and 10 CFR Parts 30 and 40, to receive, possess and process for release or transfer such byproduct material as may be produced by the Duke Training and Technology Center.C. This renewed operating license shall be deemed to contain and is subject to the conditions specified in the Commission's regulations set forth in 10 CFR Chapter I and is subject to all applicable provisions of the Act and to the rules, regulations, and orders of the Commission now or hereafter in effect; and is subject to the additional conditions specified or incorporated below: (1) Maximum Power Level The licensee is authorized to operate the facility at a reactor core full steady state power level of 3411 megawatts thermal (100%).(2) Technical Specifications The Technical Specifications contained in Appendix A, as revised through Amendment No. 268, are hereby incorporated into this renewed operating license. The licensee shall operate the facility in accordance with the Technical Specifications.
(3) Updated Final Safety Analysis Report The Updated Final Safety Analysis Report supplement submitted pursuant to 10 CFR 54.21(d), as revised on December 16, 2002, describes certain future activities to be completed before the period of extended operation.
Duke shall complete these activities no later than June 12, 2021, and shall notify the NRC in writing when implementation of these activities is complete and can be verified by NRC inspection.
The Updated Final Safety Analysis Report supplement as revised on December 16, 2002, described above, shall be included in the next scheduled update to the Updated Final Safety Analysis Report required by 10 CFR 50.71 (e)(4), following issuance of this renewed operating license.Until that update is complete, Duke may make changes to the programs described in such supplement without prior Commission approval, provided that Duke evaluates each such change pursuant to the criteria set forth in 10 CFR 50.59 and otherwise complies with the requirements in that section.Renewed License No. NPF-9 Amendment No. 268 (4) Fire Protection Program Duke Energy Carolinas, LLC shall implement and maintain in effect all provisions of the approved fire protection program as described in the Updated Final Safety Analysis Report for the facility and as approved in the SER dated March 1978 and Supplements 2, 5 and 6 dated March 1979, April 1981, and February 1983, respectively, and the safety evaluation dated May 15, 1989, subject to the following provision:
Duke may make changes to the approved fire protection program without prior approval of the Commission only if those changes would not adversely affect the ability to achieve and maintain safe shutdown in the event of a fire.(5) Additional Conditions The Additional Conditions contained in Appendix B, as revised through Amendment No. 200, are hereby incorporated into this renewed operating license. Duke Energy Carolinas, LLC shall operate the facility in accordance with the Additional Conditions.
(6) Antitrust Conditions The licensee shall comply with the antitrust conditions delineated in Appendix C of this renewed operating license.(7) Mitigation Strategy License Condition Develop and maintain strategies for addressing large fires and explosions and that include the following key areas: A) Fire fighting response strategy with the following elements: 1. Pre-defined coordinated fire response strategy and guidance 2. Assessment of mutual aid fire fighting assets 3. Designated staging areas for equipment and materials 4. Command and control 5. Training of response personnel B) Operations to mitigate fuel damage considering the following:
- 1. Protection and use of personnel assets 2. Communications
- 3. Minimizing fire spread 4. Procedures for implementing integrated fire response strategy 5. Identification of readily-available pre-staged equipment 6. Training on integrated fire response strategy 7. Spent fuel pool mitigation measures C) Actions to minimize release to include consideration of: 1. Water spray scrubbing 2. Dose to onsite responders Renewed License No. NPF-9 Amendment No. 264
-4A-D. Physical Protection Duke Energy Carolinas, LLC shall fully implement and maintain in effect all provisions of the Commission-approved physical security, training and qualification and safeguards contingency plans including amendments made pursuant to provisions of the Miscellaneous Amendments and Search Requirements revisions to 10 CFR 73.55 (51 FR 27817 and 27822) and to the authority of 10 CFR 50.90 and 10 CFR 50.54(p).
The combined set of plans, which contains safeguards information protected under 10 CFR 73.21, is entitled: "Duke Energy Physical Security Plan" submitted by letter dated September 8, 2004, and supplemented on September 30, 2004, October 15, 2004, October 21, 2004, and October 27, 2004.Duke Energy Carolinas, LLC shall fully implement and maintain in effect all provisions of the Commission-approved cyber security plan (CSP), including changes made pursuant to the authority of 10 CFR 50.90 and 10 CFR 50.54(p).The Duke Energy Carolinas, LLC CSP was approved by License Amendment No. 264.E. Deleted by Amendment No. 233.Renewed License No. NPF-9 Amendment No. 264 F. The licensee shall have and maintain financial protection of such type and in such amounts as the Commission shall require in accordance with Section 170 of the Atomic Energy Act of 1954, as amended, to cover public liability claims.G. The licensee is authorized to receive from the Oconee Nuclear Station, Units 1, 2, and 3, possess, and store irradiated Oconee fuel assemblies containing special nuclear material, enriched to not more than 3.24% by weight U-235 subject to the following conditions:
- a. Oconee fuel assemblies may not be placed in the McGuire Nuclear Station, Unit 1 and 2, reactors.b. Irradiated fuel shipped to McGuire Nuclear Station, Units 1 and 2, from Oconee shall have been removed from the Oconee reactor no less than 270 days prior to shipment.c. No more than 300 Oconee irradiated fuel assemblies shall be received for storage at McGuire Nuclear Station.d. Burnup of Oconee fuel shipped shall be no greater than 36,000 MW days per metric ton.e. Receipt of irradiated Oconee fuel shall be limited by the use of the NFS-4 (NAC-1), NLI-1/2, TN-8, or TN-8L spent fuel casks.f. The spent fuel pool crane travel shall be restricted by administrative controls to the paths required by Selected Licensee Commitment 16.9.20 whenever a spent fuel cask is being handled.g. Oconee fuel assemblies may not be transferred from one McGuire spent fuel pool to the other.3. This renewed operating license is effective as of the date of issuance and shall expire at midnight on June 12, 2041.FOR THE NUCLEAR REGULATORY COMMISSION J.E. Dyer, Director Office of Nuclear Reactor Regulation
Attachment:
- 1. Appendix A -Technical Specifications
- 2. Appendix B -Additional Conditions
- 3. Appendix C -Antitrust Conditions Date of Issuance:
December 5, 2003 Renewed License No. NPF-9 APPENDIX B ADDITIONAL CONDITIONS FACILITY OPERATING LICENSE NO. NPF-9 Duke Energy Carolinas, LLC shall comply with the following conditions on the schedules noted below: Amendment Additional Implementation Number Conditions Date 184 The schedule for the performance of new and Within 90 days of revised surveillance requirements shall be as the date of this follows: amendment.
For surveillance requirements (SRs) that are new in Amendment No. 184 the first performance is due at the end of the first surveillance interval that begins at implementation of Amendment No. 184. For SRs that existing prior to Amendment No. 184, including SRs with modified acceptance criteria and SRs whose intervals of performance are being extended, the first performance is due at the end of the first surveillance interval that begins on the date the surveillance was last performed prior to implementation of amendment No. 184. For SRs that existed prior to Amendment No. 184, whose intervals of performance are being reduced, the first reduced surveillance interval begins upon completion of the first surveillance performed after implementation of Amendment No. 184.Renewed License No. NPF-9 Amendment No. 258-B1 -
APPENDIX B ADDITIONAL CONDITIONS FACILITY OPERATING LICENSE NO. NPF-9 Duke Power Power Company LLC shall comply with the following conditions on the schedules noted below: Amendment Additional Implementation Number Conditions Date 249 Upon implementation of the Amendment adopting TSTF- See Condition 448, Revision 3, the determination of control room envelope (CRE) unfiltered inleakage as required by SR 3.7.9.4, in accordance with TS 5.5.16.c.(i), the assessment of CRE habitability as required by TS 5.5.16.c.(ii), and the measurement of CRE pressure as required by TS 5.5.16.d, shall be considered met.Following implementation: (a) The first performance of SR 3.7.9.4 in accordance with TS 5.5.16.c.(i), shall be within the specified Frequency of 6 years, plus the 18 month allowance of SR 3.0.2, as measured from October 2003, the date of the most recent successful tracer gas test, as stated in the February 19, 2004 letter response to Generic Letter 2003-01, or within the next 18 months if the time period since the most recent successful tracer gas test is greater than 6 years.(b) The first performance of the periodic assessment of CRE habitability, TS 5.5.16.c.(ii), shall be within 3 years, plus the 9 month allowance of SR 3.0.2 as measured from October 2003, the date of the most recent successful tracer gas test, as stated in the February 19, 2004 letter response to Generic Letter 2003-01, or within the next 9 months if the time period since the most recent successful tracer gas test is greater than 3 years.(c) The first performance of the periodic measurement of CRE pressure, TS 5.5.16.d, shall be within 18 months, plus the 138 days allowed by SR 3.0.2, as measured from January 2007, the date of the most recent successful pressure measurement test, or within 138 days if not performed previously.
Renewed License No. NPF-9 Amendment No. 249 B-2 APPENDIX C ANTITRUST CONDITIONS Pursuant to an Order by the Atomic Safety and Licensing Board, dated April 23, 1975, the Nuclear Regulatory Commission incorporates in Renewed Operating License NPF-9 the following antitrust conditions:
- a. The licensee makes the commitments contained herein, recognizing that bulk power supply arrangements between neighboring entities normally tend to serve the public interest.
In addition, where there are net benefits to all participants such arrangements also serve the best interests of each of the participants.
Among the benefits of such transactions are increased electric system reliability, a reduction in the cost of electric power, and minimization of the environmental effects of the production and sale of electricity.
Any particular bulk power supply transaction may afford greater benefits to one participant than to another. The benefits realized by a small system may be proportionately greater than those realized by a larger system. The relative benefits to be derived by the parties from a proposed transaction, however, should not be controlling upon a decision with respect to the desirability of participating in the transaction.
Accordingly, the licensee will enter into proposed bulk power transactions of the types hereinafter described which, on balance, provide net benefits to the licensee.
There are net benefits in a transaction if the licensee recovers the cost of the transaction, (as defined in subparagraph (1)(d) hereof) and there is no demonstrable net detriment to the licensee arising from the transaction.
(1) As used herein: (a) "Bulk Power" means electric power and any attendant energy, supplied or made available at transmission or sub-transmission voltage by one electric system to another.(b) "Neighboring Entity" means a private or public corporation, a governmental agency or authority, a municipality, a cooperative, or a lawful association of any of the foregoing owning or operating, or proposing to own or operate, facilities for the generation and transmission of electricity which meets each of the following criteria: (1) its existing or proposed facilities are economically and technically feasible of interconnection with those of the licensee and (2) with the exception of municipalities, cooperatives, governmental agencies or authorities, and associations, it is, or upon commencement of operations will be, a public utility and subject to regulation with respect to rates and service under the laws of North Carolina or South Carolina or under the Federal Power Act; provided, however, that as to associations, each member of such association is either a public utility as discussed in this clause (2) or a municipality, a cooperative or C-1 a governmental agency or authority.(c) Where the phrase "neighboring entity" is intended to include entities engaging or proposing to engage only in the distribution of electricity, this is indicated by adding the phrase "including distribution systems." (d) "Cost" means any appropriate operating and maintenance expenses, together with all other costs, including a reasonable return on the licensee's investment, which are reasonably allocable to a transaction.
However, no value shall be included for loss of revenue due to the loss of any wholesale or retail customer as a result of any transaction hereafter described.
(2) (a) The licensee will interconnect and coordinate reserves by means of the sale and exchange of emergency and scheduled maintenance bulk power with any neighboring entity(ies), when there are net benefits to each party, on terms that will provide for all of the licensee's properly assignable costs as may be determined by the Federal Energy Regulatory Commission and consistent with such cost assignment will allow the other party the fullest possible benefits of such coordination.(b) Emergency service and/or scheduled maintenance service to be provided by each party will be furnished to the fullest extent available from the supplying party and desired by the party in need. The licensee and each party will provide to the other emergency service and/or scheduled maintenance service if and when available from its own generation and, in accordance with recognized industry practice, from generation of other to the extent it can do so without impairing service to its customers, including other electric systems to whom it has firm commitments.(c) Each party to a reserve coordination arrangement will establish its* own reserve criteria, but in no event shall the minimum installed reserve on each system be less than 15%, calculated as a percentage of estimated peak load responsibility.
Either party, if it has, or has firmly planned, installed reserves in excess of the amount called for by its own reserve criterion, will offer any such excess as may in fact be available at the time for which it is sought and for such period as the selling party shall determine for purchase in accordance with reasonable industry practice by the other party to meet such other party's own reserve requirements.
The parties will provide such amounts of spinning reserve as may be adequate to avoid the imposition of unreasonable demands on the other part(ies) in meeting the normal contingencies of operating its (their) system(s).
However, in no circumstances shall such spinning reserve requirement exceed the installed reserve requirement.
C-2 (d) Interconnections will not be limited to low voltages when higher voltages are available from the licensee's installed facilities in the area where interconnection is desired and when the proposed arrangement is found to be technically and economically feasible.(e) Interconnection and reserve coordination agreements will not embody provisions which impose limitations upon the use or resale of power and energy sold or exchanged pursuant to the agreement.
Further, such arrangements will not prohibit the participants from entering into other interconnection and coordination arrangements, but may include appropriate provisions to assure that (i) the licensee receives adequate notice of such additional interconnection or coordination, (ii)the parties will jointly consider and agree upon such measures, if any, as are reasonably necessary to protect the reliability of the interconnected systems and to prevent undue burdens from being imposed on any system, and (iii) the licensee will be fully compensated for its costs. Reasonable industry practice as developed in the area from time to time will satisfy this provision.
(3) The licensee currently has on file, and may hereafter file, with the Federal Energy Regulatory Commission contracts with neighboring entity(ies) providing for the sale and exchange of short-term power and energy, limited term power and energy, economy energy, non-displacement energy, and emergency capacity and energy. The Licensee will enter into contracts providing for the same or for like transactions with any neighboring entity on terms which enable the licensee to recover the full costs allocable to such transaction.
(4) The licensee currently sells capacity and energy in bulk on a full requirements basis to several entities engaging in the distribution of electric power at retail. In addition, the licensee supplies electricity directly to.ultimate users in a number of municipalities.
Should any such entity(ies) or municipality(ies) desire to become a neighboring entity as defined in subparagraph (1)(b) hereof (either alone or through combination with others), the licensee will assist in facilitating the necessary transition through the sale of partial requirements firm power and energy to the extent that, except for such transition, the licensee would otherwise be supplying firm power and energy. The provision of such firm partial requirements service shall be under such rates, terms and conditions as shall be found by the Federal Energy Regulatory Commission to provide for the recovery of the licensee's cost. The licensee will sell capacity and energy in bulk on a full requirements basis to any municipality currently served by the licensee when such municipality lawfully engages in the distribution of electric power at retail.(5) (a) The licensee will facilitate the exchange of electric power in bulk in wholesale transactions over its transmission facilities (1) between or C-3 among two or more neighboring entities including distribution systems with which it is interconnected or may be interconnected in the future, and (2) between any such entity(ies) and any other electric system engaging in bulk power supply between whose facilities the licensee's transmission lines and other transmission lines would form a continuous electric path, provided that permission to utilize such other transmission lines has been obtained.
Such transaction shall be undertaken provided that the particular transaction reasonably can be accommodated by the licensee's transmission system from a functional and technical standpoint and does not constitute the wheeling of power to a retail customer.
Such transmission shall be on terms that fully compensate the licensee for its cost. Any entity(ies) requesting such transmissioh arrangements shall give reasonable notice of its (their) schedule and requirements.(b) The licensee will include in its planning and construction program sufficient transmission capacity as required for the transactions referred to in subparagraph (a) of this paragraph, provided that (1)the neighboring entity(ies) gives the licensee sufficient advance notice as may be necessary reasonably to accommodate its (their)requirements from a functional and technical standpoint and (2) that such entity(ies) fully compensate the licensee for its cost. In carrying out this subparagraph (b), however, the licensee shall not be required to construct or add transmission facilities which (a) will be of no demonstrable present or future benefit to the licensee, or (b) which could be constructed by the requesting entity(ies) without duplicating any portion of the licensee's existing transmission lines, or (c) which would jeopardize the licensee's ability to finance or construct on reasonable terms facilities needed to meet its own anticipated system requirements.
Where regulatory or environmental approvals are required for the construction or addition of transmission facilities needed for the transactions referred to in subparagraph (a) of this paragraph it shall be the responsibility of the entity(ies) seeking the transaction to participate in obtaining such approvals, including sharing in the cost thereof.(6) To increase the possibility of achieving greater reliability and economy of electric generation and transmission facilities, the licensee will.discuss load projections and system development plans with any neighboring entity(ies).
(7) When the licensee's plans for future nuclear generating units (for which application will hereafter be made to the Nuclear Regulatory commission) have reached the stage of serious planning, but before firm decisions have been made as to the size and desired completion date of the proposed nuclear units, the licensee will notify all neighboring entities including distribution systems with peak loads smaller than the licensee's that the licensee plans to construct such C-4 nuclear units. Neither the timing nor the information provided need be such as to jeopardize obtaining the required site at the lowest possible cost.(8) The foregoing commitments shall be implemented in a manner consistent with the provisions of the Federal Power Act and all other lawful local, state and Federal regulation and authority.
Nothing in these commitments is intended to determine in advance the resolution of issues which are properly raised at the Federal Energy Regulatory Commission concerning such commitments, including allocation of costs or the rates to be charged. The licensee will negotiate (including the execution of a contingent statement of intent) with respect to the foregoing commitments with any neighboring entity including distribution systems where applicable engaging in or proposing to engage in bulk power supply transactions, but the licensee shall not be required to enter into any final arrangement prior to resolution of any substantial questions as to the lawful authority of an entity to engage in the transactions.
In addition, the licensee shall not be obligated to enter into a given bulk power supply transaction if: (1) to do so would violate, or incapacitate it from performing, and existing lawful contracts it has with a third party; (2) there is contemporaneously available to it a competing or alternate arrangement which affords it greater benefits which would be mutually exclusive of such arrangement; (3) to do so would adversely affect its system operations or the reliability of power supply to its customers, or (4) if to do so would jeopardize the licensee's ability to finance or construct on reasonable terms facilities needed to meet its own anticipated system requirements.
C-5 DUKE ENERGY CAROLINAS, LLC DOCKET NO. 50-370 MCGUIRE NUCLEAR STATION, UNIT 2 RENEWED FACILITY OPERATING LICENSE Renewed License No. NPF-17 1. The U.S. Nuclear Regulatory Commission (Commission), having previously made the findings set forth in License No. NPF-17 issued on March 3, 1983, has now found that: A. The application for renewed operating license filed by the Duke Energy Corporation*
complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's regulations set forth in 10 CFR Chapter I and all required notifications to other agencies or bodies have been duly made;B. Actions have been identified and have been or will be taken with respect to (1)managing the effects of aging during the period of extended operation on the functionality of structures and components that have been identified to require review under 10 CFR 54.21 (a)(1), and (2) time-limited aging analyses that have been identified to require review under 10 CFR 54.21 (c), such that there is reasonable assurance that the activities authorized by the renewed operating license will continue to be conducted in accordance with the current licensing basis, as defined in 10 CFR 54.3, for the McGuire Nuclear Station, Unit 2 (facility or plant), and that any changes made to the plant's current licensing basis in order to comply with 10 CFR 54.29(a) are in accord with the Act and the Commission's regulations; C. The facility will operate in conformity with the application, as amended, the provisions of the Act, and the regulations of the Commission; D. There is reasonable assurance: (i) that the activities authorized by this renewed operating license can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations set forth in 10 CFR Chapter I;E. The licensee is technically qualified to engage in the activities authorized by this renewed operating license in accordance with the Commission's regulations set forth in 10 CFR Chapter I;Duke Energy Corporation converted to Duke Power Company LLC on April 3, 2006 and was re-named Duke Energy Carolinas, LLC as of October 1, 2006. Duke Energy Carolinas, LLC is the owner and operator of McGuire Nuclear Station, Unit 2. References to the "licensee" or "Duke" are to Duke Energy Carolinas, LLC.Renewed License No. NPF-17 Amendment No. 225 F. The licensee has satisfied the applicable provisions of 10 CFR Part 140,"Financial Protection Requirements and Indemnity Agreements", of the Commission's regulations; G. The issuance of this renewed operating license will not be inimical to the common defense and security or to the health and safety of the public;H. After weighing the environmental, economic, technical, and other benefits of the facility against environmental and other costs and considering available alternatives, the issuance of this Renewed Facility Operating License No. NPF-17 is in accordance with 10 CFR Part 51, of the Commission's regulations and all applicable requirements have been satisfied; and, I. The receipt, possession, and use of source, byproduct and special nuclear material as authorized by this renewed operating license will be in accordance with the Commission's regulations in 10 CFR Parts 30, 40 and 70.2. Based on the foregoing findings and the Initial Decisions issued by the Atomic Safety and Licensing Board dated April 18, 1979, and May 26, 1981, and the Decision of the Atomic Safety and Licensing Appeal Board dated March 30, 1982, regarding this facility, Renewed Facility Operating License No. NPF-17 is hereby issued to Duke Energy Carolinas, LLC to read as follows: A. This renewed operating license applies to the McGuire Nuclear Station, Unit 2, a pressurized water reactor and associated equipment (the facility) owned and operated by Duke Energy Carolinas, LLC. The facility is located on the site in Mecklenburg County, North Carolina, on the shore of Lake Norman approximately 17 miles northwest of Charlotte, North Carolina, and is described in the Updated Final Safety Analysis Report, as supplemented and amended, and in the Environmental Report, as supplemented and amended.B. Subject to the conditions and requirements incorporated herein, the Commission hereby licenses Duke Energy Carolinas, LLC: (1) Pursuant to Section 103 of the Act and 10 CFR Part 50, to possess, use, and operate the facility at the designated location in Mecklenburg County, North Carolina, in accordance with the procedures and limitations set forth in this renewed operating license;(2) Pursuant to the Act and 10 CFR Part 70 to receive, possess and use at any time special nuclear material as reactor fuel, in accordance with the limitations for storage and amounts required for reactor operation, as described in the Updated Final Safety Analysis Report, as supplemented and amended;(3) Pursuant to the Act and 10 CFR Parts 30, 40 and 70 to receive, possess and use at any time any byproduct, source and special nuclear material as sealed neutron sources for reactor startup, sealed sources for reactor instrumentation and radiation monitoring equipment calibration, and as fission detectors in amounts as required;Renewed License No. NPF-17 Amendment No. 225 (4) Pursuant to the Act and 10 CFR Parts 30, 40 and 70, to receive, possess and use in amounts as required any byproduct, source or special nuclear material without restriction to chemical or physical form, for sample analysis or instrument calibration or associated with radioactive apparatus or components; (5) Pursuant to the Act and 10 CFR Parts 30, 40 and 70, to possess, but not separate, such byproducts and special nuclear materials as may be produced by the operation of McGuire Nuclear Station, Units 1 and 2; and, (6) Pursuant to the Act and 10 CFR Parts 30 and 40, to receive, possess and process for release or transfer such byproduct material as may be produced by the Duke Training and Technology Center.C. This renewed operating license shall be deemed to contain and is subject to the conditions specified in the Commission's regulations set forth in 10 CFR Chapter I and is subject to all applicable provisions of the Act and to the rules, regulations, and orders of the Commission now or hereafter in effect; and is subject to the additional conditions specified or incorporated below: (1) Maximum Power Level The licensee is authorized to operate the facility at a reactor core full steady state power level of 3411 megawatts thermal (100%).(2) Technical Specifications.The Technical Specifications contained in Appendix A, as revised through Amendment No. 248, are hereby incorporated into this renewed operating license. The licensee shall operate the facility in accordance with the Technical Specifications.
(3) Updated Final Safety Analysis Report The Updated Final Safety Analysis Report supplement submitted pursuant to 10 CFR 54.21(d), as revised on December 16, 2002, describes certain future activities to be completed before the period of extended operation.
Duke shall complete these activities no later than March 3, 2023, and shall notify the NRC in writing when implementation of these activities is complete and can be verified by NRC inspection.
The Updated Final Safety Analysis Report supplement as revised on December 16, 2002, described above, shall be included in the next scheduled update to the Updated Final Safety Analysis Report required by 10 CFR 50.71 (e)(4), following issuance of this renewed operating license.Until that update is complete, Duke may make changes to the programs described in such supplement without prior Commission approval, provided that Duke evaluates each such change pursuant to the criteria set forth in 10 CFR 50.59, and otherwise complies with the requirements in that section.Renewed License No. NPF-17 Amendment No. 248 (4) Fire Protection Program Duke Energy Carolinas, LLC shall implement and maintain in effect all provisions of the approved fire protection program as described in the Updated Final Safety Analysis Report for the facility and as approved in the SER dated March 1978 and Supplements 2, 5, and 6 dated March 1979, April 1981, and February 1983, respectively, and the safety evaluation dated May 15, 1989, subject to the following provisions:
The licensee may make changes to the approved fire protection program without prior approval of the Commission only if those changes would not adversely affect the ability to achieve and maintain safe shutdown in the event of a fire.(5) Protection of the Environment Before engaging in additional construction or operational activities which may result in a significant adverse environmental impact that was not evaluated or that is significantly greater than that evaluated in the Final Environmental Statement dated April 1976, the licensee shall provide written notification to the Office of Nuclear Reactor Regulation.
(6) Additional Conditions The Additional Conditions contained in Appendix B, as revised through Amendment No. 181, are hereby incorporated into this renewed operating license. Duke Energy Carolinas, LLC shall operate the facility in accordance with the Additional Conditions.
(7) Antitrust Conditions The licensee shall comply with the antitrust conditions delineated in Appendix C of this renewed operating license.(8) Mitigation Strategy License Condition Develop and maintain strategies for addressing large fires and explosions and that include the following key areas: A) Fire fighting response strategy with the following elements: 1. Pre-defined coordinated fire response strategy and guidance 2. Assessment of mutual aid fire fighting assets 3. Designated staging areas for equipment and materials 4. Command and control 5. Training of response personnel B) Operations to mitigate fuel damage considering the following:
- 1. Protection and use of personnel assets 2. Communications
- 3. Minimizing fire spread Renewed License No. NPF-17 Amendment No. 244 4. Procedures for implementing integrated fire response strategy 5. Identification of readily-available pre-staged equipment 6. Training on integrated fire response strategy 7. Spent fuel pool mitigation measures C) Actions to minimize release to include consideration of: 1. Water spray scrubbing 2. Dose to onsite responders D. Physical Protection Duke Energy Carolinas, LLC shall fully implement and maintain in effect all provisions of the Commission-approved physical security, training and qualification and safeguards contingency plans including amendments made pursuant to provisions of the Miscellaneous Amendments and Search Requirements revisions to 10 CFR 73.55 (51 FR 27817 and 27822) and to the authority of 10 CFR 50.90 and 10 CFR 50.54(p).
The combined set of plans, which contains safeguards information protected under 10 CFR 73.21, is entitled: "Duke Energy Physical Security Plan" submitted by letter dated September 8, 2004, and supplemented on September 30, 2004, October 15, 2004, October 21, 2004, and October 27, 2004.Duke Energy Carolinas, LLC shall fully implement and maintain in effect all provisions of the Commission-approved cyber security plan (CSP), including changes made pursuant to the authority of 10 CFR 50.90 and 10 CFR 50.54(p).The Duke Energy Carolinas, LLC CSP was approved by License Amendment No. 244.E. Deleted by Amendment No. 215.F. The licensee shall have and maintain financial protection of such type and in such amounts as the Commission shall require in accordance with Section 170 of the Atomic Energy Act of 1954, as amended, to cover public liability claims.G. In accordance with the Commission's direction in its Statement of Policy, Licensing and Regulatory Policy and Procedures for Environmental Protection:
Uranium Fuel Cycle Impacts, October 29, 1982, this renewed operating license is subject to the final resolution of the pending litigation involving Table S-3.See, Natural Resources Defense Council v. NRC, No. 74-1586 (D.C. cir. April 27, 1982).H. The licensee is authorized to receive from the Oconee Nuclear Station, Units 1, 2, and 3, possess, and store irradiated Oconee fuel assemblies containing special nuclear material, enriched to not more than 3.24% by weight U-235 subject to the following conditions:
- a. Oconee fuel assemblies may not be placed in the McGuire Nuclear Station, Unit 1 and 2, reactors.b. Irradiated fuel shipped to McGuire Nuclear Station, Units 1 and 2, from Oconee shall have been removed from the Oconee reactor no less than 270 days prior to shipment.Renewed License No. NPF-17 Amendment No. 244 c. No more than 300 Oconee irradiated fuel assemblies shall be received for storage at McGuire Nuclear Station.d. Burnup of Oconee fuel shipped shall be no greater than 36,000 MW days per metric ton.e. Receipt of irradiated Oconee fuel shall be limited by the use of the NFS-4 (NAC-1), NLI-1/2, TN-8, or TN-8L spent fuel casks.f. The spent fuel pool crane travel shall be restricted by administrative controls to the paths required by Selected Licensee Commitment 16.9.20 whenever a spent fuel cask is being handled.g. Oconee fuel assemblies may not be transferred from one McGuire spent fuel pool to the other.3. This renewed operating license is effective as of the date of issuance and shall expire at midnight on March 3, 2043.FOR THE NUCLEAR REGULATORY COMMISSION J.E. Dyer, Director Office of Nuclear Reactor Regulation
Attachment:
- 1. Appendix A -Technical Specifications
- 2. Appendix B -Additional Conditions
- 3. Appendix C -Antitrust Conditions Date of Issuance:
December 5, 2003 Renewed License No. NPF-17 APPENDIX B ADDITIONAL CONDITIONS FACILITY OPERATING LICENSE NO. NPF-17 Duke Energy noted below: Carolinas, LLC shall comply with the following conditions on the schedules Amendment Additional Implementation Number Conditions Date 166 The schedule for the performance of new and Within 90 days of revised surveillance requirements shall be as the date of this follows: amendment.
For surveillance requirements (SRs) that are new in Amendment No. 166 the first performance is due at the end of the first surveillance interval that begins at implementation of Amendment No. 166. For SRs that existed prior to Amendment No. 166, including SRs with modified acceptance criteria and SRs whose intervals of performance are being extended, the first performance is due at the end of the first surveillance interval that begins on the date the surveillance was last performed prior to implementation of amendment No. 166. For SRs that existed prior to Amendment No. 166, whose intervals of performance are being reduced, the first reduced surveillance interval begins upon completion of the first surveillance performed after implementation of Amendment No. 166.I Renewed License No. NPF-17 Amendment No. 238 B-1 APPENDIX B ADDITIONAL CONDITIONS FACILITY OPERATING LICENSE NO. NPF-17 Duke Power Power Company LLC shall comply with the following conditions on the schedules noted below: Amendment Additional Implementation Number Conditions Date 229 Upon implementation of the Amendment adopting See Condition TSTF-448, Revision 3, the determination of control room envelope (CRE) unfiltered inleakage as required by SR.3.7.9.4, in accordance with TS 5.5.16.c.(i), the assessment of CRE habitability as required by TS 5.5.16.c.(ii), and the measurement of CRE pressure as required by TS 5.5.16.d, shall be considered met.Following implementation:
.(a) The first performance of SR 3.7.9.4 in accordance with TS 5.5.16.c.(i), shall be within the specified Frequency of 6 years, plus the 18 month allowance of SR 3.0.2, as measured from October 2003, the date of the most recent successful tracer gas test, as stated in the February 19, 2004 letter response to Generic Letter 2003-01, or within the next 18 months if the time period since the most recent successful tracer gas test is greater than 6 years.(b) The first performance of the periodic assessment of CRE habitability, TS 5.5.16.c.(ii), shall be within 3years, plus the 9 month allowance of SR 3.0.2 as measured from October 2003, the date of the most recent successful-tracer gas test, as stated in the February 19, 2004 letter response to Generic Letter 2003-01, or within the next 9 months if the time period since the most recent successful tracer gas test is greater than 3 years.(c) The first performance of the periodic measurement of CRE pressure, TS 5.5.16.d, shall be within 18 months, plus the 138 days allowed by SR 3.0.2, as measured from January 2007, the date of the most recent successful pressure measurement test, or within 138 days if not performed previously.
Renewed License No. NPF-17 Amendment No. 229 B-2 APPENDIX C ANTITRUST CONDITIONS Pursuant to an Order by the Atomic Safety and Licensing Board, dated April 23, 1975, the Nuclear Regulatory Commission incorporates in Operating License NPF-17 the following antitrust conditions:
- a. The licensee makes the commitments contained herein, recognizing that bulk power supply arrangements between neighboring entities normally tend to serve the public interest.
In addition, where there are net benefits to all participants such arrangements also serve the best interests of each of the participants.
Among the benefits of such transactions are increased electric system reliability, a reduction in the cost of electric power, and minimization of the environmental effects of the production and sale of electricity.
Any particular bulk power supply transaction may afford greater benefits to one participant than to another. The benefits realized by a small system may be proportionately greater than those realized by a larger system. The relative benefits to be derived by the parties from a proposed transaction, however, should not be controlling upon a decision with respect to the desirability of participating in the transaction.
Accordingly, the licensee will enter into proposed bulk power transactions of the types hereinafter described which, on balance, provide net benefits to the licensee.
There are net benefits in a transaction if the licensee recovers the cost of the transaction (as defined in subparagraph (1)(d) hereof) and there is no demonstrable net detriment to the licensee arising from the transaction.
(1) As used herein: (a) "Bulk Power" means electric power and any attendant energy, supplied or made available at transmission or sub-transmission voltage by one electric system to another.(b) "Neighboring Entity" means a private or public corporation, a governmental agency or authority, a municipality, a cooperative, or a lawful association of any of the foregoing owning or operating, or proposing to own or operate, facilities for the generation and transmission of electricity which meets each of the following criteria: (1) its existing or proposed facilities are economically and technically feasible of interconnection with those of the licensee and (2) with the'exception of municipalities, cooperatives, governmental agencies or authorities, and associations, it is, .or upon commencement of operations will be, a public utility and subject to regulation with respect to rates and service under the laws of North Carolina or South Carolina or under the Federal Power Act; provided, however, that as to associations, each member of such association is either a public utility as discussed in this clause (2) or C-1 a municipality, a cooperative or a governmental agency or authority.(c) Where the phrase "neighboring entity" is intended to include entities engaging or proposing to engage only in the distribution of electricity, this is indicated by adding the phrase "including distribution systems." (d) "Cost means any appropriate operating and maintenance expenses, together with all other costs, including a reasonable return on the licensee's investment, which are reasonably allocable to a transaction.
However, no value shall be included for loss of revenue due to' the loss of any wholesale or retail customer as a result of any transaction hereafter described.
(2) (a) The licensee will interconnect and coordinate reserves by means of the sale and exchange of emergency and scheduled maintenance bulk power with any neighboring entity(ies), when there are net benefits to each party, on terms that will provide for all of the licensee's properly assignable costs as may be determined by the Federal Energy Regulatory Commission and consistent with such cost assignment will allow the other party the fullest possible benefits of such coordination.(b) Emergency service and/or scheduled maintenance service to be provided by each party will be furnished to the fullest extent available from the supplying party and desired by the party in need. The licensee and each party will provide to the other emergency service, and/or scheduled maintenance service if and when available from its own generation and, in accordance with recognized industry practice, from generation of other to the extent it can do so without impairing service to its customers, including other electric systems to whom it has firm commitments.(c) Each party to a reserve coordination arrangement will establish its own reserve criteria, but in no event shall the minimum installed reserve on each system be less than 15%, calculated as a percentage of estimated peak load responsibility.
Either party, if it has, or has firmly planned, installed reserves in excess of the amount called for by its own reserve criterion, will offer any such excess as may in fact be available at the time for which it is sought and for such period as the selling party shall determine for purchase in accordance with reasonable industry practice by the other party to meet such other party's own reserve requirements.
The parties will provide such amounts of spinning reserve as may be adequate to avoid the imposition of unreasonable demands on the other part(ies) in meeting the normal contingencies of operating its (their) system(s).
However, in no circumstances shall such spinning reserve requirement exceed the installed reserve requirement.(d) Interconnections will not be limited to low voltages when higher voltages are C-2 available from the licensee's installed facilities in the area where interconnection is desired and when the proposed arrangement is found to be technically and economically feasible.(e) Interconnection and reserve coordination agreements will not embody provisions which impose limitations upon the use or resale of power and energy sold or exchanged pursuant to the agreement.
Further, such arrangements will not prohibit the participants from entering into other interconnection and coordination arrangements, but may include appropriate provisions to assure that (i) the licensee receives adequate notice of such additional interconnection or coordination, (ii)the parties will jointly consider and agree upon such measures, if any, as are reasonably necessary to protect the reliability of the interconnected systems and to prevent undue burdens from being imposed on any system, and (iii) the licensee will be fully compensated for its costs. Reasonable industry practice as developed in the area from time to time will satisfy this provision.
(3) The licensee currently has on file, and may hereafter file, with the Federal Energy Regulatory Commission contracts with neighboring entity(ies) providing for the sale and exchange of short-term power and energy, limited term power and energy, economy energy, non- displacement energy, and emergency capacity and energy. The Licensee will enter into contracts providing for the same or for like transactions with any neighboring entity on terms which enable the licensee to recover the full costs allocable to such transaction.
(4) The licensee currently sells capacity and energy in bulk on a full requirements basis to several entities engaging in the distribution of electric power at retail. In addition, the licensee supplies electricity directly to ultimate users in a number of municipalities.
Should any such entity(ies) or municipality(ies) desire to become a neighboring entity as defined in subparagraph (1)(b) hereof (either alone or through combination with others), the licensee will assist in facilitating the necessary transition through the sale of partial requirements firm power and energy to the extent that, except for such transition, the licensee would otherwise be supplying firm power and energy. The provision of such firm partial requirements service shall be under such rates, terms and conditions as shall be found by the Federal Energy Regulatory Commission to provide for the recovery of the licensee's cost. The licensee will sell capacity and energy in bulk on a full requirements basis to any municipality currently served by the licensee when such municipality lawfully engages in the distribution of electric power at retail.(5) (a) The licensee will facilitate the exchange of electric power in bulk in wholesale transactions over its transmission facilities (1) between or among two or more neighboring entities including distribution systems with which it is interconnected or may be interconnected in the future, and (2) between any such entity(ies) and any other electric system engaging in bulk power supply between whose facilities the licensee's transmission C-3 lines and other transmission lines would form a continuous electric path, provided that permission to utilize such other transmission lines has been obtained.
Such transaction shall be undertaken provided that the particular transaction reasonably can be accommodated by the licensee's transmission system from a functional and technical standpoint and does not constitute the wheeling of power to a retail customer.
Such transmission shall be on terms that fully compensate the licensee for its cost. Any entity(ies) requesting such transmission arrangements shall give reasonable notice of its (their) schedule and requirements.(b) The licensee will include in its planning and construction program sufficient transmission capacity as required for the transactions referred to in subparagraph (a) of this paragraph, provided that (1) the neighboring entity(ies) gives the licensee sufficient advance notice as may be necessary reasonably to accommodate its (their) requirements from a functional and technical standpoint and (2) that such entity(ies) fully compensate the licensee for its cost. In carrying out this subparagraph (b), however, the licensee shall not be required to construct or add transmission facilities which (a) will be of no demonstrable present or future benefit to the licensee, or (b) which could be constructed by the requesting entity(ies) without duplicating any portion of the licensee's existing transmission lines, or (c) which would jeopardize the licensee's ability to finance or construct on reasonable terms facilities needed to meet its own anticipated system requirements.
Where regulatory or environmental approvals are required for the construction or addition of.transmission facilities needed for the transactions referred to in subparagraph (a) of this paragraph it shall be the responsibility of the entity(ies) seeking the transaction to participate in obtaining such approvals, including sharing in the cost thereof.(6) To increase the possibility of achieving greater reliability and economy of electric generation and transmission facilities, the licensee will discuss load projections and system development plans with any neighboring entity(ies).
(7) When the licensee's.
plans for future nuclear generating units (for which application will hereafter be made to the Nuclear Regulatory commission) have reached the stage of serious planning, but before firm decisions have been made as to the size and desired completion date of the proposed nuclear units, the licensee will notify all neighboring entities including distribution systems with peak loads smaller than the licensee's that the licensee plans to construct such nuclear units. Neither the timing nor the information provided need be such as to jeopardize obtaining the required site at the lowest possible cost.The foregoing commitments shall be implemented in a manner consistent with the provisions of the Federal Power Act and all other lawful local, state andý Federal regulation and authority.
Nothing in these commitments is intended to determine in advance the resolution of issues which are properly raised at the Federal Energy Regulatory Commission concerning such commitments, C-4 including allocation of costs or the rates to be charged. The licensee will negotiate (including the execution of a contingent statement of intent) with respect to the foregoing commitments with any neighboring entity including distribution systems where applicable engaging in or proposing to engage in bulk power supply transactions, but the licensee shall not be required to enter into any final arrangement prior to resolution of any substantial
- questions as to the lawful authority of an entity to engage in the transactions.
In addition, the licensee shall not be obligated to enter into a given bulk power supply transaction if: (1) to do so would violate, or incapacitate it from performing, and existing lawful contracts it has with a third party; (2) there is contemporaneously available to it a competing or alternate arrangement which affords it greater benefits which would be mutually exclusive of such arrangement; (3) to do so would adversely affect its system operations or the reliability of power supply to its customers, or (4) if to do so would jeopardize the licensee's ability to finance or construct on reasonable terms facilities needed to meet its own anticipated system requirements.
C-5 McGuire Nuclear Station Technical Specifications LOEP Page Number Amendment' Revision Date 243/224 7/26/07 ii 237/219 .3/1/07 iii 184/166 9/30/98 iv 184/166 9/30/98 1.1-1 184/166 9/30/98 1.1-2. 266/246 6/25/12 1.1-3 237/219 3/1i07 1.1-4 194/175 9/118/00'1.1-5 255/235 5/28/10 1.1-6 261/241 3/29/11 1.1-7 194/175 .9/18/00 1.2-1 184/166 9/30/98 1.2-2 184/166 9/30/98 1.2-3 184/166 9/30/98 1.3-1 184/166 9/30/98 1.3-2 184/166 9/30/98 1.3-3 184/166 9/30/98 1.3-4 184/166 9/30/98 1.3-5 184/166 9/30/98 1.3-6 184/166 "9/30/98 1.3-7 184/166 9/30/98 1.3-8 184/166 9/30/98 1.3-9 184/166 9/30/98 11.3-10 184/166 9/30198 1.3-11 184/166 9/30/98-1.3-12 184/166 9/30/98 1.3-13 184/166 9/30/98 1.4-1 1841166 9/30/98-1.4-2 184/166 9/30/98 1.4-3 184/166 9/30/98 1.4-4 184/166 9/30/98 2.0-1 219/201 1/14/04 re Units 1 and 2 Page 1 .Revision 94 McGuir v Page Number Amendment'Revision Date 3.0-1 3.0-2 3.0-3 3.0-4 3.0-5 3.1.1-1 3.1.2-1 3.1.2-2 3.1.3-1 3.1.3-2 3.1.3-3 3.1.4-1 381.4-2 3.1.4-3 3.1.4-4 3.1.5-1 3.1.5-2 3:1.6-1 3.1.6-2 3.1.6-3 3.1.7-1 3.1.7-2 3.1.8-1 3.1.8-2 3.2. 1-1 3.2.1-2 3.2.1-3 3.2.1-4 3.2.1-5 3.2.2-1 3.2.2-2 3.2.2-3 3.2.2-4 3.2.3-1 238/220 221/203 238/220 205/186 221/203 261/241 184/166 261/241 184/166 184/166-184/166 184/166 184/166 261/241 261/241 184/166 261/241 184/166 184/166 261/241 184/166 184/166 184/166 261/241 184/166 184/166 261/241 261/241 261/241 184/166 184/166 261/241 261/241 261/241'3/29/07 4/29/04 3/29/07 8/12/02 4/29/04 3/29/1l 9/30/98 3/29/11 9/30/98 9/30/98 9/30/98 9/30/98 9/30/98 3/29/11 3/29/11 9/30/98 3/29/11 9/30/98 9/30/98 3/29/11 9/30/98 9/30/98 9/30/98 3/29/11 9/30/98 9/30/98 3/29/11 3/29/11 3/29/11 9/30/98 9/30/98 3/29/11 3/29/11.3/29/11 McGuire Units 1 and 2 Page 2 Revision 94 Page Number 3.2.4-1 3.2.4-2 3.2.4-3 3.2.4-4 3.3.1-1 3.3.1-2 3.3.1-3 3.3.1-4 3.3.1-5 3.3.1-6 3.3.1-7 3.3.1-8 3.3.1-9 3.3.1-10 3.3.1-11 3.3.1-12 3.3.1-13 3.3.1-14 3.3.1-15 3.3.1-16 3.3.1-17 3.3.1-18 3.3.1-19 3.3.1-20 3.3.2-1 3.3.2-2 3.3.2-3 3.3.2-4 3.3.2-5 3.3.2-6 3.3.2-7 3.3.2-8 3.3.2-9 3.3.2-10 McGuire Units 1 and 2 Amendment 184/166 184/166 184/166 261/241 184/166 248/2.28 248/228 216/197 250/230 248/228 248/228 184/166 261/241 261/241 261/241 261/241 261/241 257/237 257/237 257/237 268/248 219/201 219/201 184/166 184/166 250/230 248/228 248/228 248/228 198/179 198/179 261/241 261/241 265/245 Page 3 Revision Date 9/30/98 9/30/98 9/30/98 3/29/11 9/30/98.3/9/09 3/9/09 7/29/03'3/9/09 3/9/09'3/9/09 9/30/98 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 8/2/10 8/2/10 8/2/10 10/1/12 1/14/04 1/14/04 9/30/98 9/30/98 3/9/09 3/9/09 3/9/09 3/9/09 4/12/01 4/12/01 3/29/11 3/29/1.1 9/12/11 Revision 94 Page Number Amendment Revision Date 3.3.2-11 265/245 9/12/11 3.3.2-12 265/245 9/12/11 3.3.2-13 265/245 9/12/11 3.3.2-14 265/245 9/12/11 3.3.2-15 265/245 9/12/11 3.3.3-1 221/203 4/29/04 3.3.3-2 227/209 4/4/05 3.3.3-3 261/241 3/29/11 3.3.3-4 227/209 4/4/05 3.3.4-1 221/203 4/29/04 3.3.4-2 261/241 3/29/11.3.3.4-3 184/166 9/30/98 3.3.5-1 184/166 9/30/98 3.3.5-2 261/241 3/29/11 3.3.6-1 Not Used -243/224 7/26/07 3.4.1-1 219/201 1/14/04 3.4.1-2 219/201 1/14/04 3.4.1-3 261/241 3/29/11 3.4.1-4 219/201 1/14/04 3.4.2-1 184/166 9/30/98 3.4.3-1 214/195 7/3/03 3.4.3-2 261/241 3/29/11 3.4.3-3 214/195 7/3/03 3.4.3-4 214/195 7/3/03 3.4.3-5 214/195 7/3/03 3.4.3-6 214/195 7/3/03 3.4.3-7 214/195 713/03 3.4.3-8 214/195 7/3/03 3.4.4-1 261/241 3/29/11 3.4.5-1 216/197 7/29/03 3.4.5-2 216/197 7/29/03 3.4.5-3 261/241 3/29/11 3.4.6-1 216/197 7/29/03 3.4.6-2 261/241 3/29/11 McGuire Units I and 2 Page 4 Revision 94 Page Number 3.4.7-1 3.4.7-2 3.4.7-3 3.4.8-1 3.4.8-2 3.4.9-1 3.4.9-2, 3.4.10-1 3.4.1 0-2 3.4-1 1-1 3.4.11-2 3.4-11-3 3.4.11-4 3.4.12-1 3.4.12-2 3.4.12-3 3.4.12-4.3.4.12-5 3.4:12-6 3.4.13-1 3.4.13-2'3.4.14-1 3.4.14-2 3.4.14-3 3.4.14-4 3.4.15-1 3.4.15-2'3.4.15-3 3.4.15-4 3.4.16-1 3.4.16-2 3.4.16-3 3.4.16-4*3.4.1,7-1 McGuire Units 1 and 2 Amendment 216/197 216/197 261/241 2,16/197 261/241 184/166 261/241 184/1f66 184/166 221/203 184/166 184/1,66 261/241 184/166 221/203 214/195 214/195 261/241 261/241-237/219 261/241 184/166 184/1166 261/241 261/241 235/217 235/217 235/217 261/241 266/246 266/246 261/241 184/166 261/241 Page 5 Revision Date 7/29/03 7/29/03 3/29/111 7/29/03-3/29/11 9/30/98 3/29/11 9/30/98 9/30/98 4/29/04 9/30/98-9/30/98, 3/29/11 9/30/98 4/29/04 7/3/03 7/3/03 3/29/11 3/29/11 3/1/07 3/29/111 9/30/981 9/30/98 3/29/11 3/29/111 9/30/06-9/30/06 9/30/06 3/29/11 6/25/12.6/25/12 3/29/11 9/30/98 3/29/11-1 Revision 94
,Page Number Amendment 3.4.18-1 3.4.18-2 3.5.1-1 3.5.1-2 3.5.2-1 3.5.2-2 3.5.2-3 3.5.3-1 3.5.3-2 3.5.4-1 3.5.4-2 3.5.5-1 3.5.5-2 3.6.1-1 3.6.1-2 3.6.2-1 3.6.2-2 3.6.2-3 3.6.2-4 3.6.2-5 3.6.3-1 3.6.3-2 3.6.3-3 3.6.3-4 3.6.3-5 3.6.3-6 3.6.3-7 3.6.4-1 3.6.5-1 3.6.5-2 3.6.6-1 3.6.6-2 3.6.7-1 3.6.8-1 237/219 237/219 218/200 261/241 184/166 261/241, 261/241 221/203 184/166 184/166 9/12/11 184/166-261/241 207/188 207/188 184/166 184/166 184/166 184/166 261/241 243/1224 184/166 184/166 184/166 261/241 261/241 2071188 261/241 184/166 261/241 9/12/11 9/12/11 Not Used -227/209 221/203 Revision Date 3/1/07 3/1/07 12/23/03 3/29/11 9/30/98 3/29/11 3/29/11 4/29/04 9/30/98 9/30/98 9/12il 1 9/30/98 3/29/11 9/4/02 9/4/02 9/30/98 9/30/98 9/30/98 9/30/98 3/29/11 7/26/07 9/30/98 9/30/98 9/30/98 3/29/11 3/29/11 9/4/02 3/29/11 9/30/98 3/29/11 9/12/11 9/12/11 4/4/05 4/29/04 McGuire Units 1 and 2 Pv.Page 6 Revision 94
'Page Number Amendment Revision Date 3.6.8-2 261/241 3/29/11 3.6.9-1 184/166 9/30/98, 3.6.9-2 261/241 3/29/11 3.6.10-1 184/166 9/30/98 3.6.10-2 261/241 3/29/11 3.6.11-1 261/241 3/29/11 3.6.11-2 2611241 3/29/11 3.6.12-1 261/241 3/29/11 3.6'.12-2 261/241 3/29/11 3.6.12-3 261/241 ,3/29/11 3.6.13-1 256/236 6/28/10 3.6.13-2 261/241 3/29/11 3.6.13-3 261/241 3/29/11 3.6.14-1 228/210 4/5/05 3.6.14-2 261/241 3/29/11 3.6.14-3 261/241 3/29/11 3.6.15-1 184/166 9/30/98 3.6.15-2 261/241 3/29/11 3.6.16-1 261/2411, 3/29/11.3.6.16-2 261/241 3/29/11 3.7.1-1 184/166.1 9/30/98 3.7.1-2 184/166 9/301/98 3.7.1-3 184/166 9/30/98 3.7.2-1 184/166" 9/30/98 3.7.2-2 184/166 9/30/98 3.7.3-1 184/166 9/30/98 3.7.3-2 184/166 9/30/98 3.7.4-1 221/203 4/29/04 3.7.4-2 261/241 3/29/11 3.7.5-1 221/203 4/29/04 3.7.5-2 184/166 9/30/98 3.7.5-3 261/241 3/29/11 3.7.5-4 261/241 3/29/11 3.7.6-1 184/166 9/30/98 McGuire Units 1 and 2 Page 7 F{evision 94 Page Number 3.7.6-2 3.7.7-1 3.7.7-2 3.7.8-1 3.7.8-2 3.7.9-1 3.7.9-2 3.7.9-3 3.7.10-1 3.7.10-2 3.7.11-1 3.7.11-2 3.7.12-1 3.7.12-2 3.7.13-1 3.7.14-1 3.7,15-1 3.7.15-2 3.7.15-3 3.7.15-4 3.7.15-5 3.7.15-6 3.7.15-7 3.7.15-8 3.7.15-9 3.7.15-10 3.7.15-11 3.7.15-12 3.7.15-13 3.7.15-14 3.7.15-15 3.7.15-16 3.7.15-17 3.7.15-18 Amendment 261/241 184/166 261/241 261/241 261/241 249/229 249/229 261/241 184/166 261/241 229/211 261/241 261/241 261/241, 261/241 261/241 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 Page 8* Revision Date 3/29/11 9/30/98 3/29/11 3/29/11 3/29/11 1/30/09 1/30/09 3/29/11 9/30/98 3/29/11 6/2/05 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3117/05 McGuire Units 1 and 2'Revision 94 Page Number 3.7.15-19, 3.7.15-20 3.7.15-21 3.7.15-22 3.7.15-23 3.7.15-24 3.7.15-25 3.7.15-26 3.7.15-27 3.7.15-28 3.7.15-29 3.7.15-30 3.7.15-31 3.7.15-32 3.7.16-1 3.8.1-1 3.8.1-2 3.8.1-3 3.8.1-4 3.8.1-5 3.8.1-6 3.8.1-7 3.8.1-8 3.8.1-9 3.8.1-10 3.8.1-11 3.8.1-12 3.8.1-13 3.8.1-14 3.8. 1-15 3.8.2-1 3.8.2-2 3.8.2-3 3.8.3-1 Amendment 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 225/207 261/241 221/203 184/166 241/-184/166 261/241 261/241 261/241 261/241 261/241 261/241 261/241 261/241 261/241 261/241 261/241 184/166 216/197 184/166 184/166 Revision Date 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/17/05 3/29/11 4/29/04 9/30/98 6/8/07 9/30/98 3/29/11 3/29/11.3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 9/30/98 7/29/03 9/30/98 9/30/98" McGuire Units 1 and 2 Page 9 Revision 94ý Page Number Amendment Revision Date 3.8.3-2 3.8.3-3 3.8.4-1 3.8.4-2 3.8.4-3 3.8.4-4 3.8.5-1 3.8.5-2 3.8.6-1 3.8.6-2 3.8.6-3.3.8.6-4 3.8.7-1 3.8.8-1 3.8.8-2 3.8.9-1 3.8.9-2 3.8.10-1 3.8.10-2 3.9.1-1 3.9.2-1 3.9.3-1 3.9.3-2 3.9A4-1 3.9.4-2 3.9.5-1 3.9.5-2 3.9.6-1 3.9.6-2 3.9.7-1 4.0.1 4.0.2 5.1-1 5.2-1.267/247 261/241 184/166 261/241 2611241 260/240 184/166 216/197 184/166 261/241 261/241 184/166 261/241 184/166 2611241 184/166 261/241 216/197 261/241 261/241 261/241 216/197 261/241 236/218 261/241 216/197 261/241 216/197 261/241 261/241 225/207 225/207 213/194 239/221 9/29/12 3/29/11 9/30/98 3/29/11 3/29/11 12/20/10 9/30/98 7/29/03 9/30/98 3/29/11 3/29/11 9/30/98 3/29/11 9/30/98 3/29/11 9/30/98 3/29/11 7/29/03 3/29/11 3/29/11 3/29/11 7/29/03 3/29111 12/22/06 3/29/11 7/29/03 3/29/11 7/29/03 3/29/11 3/29/11 3/17/05 3117/05 6/6/03 04/12/07 McGuire Units 1 and 2 Page 10 Revision .94 Page Number 5.2-2 5.3-1 5.4-1*5.5-1 5.5-2 5.5-3 5.5-4 5.5-5 5.5-6 5.5-7 5.5-8 5.5-9 5.5-10 5.5-11 5.5-12 5.5-13 5.5-14 5.5-15 5.5-16.5.6-1 5.6-2 5.6-3 5.6-4 5.6-5 5.7-1 5.7-2 Amendment 253/233 213/194 184/166 244/193 212/193 184/166 184/166 223/205 252/232 237/219 237/219 237/219 237/219 237/219 237/219 237/219 249/229 261/241-261/241 226/208 226/208 226/208 230/212 237/219 213/194 184/166 Revision Date 9/21/09 6/6/03 9/30/98 2/13/08 5/8/03 9/30/98 9/30/98 8/5/04 8il 7/09 3/1/07 3/1/07 3/1/07 3/1/07 3/1/07 3/1/07 3/1/07 1/30/09 3/29/11 3/29/11 3/1/07 3/1/07 3/1/07 8/23/05 3/1/07 6/6/03.9/30/98 McGuire Units I and 2 ,Page I I Revision 94 RTS Instrumentation
3.3.1 Table
3.3.1-1 (page 4 of 7)Reactor Trip System Instrumentation APPLICABLE MODES OR OTHER SPECIFIED CONDITIONS REQUIRED CHANNELS SURVEILLANCE REQUIREMENTS ALLOWABLE VALUE NOMINAL TRIP SETPOINT FUNCTION CONDITIONS
- 16. Reactor Trip System Interlocks
- a. Intermediate Range Neutron Flux, P-6 b. Low Power Reactor Trips Block, P-7 c. Power Range Neutron Flux, P-8 d. Power Range Neutron Flux, P-1 0 e. Turbine Inlet Pressure, P-13 2 (d)2 1 1 per train 4 S SR 3.3.1.11 SR 3.3.1.13 T SR 3.3.1.5 T SR 3.3.1.11 SR 3.3.1.13 S SR 3.3.1.11 SR 3.3.1.13 T SR 3.3.1.12 SR 3.3.1.13>_ 4E-1 1 amp***> 6.6E-6% RTP NA< 49% RTP 1E-10 amp***1 E-5% RTP NA 48% RTP 10% RTP 1,2 4 1 2 2 trains 2 trains> 7% RTP and< 11% RTP< 11% turbine inlet pressure equivalent NA NA 10% turbine inlet pressure equivalent NA NA Reactor Trip Breakers(i) 1,2 3 (a), 4 (a), 5 (a)R, V SR 3.3.1.4 18. Reactor Trip Breaker Undervoltage and Shunt Trip Mechanisms
- 19. Automatic Trip Logic 1,2 1 each per RTB C SR 3.3.1.4 U SR 3.3.1.4 C SR 3.3.1.4 3 (a), 4 (a), 5 (a)1,2 3 (a), 4 (a), 5 (a)1 each per RTB NA NA NA NA NA NA 2 trains 2 trains Q,V SR 3.3.1.5 NA NA C SR 3.3.1.5 The > 4E-1 1 amp Allowable Value and the 1 E-10 amp NOMINAL TRIP SETPOINT value apply to the Westinghouse-supplied compensated ion chamber Intermediate Range neutron detectors.
The compensated ion chamber neutron detectors are being replaced with Thermo Scientific-supplied fission chamber neutron detectors.
The > 6.6E-6% RTP Allowable Value and the 1 E-5% RTP NOMINAL TRIP SETPOINT value apply to the replacement fission chamber Intermediate Range neutron detectors.(a) With RTBs closed and Rod Control System capable of rod withdrawal.(d) Below the P-6 (Intermediate Range Neutron Flux) interlocks.(i) Including any reactor trip bypass breakers that are racked in and closed for bypassing on RTP.McGuire Units 1 and 2 3.3.1-17 Amendment Nos. 268/248 Diesel Fuel Oil and Starting Air 3.8.3 ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME D. ------- NOTE --- D.1 Restore starting air receiver 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> A single starting air pressure to > 210 psig.receiver may be isolated without entering Condition D.One or more DGs with starting air receiver pressure < 210 psig and> 125 psig.E. Required Action and E.1 Declare associated DG Immediately associated Completion inoperable.
Time not met.OR One or more DGs diesel fuel oil or starting air subsystem not within limits for reasons other than Condition A, B, C, or D.McGuire Units 1 and 2 3.8.3-2 UAmendment No. 267/247 McGuire Nuclear Station Technical Specification Bases LOES TS Bases are revised by section Page Number Revision BASES Revision Date Ii iii B 2.1.1 B 2.1.2 B 3.0 B 3.1.1'B 3.1.2 B 3.1.3 B 3.1.4 B 3.1.5 B 3.1.6 B 3.1.7 B 3.1.8 B 3.2.1 B 3.2.2 B 3.2.3 B 3.2.4 B 3.3.1 B 3.3.2 B 3.3.3 B 3.3.4 B 3.3.5 B 3.3.6 B 3.4.1 B 3.4.2 B 3.4.3 B 3.4.4 B 3.4.5 (Revised per section)Revision 87 Revision 87 Revision 87 Revision 51 Revision 109'Revision 81 Revision 115 Revision 115 Revision 10 Revision 115 Revision 115 Revision 115 Revision 58 Revision 115 Revision 115 Revision 115 Revision 115 Revision 115 Revision 124 Revision 122 Revision 122 Revision 115 Revision 115 Not Used -Revision 87 Revision 115 Revision 0 Revision 115 Revision 115 Revision 115 8/15/07 8/15/07 8/15/07 01/14/04 9/20/10 3/29/07 3/29/11 3/29/11 9/22/00 3/29/11 3/29/11 3/29/11 06/23/04 3/29/11 3/29/11 3/29/11 3/29/11 3/29/11 10/1/12 10/25/12 10/25/12 3/29/11 3/29/11 6/29/06 3/29/11 9/30/98 3/29/11 3/29/11 3/29/11 I I I McGuire Units 1 and 2 Page I Revision 113' Page Number Amendment Revision Date B 3.4.6 Revision 115 3/29/11 B 3.4.7 Revision 115 3129/11 B 3.4.8 Revision 115 3/29/11 B 3.4.9 Revision 115 3/29/11 B 3.4.10 Revision 102 8/17/09 B 3.4.11 Revision 115 3/29/11 B 3.4.12 Revision 115 3/29/11 B 3.4.13 Revision 115 3/29/11 B 3.4.14 Revision 115 3/29/11 B 3.4.15 Revision 115 3/29/11 B 3.4.16 Revision 121 8/5/09 B 3.4.17 Revision 115 3/29/11 B 3.4.18 Revision 86 6/25/07 B 3.5.1 Revision 115 3/29/11 B 3.5.2 Revision 116 8/18/11 B 3.5.3 Revision 57 4/29/04 B 3.5.4 Revision 122 10/25/12 B 3.5.5 Revision 115 3/29/11 B 3.6.1 Revision 53 2/17/04 B 3.6.2 Revision 115 3/29/11 B 3.6.3 Revision 115 3/29/11 B 3.6.4 Revision 115 3/29/11 B 3.6.5 Revision 115 3/29/11 B 3.6.6 Revision 122 10/25/12 B 3.6.7 Not Used -Revision 63 4/4/05 B 3.6.8 Revision 115 3/29/11 23.6.9 Revision 115 3/29/11 B 3.6.10 Revision 120 4/26/12 B 3.6.11 Revision 122 10/25/12 B 3.6.12 Revision 115 3/29/11 B 3.6.13 Revision 115 3/29/11 B 3.6.14 Revision 115 3/29/11 B 3.6.15 Revision 115 3/29/11 B 3.6.16 Revision 115 3/29/11 McGuire Units I and 2 Page 2 Revision 113 Page Number Amendment Revision Date B 3.7.1 Revision 102 8/17/09 B 3.7.2 Revision 105 2/22/10 B 3.7.3 Revision 102 8/17/09 B 3.7.4 Revision 115 3/29/11.B 3.7.5 Revision 115 3/29/11 B 3.7.6 Revision 115 3/29/11 B 3.7.7 Revision 115 3/29/11 B 3.7.8 Revision 115 3/29/11 B 3.7.9 Revision 120 4/26/12 B 3.7.10 Revision 115 3/29/11 B 3.7.11 Revision 115 3/29/11 B 3.7.12 Revision 115 13/29/11 B 3.7.13 Revision 115 3/29/11 B 3.7.14 Revision 115 3/29/11 B 3.7.15 Revision 66 6/30/05 B 3.7.16 Revision 115 3/29/11 B 3.8.1 Revision 115 3/29/11 B 3.8.2 Revision 92 1/28/08 B 3.8.3 Revision 123 9/29/12 B 3.8.4 Revision 115 3/29/11 B 3.8..5 Revision 41 7/29/03 B 3.8.6 Revision 115 3/29/11 B 3.8.7 Revision 115 3/29/11 B 3.8.8 Revision 115 3/29/11 B 3.8.9 Revision 115 3/29/11 B 3.8.10 Revision 115 3/29/11 B 3.9.1 Revision 115 3/29/11 B 3.9.2 Revision 115 3/29/11 B 3.9.3 Revision 115 3129111 B 3.9.4 Revision 115 3/29/11 B 3.9.5 Revision 115 3/29/11 B 3.9.6 Revision 115 3/29/11 B 3.9.7 Revision 115 3/29/11 McGUire Units 1 and 2 Page 3 Revision 113 RTS Instrumentation B 3.3.1 B 3.3 INSTRUMENTATION B 3.3.1 Reactor Trip System (RTS) Instrumentation BASES BACKGROUND The RTS initiates a unit shutdown, based on the values of selected unit parameters, to protect against violating the core fuel design limits and Reactor Coolant System (RCS) pressure boundary during anticipated operational occurrences (AOOs) and to assist the Engineered Safety Features (ESF) Systems in mitigating accidents.
The protection and monitoring systems have been designed to assure safe operation of the reactor. This is achieved by specifying limiting safety system settings (LSSS) in terms of parameters directly monitored by the RTS, as well as specifying LCOs on other reactor system parameters and equipment performance.
The LSSS, defined in this specification as the Allowable Values, in conjunction with the LCOs, establish the threshold for protective system action to prevent exceeding acceptable limits during Design Basis Accidents (DBAs).During AOOs, which are those events expected to occur one or more times during the unit life, the acceptable limits are: 1. The Departure from Nucleate Boiling Ratio (DNBR) shall be maintained above the Safety Limit (SL) value to prevent departure from nucleate boiling (DNB);2. Fuel centerline melt shall not occur; and 3. The RCS pressure SL of 2735 psig shall not be exceeded.Operation within the SLs of Specification 2.0, "Safety Limits (SLs)," also maintains the above values and assures that offsite dose will be within the 10 CFR 20 and 10 CFR 100 criteria during AOOs.Accidents are events that are analyzed even though they are not expected to occur during the unit life. The acceptable limit during accidents is that offsite dose shall be maintained within an acceptable fraction of 10 CFR 100 limits. Different accident categories are allowed a different fraction of these limits, based on probability of occurrence.
Meeting the acceptable dose limit for an accident category is considered having acceptable consequences for that event.McGuire Units 1 and 2 B 3.3. 1-1 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued)
The RTS instrumentation is segmented into four distinct but interconnected categories as illustrated in UFSAR, Chapter 7 (Ref. 1), and as identified below: 1. Field transmitters or process sensors: provide a measurable electronic signal based upon the physical characteristics of the parameter being measured;2. Process monitoring systems, including the Process Control System, the Nuclear Instrumentation System (NIS), and various field contacts and sensors: monitors various plant parameters, provides any required signal processing, and provides digital outputs when parameters exceed predetermined limits. They may also provide outputs for control, indication, alarm, computer input, and recording;
- 3. Solid State Protection ,System (SSPS), including input, logic, and output bays: combines the input signals from the process monitoring systems per predetermined logic and initiates a reactor trip and ESF actuation when warranted by the process monitoring systems inputs; and 4. Reactor trip switchgear, including reactor trip breakers (RTBs) and bypass breakers:
provides the means to interrupt power to the control rod drive mechanisms (CRDMs) and allows the rod cluster control assemblies (RCCAs), or "rods," to fall into the core and shut down the reactor. The bypass breakers allow testing of the RTBs at power.Field Transmitters or Sensors To meet the design demands for redundancy and reliability, more than one, and often as many as four, field transmitters or sensors are used to measure unit parameters.
To account for the calibration tolerances and instrument drift, which are assumed to occur between calibrations, statistical allowances are provided NOMINAL TRIP SETPOINT Values.The OPERABILITY of each transmitter or sensor can be evaluated when its "as found" calibration data are compared against its documented acceptance criteria.McGuire Units 1 and 2 B 3.3.1-2 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued)
Process Monitoring Systems Generally, three or four channels of process control equipment are used for the signal processing of unit parameters measured by the field instruments.
The process control equipment provides signal conditioning, compatible output signals for instruments located on the main control board, and comparison of measured input signals with setpoints established by safety analyses.
These setpoints are defined in UFSAR, Chapter 7 (Ref. 1), Chapter 6 (Ref. 2), and Chapter 15 (Ref. 3). If the measured value of a unit parameter exceeds the predetermined setpoint, an output from a bistable is forwarded to the SSPS for decision logic processing.
Channel separation is maintained up to and through the input bays. However, not all unit parameters require four channels of sensor measurement and signal processing.
Some unit parameters provide input only to the SSPS, while others provide input to the SSPS, the main control board, the unit computer, and one or more control systems.Generally, if a parameter is used only for input to the protection circuits, three channels with a two-out-of-three logic are sufficient to provide the required reliability and redundancy.
If one channel fails in a-direction that would not result in a partial Function trip, the Function is still OPERABLE with a two-out-of-two logic. If one channel fails, such that a partial Function trip occurs, a trip will not occur and the Function is still OPERABLE with a one-out-of-two logic.Generally, if a parameter is used for input to the SSPS and a control function, four channels with a two-out-of-four logic are sufficient to provide the required reliability and redundancy.
The circuit must be able to withstand both an input failure to the control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
Again, a single failure will neither cause nor prevent the protection function actuation.
These requirements are described in IEEE-279-1971 (Ref. 4). The actual number of channels required for each unit parameter is specified in Reference 1.Two logic channels are required to ensure no single random failure of a logic channel will disable the RTS. The logic channels are designed such that testing required while the reactor is at power may be accomplished without causing a trip. Provisions to allow removing logic channels from service during maintenance are unnecessary because of the logic system's designed reliability.
McGuire Units 1 and 2 B 3.3.1-3 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND
.(continued)
Trip Setpoints and Allowable Values The NOMINAL TRIP SETPOINTS are the nominal values at which the bistables are set. Any bistable is considered to be properly adjusted when the "as left" value is within the bandfor CHANNEL CALIBRATION tolerance.
The NOMINAL TRIP SETPOINTS used in the bistables are based on the analytical limits (Ref. 1, 2, and 3). The selection of these NOMINAL TRIP SETPOINTS is such that adequate protection is provided when all sensor and processing time delays, calibration tolerances, instrumentation uncertainties, instrument drift, and severe environment errors for those RTS channels that must function in harsh environments as defined by 10 CFR 50.49 (Ref. 5) are taken into account. The actual as-left Setpoint of the bistable assures that the actual trip occurs in time to prevent an analytical limit from being exceeded.The Allowable Value accounts for changes in random measurement errors between COTs. One example of such a change in measurement error is drift during the surveillance interval.
If the COT demonstrates that the loop trips within the Allowable Value, the loop is OPERABLE.
A trip within the Allowable Value ensures that the predictions of equipment performance used to develop the NOMINAL TRIP SETPOINT are still valid, and that the equipment will initiate a trip in response to an AOO in time to prevent an analytical limit from being exceeded (and that the consequences of DBAs will be acceptable, providing the unit is operated from within the LCOs at the onset of the AOO or DBA, and the equipment functions as designed).
Note that in the accompanying LCO 3.3.1, the Allowable Values of Table 3.3.1-1 are the LSSS.Each channel of the process control equipment can be tested on line to verify that the signal or setpoint accuracy is within the specified allowance requirements.
Once a designated channel is taken out of service for testing, a simulated signal is injected in place of the field instrument signal. The process equipment for the channel in test is then tested, verified, and calibrated.
SRs for the channels are specified in the SRS section.Determination of the NOMINAL TRIP SETPOINTS and Allowable Values listed in Table 3.3.1-1 incorporate all of the known uncertainties applicable for each channel. The magnitudes of these uncertainties are-factored into the determination of each NOMINAL TRIP SETPOINT.
All field sensors and signal processing equipment for these channels are assumed to operate within the allowances of these uncertainty magnitudes.
McGuire Units 1 and 2 I B 3.3.1-4 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued)
Solid State Protection System The SSPS equipment is used for the decision logic processing of outputs from the signal processing equipment bistables.
To meet the redundancy requirements, two trains of SSPS, each performing the same functions, are provided.
If one train is taken out of service for maintenance or test purposes, the second train will provide reactor trip and/or ESF actuation for the unit. If both trains are taken out of service or placed in test, a reactor trip will result. Each train is packaged in its own cabinet for physical and electrical separation to satisfy separation and independence requirements.
The system has been designed to trip the reactor in the event of a loss of power, directing the unit to a safe shutdown condition.
The SSPS performs the decision logic for actuating a reactor trip or ESF actuation, generates the electrical output signal that will initiate the required trip or actuation, and provides the status, permissive, and annunciator output signals to the main control room of the unit.The outputs from the process monitoring systems are sensed by the SSPS equipment and combined into logic matrices that represent combinations indicative of various unit upset and accident transients.
If a logic matrix combination is completed, the system will initiate a reactor trip or send actuation signals via master and slave relays to those components whose aggregate Function best serves to alleviate the condition and restore the unit to a stable condition.
Examples are given in the Applicable Safety Analyses, LCO, and Applicability sections of this Bases.Reactor Trip Switchcqear The RTBs are in the electrical power supply line from the control rod drive motor generator set power supply to the CRDMs. Opening of the RTBs interrupts power to the CRDMs, which allows the shutdown rods and control rods to fall into the core by gravity. Each RTB is equipped with a bypass breaker to allow testing of the RTB while the unit is at power.During normal operation the output from the SSPS is a voltage signal that energizes the undervoltage coils in the RTBs and bypass breakers, if in use. When the required logic matrix combination is completed, the SSPS output voltage signal is removed, the undervoltage coils are de-energized, the breaker trip lever is actuated by a compressed spring that is released by de-energizing the undervoltage coil, and the RTBs and bypass breakers are tripped open. This allows the shutdown rods and control rods to fall into the core. In addition to the de-energization of the McGuire Units 1 and 2 B 3.3.1-5 Revision No. 124 RTS Instrumentation B 3.3.1 BASES BACKGROUND (continued) undervoltage coils, each breaker is also equipped with a shunt trip device that is energized to trip the breaker open upon receipt of a reactor trip signal from the SSPS. Either the undervoltage coil or the shunt trip mechanism is sufficient by itself, thus providing a diverse trip mechanism.
The decision logic matrix Functions are described in the functional diagrams included in Reference
- 1. In addition to the reactor trip or ESF, these diagrams also describe the various "permissive interlocks" that are associated with unit conditions.
Each train has a built in testing device that can test the decision logic matrix Functions and the actuation devices while the unit is at power. When any one train is taken out of service for testing, the other train is capable of providing unit monitoring and protection until the testing has been completed.
The testing device is semiautomatic to minimize testing time.APPLICABLE The RTS functions to maintain the SLs during all AQOs and mitigates SAFETY ANALYSES,the consequences of DBAs in all MODES in which the RTBs are closed.LCO, and APPLICABILITY Each of the analyzed accidents and transients can be detected by one or more RTS Functions.
The accident analysis described in Reference 3 takes creditfor most RTS trip Functions.
RTS trip Functions not specifically credited in the accident analysis are qualitatively credited in the safety analysis and the NRC staff approved licensing basis for the unit. These RTS trip Functions may provide protection for conditions that do not require dynamic transient analysis to demonstrate Function performance.
They may also serve as backups to RTS trip Functions that were credited in the accident analysis.The LCO requires all instrumentation performing an RTS Function, listed in Table 3.3.1-1 in the accompanying LCO, to be OPERABLE., Failure of any instrument renders the affected channel(s) inoperable and reduces the reliability of the affected Functions.
The LCO generally requires OPERABILITY of three or four channels in each instrumentation Function, two channels of Manual Reactor Trip in each logic Function, and two trains in each Automatic Trip Logic Function.Four OPERABLE instrumentation channels in a two-out-of-four configuration are required when one RTS channel is also used as a control system input. This configuration accounts for the possibility of the shared channel failing in such a manner that it creates a transient that requires RTS action. In this case, the RTS will still provide protection, McGuire Units 1 and 2 B 3.3.1-6 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) even with random failure of one of the other three protection channels.Three operable instrumentation channels in a two-out-of-three configuration are generally required when there is no potential for control system and protection system interaction that could simultaneously create a need for RTS trip and disable one RTS channel..
The two-out-of-three and two-out-of-four configurations allow one channel to be tripped during maintenance or testing without causing a reactor trip. Specific exceptions to the above general philosophy exist and are discussed below.Reactor Trip System Functions The safety analyses and OPERABILITY requirements applicable to each RTS Function are discussed below: 1. Manual Reactor Trip The Manual Reactor Trip ensures that the control room operator can initiate a reactor trip at any time by using either of two reactor trip switches in the control room. A Manual Reactor Trip accomplishes the same results as any one of the automatic trip Functions.
It may be used by the reactor operator to shut down the reactor whenever any parameter is rapidly trending toward its Trip Setpoint.The LCO requires two Manual Reactor Trip channels to be OPERABLE.
Each channel is controlled by a manual reactor trip switch. 'Each channel actuates one or more reactor trip breakers in, both trains. Two independent channels are required to be, OPERABLE so that no single random failure will disable the Manual Reactor Trip Function.In MODE 1 or 2, manual initiation of a reactor trip must be OPERABLE.
These are the MODES in which the shutdown rods and/or control rods are partially or fully withdrawn from the core. In MODE 3, 4, or 5, the manual initiation Function must also be OPERABLE if the shutdown rods or control rods are withdrawn or the Control Rod Drive (CRD) System is capable of withdrawing the shutdown rods or the control rods. In this condition, inadvertent control rod withdrawal is possible.
In MODE 3, 4, or 5, manual initiation of a reactor trip does not have to be OPERABLE if the CRD System is not capable of withdrawing the shutdown rods or control rods. If the rods cannot be withdrawn from the core, there McGuire Units 1 and 2 B 3.3.1-7 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) is no need to be able to trip the reactor because all of the rods are inserted.
In MODE 6, the CRDMs are disconnected from the control rods and shutdown rods. Therefore, the manual initiation Function is not required.2. Power Range Neutron Flux The NIS power range detectors are located external to the reactor vessel and measure neutrons leaking from the core. The NIS power range detectors provide input to the Rod Control System and the Steam Generator (SG) Water Level Control System. Therefore, the actuation logic must be able to withstand an input failure to the control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
Note that this Function also provides a signal to prevent! automatic and manual rod withdrawal prior to initiating a reactor trip. Limiting further rod withdrawal may terminate the transient and eliminate the need to trip the reactor.a. Power Range Neutron Flux-Hiqgh The Power Range Neutron Flux-High trip Function ensures that protection is provided, from all power levels, against a positive reactivity excursion leading to DNB during power operations.
These can be caused by rod withdrawal or reductions in RCS temperature.
The LCO requires all four of the Power Range Neutron Flux-High channels to be OPERABLE.In MODE 1 or 2, when a positive reactivity excursion could occur, the Power Range Neutron Flux-High trip must be OPERABLE.
This Function will terminate the reactivity excursion and shut down the reactor prior to reaching a power level that could damage the fuel. In MODE 3, 4, 5, or 6, the NIS power range detectors cannot detect neutron levels in this range. In these MODES, the Power Range Neutron Flux-High does not have to be OPERABLE because the reactor is shut down and reactivity excursions into the power range are extremely unlikely.
Other RTS Functions and administrative controls provide protection against reactivity additions when in MODE 3, 4, 5, or 6.McGuire Units 1 and 2 B 3.3.1-8 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO and APPLICABILITY (continued)
- b. Power Range Neutron Flux-Low The LCO requirement for the Power Range Neutron Flux-Low trip Function ensures that protection is provided against a positive reactivity excursion from low power or subcritical conditions.
The LCO requires all four of the Power Range Neutron Flux-Low channels to be OPERABLE.In MODE 1, below the Power Range Neutron Flux (P-10 setpoint), and in MODE 2, the Power Range Neutron Flux-Low trip must be OPERABLE.
This Function may be manually blocked by the operator when two out of four power range channels are greater than approximately 10% RTP (P-10 setpoint).
This Function is automatically unblocked when three out of four power range channels are below the P-10 setpoint.
Above the P-10 setpoint, positive reactivity additions are mitigated by the Power Range Neutron Flux-High trip Function.In MODE 3, 4, 5, or 6, the Power Range Neutron Flux-Low trip Function does not have to be OPERABLE because the reactor is shut down and the NIS power range detectors cannot detect neutron levels in this range. Other RTS trip Functions and administrative controls provide protection against positive reactivity additions or power excursions in MODE 3, 4, 5, or 6.3. Power Rangqe Neutron Flux-Hicqh Positive Rate The Power Range Neutron Flux -High Positive Rate trip uses the same channels as discussed for Function 2 above.The Power Range Neutron Flux-High Positive Rate trip Function ensures that protection is provided against rapid increases in neutron flux that are characteristic of an RCCA drive rod housing rupture and the accompanying ejection of the RCCA. This Function complements the Power Range Neutron Flux-High and Low Setpoint trip Functions to ensure that the criteria are met for a rod ejection from the power range.The LCO requires all four of the PowerRange Neutron Flux-High Positive Rate channels to be OPERABLE.McGuire Units 1 and 2 B 3.3.1-9 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
In MODE 1 or 2, when there is a potential to add a large amount'of positive reactivity from a rod ejection accident (REA), the Power Range Neutron Flux---High Positive Rate trip must be OPERABLE.In MODE 3, 4, 5, or 6, the Power Range Neutron Flux-High Positive,.Rate trip Function does not have to be OPERABLE because other RTS trip Function's and administrative controls will provide protection against positive 'reactivity additions.
In MODE 6, no rods are withdrawn.
and the SDM is increased during refueling operations.
The reactor vessel head is also removed or the closure bolts are detensioned preventing any pressure buildup. In addition, the NIS power range detectors'cannot detect neutron levels present in this mode.4A. Intermediate Range Neutron Flux (Westingihouse-supplied, Instrumentation)
The Westinghouse-supplied Intermediate Range excore detector systems (utilizing compensated ion chamber detectors) are being replaced With Thermo Scientific-supplied 300i neutron flux, monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Westinghouse-supplied instrumentation..
The next section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The Intermediate Range Neutron Fluxltrip Function ensures that* protection
'is provided against an uncontrolled RCCA bank rod withdrawal accident from a subcritical condition during startup. This trip Function provides redundant protection to the Power Range Neutron Flux-Low Setpoint trip Function.
The NIS intermediate.
range detectors are located external to the reactor vessel and measure neutrons leaking from the core. Note that this Function also provides a signal to prevent automatic and manual rod withdrawal prior to initiating.a reactor trip. Limiting further rod withdrawal may terminate the transient and eliminate the need to trip the reactor.The LCO requires two channels of Intermediate Range Neutron'Flux to be OPERABLE.
Two OPERABLE channels are sufficient to ensure no single random failure will disable this trip Function..
Because this trip Function is important only during startup,, there is generally no need to disable channels for testing while the Function is required to be OPERABLE., Therefore, a third channel is , ..'unnecessary. McGuire Units 1 and 2 B 3.3.1-10 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
In MODE 1 below the P-10 setpoint, and in MODE 2, when there is a potential for an uncontrolled RCCA bank rod withdrawal accident during reactor startup, the Intermediate Range Neutron Flux trip must be OPERABLE.
Above the P-10 setpoint, the Power Range Neutron Flux-High Setpoint trip and the Power Range Neutron Flux-High Positive Rate trip provide core protection for a rod withdrawal accident.
In MODE 3,A4, or 5, the Intermediate Range Neutron Flux trip does not have to be OPERABLE because other RTS trip functions provide protection against positive reactivity additions.
The reactor cannot be started up in this condition.
The core also has the required SDM to mitigate the consequences of a positive reactivity addition accident.
In MODE 6, all rods are fully inserted and the core has a required increased SDM. Also, the NIS intermediate range detectors cannot detect neutron levels present in this MODE.4B. Intermediate Range Neutron Flux (Thermo Scientific-supplied Instrumentation)
The Westinghouse-supplied Intermediate Range excore detector systems (utilizing compensated ion chamber detectors) are being replaced with Thermo Scientific-supplied 300i neutron flux monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The previous section of the Bases applies to the Westinghouse-supplied instrumentation.
The Intermediate Range Neutron Flux trip Function ensures that protection is provided against an uncontrolled RCCA bank rod withdrawal accident from a subcritical condition during startup. This trip Function provides redundant protection to the Power Range Neutron Flux-Low Setpoint trip Function.
The NIS intermediate range detectors are located external to the reactor vessel and measure neutrons leaking from the core. Note that this Function also provides a signal to prevent automatic and manual rod withdrawal prior to initiating a reactor trip. Limiting further rod withdrawal may terminate the transient and eliminate the need to trip the reactor.The LCO requires two channels of Intermediate Range Neutron Flux to be OPERABLE.
Two OPERABLE channels are sufficient to ensure no single random failure will disable this trip Function.Because this trip Function is important only during startup, there is generally no need to disable channels for testing while the Function McGuire Units 1 and 2 B 3.3.1-11 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) is required to be OPERABLE.
Therefore, a third channel is unnecessary.
In MODE 1 below the P-10 setpoint, and in MODE 2, when there is a potential for an uncontrolled RCCA bank rod withdrawal accident during reactor startup, the Intermediate Range Neutron Flux trip must be OPERABLE.
Above the P-10 setpoint, the Power Range Neutron Flux-High Setpoint trip and the Power Range Neutron Flux-High Positive Rate trip provide core protection for a rod withdrawal accident.
In MODE 3, 4, or 5, the Intermediate Range Neutron Flux trip does not have to be OPERABLE because other RTS trip functions provide protection against positive reactivity additions.
The reactor cannot be started up in this condition.
The core also has the required SDM to mitigate the consequences of a positive reactivity addition accident.
In MODE 6, all rods are fully inserted and the core has a required increased SDM.5A. Source Range Neutron Flux (Westingqhouse-supplied Instrumentation)
The Westinghouse-supplied Source Range excore detector systems (utilizing boron triflouride detectors) are being replaced with Thermo Scientific-supplied 300i neutron flux monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Westinghouse-supplied instrumentation.
The next section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The LCO requirement for the Source Range Neutron Flux trip Function ensures that protection is provided against an uncontrolled RCCA bank rod withdrawal accident from a subcritical condition during startup. This trip Function provides redundant protection to the Power Range Neutron Flux-Low Setpoint and Intermediate Range Neutron Flux trip Functions.
In MODES 3, 4, and 5, administrative controls also prevent the uncontrolled withdrawal of rods. The NIS source range detectors are located external to the reactor vessel and measure neutrons leaking from the core. The NIS source range detectors do not provide any inputs to control systems. The source range trip is the only RTS automatic protection function required in MODES 3, 4, and 5 with the CRD System capable of rod withdrawal.
Therefore, the functional capability at the specified Trip Setpoint is assumed to be available.
McGuire Units 1 and 2 133.3.1-12 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO,'and APPLICABILITY (continued)
The LCO requires two channels of Source Range Neutron Flux to be OPERABLE.
Two OPERABLE channels are sufficient to ensure no single random failure will disable this trip Function.
The LCO also requires one channel of the Source Range Neutron Flux to be OPERABLE in MODE 3, 4, or 5 with RTBs open. In this case, the source range Function is to provide control room indication.
The outputs of the Function to RTS logic are not required OPERABLE when the RTBs are open.The Source Range Neutron Flux Function provides protection for control rod withdrawal from subcritical, boron dilution, and control rod ejection events. The Function also provides visual neutron flux indication in the control room.In MODE 2 when below the P-6 setpoint during a reactor startup, the Source Range Neutron Flux trip must be OPERABLE.
Above the P-6 setpoint, the Intermediate Range Neutron Flux trip and the Power Range Neutron Flux-Low Setpoint trip will provide core'protection for reactivity accidents.
Above the P-6 setpoint, the NIS source range detectors are de-energized and inoperable.
In MODE 3, 4, or 5 with the reactor shut down, the Source Range Neutron Flux trip Function must also be OPERABLE.
If the CRD System is capable of rod withdrawal, the Source Range Neutron Flux trip must be OPERABLE to provide core protection against a rod withdrawal accident.
If the unit is to be in MODE 3 with the RTBs closed for > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> the Surveillance requirement SR'3.3.1.7 must be completed within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after entry into MODE 3. The.surveillance shall 'include verification of the high flux at shutdown alarm setpoint of less than or equal to five times background of the average CPS Neutron Level Reading (the average CPS Reading is the most consistent value between highest and lowest CPS Neutron Level Reading).If the CRD System is not capable of rod withdrawal, the source range detectors are not required to trip the reactor. However, their monitoring Function must be OPERABLE to monitor core neutron levels and provide indication of reactivity changes that may occur as a result of events like a boron dilution.The neutron detector's high flux at shutdown alarm setpoint of less than or equal to five times background, in Mode 3, 4, or 5, shall be verified.
Once the High Flux at Shutdown Alarm setpoints are set at five times background above steady state neutron count rate the re-verification/re-adjustment of the high flux at shutdown is not required.
The neutron count rate will decrease as Mode changes McGuire Units 1 and 2 B 3.3.1-13 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) are made from 3 to 4 to 5 as the system temperature decreases.
Any subsequent changes in the count rate are an indication of gamma flux (due to movement of irradiated particles in the system)which may cause the source range response to vary. Upon increase in the neutron count rate due to activities that add positive reactivity to the core, the presence of gamma flux will cease to be a factor in detector count rate.A CHANNEL CHECK provides a comparison of the parameter indicated on one channel to a similar parameter on other channels.This is based on the assumption that the two indicating channels should be consistent.
Significant differences between the indicating source range channels can occur due to core geometry, decreasing neutron count rate as temperature is decreasing in the system, the location of the Source Assemblies (distance from the Source Detectors), and large amounts of gamma. Each channel should be consistent with its local condition.
The requirements for the NIS source range detectors in MODE 6 are addressed in LCO 3.9.3, "Nuclear Instrumentation." 5B. Source Ranqe Neutron Flux (Thermo Scientific-supplied Instrumentation)
The Westinghouse-supplied Source Range excore detector systems (utilizing boron triflouride detectors) are being replaced with Thermo Scientific-supplied 300i neutron flux monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The previous section of the Bases applies to the Westinghouse-supplied instrumentation.
The LCO requirement for the Source Range Neutron Flux trip Function ensures that protection is provided against an uncontrolled RCCA bank rod withdrawal accident from a subcritical condition during startup. This trip Function,-provides redundant protection to the Power Range Neutron Flux-Low Setpoint and Intermediate Range Neutron Flux trip Functions.
In MODES 3, 4, and 5, administrative controls also prevent the uncontrolled withdrawal of rods. The NIS source range detectors are located external to the reactor vessel and measure neutrons leaking from the core. The NIS source range detectors do not provide any inputs to control systems. The source range trip is the only RTS automatic protection function required in MODES 3, 4, and 5 with the CRD System capable of rod withdrawal.
Therefore, the McGuire Units 1 and 2 B 3.3.1-14 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) functional capability at the specified Trip Setpoint is assumed to be available.
The LCO requires two channels of Source Range Neutron Flux to be OPERABLE.
Two OPERABLE channels are sufficient to ensure no single random failure will disable this trip Function.
The LCO also requires one channel of the Source Range Neutron Flux to be OPERABLE in MODE 3, 4, or 5 with RTBs open. In this case, the source range Function is to provide control room indication.
The outputs of the Function to RTS logic are not required OPERABLE when the RTBs are open.The Source Range Neutron Flux Function provides protection for control rod withdrawal from subcritical, boron dilution, and control rod ejection events. The Function also provides visual neutron flux indication in the control room.In MODE 2 when below the P-6 setpoint during a reactor startup, the Source Range Neutron Flux trip must be OPERABLE.
Above the P-6 setpoint, the Intermediate Range Neutron Flux trip and the Power Range Neutron Flux-Low Setpoint trip will provide core protection for reactivity accidents.
Above the P-6 setpoint, the Source Range Neutron Flux trip is blocked.In MODE 3, 4, or 5 with the reactor shut down, the Source Range Neutron Flux trip Function must also be OPERABLE.
If the CRD System is capable of rod withdrawal, the Source Range Neutron Flux trip must be OPERABLE to provide core protection against a rod withdrawal accident.
If the unit is to be in MODE 3 with the RTBs closed for > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> the Surveillance requirement SR 3.3.1.7 must be completed within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after entry into MODE 3.If the CRD System is not capable of rod withdrawal, the source range detectors are not required to trip the reactor. However, their monitoring Function must be OPERABLE to monitor core neutron levels and provide indication of reactivity changes that may occur as a result of events like a boron dilution.A CHANNEL CHECK provides a comparison of the parameter indicated on one channel to a similar parameter on other channels.This is based on the assumption that the two indicating channels should be consistent.
Significant differences between the indicating source range channels can occur due to core geometry, decreasing neutron count rate as temperature is decreasing in the system, the location of the Source Assemblies (distance from the Source McGuire Units 1 and 2 B 3.3.1-15 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Detectors), and large amounts of gamma. Each channel should be consistent with its local condition.
The requirements for the NIS source range detectors in MODE 6 are addressed in LCO 3.9.3, "Nuclear Instrumentation." 6. Overtemperature AT The Overtemperature AT trip Function is provided to ensure that the design limit DNBR is met. This trip Function also limits the range over which the Overpower AT trip Function must provide protection.
The inputs to the Overtemperature AT trip include pressurizer pressure, coolant temperature, axial power distribution, and reactor power as indicated by loop AT assuming full reactor coolant flow. Protection from violating the DNBR limit is assured for those transients that. are slow with respect to delays from the core to the measurement system. The Function monitors both variation in power and flow since a decrease in flow has the same effect on AT as a power increase.
The Overtemperature AT trip Function uses each loop's AT as a measure of reactor power and is compared with a setpoint that is automatically varied with the following parameters:
reactor coolant average temperature-the Trip Setpoint is varied to correct for changes in coolant density and specific heat capacity with changes in coolant temperature; pressurizer pressure-the Trip Setpoint is varied.to correct for changes in system pressure; and axial power distribution-f(AI), the Trip Setpoint is varied to account for imbalances in the axial power distribution as detected by the NIS upper and lower power range detectors.
If axial peaks are greater than the design limit, as indicated by the difference between the upper and lower NIS power range detectors, the Trip Setpoint is reduced in accordance with Note 1 of Table 3.3.1-1.Dynamic compensationis included for system piping delays from the core to the temperature measurement system.The Overtemperature AT trip Function is calculated for each loop as described in Note 1 of Table 3.3.1-1. Trip occurs if Overtemperature AT is indicated in two loops. The pressure and temperature signals are used for other control functions, therefore, the actuation logic must be able to withstand an input failure to the McGuire Units 1 and 2 B 3.3.1-16 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) control system, which may then require the protection function actuation, and a single failure in'the other channels providing the protection function actuation.
Note that this Function also provides a signal to generate a turbine runback prior to reaching the Trip Setpoint.
A turbine runback will reduce turbine power and reactor power. A reduction in power will normally alleviate.
the Overtemperature AT condition and may prevent a reactor trip.The LCO requires all four channels of the Overtemperature AT trip Function to be OPERABLE.
Note that the Overtemperature AT Function receives input from channels shared with other RTS Functions.
Failures that affect multiple Functions require entry into the Conditions applicable to all affected Functions.
In MODE 1 or 2, the Overtemperature AT trip must be OPERABLE to prevent DNB. In MODE 3, 4, 5, or 6, this trip Function does not have to be OPERABLE because the reactor is not operating and there is insufficient heat production to be concerned about DNB.7. Overpower AT The Overpower AT trip Function ensures that protection is provided to ensure the integrity of the fuel (i.e., no fuel pellet melting and less than 1% cladding strain) under all possible overpower conditions.
This trip Function also limits the required range of the Overtemperature AT trip Function and provides a backup to the Power Range Neutron Flux-High Setpoint trip. The Overpower AT trip Function ensures that the allowable heat generation rate (kW/ft)of the fuel is not exceeded.
It uses the AT of each loop as a measure of reactor power with a setpoint that is automatically varied with the following parameters:
- reactor coolant average temperature-the Trip Setpoint is varied to correct for changes in coolant density and specific heat capacity with changes in coolant temperature; and* rate of change of reactor coolant average temperature-including dynamic compensation for the delays between the core and the temperature measurement system.The Overpower AT trip Function is calculated for each loop as per Note 2 of Table 3.3.1-1. Trip occurs if Overpower AT is indicated in two loops. The temperature signals are used for other control functions, therefore, the actuation logic must be able to withstand an input failure to the control system; which may then require the McGuire Units 1 and 2 B 3.3.1-17 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) protection function actuation, and a single failure in the remaining channels providing the protection function actuation.
Note-that this Function also provides a signal to generate a turbine runback prior to reaching the Trip Setpoint.
A turbine runback will reduce turbine power and reactor power. A reduction in power will normally.alleviate the Overpower AT condition and may prevent a reactor trip.The LCO requires four channels of the Overpower AT trip Function to be OPERABLE.
Note that the Overpower AT trip Function receives input from channels shared with other RTS Functions.
Failures that affect multiple Functions require entry into the Conditions applicable to all affected Functions.
In MODE 1 or 2, the Overpower AT trip Function must be OPERABLE.
These are the only times that enough heat is generated in the fuel to be concerned about the heat generation rates and overheating of the fuel. In MODE 3, 4, 5, or 6, this trip Function does not have to be OPERABLE because the reactor is not operating and there is insufficient heat production to be concerned about fuel overheating and fuel damage.8. Pressurizer Pressure The same sensors provide input to the Pressurizer Pressure-High and -Low trips and the Overtemperature AT trip. The Pressurizer Pressure channels are also used to provide input to the Pressurizer Pressure Control System, therefore, the actuation logic must be able to withstand an input failure to the control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
McGuire Units 1 and 2 B 3.3.1-18 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- a. Pressurizer Pressure-Low The Pressurizer Pressure-Low trip Function ensures that protection is provided against violating the DNBR limit due to low pressure.The LCO requires four channels of Pressurizer Pressure-.
Low to be OPERABLE: In MODE 1, when DNB is a major concern, the Pressurizer Pressure-Low trip must be OPERABLE.
This trip Function is automatically enabled on increasing power by the P-7 interlock (NIS power range P-10 or turbine inlet pressure greater than approximately 10% of full power equivalent (P-1 3)). On decreasing power, this trip Function is automatically blocked below P-7. Below the P-7 setpoint, power distributions that would cause DNB concerns are unlikely.b. Pressurizer Pressure-Hiqh The Pressurizer Pressure-High trip Function ensures that protection is provided against overpressurizing the RCS.This trip Function operates in conjunction with the pressurizer relief and safety valves to prevent RCS overpressure conditions.
The LCO requires four channels of the Pressurizer Pressure-High to be OPERABLE.The Pressurizer Pressure-High LSSS is selected to be below the pressurizer safety valve actuation pressure and above the power operated relief valve (PORV) setting. This setting minimizes challenges to safety valves while avoiding unnecessary reactor trips for those pressure increases that can be controlled by the PORVs.In MODE 1 or.2, the Pressurizer Pressure-High trip must be OPERABLE to help prevent RCS overpressurization and minimize challenges to the safety valves. In MODE 3, 4, 5, or 6, the Pressurizer Pressure-High trip Function does not have to be OPERABLE because transients that could cause an overpressure condition will be slow to occur. Therefore, the operator will have sufficient time to evaluate unit McGuire Units 1 and 2 B 3.3.1-19 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) conditions and take corrective actions. Additionally, low temperature overpressure protection systems provide overpressure protection when below MODE 4.9. Pressurizer Water Level-High The Pressurizer Water Level-High trip Function provides a backup signal for the Pressurizer Pressure-High trip and also provides protection against water relief through the pressurizer safety valves.These valves are designed to pass steam in order to achieve their design energy removal rate. A reactor trip is actuated prior to the pressurizer becoming water solid. The setpoints are based on percent of instrument span. The LCO requires three channels of Pressurizer Water Level-High to be OPERABLE.
The pressurizer level channels are used as input to the Pressurizer Level Control System. A fourth channel is not required to address control/protection interaction concerns.
The level channels do not actuate the safety valves, and the high pressure reactor trip is set below the safety valve setting. Therefore, with the slow rate of charging available, pressure overshoot due to level channel failure cannot cause the safety valve to lift before reactor high pressure trip.In MODE 1, when there is a potential for overfilling the pressurizer, the Pressurizer Water Level-High trip must be OPERABLE.
This trip Function is automatically enabled on increasing power by the P-7 interlock.
On decreasing power, this trip Function is automatically blocked below P-7. Below the P-7 setpoint, transients that could raise the pressurizer water level will be slow and the operator will have sufficient time to evaluate unit conditions and take corrective actions.10. Reactor Coolant Flow-Low a. Reactor Coolant Flow-Low (Single Loop)The Reactor Coolant Flow-Low (Single Loop) trip Function ensures that protection is provided against violating the DNBR limit due to low flow in one or more RCS loops, while avoiding reactor trips due to normalvariations in loop flow.Above the P-8 setpoint, which is approximately 48% RTP, a loss of flow in any RCS loop will actuate a reactor trip. The setpoints are based on the minimum flow specified in the McGuire Units 1 and 2 B 3.3.1-20 Revision No. 124 RTS Instrumentation.
B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
COLR. Each RCS loop has three flow detectors to monitor flow. The flow signals are not used for any control system input.The LCO requires three Reactor Coolant Flow-Low channels per loop to be OPERABLE in MODE I above P-8.In MODE 1 above the P-8 setpoint, a loss of flow in one RCS loop could result in DNB conditions in the core. In MODE 1 below the P-8 setpoint, a loss of flow in two or more loops is required to actuate a reactor trip (Function 10.b) because of the lower power level and the greater margin to the design limit DNBR.b. Reactor Coolant Flow-Low (Two Loops)The Reactor Coolant Flow-Low (Two Loops) trip Function ensures that protection is provided against violating the DNBR limit due to low flow in two or more RCS loops while avoiding reactor trips due to normal variations in loop flow.Above the P-7 setpoint and below the P-8 setpoint, a loss of flow in two or more loops will initiate a reactor trip. The setpoints are based on the minimum flow specified in the COLR. Each loop has three flow detectors to monitor flow.The flow signals are not used for any control system input.The LCO requires three Reactor Coolant Flow-Low channels per loop to be OPERABLE.In MODE 1 above the P-7 setpoint and below the P-8 setpoint, the Reactor Coolant Flow-Low (Two Loops) trip must be OPERABLE.
Below the P-7 setpoint, all reactor trips on low flow are automatically blocked since power distributions that would cause a DNB concern at this low power level are unlikely.
Above the P-7 setpoint, the reactor trip on low flow in two or more RCS loops is automatically enabled. Above the P-8 setpoint, a loss of flow in any one loop will actuate a reactor trip because of the higher power level and the reduced margin to the design limit DNBR.McGuire Units 1 and 2 B 3.3.1-21 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- 11. Undervoltaqe Reactor Coolant Pumps, The Undervoltage RCPs reactor trip Function ensures that protection is provided against violating the DNBR limit due to a loss of flow in two or more RCS loops. The voltage to each RCP is monitored.
Above the P-7 setpoint, a loss of voltage detected on two or more RCP buses will initiate a reactor trip. This trip Function will generate a reactor trip before the Reactor Coolant Flow-Low (Two Loops) Trip Setpoint is reached. Time delays are incorporated into the Undervoltage RCPs channels to prevent reactor trips due to momentary electrical power transients.
The LCO requires a total of four Undervoltage RCPs channels (one per bus) to be OPERABLE.In MODE 1 above the P-7 setpoint, the Undervoltage RCP trip must be OPERABLE.
Below the P-7 setpoint, all reactor trips on loss of flow are automatically blocked since power distributions that would cause a DNB concern at this low power level are unlikely.
Above the P-7 setpoint, the reactor trip on loss of flow in two or more RCS loops is automatically enabled.12. Underfrequency Reactor Coolant Pumps The Underfrequency RCPs reactor trip Function ensures that protection is provided against violating the DNBR limit due to a loss of flow in two or more RCS loops from a major network frequency disturbance.
An underfrequency condition will slow down the pumps, thereby reducing their coastdown time following a pump trip. The proper coastdown time is required so that reactor heat can be removed immediately after reactor trip. The frequency of each RCP bus is monitored.
Above the P-7 setpoint, a loss of frequency detected on two or more RCP buses will initiate a reactor trip. This trip Function will generate a reactor trip before the Reactor Coolant Flow-Low (Two Loops) Trip Setpoint is reached.Time delays are incorporated into the Underfrequency RCPs channels to prevent reactor trips due to momentary electrical power transients.
The LCO requires a total of four Underfrequency RCPs channels (one per bus) to be OPERABLE.McGuire Units 1 and 2 B 3.3.1-22 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
In MODE 1 above the P-7 setpoint, the Underfrequency RCPs trip must be OPERABLE.
Below the P-7 setpoint, all reactor trips on loss of flow are automatically blocked since power distributions that would cause a DNB concern at this low power level are unlikely.Above the P-7 setpoint, the reactor trip on loss of flow in two or more RCS loops is automatically enabled.13. Steam Generator Water Level-Low Low The SG Water Level-Low Low trip Function ensures that protection is provided against a loss of heat sink and actuates the AFW System prior to uncovering the SG tubes. The SGs are the heat sink for the reactor. In order to act as a heat sink, the SGs must contain a minimum amount of water. A narrow range low low level in any SG is indicative of a loss of heat sink for the reactor. The level transmitters provide input to the SG Level Control System.Therefore, the actuation logic must be able to withstand an input failure to the control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
This Function also performs the ESFAS function of starting the AFW pumps on low low SG level.The LCO requires four channels of SG Water Level-Low Low per SG to be OPERABLE since these channels are shared between protection and control.In MODE 1 or 2, when the reactor requires a heat sink, the SG Water Level-Low Low trip must be OPERABLE.
The normal source of water for the SGs is the Main Feedwater (MFW) System (not safety related).
The MFW System is normally in operation in MODES 1, 2, 3, or 4. The AFW System is the safety related backup source of water to ensure that the SGs remain the heat sink for the reactor. In MODE 3, 4, 5, or 6, the SG Water Level-Low Low Function does not have to be OPERABLE because the reactor is not operating or even critical.
Decay heat removal is accomplished by the steam generators in MODE 3 and 4 and by the Residual Heat Removal (RHR) System in MODE 4, 5, or 6.McGuire Units 1 and 2 B 3.3.1-23 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- 14. Turbine Trip a. Turbine Trip-Low Fluid Oil Pressure The Turbine Trip-Low Fluid Oil Pressure trip Function anticipates the loss of heat removal capabilities of the secondary system following a turbine trip. This trip Function acts to minimize the pressure/temperature transient on the reactor. Any turbine trip from a power level below the P-8 setpoint, approximately 48% power, will not actuate a reactor trip. Three pressure switches monitor the control oil pressure in the Turbine Electrohydraulic Control System. A low pressure condition sensed by two-out-of-three pressure switches will actuate a reactor trip. These pressure switches do not provide any input to the control system. The unit is designed to withstand a complete loss of load and not sustain core damage or challenge the RCS pressure limitations.
Core protection is provided by the Pressurizer Pressure-High trip Function and RCS integrity is ensured by the pressurizer safety valves. Turbine Trip-Low fluid oil pressure is diverse to the Turbine Trip-Turbine Stop Valve Closure Function.The LCO requires three channels of Turbine Trip-Low Fluid Oil Pressure to be OPERABLE in MODE 1 above P-8.Below the P-8 setpoint, a turbine trip does not actuate a reactor trip. In MODE 2, 3, 4, 5, or 6, there is no potential for a turbine trip, and the Turbine Trip-Low Fluid Oil Pressure trip Function does not need to be OPERABLE.b. Turbine Trip-Turbine Stop Valve Closure The Turbine Trip-Turbine Stop Valve Closure trip Function anticipates the loss of heat removal capabilities of the secondary system following a turbine trip from a power level above the P-8 setpoint, approximately 48% power. The trip Function anticipates the loss of secondary heat removal capability that occurs when the stop valves close. Tripping the reactor in anticipation of loss of secondary heat removal acts to minimize the pressure and temperature transient on the reactor. This trip Function will not and is not required to operate in the presence of a single channel failure. The unit is designed to withstand a complete loss of load and not McGuire Units 1 'and 2 B 3.3.1-24 Revision No. 124 RTS Instrumentation B 3.3.1 BASES-APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) sustain core damage or challenge the RCS pressure limitations.
Core protection is provided by the'Pressurizer Pressure-High trip Function, and RCS integrity is ensured by the pressurizer safety valves.' This trip Function is diverse to the Turbine Trip-Low Fluid Oil Pressure trip Function.Each turbine stop valve is equipped with one limit switch that inputs to the RTS. If all four limit switches indicate that the stop valves are closed, a reactor trip is initiated.
The LSSS for this Function is set to assure channel trip occurs when the associated stop valve is completely closed.The LCO requires four Turbine Trip-Turbine Stop Valve Closure channels, one-per valve, to be OPERABLE-in MODE 1 above P-8. All four channels must trip to cause reactor trip.Below the P-8 setpoint, a load rejection can be accommodated by the Steam, Dump System. In MODE 2, 3, 4, 5, or 6, there is no potential for a load rejection, and the Turbine Trip-Stop Valve Closure tripFunction does not need to be OPERABLE.15. Safety Iniection Input from Engineered Safety Feature Actuation System The SI Input from ESFAS ensures that if a reactor trip has not already been generated by the RTS, the ESFAS automatic actuation logic will initiate a reactor trip upon any signal that initiates SI. This is a condition of acceptability for the LOCA.However, other transients and accidents take credit for varying levels of ESF performance and rely upon rod insertion, except for the most reactive rod that is assumed to be fully withdrawn, to ensure reactor shutdown.
Therefore, a reactor trip is initiated every time an SI signal is present.Trip Setpoint and Allowable Values are not applicable to this Function.
The SI Input is provided by a manual switch or by the automatic actuation logic. Therefore, there is no measurement signal with which to associate an. LSSS.The LCO requires two trains of SI Input from ESFAS to be OPERABLE in MODE 1 or 2.McGuire Units 1 and 2 B 3.3.1-25 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
A reactor trip is initiated every time an Sl signal is present.Therefore, this trip Function must be OPERABLE in MODE 1 or 2, when the reactor is critical, and must be shut down in the event of an accident.
In MODE 3, 4, 5, or 6, the reactor is not critical, and this trip Function does not need to be OPERABLE.16. Reactor Trip System Interlocks Reactor protection interlocks are provided to ensure reactor trips are in the correct configuration for the current unit status. They back up operator actions to ensure protection system Functions are not bypassed during unit conditions under which the safety analysis assumes the Functions are not bypassed.
Therefore, the interlock Functions do not need to be OPERABLE when the associated reactor trip functions are outside the applicable MODES. These are: al. Intermediate Range Neutron Flux, P-6 (Westinghouse-supplied Instrumentation)
The Westinghouse-supplied Intermediate Range excore detector systems (utilizing compensated ion chamber detectors) are being replaced with Thermo Scientific-supplied 300i neutron flux monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Westinghouse-supplied instrumentation.
The next section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The Intermediate Range Neutron Flux, P-6 interlock is actuated when any NIS intermediate range channel goes approximately one decade above the minimum channel reading. If both channels drop below the setpoint, the permissive will automatically be defeated.
The LCO requirement for the P-6 interlock ensures that the following Functions are performed:
on increasing power, the P-6 interlock allows the manual block of the NIS Source Range, Neutron Flux reactor trip. This prevents a premature block of the source range trip and allows the operator to ensure that the intermediate range is OPERABLE prior to leaving the source range. When the source range trip is blocked, the high voltage to the detectors is also removed; and McGuire Units 1 and 2 B 3.3.1-26 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) on decreasing power, the P-6 interlock automatically energizes the NIS source range detectors and enables the NIS Source Range Neutron Flux reactor trip.The LCO requires two channels of Intermediate Range Neutron Flux, P-6 interlock to be OPERABLE in MODE 2 when below the P-6 interlock setpoint.Above the P-6 interlock setpoint, the NIS Source Range Neutron Flux reactor trip will be blocked, and this Function will no longer be necessary.
In MODE 3, 4, 5, or 6, the P-6 interlock does not have to be OPERABLE because the NIS Source Range is providing core protection.
a2. Intermediate Ranqe Neutron Flux, P-6 (Thermo Scientific-supplied Instrumentation)
The Westinghouse-supplied Intermediate Range excore detector systems (utilizing compensated ion chamber detectors) are being replaced with Thermo Scientific-supplied 300i neutron flux monitoring systems (utilizing fission chamber detectors).
This section of the Bases applies to the Thermo Scientific-supplied instrumentation.
The previous section of the Bases applies to the Westinghouse-supplied instrumentation.
The Intermediate Range Neutron Flux, P-6 interlock is actuated when any NIS intermediate range channel goes approximately three decades above the minimum channel reading. If both channels drop below the setpoint, the permissive will automatically be defeated.
The LCO requirement for the P-6 interlock ensures that the following Functions are performed:
McGuire Units 1 and 2 B 3.3.1-27 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) on increasing power, the P-6 interlock allows the manual block of the NIS Source Range, Neutron Flux reactor trip.This prevents a premature block of the source range trip and allows the operator to ensure that the intermediate range is OPERABLE prior to leaving the source range;and* on decreasing power, the P-6 interlock automatically enables the NIS Source Range Neutron Flux reactor trip.The LCO requires two channels of Intermediate Range Neutron Flux, P-6 interlock to be OPERABLE in MODE 2 when below the P-6 interlock setpoint.Above the P-6 interlock setpoint, the NIS Source Range Neutron Flux reactor trip will be blocked, and this Function will no longer be necessary.
In MODE 3, 4, 5, or 6, the P-6 interlock does not have to be OPERABLE because the NIS Source Range is providing core protection.
- b. Low Power Reactor Trips Block, P-7 The Low Power Reactor Trips Block, P-7 interlock is actuated by input from either the Power Range Neutron Flux, P-1 0,or the Turbine Inlet Pressure, P-13 interlock.
The LCO requirement for the P-7 interlock ensures that the following Functions are performed:
(1) on increasing power, the P-7 interlock automatically enables reactor trips on the following Functions:
- Pressurizer Pressure-Low;
- .Pressurizer Water Level-High;
- Reactor Coolant Flow-Low (Two Loops);Undervoltage RCPs; and Underfrequency RCPs.McGuire Units 1 and 2 B B 3.3.1-28 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
These reactor trips are only required when operating above the P-7 setpoint (approximately 10% power).The reactor trips provide protection against violating the DNBR limit. Below the P-7 setpoint, the RCS is capable of providing sufficient natural circulation without any RCP running.(2) on decreasing power, the P-7 interlock automatically blocks reactor trips on the following Functions:
Pressurizer Pressure-Low; Pressurizer Water Level-High; Reactor Coolant Flow-Low (Two Loops);Undervoltage RCPs; and Underfrequency RCPs.Trip Setpoint and Allowable Value are not applicable to the P-7 interlock because it is a logic Function and thus has no parameter with which to associate an LSSS.The P-7 interlock is a logic Function with train and not channel identity.
Therefore, the LCO requires one channel per train of Low Power Reactor Trips Block, P-7 interlock to be OPERABLE in MODE 1.The low power trips are blocked below the P-7 setpoint and unblocked above the P-7 setpoint.
In MODE 2, 3, 4, 5, or 6, this Function does not have to be OPERABLE because the interlock performs its Function when power level drops below 10% power, which is in MODE 1.McGuire Units 1 and 2 B 3.3.1-29 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- c. Power Ranqe Neutron Flux, P-8 The Power Range Neutron Flux, P-8 interlock is actuated at approximately 48% power as determined by two-out-of-four NIS power range detectors.
The P-8 interlock automatically enables the Reactor Coolant Flow-Low (Single Loop)reactor trip on low flow in one or more RCS loops, and the Turbine Trip-Low Fluid Oil Pressure and Turbine Trip-Turbine Stop Valve Closure reactor trips on increasing power. The LCO requirement for the Reactor Coolant Flow -Low Function ensures that protection is provided against a loss of flow in any RCS loop that could result in DNB conditions in the core when greater than approximately 48% power.Above the P-8 setpoint, a turbine trip will cause a load rejection beyond the capacity of the Steam Dump System. A reactor trip is automatically initiated on a turbine trip when it is above the P-8 setpoint, to minimize the transient on the reactor. On decreasing power below the P-8 setpoint, the reactor trip on low flow in any loop is automatically blocked.The LCO requires four channels of Power Range Neutron Flux, P-8 interlock to be OPERABLE in MODE 1.In MODE 1, a loss of flow in one RCS loop could result in DNB conditions and, a turbine trip could cause a load rejection beyond the capacity of the Steam Dump System, so the Power Range Neutron Flux, P-8 interlock must be OPERABLE.
In MODE 2, 3, 4, 5, or 6, this Function does not have to be OPERABLE because the core is not producing sufficient power to be concerned about DNB conditions and the reactor is not at a power level sufficient to have a load rejection beyond the capacity of the Steam Dump System.McGuire Units 1 and 2ýB 3.3.1-30 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- d. Power Range Neutron Flux, P-10 The Power Range Neutron Flux, P-10 interlock is actuated at approximately 10% power, as determined by two-out-of-four NIS power range detectors.
If power level falls below 10% RTP on 3 of 4 channels, the nuclear instrument trips will be automatically unblocked.
The LCO requirement for the P-10 interlock ensures that the following Functions are performed:
on increasing power, the P-i0 interlock allows the operator to manually block the Intermediate Range Neutron Flux reactor trip. Note that blocking the reactor trip also blocks the signal to prevent automatic and manual rod withdrawal; on increasing power,.the P-10 interlock allows the operator to manually block the Power Range Neutron Flux-Low reactor trip;on increasing power, the P-10 interlock automatically provides a backup signal to block the Source Range Neutron Flux reactor trip, and also to de-energize the NIS Westinghouse-supplied source range detectors (the Westinghouse-supplied source range detectors are being replaced with Thermo Scientific-supplied detectors that remain energized);
the P-1 0 interlock provides one of the two inputs to the P-7 interlock; and on decreasing power, the P-1 0 interlock automatically enables the Power Range Neutron Flux-Low reactor trip and the Intermediate Range Neutron Flux reactor trip (and rod stop).McGuire Units 1 and 2 B 3.3.1-31 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
The LCO requires four channels of Power Range Neutron Flux, P-1 0 interlock to be OPERABLE in MODE 1 or 2.OPERABILITY in MODE 1 ensures the Function is available to perform its decreasing power-Functions in the event of a reactor shutdown.
This Function must be OPERABLE in MODE 2 to ensure that core protection is provided during a startup or shutdown by the Power Range Neutron Flux-Low and Intermediate Range Neutron Flux reactor trips. In MODE 3, 4, 5, or 6, this Function does not have to be OPERABLE because the reactor is not at power and the Source Range Neutron Flux reactor trip provides core protection.
- e. Turbine Inlet Pressure, P-13 The Turbine Inlet Pressure, P-13 interlock is actuated when the pressure at the inlet to the high pressure turbine ýis greater than a pressure equivalent to approximately 10% of the rated full power pressure.
This is determined by one-out-of-two pressure detectors.
The LCO requirement for this Function ensures that one of the inputs to the P-7 interlock is available.
The LCO requires two channels of Turbine Inlet Pressure, P-13 interlock to be OPERABLE in MODE 1.The Turbine Inlet Pressure, P-13 interlock must be OPERABLE when the turbine generator is operating.
The interlock Function is not required OPERABLE in MODE 2, 3, 4, 5, or .6 because the turbine generator is not operating.
Note: The terms Turbine Impulse Chamber Pressure, Turbine Inlet Pressure, Turbine Impulse Pressure, and First Stage Pressure are functionally equivalent.
- 17. Reactor Trip Breakers This trip Function applies to the RTBs exclusive of individual trip mechanisms.
The LCO requires two OPERABLE trains of trip breakers.
A trip breaker train consists of all trip breakers associated with a single RTS logic train that are racked in, closed, and capable of supplying power to the CRD System. Thus, the McGuire Units 1 and 2 B 3.3.1-32 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) train may consist of the main breaker, bypass breaker, or main breaker and bypass breaker, depending upon the system configuration.
Two OPERABLE trains ensure no single random failure can disable the RTS trip capability.
These trip Functions must be OPERABLE in MODE 1 or 2 when the reactor is critical.
In MODE 3, 4, or 5, these RTS trip Functions must be OPERABLE when the RTBs or associated bypass breakers are closed, and the CRD System is capable of rod withdrawal.
- 18. Reactor Trip Breaker Undervoltaqe and Shunt Trip Mechanisms The LCO requires both the Undervoltage and Shunt Trip Mechanisms to be OPERABLE for each RTB that is in service. The trip mechanisms are not required to be OPERABLE for trip breakers that are open, racked out, incapable of supplying power to the CRD System, or declared inoperable under Function 17 above.OPERABILITY of both trip mechanisms on each breaker ensures that no single trip mechanism failure will prevent opening any breaker on a valid signal.These trip Functions must be OPERABLE in MODE 1 or 2 when the reactor is critical.
In MODE 3, 4, or 5, these RTS trip Functions must be OPERABLE when the RTBs or associated bypass breakers are closed, and the CRD System is capable of rod withdrawal.
- 19. Automatic Trip Logqic The LCO requirement for the RTBs (Functions 17 and 18) and Automatic Trip Logic (Function
- 19) ensures that means are provided to interrupt the power to allow the rods to fall into the reactor core. Each RTB is equipped with an undervoltage coil and a shunt trip coil to trip the breaker open when needed. Each train RTB has a bypass breaker to allow testing of the trip breaker while the unit is at power. The reactor trip signals generated by the RTS Automatic Trip Logic cause the RTBs and associated bypass breakers to open and shut down the reactor.The LCO requires two trains of RTS Automatic Trip Logic to be OPERABLE.
Having two OPERABLE channels ensures that random failure of a single logic channel will not prevent reactor trip.McGuire Units 1 and 2 B 3.3.1-33 Revision No. 124 RTS Instrumentation B 3.3.1 BASES APPLICABLE SAFETY ANALYSES, LCO,.and APPLICABILITY (continued)
These trip Functions must be OPERABLE in MODE 1 or 2 when the reactor is critical.
In MODE 3, 4,;or 5, these RTS trip Functions must be OPERABLE when'the RTBs and associated bypass breakers are closed, and the CRD System is capable of rod withdrawal.
The RTS instrumentation satisfies Criterion 3 of 10 CFR 50.36 (Ref. 6).ACTIONS A Note has been added to the ACTIONS to clarify the application of Completion Time rules. The Conditions of this Specification may be entered independently for each Function listed in Table 3.3.1-1. When the Required Channels in Table 3.3.1-1 are specified (e.g., on a per steam line, per loop, per SG, etc., basis), then the Condition may be entered separately for each steam line, loop, SG, etc., as appropriate.
A channel shall be OPERABLE if the point at which the channel trips is found equal to or more conservative than the Allowable Value. In the event a channel's trip setpoint is found less conservative than the Allowable Value, or the transmitter, instrument loop, signal processing electronics, or bistable is found inoperable, then all affected Functions provided by that channel must be declared inoperable and the LCO Condition(s) entered for the protection Function(s) affected.
Unless otherwise specified, if plant conditions warrant, the trip setpoint may be set outside the NOMINAL TRIP SETPOINT calibration tolerance band as long as the trip setpoint is conservative with respect to the NOMINAL TRIP SETPOINTS.
If the trip setpoint is found outside the NOMINAL TRIP SETPOINT calibration tolerance band and non-conservative with respect to the NOMINAL TRIP SETPOINT, the setpoint shall be re-adjusted.When the number of inoperable channels in a trip Function exceed those specified in one or other related Conditions associated with a trip Function, then the unit is outside the safety analysis.
Therefore, LCO 3.0.3 must be immediately entered if applicable in the current MODE of operation.
A._1 Condition A applies to all RTS protection Functions.
Condition A addresses the situation where one or more required channels for one or more Functions are inoperable at the same time. The Required Action is to refer to Table 3.3.1-1 and to take the Required Actions for the protection functions affected.
The Completion Times are those from the referenced Conditions and Required Actions.McGuire Units 1 and 2 B 3.3.1-34 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
B.1 and B.2 Condition B applies to the Manual Reactor Trip in MODE 1 or 2. This action addresses the train orientation of the SSPS for this Function.
With one channel inoperable, the inoperable channel must be restored to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. In this Condition, the remaining OPERABLE channel is adequate to perform the safety function.The Completion Time of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is reasonable considering that there are two automatic actuation trains and another manual initiation channel OPERABLE, and the low probability of an event occurring during this interval.If the Manual Reactor Trip Function cannot be restored to OPERABLE status within the allowed 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> Completion Time, the unit must be brought to a MODE in which the requirement does not apply. To achieve'this status, the unit must be brought to at least MODE 3 within 6 additional hours (54 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br /> total time). The 6 additional hours are reasonable, based on operating experience, to reach MODE 3 from full power operation in an orderly manner and without challenging unit systems. With the unit in MODE 3, the MODES 1 and 2 requirements for this trip Function are no longer required and Condition C is entered.C.1 and C.2 Condition C applies to the following reactor trip Functions in MODE 3, 4, or 5 with the RTBs closed and the CRD System capable of rod withdrawal:
- Manual Reactor Trip;" RTBs;RTB Undervoltage and Shunt Trip Mechanisms; and Automatic Trip Logic.This action addresses the train orientation of the SSPS for these Functions.
With one channel or train inoperable, the inoperable channel or train must be restored to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. If the affected Function(s) cannot be restored to OPERABLE status within the allowed 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> Completion Time, the unit must be placed in a condition in which the requirement does not apply. To achieve this status, the RTBs must be opened within the next hour. The additional hour provides McGuire Units 1 and 2 B 3.3.1-35 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued) sufficient time to accomplish the action in an orderly manner. With the RTBs open, these Functions are no longer required.The Completion Time is reasonable considering that in this Condition, the remaining OPERABLE train is adequate to perform the safety function, and given the low.probability of an event occurring during this interval.D.1.1, D.1.2, and D.2 Condition D applies to the Power Range Neutron Flux-High and Power Range Neutron Flux-High Positive Rate Functions.
The NIS power range detectors provide input to the CRD System and the SG Water Level Control System and, therefore, have a two-out-of-four trip logic. A known inoperable channel must be placed in the tripped condition.
This results in a partial trip condition requiring only one-out-of-three logic for actuation.
The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to place the inoperable channel in the tripped condition is justified in WCAP-14333-P-A (Ref. 10).With one of the NIS power range detectors inoperable, 1/4 of the radial power distribution monitoring capability is lost. Therefore, SR 3.2.4.2 must be performed (Required Action D.1.1) within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of THERMAL POWER exceeding 75% RTP and once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter.
Calculating QPTR every, 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> compensates for the lost monitoring capability due to the inoperable NIS power range channel and allows continued unit operation at power levels > 75% RTP. At power levels <75% RTP, operation of the core with radial power distributions beyond the design limits, at a power level where DNB conditions may exist, is prevented.
The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Completion Time is consistent with the surveillance Requirement Frequency in LCO 3.2.4, "QUADRANT POWER TILT RATIO (QPTR)." Required Action D.1.1 has been modified by a Note which only requires SR 3.2.4.2 to be performed if the Power Range Neutron Flux input to QPTR becomes inoperable.
Failure of a component in the Power Range Neutron Flux Channel which renders the High Flux Trip Function inoperable may not affect the capability to monitor QPTR. As such, determining QPTR using movable incore detectors may not be necessary.
As an alternative to the above Actions, the plant must be placed in a MODE where this Function is no longer required OPERABLE.
Seventy eight (78) hours are allowed to place the plant in MODE 3. The 78 hour9.027778e-4 days <br />0.0217 hours <br />1.289683e-4 weeks <br />2.9679e-5 months <br /> completion time includes 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for channel corrective maintenance and an additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> for the MODE reduction as required by Required Action D.2. This is a reasonable time, based on operating experience, to reach MODE 3,from full power in an orderly manner and McGuire Units 1 and 2 B 3.3.1-36 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued) without challenging plant systems. If Required Actions cannot be completed within their allowed Completion Times, LCO 3.0.3 must be entered.The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypass condition for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while performing routine surveillance testing of other channels.
The Note also allows placing the inoperable channel in the bypass condition to allow setpoint adjustments of other channels when required to reduce the setpoint in accordance with other Technical Specifications.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> time limit is justified in Reference 10.E.1 and E.2 Condition E applies to the following reactor trip Functions:
Power Range Neutron Flux-Low;* Overtemperature AT;* Overpower AT;* Pressurizer Pressure-High; and SG Water Level-Low Low.A known inoperable channel must be placed in the tripped condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Placing the channel in the tripped condition results in a partial trip condition requiring only one-out-of-three logic for actuation of the two-out-of-four trips. The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to place the inoperable channel in the tripped condition is justified in Reference 10.If the operable channel cannot be placed in the trip condition within the specified Completion Time, the unit must be placed in a MODE where these Functions are not required OPERABLE.
An additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is allowed to place the unit in MODE 3. Six hours is a reasonable time, based on operating experience, to place the unit in MODE 3 from full power in an orderly manner and without challenging unit systems.McGuire Units 1 and 2 B 3.3.1-37 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up' to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while performing routine surveillance testing of the other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> time limit is justified in Reference 10.F.1 and F.2 Condition F applies to the Intermediate Range Neutron Flux trip when THERMAL POWER is above-the P-6 setpoint and below the P-1 0 setpoint and one channel is inoperable.
Above the P-6 setpoint and below the P-10 setpoint, the NIS intermediate range detector performs the monitoring Functions.
If THERMAL POWER is greater than the P-6 setpoint but less than the P-10 setpoint, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is allowed to reduce THERMAL POWER below the P-6 setp.oint or increase to THERMAL POWER above the P-10 setpoint.
The NIS Intermediate Range Neutron Flux channels must be OPERABLE when the power level is above the capability of the source range, P-6, and below the capability of the power range, P-1 0. If THERMAL POWER is greater than the P-1 0 setpoint, the NIS power range detectors perform the monitoring and protection functions and the intermediate range is not required.
The Completion Times allow for a slow and controlled power adjustment above P-10 or below P-6 and take into account the redundant capability afforded by the redundant OPERABLE channel; and the low probability of its failure during this period. This action does not require the inoperable channel to be tripped because the Function*uses one-out-of-two logic. Tripping one channel would trip the reactor.Thus, the Required Actions specified in this Condition are only applicable when channel failure does not result in reactor trip.G.1 and G.2 Condition G applies to two inoperable Intermediate Range Neutron Flux trip channels in MODE 2 when THERMAL POWER is above the P-6 setpoint and below the P-1 0 setpoint.
Required Actions specified in this Condition are only applicable when channel failures do not result in reactor trip.Above the P-6 setpoint and below the P-10 setpoint, the NIS intermediate range detector performs the monitoring Functions.
With no intermediate range channels OPERABLE, the Required Actions are to suspend operations involving positive reactivity additions immediately.
This will preclude any power level increase since there are no McGuire Units I and 2 B 3.3.1-38 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
OPERABLE Intermediate Range Neutron Flux channels.
The operator must also reduce THERMAL POWER below the P-6 setpoint within two hours. Below P-6, the Source Range Neutron Flux channels will be able to monitor the core power level. The Completion Time of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> will allow a slow and controlled power reduction to less than the P-6 setpoint and takes into account the low probability of occurrence of an event during this period that may require the protection afforded by the NIS Intermediate Range Neutron Flux trip. Required Action G.1 is modified by a note to indicate that normal plant control operations that individually add limited positive reactivity (e.g., temperature or boron fluctuations associated with RCS inventory management or temperature control) are not precluded by this Action.H.1 Condition H applies to the Intermediate Range Neutron Flux trip when THERMAL POWER is below the P-6 setpoint and one or two channels are inoperable.
Below the P-6 setpoint, the NIS source range performs the monitoring and protection functions.
The inoperable NIS intermediate range channel(s) must be returned to OPERABLE status prior to increasing power above the P-6 setpoint.
The NIS intermediate range channels must be OPERABLE when the power level is above the capability of the source range, P-6, and below the capability of the power range, P-10.1.1 Condition I applies to one inoperable Source Range Neutron Flux trip channel when in MODE 2, below the P-6 setpoint, and performing a reactor startup. With the unit in this Condition, below P-6, the NIS source range performs the monitoring and protection functions.
With one of the two channels inoperable, operations involving positive reactivity additions shall be suspended immediately.
This will preclude any power escalation.
With only one source range channel OPERABLE, core protection is severely reduced and any actions that add positive reactivity to the core must be suspended immediately.
Required Action 1.1 is modified by a note to indicate that normal plant control operations that individually add limited positive reactivity (e.g., temperature or boron fluctuations associated with RCS inventory management or temperature control) are not precluded by this Action.McGuire Units 1 and 2 B 3.3.1-39 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
J.1 Condition J applies to two inoperable Source Range Neutron Flux trip channels when in MODE 2, below the P-6 setpoint, and performing a reactor startup, or in MODE 3, 4, or 5 with the RTBs closed and the CRD System capable of rod withdrawal.
With the unit in this Condition, below P-6, the NIS source range performs the monitoring and protection functions.
With both source range channels inoperable, the RTBs must be opened immediately.
With the RTBs open, the core is in a more stable condition and the unit enters Condition L.K.1 and K.2 Condition K applies to one inoperable source range channel in MODE 3, 4, or 5 with the RTBs closed and the CRD System capable of rod withdrawal.
With the unit in this Condition, below P-6, the NIS source range performs the monitoring and protection functions.
With one of the source range channels inoperable, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is allowed to restore it to an OPERABLE status. If the channel cannot be returned to an OPERABLE status, 1 additional hour is allowed to open the RTBs. Once the RTBs are open, the core is in a more stable condition and the unit enters Condition L. The allowance of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> to restore the channel to OPERABLE status, and the additional hour to open the RTBs, are justified in Reference 7.L.1, L.2, and L.3 Condition L applies when the required number of OPERABLE Source Range Neutron Flux channels is not met in MODE 3, 4, or 5 with the RTBs open. With the unit in this Condition, the NIS source range performs a monitoring function.
With less than the required number of source range channels OPERABLE, operations involving positive reactivity additions shall be suspended immediately.
In addition to suspension of positive reactivity additions, all valves that could add unborated water to the RCS must be closed within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> as specified in LCO 3.9.2. The isolation of unborated water sources will preclude a boron dilution accident.Also, the SDM must be verified within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter as per SR 3.1.1.1, SDM verification.
With no source range channels OPERABLE, core monitoring is severely reduced. Verifying the SDM within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> allows sufficient time to perform the calculations and determine that the SDM requirements are met. The SDM must also be verified once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter to ensure that the core reactivity has not changed. Required Action L.1 precludes any positive reactivity McGuire Units 1 and 2 B 3.3.1-40 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued) additions; therefore, core reactivity should not be increasing, and a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is adequate.
The Completion Times of within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> are based on operating experience in performing the Required Actions and the knowledge that unit conditions will change slowly. Required Action L.1 is modified by a note which permits plant temperature changes provided the temperature change is accounted for in the calculated SDM and that Keff remains < 0.99. Introduction of temperature changes including temperature increases when a positive MTC exists, must be evaluated to ensure they do not result in a loss of required SDM or adequate margin to criticality.
M.1 and M.2 Condition M applies to the following reactor trip Functions:
Pressurizer Pressure-Low; Pressurizer Water Level-High; Reactor Coolant Flow-Low (Two Loops);Undervoltage RCPs; and Underfrequency RCPs.With one channel inoperable, the inoperable channel must be placed in the tripped condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Placing the channel in the tripped condition results in a partial trip condition requiring only one additional channel to initiate a reactor trip above the P-7 setpoint (and below the P-8 setpoint for the Reactor Coolant Flow-Low (Two Loops) Function).
These Functions do not have to be OPERABLE below the P-7 setpoint because, for the Pressurizer Water Level-High function, transients are slow enough for manual action; and for the other functions, power distributions that would cause a DNB concern at this low power level are unlikely.
The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to place the channel in the tripped condition is justified in Reference
- 10. An additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is allowed to reduce THERMAL POWER to below P-7 if the inoperable channel cannot be restored to OPERABLE status or placed in trip within the specified Completion Time.Allowance of this time interval takes into consideration the redundant capability provided by the remaining redundant OPERABLE channel, and the low probability of occurrence of an event during this period that may require the protection afforded by the Functions associated with Condition M.McGuire Units 1 and 2 B 3.3.1-41 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while performing routine surveillance testing of the other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> time limit is justified in Reference 10.N.1 and N.2 Condition N applies to the Reactor Coolant Flow-Low (Single Loop)reactor trip Function.
With one channel inoperable, the inoperable channel must be placed in trip within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If the channel cannot be restored to OPERABLE status or the channel placed in trip within the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, then THERMAL POWER must be reduced below the P-8 setpoint within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. This places the unit in a MODE where the LCO is no longer applicable.
This trip Function does not have to be OPERABLE below the P-8 setpoint because other RTS trip Functions provide core protection below the P-8 setpoint.
The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to restore the channel to OPERABLE status or place in trip and the 4 additional hours allowed to reduce THERMAL POWER to below the P-8 setpoint are justified in Reference 10.The Required Actions have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while performing routine surveillance testing of the other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> time limit is justified in Reference 10.0.1, 0.2, P.1, and P.2 Condition 0 and P apply to Turbine Trip on Low Fluid Oil Pressure or on Turbine Stop Valve Closure. With a channel inoperable, the inoperable channel must be placed in the trip condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If placed in the tripped condition, this results in a partial trip condition requiring fewer additional channel to initiate a reactor trip. If the channel cannot be restored to OPERABLE status or placed in the trip condition, then power must be reduced below the P-8 setpoint within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to place the inoperable channel in the tripped condition and the 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> allowed for reducing power are justified in Reference 10.McGuire Units 1 and 2 B 3.3.1-42 Revision No. 124 RTS Instrumentation B 3.3.1.BASES ACTIONS (continued)
The Required Actions of Condition 0 have been modified by a Note that allows placing the inoperable channel in the bypassed condition for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while performing routine surveillance testing of the other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> time limit is justified in Reference 10.Q.1 and Q.2 Condition Q applies to the SI Input from ESFAS reactor trip and the RTS Automatic Trip Logic in MODES 1 and 2. These actions address the train orientation of the RTS for these Functions.
With one train inoperable, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> are allowed to restore the train to OPERABLE status (Required Action Q. 1) or the unit must be placed in MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.The Completion Time of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (Required Action Q.1) is reasonable considering that in this Condition, the remaining OPERABLE train is adequate to perform the safety function and given the low probability of an event during this interval.
The 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed to restore the inoperable RTS Automatic Trip Logic train to OPERABLE status is justified in Reference
- 10. The additional Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (Required Action Q.2) is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems.The Required Actions have been modified by a Note that allows bypassing one train up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing, provided the other train is OPERABLE.
The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> time limit for testing the RTS Automatic Trip Logic train may include testing the RTB also, if both the -Logic test and RTB test are conducted within the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> time limit. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> time limit is justified in Reference 10.R.1 and R.2 Condition R applies to the RTBs in MODES 1 and 2. These actions address the train orientation of the RTS for the RTBs. With one train inoperable, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is allowed for train corrective maintenance to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Completion Time is justified in Reference
- 11. The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems. Placing the unit in MODE 3 removes the requirement for this particular Function.McGuire Units 1 and 2 B 3.3.1-43 Revision No. 124 RTS Instrumentation' B 3.3.1 BASES ACTIONS (continued)
The Required Actions have been modified by a Note.. The Note allows one RTB to be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing, provided the other RTB is OPERABLE.
The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> time limit is justified in.Reference 11.S.1 and S.2 Condition S applies to the P-6 and P-10 interlocks.
With one or more channel(s) inoperable for one-out-of-two or two-out-of-four coincidence logic, the associated interlock must be verified to be in its required state for the existing unit condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or the unit must be placed in MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. Verifying the interlock status, by visual observation of the control room status lights, manually accomplishes the interlock's Function.
The Completion Time of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> is based on operating experience and the minimum amount of time allowed for manual operator actions. The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> Completion Times are equal to the time allowed by LCO 3.0.3 for shutdown actions in the event of a complete loss of RTS Function.T.1 and T.2 Condition T applies to the P-7, P-8, and P-13 interlocks.
With one or more channel(s) inoperable for one-out-of-two or two-out-of-four coincidence logic, the associated interlock must be verified to be in its required state for the existing unit condition within .1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or the unit must be placed in MODE 2 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. These actions are conservative for the case where power level is being raised. Verifying the interlock status, by visual observation of the control room status lights, manually accomplishes the interlock's Function.
The Completion Time of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> is based on operating experience and the minimum amount of time allowed for manual operator actions. The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is reasonable, based on operating experience, to reach MODE 2 from full power in an orderly manner and without challenging unit systems.McGuire Units 1 and 2 B 3.3.1-44 Revision No. 124 RTS Instrumentation B 3.3.1 BASES ACTIONS (continued)
U.1 and U.2 Condition U applies to the RTB Undervoltage and Shunt Trip Mechanisms, or diverse trip features, in MODES 1 and 2. With one of the diverse trip features inoperable, it must be restored to an OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or the unit must be placed in a MODE where the requirement does not apply. This is accomplished by placing the unit in MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (54 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br /> total time). With both diverse trip features inoperable, the reactor trip breaker is inoperable and Condition R is entered. The Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is a reasonable time, based on operating experience, to reach MODE 3 from full power in an orderly manner and without challenging unit systems.With the unit in MODE 3, the MODES 1 and 2 requirement for this function is no longer required and Condition C is entered. The affected RTB shall not be bypassed while one of the diverse features is inoperable except for the time required to perform maintenance to one of the diverse features.
The allowable time for performing maintenance of the diverse features is 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for the reasons stated under Condition R.The Completion Time of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> for Required Action U.1 is reasonable considering that in this Condition there is one remaining diverse feature for the affected RTB, and one OPERABLE RTB capable of performing the safety function and given the low probability of an event occurring during this interval.V.1 Withtwo'RTS trains inoperable, no automatic capability is available to shut down .the reactor, and immediate plant shutdown in accordance with LCO 3.0.3 is required.SURVEILLANCE The SRs for each RTS Function are identified by the SRs column of REQUIREMENTS Table 3.3.1-1 for that Function.A Note has been added to the SR Table stating that Table 3.3.1-1 determines which SRs apply to which RTS Functions.
Note that each channel of process protection supplies both trains of the RTS. When testing Channel I, Train A and Train B must be examined.Similarly, Train A and Train B must be examined when testing Channel II, McGuire Units 1 and 2 B 3.3.1-45 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
Channel III, and Channel IV (if applicable).
The CHANNEL CALIBRATION and COTs are performed in a manner that is consistent with the assumptions used in analytically calculating the required channel accuracies.
Performing the Neutron Flux Instrumentation surveillances meets the License Renewal Commitments for License Renewal Program for Neutron Flux Instrumentation Circuits per UFSAR Chapter 18, Table 18-1 and License Renewal Commitments Specification MCS-1274.00-00-0016, Section 4.44.SR 3.3.1.1 Performance of the CHANNEL CHECK ensures that gross failure of instrumentation has not occurred.
A CHANNEL CHECK is normally a comparison of the parameter indicated on one channel to a similar parameter on other channels.
It is based on the assumption that instrument channels monitoring the same parameter should read approximately the same value. Significant deviations between instrument channels could be an indication of excessive instrument drift in one of the channels or of something even more serious. A CHANNEL CHECK will detect gross channel failure; thus, it is key to verifying that the instrumentation continues to operate properly between each CHANNEL CALIBRATION.
Agreement criteria are determined by the unit staff based on a combination of the channel instrument uncertainties, including indication and readability.
If a channel is outside the criteria, it may be an indication that the sensor or the signal processing equipment has drifted outside its limit.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.2 SR 3.3.1.2 compares the calorimetric heat balance calculation to the NIS channel output. If the calorimetric exceeds the NIS channel output by> 2% RTP, the NIS is not declared inoperable, but must be adjusted.
If the NIS channel output cannot be properly adjusted, the channel is declared inoperable.
McGuire Units 1 and 2 B 3.3.1-46 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
Two Notes modify SR 3.3.1.2. The first Note indicates that the NIS channel output shall be adjusted consistent with the calorimetric results if the absolute difference between the NIS channel output and the calorimetric is > 2% RTP. The second Note clarifies that this Surveillance is required only if reactor power is _> 15% RTP and that 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is allowed for completing the first Surveillance after reaching 15% RTP. At lower power levels, calorimetric data are inaccurate.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.3 SR 3.3.1.3 compares the incore system to the NIS channel output. If the absolute difference in AFD is > 3%, the NIS channel is still OPERABLE, but must be readjusted.
If the NIS channel cannot be properly readjusted, the channel is declared inoperable.
This Surveillance is performed to verify the f(AI) input to the overtemperature AT Function and overpower AT Function.Two Notes modify SR 3.3.1.3. Note 1 indicates that the excore NIS channel shall be adjusted if the absolute difference between the incore and excore AFD is >_ 3%. Note 2 clarifies that the Surveillance is required only if reactor power is > 15% RTP and that 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is allowed for completing the first Surveillance after reaching 15% RTP.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.4 SR 3.3.1.4 is the performance of a TADOT. This test shall verify OPERABILITY by actuation of the end devices.The RTB test shall include separate verification of the undervoltage and shunt trip mechanisms.
Independent verification of RTB undervoltage and shunt trip Function is not required for the bypass breakers.
No capability is provided for performing such a test at power. The independent test for bypass breakers is included in SR 3.3.1.14.
The bypass breaker test shall include a local shunt trip. A Note has been added to indicate that this test must be performed on the bypass breaker prior to placing it in service.McGuire Units 1 and 2 B 3.3.1-47 Revision No. 124 RTS.lnstrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.5 SR 3.3.1.5 is the performance of an ACTUATION LOGIC TEST. The SSPS is tested using the semiautomatic tester. The train being tested is placed in the bypass condition, thus preventing inadvertent actuation.
Through the semiautomatic tester, all possible logic combinations, with and without applicable permissives, are tested for each protection function.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.6 SR 3.3.1.6 is a calibration of the excore channels.to the incore channels.If the measurements do not agree, the excore channels are not declared inoperable but must be calibrated to agree with the incore detector measurements.
If the excore channels cannot be adjusted, the channels are declared inoperable.
This Surveillance is performed to verify the f(AI)input to the overtemperature AT Function and overpower AT Function.At Beginning of Cycle (BOC), the excore channels are compared to the incore detector measurements.
This comparison is typically performed prior to exceeding 75% power. Excore detectors are adjusted as necessary.
This low power surveillance satisfies the initial performance of SR 3.3.1.6.At BOC, after reaching full power steady state conditions, additional incore and excore measurements are taken and excore detectors are adjusted as necessary.
The M factors are normally only determined at BOC, but they may be changed at other points in the fuel cycle if the relationship between excore and incore measurements changes significantly.
McGuire Units 1 and 2 B 3.3.1-48 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
A Note modifies SR 3.3.1.6. The Note states that this Surveillance is required only if reactor power is > 75% RTP and that 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is allowed for completing the first surveillance after reaching 75% RTP.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.7 SR 3.3.1.7 is the performance of a COT.A COT is performed on each required channel to ensure the channel will perform the intended Function.The tested portion of the Loop must trip within the Allowable Values specified in Table 3.3.1-1.The setpoint shall be left set consistent with the assumptions of the setpoint methodology.
SR 3.3.1.7 is modified by a Note that provides a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> delay in the requirement to perform this Surveillance for source range instrumentation when entering MODE 3 from MODE 2. This Note allows a normal shutdown to proceed without a delay for testing in MODE 2 and for a short time in MODE 3 until the RTBs are open and SR 3.3.1.7 is no longer required to be performed.
If the unit is to be in MODE 3 with the RTBs closed for > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> this Surveillance must be completed within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after entry into MODE 3. The surveillance shall include verification of the high flux at shutdown alarm setpoint of less than or equal to the average CPS Neutron Level reading (most consistent value between highest and lowest CPS Neutron Level reading) at five times background.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference
- 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will, continue to behave in accordance with safety analysis assumptions and McGuire Units I and 2 B 3.3.1-49 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) the channel performance assumptions in the setpoint methodology.
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program.will ensure required review and documentation of the condition for continued OPERABILITY.
The second Note requires that the as-left setting for the channel be returned to within the as-left tolerance of the Nominal Trip Setpoint (NTSP). Where a setpoint more conservative than the NTSP is used in the plant surveillance procedures (field setting), the as-left and as-found tolerances, as applicable, will be applied to the surveillance procedure setpoint.
This will ensure that sufficient margin to the Safety Limit and/or Analytical Limit is maintained.
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable.
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR. The NOMINAL TRIP SETPOINT definition includes a provision that would allow the as-left setting for the channel to be outside the tolerance band, provided the setting is conservative with respect to the NTSP. This provision is not applicable to Functions for which the second NOTE applies.SR 3.3.1.8 SR 3.3.1.8 is the performance of a COT as described in SR 3.3.1.7,.except it is modified by a Note that this test shall include verification that the P-6, during the Intermediate Range COT, and P-10, during the Power Range COT, interlocks are in their required state for the existing unit condition.
The verification is performed by visual observation of the permissive status light in the unit control room. The Frequency is modified by a Note that allows this surveillance to be satisfied if it has been performed within the frequency specified in the Surveillance Frequency Control Program or 184 days of the Frequencies prior to reactor startup and four hours after reducing power below P-1 0 and P-6.The Frequency of "prior to startup" ensures this surveillance is performed prior to critical operations and applies to the source, intermediate and power range low instrument channels.
The Frequency of "4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after reducing power below P-10" (applicable to intermediate and power range low channels) and "4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after reducing power below P-6" (applicable to source range channels) allows a normal shutdown to be completed and the unit removed from the MODE of Applicability for this surveillance without a delay to perform the testing'required by this surveillance.
The Frequency thereafter applies if the plant remains in the MODE of Applicability after the initial performances of prior to reactor startup and four hours after reducing power below P-10 or P-6.' The MODE of McGuire Units 1 and 2 B 3.3.1-50 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
Applicability for this surveillance is < P-1 0 for the power range low and intermediate range channels and < P-6 for the source range channels.Once the unit is in MODE 3, this surveillance is no longer required.
If power is to be maintained
< P-10 or < P-6 for more than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, then the testing required by this surveillance must be performed prior to the expiration of the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> limit. Four hours is a reasonable time to complete the required testing or place the unit in a MODE where this surveillance is no longer required.
This test ensures that the NIS source, intermediate, and power range low channels are OPERABLE prior to taking the reactor critical and after reducing power into the applicable MODE (< P-10 or < P-6) for periods > 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference
- 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology.
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition for continued OPERABILITY.
The second Note requires that the as-left setting for the channel be returned to within the as-left tolerance of the Nominal Trip Setpoint (NTSP). Where a setpoint more conservative than the NTSP is used in the plant surveillance procedures (field setting), the as-left and as-found tolerances, as applicable, will be applied to the surveillance procedure setpoint.
This will ensure that sufficient margin to the Safety Limit and/or Analytical Limit is maintained.
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable.
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR. The NOMINAL TRIP SETPOINT definition includes a provision that would allow the as-left setting for the channel to be outside the tolerance band, provided the setting is conservative with respect to the NTSP. This provision is not applicable to Functions for which the second NOTE applies.McGuire Units 1 and 2 B 3.3.1-51 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.3.1.9 SR 3.3.1.9 is the performance of a TADOT. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program., The SR is modified by a Note that excludes verification of setpoints from the TADOT. Since this SR applies to RCP undervoltage and underfrequency relays, setpoint verification is accomplished during the CHANNEL CALIBRATION.
SR 3.3.1.10 The CHANNEL CALIBRATION may be performed at power or during refueling based on testing capability.
Channel unavailability evaluations in References 10 and 11 have conservatively assumed that the CHANNEL CALIBRAITON is performed at power with the channel in bypass.CHANNEL CALIBRATION is a complete check of the instrument loop, including the sensor. The test verifies that the channel responds to a measured parameter within the necessary range and accuracy.CHANNEL CALIBRATIONS must be performed consistent with the assumptions of the setpoint methodology.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.10 is modified by a Note stating that this test shall include verification that the time constants are adjusted to the prescribed values where applicable.
The applicable time constants are shown in Table 3.3.1-1.SR 3.3.1.11 SR 3.3.1.11 is the performance of a CHANNEL CALIBRATION, as described in SR 3.3.1.10.
Two notes modify this SR. Note 1 states that neutron detectors are excluded from the CHANNEL CALIBRATION.
The CHANNEL CALIBRATION for the power range neutron detectors consists of a normalization of the detectors based on a power calorimetric and flux map performed above 15% RTP. The high McGuire Units 1 and 2 B 3.3.1-52 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued) voltage detector saturation curve is evaluated and compared to the manufacturer's data. The Westinghouse-supplied boron-triflouride (BF 3)source range neutron detectors and compensated ion chamber intermediate range neutron detectors are being replaced with Thermo Scientific-supplied fission chamber source and intermediate range neutron detectors.
The CHANNEL CALIBRATION for the BF 3 source range neutron detectors consists of two methods. Method 1 consists of obtaining the discriminator curves for source range, evaluating those curves, and comparing the curves to the manufacturer's data (adjustments to the discriminator voltage are performed as required).
Method 2 consists of performing waveform analysis.
This analysis process monitors the actual number and amplitude of the Neutron/Gamma pulses being generated by the SR detector.
The high voltage is adjusted to optimize the amplitude of the pulses while maintaining as low as possible high voltage value in order to prolong the detector life. The discriminator voltage is then adjusted, as required, to reasonably ensure that the neutron pulses are being counted by the source range instrumentation and the unwanted gamma pulses are not being counted as neutron pulses.The CHANNEL CALIBRATION for the compensated ion chamber intermediate range neutron detectors consists of the high voltage detector plateau for intermediate range, evaluating those curves, and comparing the curves to the manufacturer's data. The CHANNEL CALIBRATION for the fission chamber source and intermediate range neutron detectors consists of verifying that the channels respond correctly to test inputs with the necessary range and accuracy.Note 2 states that this Surveillance is not required for the NIS power range detectors for entry into MODE 2 or 1. Note 3 applies to the compensated ion chamber intermediate range neutron detectors, and states that this Surveillance is not required to be performed for entry into MODE 2 or 1. Notes 2 and 3 are required because the unit must be in at least MODE 2 to perform the test for the compensated ion chamber intermediate range detectors and MODE 1 for the power range detectors.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions" (Reference
- 12) has been implemented, this SR is modified by two Notes as identified in Table 3.3.1-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value.McGuire Units 1 and 2 B 3.3.1-53 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology.
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. The performance of these channels will be evaluated under the station's Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition for continued OPERABILITY.
The second Note requires that the as-left setting for the channel be returned to within the as-left tolerance of the Nominal Trip Setpoint (NTSP). Where a setpoint more conservative than the NTSP is used in the plant surveillance procedures (field setting), the as-left and as-found tolerances, as applicable, will be applied to the surveillance procedure setpoint.
This will ensure that sufficient margin to the Safety Limit and/or Analytical Limit is maintained.
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable.
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR. The NOMINAL TRIP SETPOINT definition includes a provision that would allow the as-left setting for the channel to be outside the tolerance band, provided the setting is conservative with respect to the NTSP. This provision is not applicable to Functions for which the second NOTE applies.SR 3.3.1.12 SR 3.3.1.12 is the performance of a CHANNEL CALIBRATION, as described in SR 3.3.1.10.
Calibration of the AT channels is required at the beginning of each cycle upon completion of the precision heat balance. RCS loop AT values shall be determined by precision heat balance measurements at the beginning of each cycle.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.1.13 SR 3.3.1.13 is the performance of a COT of RTS interlocks.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Units 1 and 2 B 3.3.1-54 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.3.1.14 SR 3.3.1.14 is the performance of a TADOT of the Manual Reactor Trip and the SI Input from ESFAS' The test shall independently verify the OPERABILITY of the undervoltage and shunt trip mechanisms for the Manual Reactor Trip Function for the Reactor Trip Breakers and Reactor Trip Bypass Breakers.
The Reactor Trip Bypass Breaker test shall include testing of the automatic undervoltage trip.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.The SR is modified by a Note that excludes verification of setpoints from the TADOT. The Functions affected have no setpoints associated with them.SR 3.3.1.15 SR 3.3.1.15 is the performance of a TADOT of Turbine Trip Functions.
This TADOT is as described in SR 3.3.1.4, except that this test is performed prior to reactor startup. A Note states that this Surveillance is.not required if it has been performed within the previous 31 days.Verification of the Trip Setpoint does not have' to be performed for this Surveillance.
Performance of this test will ensure that the turbine trip Function is OPERABLE prior to taking the reactor critical.
This test cannot be performed with the reactor at power and must therefore be performed prior to reactor startup.SR 3.3.1.16 and SR 3.3.1.17 SR 3.3.1.16 and SR 3.3.1.17 verify that the individual channel/train actuation response times are less than or equal to the maximum values assumed in the accident analysis.
Response time testing acceptance criteria are included in the UFSAR (Ref. 1). Individual component response times are not modeled in the analyses.The analyses model the overall or total elapsed time, from the point at which the parameter exceeds the trip setpoint value at the sensor to the point at which the equipment reaches the required functional state (i.e.,'control and shutdown rods fully inserted in the reactor~core).
For channels that include dynamic transfer Functions (e.g., lag, lead/lag, rate/lag, etc.), the response time test may be performed with the transfer McGuire Units 1 and 2 B 3.3.1-55 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
Function set to one, with the resulting measured response time compared to the appropriate UFSAR response time. Alternately, the response time test can be performed with the time constants set to their nominal value, provided the required response time is analytically calculated assuming the time constants are set at their nominal values. The response time may be measured by a series of overlapping tests such that the entire response time is measured.Response time may be verified by actual response time tests in any series of sequential, overlapping or total channel measurements, or by the summation of allocated sensor, signal processing and actuation logic response times with actual response time tests on the remainder of the channel. Allocations for sensor response times may be obtained from: (1) historical records based on acceptable response time tests (hydraulic, noise, or power interrupt tests), (2) in place, onsite, or offsite (e.g., vendor) test measurements, or (3) utilizing vendor engineering specifications.
WCAP-13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" provides the basis and methodology for using allocated sensor response times in the overall verification of the channel response time for specific sensors identified in the'WCAP.
Response time verification for other sensor types must be either demonstrated by test, or their equivalency to those listed in WCAP-13632-P-A, Revision 2. Any demonstration of equivalency must have been determined to be acceptable by NRC staff review.WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests' provides the basis and methodology for using allocated signal processing and actuation logic response times in the overall verification of the protection system channel response time.The allocations for sensor, signal conditioning, and actuation logic response times must be verified prior to placing the component in operational service and re-verified following maintenance that may adversely affect response time. In general, electrical repair work does not impact response time provided the parts used for repair are of the same type and value. Specific components identified in the WCAP may be replaced without verification testing. One example where response time could be affected is replacing the sensing assembly of a transmitter.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Units 1 and 2 B 3.3.1-56 Revision No. 124 RTS Instrumentation B 3.3.1 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.3.1.16 is modified by a Note stating that neutron detectors are excluded from RTS RESPONSE TIME testing. This Note is necessary because of the difficulty in generating an appropriate detector input signal. Excluding the detectors is acceptable because the principles of detector operation ensure a virtually instantaneous response.
The response time of the neutron flux signal portion of the channel shall be measured from detector output or input of the first electronic component in the channel.REFERENCES
- 1. UFSAR, Chapter 7.2. UFSAR, Chapter 6.3. UFSAR, Chapter 15.4. IEEE-279-1971.
- 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii).
- 7. WCAP-10271-P-A, Supplement 2, Rev. 1, June 1990.8. WCAP 13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" Sep., 1995.9. WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests" Oct., 1998.10. WCAP-14333-P-A, Revision 1, October 1998.11. WCAP-15376-P-A, Revision 1, March 2003.12. Technical Specification Task Force, Improved Standard Technical Specifications Change Traveler, TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions", Revision 4.McGuire Units 1 and 2 B 3.3.1-57 Revision No. 124 ESFAS Instrumentation B 3.3.2 B 3.3 INSTRUMENTATION B 3.3.2 Engineered Safety Feature Actuation System (ESFAS) Instrumentation BASES BACKGROUND The ESFAS initiates necessary safety systems, based on the values of selected unit parameters, to protect against violating core design limits and the Reactor Coolant System (RCS) pressure boundary, and to mitigate accidents.
The ESFAS instrumentation is segmented into three distinct but interconnected modules as identified below: Field transmitters or process sensors and instrumentation:
provide a measurable electronic signal based on the physical characteristics of the parameter being measured: Signal processing equipment including analog protection system, field contacts, and protection channel sets: provide signal conditioning, bistable setpoint comparison, process algorithm actuation, compatible electrical signal output to protection system devices, and control board/control room/miscellaneous indications; and Solid State Protection System (SSPS) including input, logic, and output bays: initiates the proper unit shutdown or engineered safety feature (ESF) actuation in accordance with the defined logic and based on the bistable outputs from the signal process control and protection system.Field Transmitters or Sensors To meet the design demands for redundancy and reliability, more than one, and often as many as four, field transmitters or sensors are used to measure unit parameters.
In many cases, field transmitters or sensors that input to the ESFAS are shared with the Reactor Trip System (RTS).In some cases, the same channels also provide control system inputs.To account for calibration tolerances and instrument drift, which is assumed to occur between calibrations, statistical allowances are provided in the NOMINAL TRIP SETPOINT and Allowable Values. The OPERABILITY of each transmitter or sensor can be evaluated when its"as found" calibration data are compared against its documented acceptance criteria.McGuire Unit 1 and 2 B 3.3.2-1 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES BACKGROUND (continued)
Sigqnal Processing Equipment Generally, three or four channels of process control equipment are used for the signal processing of unit parameters measured by the field instruments.
The process control equipment provides signal conditioning, comparable output signals for instruments located on the main control board, and comparison of measured input signals with setpoints established by safety analyses.
These setpoints are defined in UFSAR, Chapter 6 (Ref. 1), Chapter 7 (Ref. 2), and Chapter 15 (Ref. 3). If the measured value of a unit parameter exceeds the predetermined setpoint, an output from a bistable is forwarded to the SSPS for decision logic processing.
Channel separation is maintained up to and through the input bays. However, not all unit parameters require four channels of sensor measurement and signal processing.
Some unit parameters provide input only to the SSPS, while others provide input to the SSPS, the main control board, the unit computer, and one or more control systems.Generally, if a parameter is used only for input to the protection circuits, three channels with a two-out-of-three logic are sufficient to provide the required reliability and redundancy.
If one channel fails in a direction that would not result in a partial Function trip, the Function is still OPERABLE with a two-out-of-two logic. If one channel fails such that a partial Function trip occurs, a trip will not occur and the Function is still OPERABLE with a one-out-of-two logic.Generally, if a parameter is used for input to the SSPS and a control function, four channels with a two-out-of-four logic are sufficient to provide the required reliability and redundancy.
The circuit must be able to withstand both an input failure to the control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
Again, a single failure will neither cause nor prevent the protection function actuation.
These requirements are described in IEEE-279-1971 (Ref. 4). The actual number of channels required for each unit parameter is specified in the UFSAR.Trip Setpoints and Allowable Values The NOMINAL TRIP SETPOINTS are the nominal values at which the bistables are set. Any bistable is considered to be properly adjusted when the "as left" value is within the band for CHANNEL CALIBRATION tolerance.
McGuire Unit 1 and 2 B 3.3.2-2 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES BACKGROUND (continued)
The NOMINAL TRIP SETPOINTS used in the bistables are based on the analytical limits (Ref. 1, 2, and 3). The selection of these NOMINAL TRIP SETPOINTS is such that adequate protection is provided when all sensor and processing time delays, calibration tolerances, instrumentation uncertainties, instrument drift, and severe environment errors for those ESFAS channels that must function in harsh environments as defined by 10 CFR 50.49 (Ref. 5) are taken into account. The actual as-left Setpoint entered into the bistable assures that the actual trip occurs before the Allowable Value is reached. The Allowable Value accounts for changes in random measurement errors detectable by a COT. One example of such a change in measurement error is drift during the surveillance interval.
If the point at which the loop trips does not exceed the Allowable Value, the loop is considered OPERABLE.A trip within the Allowable Value ensures that the consequences of Design Basis Accidents (DBAs) will be acceptable, providing the unit is operated from within the LCOs at the onset of the DBA and the equipment functions as designed.Each channel can be tested on line to verify that the signal processing equipment and setpoint accuracy is within the specified allowance requirements.
Once a designated channel is taken out of service for testing, a simulated signal is injected in place of the field instrument signal. The process equipment for the channel in test is then tested, verified, and calibrated.
SRs for the channels are specified in. the SR section.The NOMINAL TRIP SETPOINTS and Allowable Values listed inTable 3.3.2-1 incorporates all, of the known uncertainties applicable for each channel. The magnitudes of these uncertainties are factored into the determination of each NOMINAL TRIP SETPOINT.
All field sensors and signal processing equipment for these channels are assumed to operate within the allowances of these uncertainty-magnitudes.
Solid State Protection System The SSPS equipment is used for the decision logic processing of outputs from the signal processing equipment bistables.
To meet the redundancy requirements, two trains of SSPS, each performing the same functions, are provided.
If one train is taken out of service for maintenance or test purposes, the second train will provide ESF actuation for the unit. If both trains are taken out of service or placed in test, a reactor trip will result.Each train is packaged in its own cabinet for. physical and electrical separation to satisfy separation and independence requirements.
Revision No., 122 McGuire Unit 1 and 2 B 3.3.2-3 .,
ESFAS Instrumentation B 3.3.2 BASES BACKGROUND (continued), The SSPS performs the decision logic for most ESF equipment actuation; generates the electrical output signals that initiate the required actuation;'
and provides the status, permissive, and annunciator output signals to the main control room of the unit.The bistable outputs from the signal processing equipment are sensed by the SSPS equipment and combined into logic matrices that represent combinations indicative of various transients.
If a required logic matrix combination is completed, the system will send actuation signals via master and slave relays to those components whose aggregate Function best serves to alleviate the condition and restore the unit to a safe condition.
Examples are given in the Applicable Safety Analyses, LCO, and Applicability sections of this Bases.Each SSPS train has a built in testing device that can test the decision logic matrix functions and the actuation devices while the unit is at power.When any one train is taken out of service for testing, the other train is capable of providing unit monitoring and protection'until the testing has been completed.
The testing device is semiautomatic to minimize testing time.The actuation of ESF components is accomplished through master and slave relays. The SSPS energizes the master relays appropriate for the condition of the unit. Each master relay then energizes one or more slave relays, which then cause actuation of the end devices. The master and slave relays are routinely tested to ensure operation.
The test of the master relays energizes the relay, which then operates the contacts and applies a low voltage to the associated slave relays. The low voltage is not sufficient to actuate the slave relays but only demonstrates signal path continuity.
The SLAVE RELAY TEST actuates the devices if their operation will not interfere with continued unit operation.
For the latter case, actual component operation is prevented by the SLAVE RELAY TEST circuit, and slave relay contact operation is verified by a continuity check of the circuit containing the slave relay.APPLICABLE Each of the analyzed accidents can be detected by one or more ESFAS SAFETY ANALYSES, Functions.
One of the ESFAS Functions is the primary actuation signal LCO, and for that accident.
An ESFAS Function may be the primary actuation APPLICABILITY signal for more than one type of accident.
An ESFAS Function may also be a secondary, or backup, actuation signal for one or more other accidents.
Functions such as manual initiation, not specifically credited in the accident safety analysis, McGuire Unit 1 and 2 B 3.3.2-4 Revision No. 122 ESFAS Instrumentation B.3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) are qualitatively credited in the safety analysis and the NRC staff approved licensing basis for the unit. These Functions may provide protection for conditions that do not require dynamic transient analysis to demonstrate Function performance.
These Functions may also serve as backups to Functions that were credited in the accident analysis (Ref. 3).The LCO, requires all instrumentation performing an ESFAS Function to be OPERABLE.
Failure of any instrument renders the affected channel(s) inoperable and reduces the reliability of the affected Functions.
The LCO generally requires OPERABILITY of three or four channels in each instrumentation function and two channels in each logic and manual initiation function.
The two-out-of-three and the two-6ut-of-four configurations allow one channel to be tripped during maintenance or.testing without causing an ESFAS initiation.
Two logic or manual initiation channels are required toensure no single random failure disables the ESFAS.The required channels of ESFAS instrumentation provide unit protection.
in the event of any of the analyzed accidents.
ESFAS -protection functions are as follows: 1. Safety Iniection Safety Injection (SI) provides two primary functions:, 1. Primary side water addition, to ensure maintenance or recovery of reactor vessel water level (coverage of the active fuel for heat.removal, clad integrity, and for limiting peak clad temperature to < 2200 0 F); and 2. Boration to ensure recoveryý and maintenance of SDM (keff,< 1.0).These functions are necessary to mitigate the effects of high'energy line breaks (HELBs) both inside and outside. of containment.
The SI signal is also used to initiate other Functions such as:* Phase A Isolation;
- ,Containment Purge and Exhaust Isolation; McGuire Unit 1 and 2 B 3.3.2-5 'Revision No. 12ý ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- Reactor Trip;* Turbine Trip;* Feedwater Isolation;
- Start of motor driven auxiliary feedwater (AFW) pumps;* Control room area ventilation isolation;
- Enabling automatic switchover of Emergency Core Cooling Systems (ECCS) suction to containment sump;* Start of annulus ventilation system filtration trains;* Start of auxiliary building filtered ventilation exhaust system trains;* Start of diesel generators;
- Start of nuclear service water system pumps; and* Start-of component cooling water system pumps.These other functions ensure:* Isolation of nonessential systems through containment penetrations;
- Trip of the turbine and reactor to limit power generation;
- Isolation of main feedwater (MFW) to limit secondary side mass losses;* Start of AFW to ensure secondary side cooling capability;
- Isolation of the control room to ensure habitability;
- Enabling ECCS suction from the refueling water storage tank (RWST) switchover on low RWST level to ensure continued cooling via use of the containment sump;* Starting of annulus ventilation and auxiliary building filtered ventilation to limit offsite releases;McGuire Unit 1 and 2 B 3.3.2-6 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Starting of diesel generators for loss of offsite power considerations; and Starting of component cooling water and nuclear service water systems for heat removal.a. 'Safety Iniection-Manual Initiation The LCO requires one channel per train to be OPERABLE.The operator can'initiate SI at any time by using either of two switches in the control room. This action will cause actuation of all components in the same manner as any of the automatic actuation signals.The LCO for the Manual Initiation Function ensures the proper amount of redundancy is maintained in the manual ESFAS actuation circuitry to ensure the operator has manual ESFAS initiation capability.
Each train consists of one push button and the interconnecting wiring to the actuation logic cabinet. This configuration does not allow testing at power.b. Safety Iniection-Automatic Actuation Logic and Actuation Relays This LCO requires two trains to be OPERABLE.
Actuation logic consists of all circuitry housed within the actuation subsystems, including the initiating relay contacts responsible for actuating the ESF equipment.
Manual and automatic initiation of SI must be OPERABLE in MODES 1, 2, and 3. In these MODES, there is sufficient energy in the primary and secondary systems to warrant automatic initiation of ESF systems. In MODE 4, adequate time is available to manually actuate required components in the event of a DBA, but because of the large number of components actuated on a SI, actuation is simplified by the use of the manual actuation push buttons. Automatic actuation logic and actuation relays must be OPERABLE in MODE 4 to support system level manual initiation.
McGuire Unit 1 and 2.B 3.3.2-7 Revision No.. 122 ESFAS Instrumentation.
B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
These Functions are not required to be OPERABLE in MODES 5 and 6 because there is adequate time for the operator to evaluate unit conditions and respond by manually starting individual systems, pumps, and other equipment to mitigate the consequences of an abnormal condition or accident.
Unit pressure and temperature are very low and many ESF components are administratively locked out or otherwise prevented from actuating to prevent inadvertent overpressurization of unit systems.c. Safety Iniection-Containment Pressure-High This signal provides protection against the following accidents:
- SLB inside containment;
- LOCA; and Feed line break inside containment.
Containment Pressure-High provides no input to any control functions.
Thus, three OPERABLE channels are sufficient to satisfy protective requirements with a two-out-of-three logic.Containment Pressure-High must be OPERABLE in MODES 1, 2, and 3 when there is sufficient energy in the primary and secondary systems to pressurize the containment following a pipe break. In MODES 4, 5, and 6, there is insufficient energy in the primary or secondary systems to pressurize the containment.
- d. Safety Iniection-Pressurizer Pressure-Low Low This signal provides protection against the following accidents:
- Inadvertent opening of a steam generator (SG) relief or safety valve;* SLB;A spectrum of rod cluster control assembly ejection accidents (rod ejection);
McGuire Unit 1 and 2 B 3.3.2-8 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- Inadvertent opening of a pressurizer relief or safety valve;LOCAs; and* SG Tube Rupture.Pressurizer pressure provides both control and protection functions:
input to the Pressurizer Pressure Control System, reactor trip, and SI. Therefore, the actuation logic must be able to withstand both an input failure to control system, which may then require the protection function actuation, and a single failure in the other channels providing the protection function actuation.
Thus, four OPERABLE channels are required to satisfy the requirements with a two-out-of-four logic.This Function must be OPERABLE in MODES 1, 2, and 3 (above P-11) to mitigate the consequences of an HELB inside containment.
This signal may be manually blocked by the operator below the P-1 1 setpoint.
Automatic SI actuation below this pressure setpoint is then performed by the Containment Pressure-High signal.This Function is not required to be OPERABLE in MODE 3 below the P-1i1 setpoint.
Other ESF functions'are used to detect accident conditions and actuate the ESF systems in this MODE. In MODES 4, 5, and 6, this Function is not needed for accident detection and mitigation.
- 2. Containment Spray Containment Spray provides two primary functions:
- 1. Lowers containment pressure and temperature after an HELB in containment; and 2. Reduces the amount of radioactive iodine in the containment atmosphere.
These functions are necessary to: Ensure the pressure boundary integrity of the containment structure; and McGuire Unit 1 and 2 B 3.3.2-9 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Limit the release of radioactive iodine to the environment in the event of a failure of the containment structure.
After the RHR pumps have been aligned for containment sump recirculation, containment spray pumps are aligned to the sump.Once adequate sump level and containment pressure above 3 PSIG have been confirmed, one spray pump is manually started.The second train of containment spray is available in the event of the failure of the first train.3. Containment Isolation Containment Isolation provides isolation of the containment atmosphere, and all process systems that penetrate containment, from the environment.
This Function is necessary to prevent or limit the release of radioactivity to the environment in the event of a large break LOCA.There are two separate Containment Isolation signals, Phase A and Phase B. Phase A isolation isolates all automatically isolable process lines, except component cooling water (CCW) and Nuclear Service Water System (NSWS) to RCP motor air coolers, at a relatively low containment pressure indicative of primary or secondary system leaks. For these types of events, forced circulation cooling using the reactor coolant pumps (RCPs) and SGs is the preferred (but not required) method of decay heat removal. Since CCW and NSWS are required to support RCP operation, not isolating CCW and NSWS on the low pressure Phase A signal enhances unit safety by allowing operators to use forced RCS circulation to cool the unit. Isolating CCW and NSWS on the low pressure signal may force the use of feed and bleed cooling, which could prove more difficult to control.Phase A containment isolation is actuated automatically by SI, or manually via the actuation circuitry.
All process lines penetrating containment, with the exception of CCW and NSWS are isolated.CCW is not isolated at this time to permit continued operation of the RCPs with cooling water flow to the thermal barrier heat exchangers and air or oil coolers. All process lines not equipped with remote operated isolation valves are manually closed, or otherwise isolated, prior to reaching MODE 4.McGuire Unit 1 and 2 B 3.3.2-10 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Manual Phase A Containment Isolation is accomplished by either of two switches in the control room. Either switch actuates its associated train.The Phase B signal isolates CCW and NSWS. This occurs at a relatively high containment pressure that is indicative of a large break LOCA or an SLB. For these events, forced circulation using the RCPs is no longer desirable.
Isolating the CCW and NSWS at the higher pressure does not pose a challenge to the containment boundary because the CCW System and NSWS are closed loops inside containment.
Although some system components do not meet all of the ASME Code requirements applied to the containment itself, the systems are continuously pressurized to a pressure greater than the Phase B setpoint.
Thus, routine operation demonstrates the integrity of the system pressure boundary for pressures exceeding the Phase B setpoint.Furthermore, because system pressure exceeds the Phase B setpoint, any system leakage prior to initiation of Phase B isolation would be into containment.
Therefore, the combination of CCW System and NSWS design and Phase B isolation ensures there is not a potential path for radioactive release from containment.
Phase B containment isolation is actuated by Containment Pressure-High High, or manually, via the automatic actuation logic, as previously discussed.
For containment pressure to reach a value high enough to actuate Containment Pressure-High High, a LOCA or SLB must have occurred.
RCP operation will no longer be required and CCW to the RCPs and NSWS to the RCP motor coolers is, therefore, no longer necessary.
The RCPs can be operated with seal injection flow alone and without CCW flow to the thermal barrier heat exchanger.
McGuire Unit 1 and 2 B 3.3.2-11 Revision No.. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Manual Phase B Containment Isolation is accomplished by pushbuttons on the Main Control Board.a. Containment Isolation-Phase A Isolation (1) Phase A Isolation-Manual Initiation Manual Phase A Containment Isolation is actuated by either of two switches in the control room. Either switch actuates both trains.(2) Phase A Isolation-Automatic Actuation Logic and Actuation Relays Automatic Actuation Logic and Actuation Relays consist of the same features and operate in the same manner as described for ESFAS Function 1 .b.Manual and automatic initiation of Phase A Containment Isolation must be OPERABLE in MODES 1, 2, and 3, when there is a potential for an accident to occur. In MODE 4, adequate time is available to manually actuate required components in the event of a DBA, but because of the large number of components actuated on a Phase A Containment Isolation, actuation is simplified by the use of the manual actuation push buttons. Automatic actuation logic and actuation relays must be OPERABLE in MODE 4 to support system level manual initiation.
In MODES 5 and 6, there is insufficient energy in the primary or secondary systems to pressurize the containment to require Phase A Containment Isolation.
There also is adequate time for the operator to evaluate unit conditions and manually actuate individual isolation valves in response to abnormal or accident conditions.
McGuire Unit 1 and 2 B 3.3.2-12 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
(3) Phase A Isolation-Safety Iniection Phase A Containment Isolation is also initiated by all Functions that initiate SI. The Phase A Containment Isolation requirements for these Functions are the same as the requirements for their SI function.Therefore, the requirements are not repeated in Table 3.3.2-1. Instead, Function 1, SI, is referenced for all initiating Functions and requirements.
- b. Containment Isolation-Phase B Isolation Phase B Containment Isolation is accomplished by Manual Initiation, Automatic Actuation Logic and Actuation Relays, and by Containment Pressure channels The Containment Pressure trip of Phase B Containment Isolation is energized to trip in order to minimize the potential of spurious trips that may damage the RCPs.(1) Phase B Isolation-Manual Initiation (2) Phase B Isolation-Automatic Actuation Logic and Actuation Relays Manual and automatic initiation of Phase B containment isolation must be OPERABLE in MODES 1, 2, and 3, when there is a potential for an accident to occur. In MODE 4, adequate time is available to manually actuate required components in the event of a DBA. However, because of the large number of components actuated on a Phase B containment isolation, actuation is simplified by the use of the manual actuation push buttons. Automatic actuation logic and actuation relays must be OPERABLE in MODE 4 to support system level manual initiation.
In MODES 5 and 6, there is insufficient energy in the primary or secondary systems to pressurize the containment to require McGuire Unit 1 and 2 B 3132-13 Revision'No.
122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Phase B containment isolation.
There also is adequate time for the operator to evaluate unit conditions and manually actuate individual isolation valves in response to abnormal or accident conditions.
(3) Phase B Isolation-Containment Pressure -High High The basis for containment pressure MODE applicability is as discussed for ESFAS Function 2.c above.4. Steam Line Isolation Isolation of the main steam lines provides protection in the event of an SLB inside or outside containment.
Rapid isolation of the steam lines will limit the steam break accident to the blowdown from one SG, at most. For an SLB upstream of the main steam isolation valves (MSlVs), inside or outside of-containment, closure of the MSIVs limits the accident to the blowdown from only the affected SG. For an SLB downstream of the MSIVs, closure of the MSIVs terminates the accident as soon as the steam lines depressurize.
Steam Line Isolation also mitigates the effects of a feed line break and ensures a source of steam for the turbine driven AFW pump during a feed line break.a. Steam Line Isolation-Manual Initiation Manual initiation of Steam Line Isolation can be accomplished from the control room. There are two system level switches in the control room and either switch can initiate action to immediately close all MSIVs. The LCO requires two channels to be OPERABLE.
Individual valves may also be closed using individual hand switches in the control room. The LCO requires four individual channels to be OPERABLE.b. Steam Line Isolation-Automatic Actuation Logic and Actuation Relays Automatic actuation logic and actuation relays consist of the same features and operate in the same manner as described for ESFAS Function 1.b.McGuire Unit 1 and 2 B 3.3.2-14 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Manual and automatic initiation of steam line isolation must be OPERABLE in MODES 1, 2, and 3 when there is sufficient energy in the RCS and SGs to have an SLB or other accident.
This could result in the release of significant quantities of energy and cause a cooldown of the primary system. The Steam Line Isolation Function is required in MODES 2 and 3 unless all MSIVs are closed and de-activated.
In MODES 4, 5, and 6, there is insufficient energy in the RCS and SGs to experience an SLB or other accident releasing significant quantities of energy.c. Steam Line Isolation-Containment Pressure-High High This Function actuates closure of the MSIVs in the. event of a LOCA or an SLB inside containment to maintain three unfaulted SGs as a heat sink for the reactor, and to limit the mass and energy release to containment.
The Containment Pressure -High High function is described in ESFAS Function 2.C.Containment Pressure-High High must be OPERABLE in MODES 1, 2, and 3, when there is sufficient energy in the primary and secondary side to pressurize the containment following a pipe break. This would cause a significant increase in the containment pressure, thus allowing detection and closure of the MSIVs. The Steam Line Isolation Function remains OPERABLE in MODES 2 and 3 unless all MSIVs are closed and de-activated.
In MODES 4, 5, and 6, there is not enough energy in the primary and secondary sides to pressurize the containment to the Containment Pressure-High High setpoint.d. Steam Line Isolation-Steam Line Pressure (1) Steam Line Pressure-Low Steam Line Pressure-Low provides closure of the MSIVs in the event of an SLB to maintain three unfaulted SGs as a heat sink for the reactor, and to limit the mass and energy release to containment.
This Function provides closure of the MSIVs in the event of a feed line break to ensure a supply of steam for the turbine driven AFW pump.McGuire Unit 1 and 2 B 3.3.2-15 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Steam Line Pressure-Low Function must be OPERABLE in MODES 1, 2, and 3 (above P-11), with any main steam valve open, when a secondary side break or stuck open valve could result in the rapid depressurization of the steam lines. This signal may be manually blocked by the operator below the P-11 setpoint.
Below P-1i1, an inside containment SLB will be terminated by automatic actuation via Containment Pressure-High High. Stuck valve transients and outside containment SLBs will be terminated by the Steam Line Pressure-Negative Rate-High signal for Steam Line Isolation below P-1 1 when Steam Line Isolation Steam Line Pressure-Low has been manually blocked. The Steam Line Isolation Function is required in MODES 2 and 3 unless all MSIVs are closed and de-activated.
This Function is not required to be OPERABLE in MODES 4, 5, and 6 because there is insufficient energy in the secondary side of the unit to have an accident.(2) Steam Line Pressure-Negative Rate-High Steam Line Pressure-Negative Rate-High provides closure of the MSIVs for an SLB when less than the P-1 1 setpoint, to maintain at least one unfaulted SG as a heat sink for the reactor, and to limit the mass and energy release to containment.
When the operator manually blocks the Steam Line Pressure-Low main steam isolation signal when less than the P-1 1 setpoint, the Steam Line Pressure-Negative Rate-High signal is automatically enabled. Steam Line Pressure-Negative Rate-High provides.
no input to anycontrol functions.
Thus, three OPERABLE channels are sufficient to satisfy , requirements with a two-out-of-three logic on each steam line.Steam Line Pressure-Negative Rate-High must be OPERABLE in MODE 3 when less than the P-1 1 setpoint, when a secondary side break or stuck open valve could result in the rapid depressurization of the steam line(s). In MODES 1 and 2, and in MODE 3, when above the P-1 1 setpoint, this signal is automatically disabled and the Steam Line Pressure-Low signal is automatically enabled. The Steam Line Isolation Function is required to be OPERABLE in McGuire Unit 1 and 2 B 3.3.2-16 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
MODES 2 and 3 unless all MSIVs are closed and de-activated.
In MODES 4, 5, and 6, there is insufficient energy in the primary and secondary sides to have an SLB or other accident that would result in a release of significant enough quantities of energy to cause a cooldown of the RCS.5. Turbine Trip and Feedwater Isolation The primary functions of the Turbine Trip and Feedwater Isolation signals are to prevent damage to the turbine due to water in the steam lines, stop the excessive flow of feedwater into the SGs, and to limit the energy released into containment.
These Functions are necessary to mitigate the effects of a high water level in the SGs, which could result in carryover of water into the steam lines and excessive cooldown of the primary system. The SG high water level is due to excessive feedwater flows. Feedwater isolation serves to limit the energy released into containment upon a feedwater line or steam line break inside containment.
The Functions are actuated when the level in any SG exceeds the high high setpoint, and performs the following functions:
- Trips the main turbine;* Trips the MFW pumps; and Initiates feedwater isolation (shuts the MFW control valves, bypass feedwater control valves, feedwater isolation valves, and the MFW to AFW nozzle bypass valves).Turbine Trip and Feedwater Isolation signals are both actuated by SG Water Level-High High, or by an SI signal. The RTS also initiates a turbine trip signal whenever a reactor trip (P-4) is generated.
A, Feedwater Isolation signal is also generated by a reactor trip (P-4)coincident with Tavg-Low and on a high water level in the reactor building doghouse.
The MFW System is also taken out of operation and the AFW System is automatically started. The SI signal was discussed previously.
- a. Turbine Trip (1) Turbine Trip-Automatic Actuation Logic and Actuation Relays Automatic Actuation Logic and Actuation Relays consist of McGuire Unit 1 and 2 B 3.3.2-17 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) the same features and operate in the same manner as described for ESFAS Function 1.b.(2) Turbine Trip-Steam Generator Water Level-High Hi-qh This signal prevents damage to the turbine due to water in the steam lines. The ESFAS SG water level instruments provide input to the SG Water Level Control System. Therefore, the actuation logic must be able to withstand both an input failure to the control system (which may then require the protection function actuation) and a single failure in the other channels providing the protection function actuation.
Only three protection channels are necessary to satisfy the protective requirements.
The setpoints are based on percent of narrow range instrument span.(3) Turbine Trip-Safety Iniection Turbine Trip is also initiated by all Functions that initiate SI. Therefore, the requirements are not repeated in Table 3.3.2-1. Instead Function 1, SI, is referenced for all initiating functions and requirements.
Item 5.a.(1) is referenced for the applicable MODES.The Turbine Trip Function must be OPERABLE in MODES 1 and 2. In lower MODES, the turbine generator is not in service and this Function is not required to be OPERABLE.b. Feedwater Isolation (1) Feedwater Isolation-Automatic Actuation Logic and Actuation Relays Automatic Actuation Logic and Actuation Relays consist of the same features and operate in the same APPLICABLE manner as described for ESFAS Function 1 .b.McGuire Unit 1 and 2 B 3.3.2-18 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
(2) Feedwater Isolation-Steam Generator Water Level-Hi-gh High (P-14)This signal provides protection against excessive feedwater flow. The ESFAS SG water level instruments provide input to the SG Water, Level Control System. Therefore, the actuation logic must be able to withstand both an input failure to the control system (which may then require the protection function actuation) and a single failure in the other channels providing the protection function actuation.
Only three protection channels are necessary to satisfy the protective requirements.
The setpoints are based on percent of narrow range instrument span.(3) Feedwater Isolation-Safety Iniection Feedwater Isolation is also initiated by all Functions that initiate SI. The Feedwater Isolation Function requirements for these Functions are the same as the requirements for their SI function.
Therefore, the requirements are not repeated in Table 3.3.2-1.Instead Function 1, SI, is referenced for all initiating functions and requirements.
Item 5.b.(1) is referenced for the applicable MODES.(4) Feedwater Isolation
-RCS Tap-Low Coincident With Reactor Trip (P-4)This signal provides protection against excessive cooldown, which could subsequently introduce a positive reactivity excursion after a plant trip. There are four channels of RCS Tavg-Low (one per loop), with a two-out-of-four logic required coincident with a reactor trip signal (P-4) to initiate a feedwater isolation.
The P-4 interlock is discussed in Function 8.a.(5), Turbine Trip and Feedwater Isolation
-Doghouse Water Level -High High This signal initiates a Feedwater Isolation.
The signal terminates forward feedwater flow in the event of a postulated pipe break in the main feedwater piping in the doghouses to prevent flooding safety related equipment essential to the safe shutdown of the plant.McGuire Unit 1 and 2B B 3.3.2-19 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
The level instrumentation consists of six level switches (three per train) in each of the two reactor building doghouses.
A high-high level detected by two-out-of-three switches in either train in the inboard or outboard doghouse will initiate a feedwater isolation.
This signal initiates Feedwater Isolation for the specific doghouse where the High-High level is detected and trips both main feedwater pumps thus causing a main turbine trip.The Feedwater Isolation Function must be OPERABLE in MODES 1 and 2 and also in MODE 3 (except for the functions listed in Table 3.3.2-1).Feedwater Isolation is not required OPERABLE when all MFIVs, MFCVs, and associated bypass valves are closed and de-activated or isolated by a closed manual valve. In lower MODES, the MFW System is not in service and this Function is not required to be OPERABLE.6. Auxiliary Feedwater The AFW System is designed to provide a secondary side heat sink for the reactor in the event that the MFW System is not available.
The system has two motor driven pumps and a turbine driven pump, making it available during normal and accident operation.
The normal source of water for'the AFW System is the non-safety related AFW Storage Tank (Water Tower). A low suction pressure to the AFW pumps will automatically realign the pump suctions to the Nuclear Service Water System'(NSWS)(safety related).
The AFWSystem is aligned so that'upon a pump start, flow is initiated to the respective SGs immediately.
- a. Auxiliary Feedwater-Automatic Actuation Logic and Actuation Relays Automatic actuation logic and actuation relays consist of the same features and operate in the same manner as described for ESFAS Function 1.b.b. Auxiliary Feedwater-'Steam Generator Water Level-Low Low SG Water Level-Low Low provides protection against a loss of heat sink. A feed line break, inside or outside of containment, or a loss of MFW, would result in a loss of SG water level. SG Water Level-Low Low provides input to the SG Level Control System.McGuire Unit 1 and 2 B 3.3.2-20 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Therefore, the actuation logic must be able. to withstand both an input failure to the control system which may then require a protection function actuation and a single failure in the, other channels providing the protection function actuation.
Thus, four OPERABLE channels are required to satisfy the requirements with two-out-of-four logic. The setpoints are based on percent of narrow range instrument span.SG Water Level -Low Low in any operating SG will cause the motor driven AFW pumps to start. The system is aligned so that upon a start of the pump, water immediately begins to flow to the SGs. SG Water Level -Low Low in any two operating SGs will cause the turbine driven pumps to start.c. Auxiliary Feedwater-Safety Iniection An SI signal starts the motor driven AFW pumps. The AFW initiation functions are the same as the requirements for their SI function.
Therefore, the requirements are not repeated in Table 3.3.2-1. Instead, Function 1, SI, is referenced for all initiating functions and requirements.
- d. Auxiliary Feedwater-Station Blackout A loss of power or degraded voltage to the service buses will be accompanied by a loss of reactor coolant pumping power and the subsequent need for some method of decay heat removal. The loss of power or degraded voltage is detected by a voltage drop on each essential service bus. Loss of power or degraded voltage to either essential service bus will start the turbine .driven and motor driven AFW pumps to ensure that at least two SGs contain enough water to serve as the heat sink for reactor decay heat and sensible heat removal following the reactor trip. The turbine driven pump does not start on a loss of power coincident with a SI signal.Functions 6.a through 6.d must be OPERABLE in MODES 1, 2, and 3 to ensure that the SGs remain the heat sink for the reactor. These Functions do not have to be OPERABLE in MODES 5 and 6 because there is not enough heat being generated in the reactor to require the SGs as a heat sink. In MODE 4, AFW actuation does not need to be OPERABLE because either AFW or residual heat removal (RHR) will already be in operation to remove decay heat or sufficient time is available to manually place either system in operation.
McGuire Unit 1 and 2 B 3.3.2-21 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- e. Auxiliary Feedwater-Trip of All Main Feedwater Pumps A Trip of all MFW pumps is an indication of a loss of MFW and the subsequent need for some method of decay heat and sensible heat removal to bring the reactor back to no load temperature and pressure.
Two contacts are provided in series (one from each MFW pump) in the starting circuit for each AFW pump. A trip of all MFW pumps closes both contacts and starts the motor driven AFW pumps to ensure that at least two SGs are available with water to act as the heat sink for the reactor., This function must be OPERABLE in MODES 1 and 2. This ensures that at least two SGs are provided with water to serve as the heat sink to remove reactor decay heat and sensible heat in the event of an accident.In MODES 3, 4, and 5, the MFW pumps are normally shut down, and thus neither pump trip is indicative of a condition requiring automatic AFW initiation.
- f. Auxiliary Feedwater-Pump Suction Transfer on Suction Pressure-Low A low pressure signal in the AFW pump suction line protects the AFW pumps against a loss of the normal supply of water for the pumps, the non-safety related AFW Storage Tank (Water Tower).Two pressure switches per train are located on the AFW pump suction line. The turbine driven AFW pump has a total of four switches.
A low pressure signal sensed by two-out-of-two switches on either train will cause the emergency supply of water for the pump to be aligned. The NSWS (safety grade) is then lined up to supply the AFW pumps to ensure an adequate supply of water for the AFW System to maintain at least two of the SGs as the heat sink for reactor decay heat and sensible heat removal.This Function must be OPERABLE in MODES 1, 2, and 3 to ensure a safety grade supply of water for the AFW System to maintain the SGs as the heat sink for the reactor. This Function does not have to be OPERABLE in MODES 5 and 6 because there is not enough heat being generated in the reactor to require the SGs as a heat sink. In MODE 4, AFW automatic suction transfer does not need to be OPERABLE because RHR will already be in operation, or sufficient time is available to place RHR in operation, to remove decay heat.McGuire Unit 1 and 2 B 3.3.2-22 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
- 7. Automatic Switchover to Containment Sump At the end of the injection phase of a LOCA, the RWST will be nearly empty. Continued cooling must be provided by the ECCS to remove decay heat. The source of water for the ECCS pumps is automatically switched to the containment recirculation sump. The low head residual heat removal (RHR) pumps and containment spray pumps draw the water from the containment recirculation sump, the RHR pumps pump the water through the RHR heat exchanger, inject the water back into the RCS, and supply the cooled water to the other ECCS pumps.Switchover from the RWST to the containment sump must occur before the RWST empties to prevent damage to the RHR pumps and a loss of core cooling capability.
- a. Automatic Switchover to Containment Sump-Refueling Water Storage Tank (RWST)Level-Low Coincident With Safety Iniection During the injection phase of a LOCA, the RWST is the source of water for all ECCS pumps. A low level in the RWST coincident with an SI signal provides protection against a loss of water forthe ECCS pumps and indicates the end of the injection phase of the LOCA. The RWST is equipped with three level transmitters.
, These transmitters provide no control functions.
Therefore, a two-out-of-three logic is adequate to initiate the protection function actuation.
Automatic switchover occurs only if the RWST low level signal is coincident with SI. This prevents accidental switchover during normal operation.
Accidental switchover could damage ECCS pumps if they are attempting to take suction from an empty sump.The automatic switchover Function requirements for the SI Functions are the same as the requirements for their SI function.Therefore, the requirements are not repeated in Table 3.3.2-1.Instead, Function 1, SI, is referenced for all initiating Functions and requirements.
These Functions must be OPERABLE in MODES 1, 2, and 3 when there is a potential for a LOCA to occur, to ensure a continued supply of water for the ECCS pumps. These Functions are not required to be OPERABLE in MODES 4, 5, and 6.because McGuire Unit 1 and 2 B 3.3.2-23 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued) there is adequate time for the operator to evaluate unit conditions and respond by manually starting systems, pumps, and other equipment to mitigate the consequences of an abnormal condition or accident.
System pressure and temperature are very low and many ESF components are administratively locked out or otherwise prevented from actuating to prevent inadvertent overpressurization of unit systems.8. Engqineered Safety Feature Actuation System Interlocks To allow some flexibility in unit operations, several interlocks are included as part of the ESFAS. These interlocks permit the operator to block some signals, automatically enable other signals, prevent some actions from occurring, and cause other actions to occur. The interlock Functions back up manual actions to ensure bypassable functions are in operation under the conditions assumed in the safety analyses.a. Enqineered Safety Feature Actuation System Interlocks-Reactor Trip, P-4 The P-4 interlock is enabled when a reactor trip breaker (RTB) and its associated bypass breaker is open. Operators are able to reset SI 60 seconds after initiation.
If a P-4 is present when SI is reset, subsequent automatic SI initiation will be blocked until the RTBs have been manually closed. This Function allows operators to take manual control of SI systems after the initial phase of injection is complete while avoiding multiple SI initiations.
The functions of the P-4 interlock are: Trip the main turbine;Isolate MFW with coincident low Tavg;Prevent reactuation of SI after a manual reset of SI; and Prevent opening of the MFW isolation valves if they were closed on SI or SG Water Level-High High.McGuire Unit 1 and 2 B 3.3.2-24 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
Each of the above Functions is interlocked with P-4 to avert or reduce the continued cooldown of the RCS following a reactor trip.An excessive cooldown of the RCS following a reactor trip could cause an insertion of positive reactivity with a subsequent increase in generated power. To avoid such a situation, the noted Functions have been interlocked with P-4 as part of the design of the unit control and protection system.None of the noted Functions serves a mitigation function in the unit licensing basis safety analyses.
Only the turbine trip Function is explicitly assumed since it is an immediate consequence of the reactor trip Function.
Neither turbine trip, nor any of the other three Functions associated with the reactor trip signal, is required to show that the unit licensing basis safety analysis acceptance criteria are not exceeded.The RTB position switches that provide input to the P-4 interlock only function to energize.
or de-energize or open or close contacts.Therefore, this Function has no adjustable trip setpoint with which to associate a Trip Setpoint and Allowable Value.This Function must be OPERABLE in MODES 1, 2, and 3 when the reactor may be critical or approaching criticality.
This Function does not have to be OPERABLE in MODE 4, 5, or 6 because the main turbine, the MFW System are not in operation.
- b. Engineered Safety Feature Actuation System Interlocks-Pressurizer Pressure, P-i 1 The P-1 1 interlock permits a normal unit cooldown and depressurization without actuation of SI or main steam line isolation.
With two-out-of-three pressurizer pressure channels (discussed previously) less than the P-1i1 setpoint, the operator can manually block the Pressurizer Pressure-Low SI signal and the Steam Line Pressure-Low steam line isolation signal (previously discussed).
McGuire Unit 1 and 2 B 3.3.2-25 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
When the Steam Line Pressure-Low steam line isolation signal is manually blocked, a main steam isolation signal on Steam Line Pressure-Negative Rate-High is enabled. This provides protection for an SLB by closure of the MSIVs. With two-out-of-three pressurizer pressure channels above the P-11 setpoint, the Pressurizer Pressure-Low SI signal and the Steam Line Pressure-Low steam line isolation signal are automatically enabled. The operator can also enable these trips by use of the respective manual reset buttons. When the Steam Line Pressure-Low steam line isolation signal is enabled, the main steam isolation on Steam Line Pressure-Negative Rate-High is disabled.This Function must be OPERABLE in MODES 1, 2, and 3 to allow an orderly cooldown and depressurization of the unit without the actuation of SI or main steam isolation.
This Function does not have to be OPERABLE in MODE 4, 5, or 6 because system pressure must already be below the P-1 1 setpoint for the requirements of the heatup and cooldown curves to be met.c. Engqineered Safety Feature Actuation System Interlocks-Tva_-Low' Low, P-12 On increasing reactor coolant temperature, the P-12 interlock provides an arming signal to the Steam Dump System. On a decreasing temperature, the P-12 interlock removes the arming signal to the Steam Dump System to prevent an excessive cooldown of the RCS due to a malfunctioning Steam Dump System.Since Tavg is used as an indication of bulk RCS temperature, this Function meets redundancy requirements with one OPERABLE channel' in each loop. These channels are used in two-out-of-four logic.This Function must be OPERABLE in MODES 1, 2,. and 3 when a secondary
'side break or stuck open valve could result in the rapid depressurization of the steam lines., This Function does not have to be OPERABLE in MODE 4, 5, or 6 because there is insufficient energy in the secondary side of the unit to have an accident.McGuire Unit 1 and 2 B 3.3.2-26 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES APPLICABLE SAFETY ANALYSES, LCO, and APPLICABILITY (continued)
.9. Containment Pressure Control System Permissives The Containment Pressure Control System (CPCS) protects the Containment Building from excessive depressurization by preventing inadvertent actuation or continuous operation of the Containment Spray and Containment Air Return Systems when containment pressure is at or less than the CPCS permissive setpoint.
The control scheme of CPCS is comprised of eight independent control circuits (4 per train), each having a separate and independent pressure transmitter and current alarm module. Each pressure transmitter monitors the containment pressure and provides input to its respective current alarm. The current alarms are set to inhibit or terminate containment spray and containment air return fan operation when containment pressure falls below the setpoint.The alarm modules switch back to the permissive state (allowing the systems to operate) when containment pressure is greater than or equal to the setpoint.This function must be OPERABLE in MODES 1, 2, 3, and 4 when there is sufficient energy in the primary and secondary sides to pressurize containment following a pipe break. In MODES 5 and 6, there is insufficient energy in the primary and secondary sides to significantly pressurize the containment.
The ESFAS instrumentation satisfies Criterion 3 of 10 CFR 50.36 (Ref. 6).ACTIONS A Note has been added in the ACTIONS to clarify the application of Completion Time rules. The Conditions of this Specification may be entered independently for each Function listed on Table 3.3.2-1. When the Required Channels in Table 3.3.2-1 are specified (e.g., on a per steam line, per loop, per SG, etc., basis), then the Condition may be entered separately for each steam line, loop, SG, etc., as appropriate.
A channel shall be OPERABLE if the point at which the channel trips is found equal to or more conservative than the Allowable Value. In the event a channel's trip setpoint is found less conservative than the Allowable Value, or the transmitter, instrument loop, signal processing electronics, or bistable is found inoperable, then all affected Functions provided by the channel must be declared inoperable and the LCO Condition(s) entered for the protection Function(s) affected.
If plant conditions warrant, the trip setpoint may be set outside the NOMINAL TRIP SETPOINT calibration tolerance band as long as the trip setpoint is conservative with respect to the NOMINAL TRIP SETPOINT.If the trip setpoint is found outside the NOMINAL TRIP SETPINT calibration tolerance band and non-conservative with respect to the NOMINAL TRIP SETPOINT, the setpoint shall be re-adjusted.
McGuire Unit 1 and 2 B 3.3.2-27 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
When the number of inoperable channels in a trip function exceed those specified in one or other related Conditions associated with a trip function, then the unit is outside the safety analysis.
Therefore, LCO 3.0.3 should be immediately entered if applicable in the current MODE of operation.
A..1 Condition A applies to all ESFAS protection functions.
Condition A addresses the situation where one or more channels or trains for one or more Functions are inoperable at the same time. The Required Action is to refer to Table 3.3.2-1 and to take the Required Actions for the protection functions affected.
The Completion Times are those from the referenced Conditions and Required Actions.B.1, B.2.1 and B.2.2 Condition B applies to manual initiation of:* SI;Phase A Isolation; and Phase B Isolation.
This action addresses the train orientation of the SSPS for the functions listed above. If a channel or train is inoperable, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is allowed to return it to an OPERABLE status. Note that for containment spray and Phase B isolation, failure of one or both channels in one train renders the train inoperable.
Condition B, therefore, encompasses both situations.
The specified Completion Time is reasonable considering that there are two automatic actuation trains and another manual initiation train OPERABLE for each Function, and the low probability of an event occurring during this interval.
If the train cannot be restored to OPERABLE status, the unit must be placed in a MODE in which the LCO does not apply. This is done by placing the unit in at least MODE 3 within an additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (54 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br /> total time) and in MODE 5 within an additional 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> (84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br /> total time). The allowable Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.McGuire Unit 1 and 2 B 3.3.2-28 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
C.1, C.2.1 and C.2.2 Condition C applies to the automatic actuation logic and actuation relays for the following functions:
SI;Phase A Isolation; and Phase B Isolation.
This action addresses the train orientation of the SSPS and the master and slave relays. If one train is inoperable, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> are allowed to restore the train to OPERABLE status. The 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed for restoring the inoperable train to OPERABLE status is justified in Reference
- 10. The specified Completion Time is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval.
If the train cannot be restored to OPERABLE status, the unit must be placed in a MODE in which the LCO does not apply. This is done by placing the unit in at least MODE 3 within an additional 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> total time) and in MODE 5 within an additional 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> (60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br /> total time). The Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.The Required Actions are modified by a Note that allows one train to be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing, provided the other train is OPERABLE.
The Required Actions are not required to be met during this time, unless the train is discovered inoperable during the testing. This allowance is based on the reliability analysis assumption of WCAP-1 0271-P-A (Ref. 7) that 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> is the average time required to perform train surveillance.
If an individual SSPS slave relay or slave relay contact is incapable of actuating, then the equipment operated by the slave relay or slave relay contact is inoperable.
An SSPS train is not inoperable due to an individual SSPS slave relay or slave relay contact being incapable of actuating.
D.1, D.2.1, and D.2.2 Condition D applies to:* Containment Pressure-High;
- Pressurizer Pressure-Low Low;* Steam Line Pressure-Low; McGuire Unit 1 and 2 B 3.3.2-29 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
- Steam Line Pressure-Negative Rate-High; SG Water Level -High High (P-14) for the Feedwater Isolation Function.SG Water level-Low Low, and Loss of offsite power.If one channel is inoperable, 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> are allowed to restore the channel to OPERABLE status or to place it in the tripped condition.
Generally this Condition applies to functions that operate on two-out-of-three logic.Therefore, failure of one channel places the Function in a two-out-of-two configuration.
One channel must be tripped to place the Function in a one-out-of-two configuration that satisfies redundancy requirements.
The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to restore the channel to OPERABLE status or placed in the tripped condition is justified in Reference 10.Failure to restore the inoperable channel to OPERABLE status or place it in the tripped condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> requires the unit be placed in MODE 3 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems. In MODE 4, these Functions are no longer required OPERABLE.The Required Actions are modified by a Note that allows the inoperable channel to be bypassed for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for surveillance testing of other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowed for testing, are justified in Reference 10.E.1, E.2.1, and E.2.2 Condition E applies to:* Containment Phase B Isolation Containment Pressure -High-High, and* Steam Line Isolation Containment Pressure -High High.McGuire Unit 1 and 2 B 3.3.2-30 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
Neither of these signals has input to a control function.
Thus, two-out-of-three logic is necessary to meet acceptable protective requirements.
However, a two-out-of-three design would require tripping a failed channel. This is undesirable because a single failure would then cause spurious isolation initiation.
Therefore, these channels are designed with two-out-of-four logic so that a failed channel may be bypassed rather than tripped. Note that one channel may be bypassed and still satisfy the single failure criterion.
Furthermore, with one channel bypassed, a single instrumentation channel failure will not spuriously initiate isolation.
To avoid the inadvertent actuation of Phase B containment isolation, the inoperable channel should not be placed in the tripped condition.
Instead it is bypassed.
Restoring the channel to OPERABLE status, or placing the inoperable channel in the bypass condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, is sufficient to assure that the Function remains OPERABLE and minimizes the time that the Function may be in a partial trip condition (assuming the inoperable channel has failed high). The Completion Time is further justified based on the low probability of an event occurring during this interval.
Failure to restore the inoperable channel to OPERABLE status, or place it in the bypassed condition within72 hours, requires the unit be placed in MODE 3 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems. In MODE 4, these Functions are no longer required OPERABLE.The Required Actions are modified by a Note that allows one additional channel to be bypassed for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for surveillance testing. Placing a second channel in the bypass condition for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing purposes is acceptable based on the results of Reference 10.F.1, F.2.1, and F.2.2 Condition F applies to:* Manual Initiation of Steam Line Isolation; and* P-4 Interlock.
McGuire Unit 1 and 2 B 3.3.2-31 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
For the Manual Initiation and the P-4 Interlock Functions, this action addresses the train orientation of the SSPS. If a train or channel is inoperable, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is allowed to return it to OPERABLE status. The specified Completion Time is reasonable considering the nature of these Functions, the available redundancy, and the low probability of an'event occurring during this interval.
If the Function cannot be returned to OPERABLE status, the unit must be placed in MODE 3 within the' next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power in an orderly manner and withoutchallenging unit systems. In MODE 4, the unit does not have any analyzed transients or conditions that require the explicit use of the protection functions noted above.G.1 and G.2 Condition G applies to manual initiation of Steam Line Isolation.
This action addresses the operability of the manual steam line isolation function for each individual main steam isolation valve. If a channel is inoperable, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is allowed to return it to an OPERABLE status. If the train cannot be restored to OPERABLE status, the Conditions and Required Actions of LCO 3.7.2, "Main Steam Isolation Valves," must be entered for the associated inoperable valve. The specified Completion Time is reasonable considering that there is a system level manual initiation train for this Function and the low probability of an event occurring during this interval.H.1, H.2.1 and H.2.2 Condition H applies to the automatic actuation logic and actuation relays for the Steam Line Isolation, Feedwater Isolation, and AFW actuation Functions.
The action addresses the train orientation of the SSPS and the master and slave relays for these functions.
If one train is inoperable, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> are allowed to restore the train to OPERABLE status. The 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed for restoring the inoperable train to OPERABLE status is justified in Reference
- 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval.
If the train cannot be returned to OPERABLE status, the unit must be brought to MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The allowed Completion Times are reasonable,'
based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.McGuire Unit 1 and 2 B 3.3.2-32 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
Placing the unit in MODE 4 removes all requirements for OPERABILITY of the protection channels and actuation functions.
In this MODE, the unit does not have analyzed transients or conditions that require the explicit use of the protection functions noted above.The Required Actions are modified by a Note that allows one train to be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing provided the other train is OPERABLE.
This allowance is based on the reliability analysis (Ref. 7)assumption that 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> is the average time required to perform channel surveillance.
If an individual SSPS slave relay or slave relay contact is incapable of actuating, then the equipment operated by the slave relay or slave relay contact is inoperable.
An SSPS train is not inoperable due to an individual SSPS slave relay or slave relay contact being incapable of actuating.
1.1 and 1.2 Condition I applies to the automatic actuation logic and actuation relays for the Turbine Trip Function.This action addresses the train orientation of the SSPS and the master and slave relays for this Function.
If one train is inoperable, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> are allowed to restore the train to OPERABLE status or the unit must be placed in MODE 3 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed for restoring the inoperable train to OPERABLE status is justified in Reference
- 10. The Completion Time for restoring a train to OPERABLE status is reasonable considering that there is another train OPERABLE, and the low probability of an event occurring during this interval.
The allowed Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit systems. These Functions are no longer required in MODE 3. Placing the unit in MODE 3 removes all requirements for OPERABILITY of the protection channels and actuation functions.
In this MODE, the unit does not have analyzed transients or conditions that require the explicit use of the protection functions noted above.The Required Actions are modified by a Note that allows one train to be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing provided the other train is OPERABLE.
This allowance is based on the reliability analysis (Ref. 7)assumption that 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> is the average time required to perform channel surveillance.
If an individual SSPS slave relay or slave relay contact is incapable of actuating, then the equipment operated by the slave relay or slave relay McGuire Unit 1 and 2 B 3.3.2-33 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued) contact is inoperable.
An SSPS train is not inoperable due to an individual SSPS slave relay or slave relay contact being incapable of actuating.
J.1 and J.2 Condition J applies to:* SG Water Level-High High (P-14) for the Turbine Trip Function; and* Tavg-Low.If one channel is inoperable, 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> are allowed to restore one channel to OPERABLE status or to place it in the tripped condition.
If placed in the tripped condition, the Function is then in a partial trip condition where one-out-of-two logic will result in actuation.
The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to restore the channel to OPERABLE status or to place it in the tripped condition is justified in Reference 10. Failure to restore the inoperable channel to OPERABLE status or place it in the tripped condition within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />'requires the unit to be placed in MODE 3 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The allowed Completion Time of 78 hours9.027778e-4 days <br />0.0217 hours <br />1.289683e-4 weeks <br />2.9679e-5 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit systems. In MODE 3, these Functions are no longer required OPERABLE.The Required Actions are modified by a Note that allows the inoperable channel to be bypassed for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for surveillance testing of other channels.
The note also allows an OPERABLE channel to be placed in bypass for up to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> for testing of the bypassed channel. However, only one channel may be placed in bypass at any one time. The 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed to place the inoperable channel in the tripped condition, and the 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowed for a channel to be in the bypassed condition for testing, are justified in Reference 10.K.1 and K.2 Condition K applies to the AFW pump start on trip of all MFW pumps.This action addresses the relay contact orientation for the auto start function of the AFW System on loss of all MFW pumps. The OPERABILITY of the AFW System must be assured by allowing automatic start of the AFW System pumps. If a channel is inoperable, 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> is allowed to place the channel in trip. If placed in the tripped condition, the function is then in a partial trip condition where a one-out-of-one logic will result in actuation.
If the channel is not placed in trip within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> are McGuire Unit 1 and 2 B 3.3.2-34 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued) allowed to place the unit in MODE 3. The allowed Completion Time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> is reasonable, based on operating experience, to reach MODE 3 from full power conditions in an orderly manner and without challenging unit systems. In MODE 3, the unit does not have any analyzed transients or conditions that require the explicit use of the protection function noted above.L.1I Condition L applies to the Doghouse Water Level -High High.The failure of one required channel in one train in either reactor building doghouse results in a loss of redundancy for the function.
The function can still be initiated by the remaining operable train. The inoperable train is, required to be restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or continuous visual monitoring of the doghouse water level must be implemented in the following hour.The allowed Completion Time is reasonable considering that the redundant train remains OPERABLE to initiate the function if required.M.1, M.2.1 and M.2.2 Condition M applies to the Doghouse Water Level -High High.The failure of two trains in either reactor building doghouse results in a loss of the function.
Continuous visual monitoring of the doghouse water level must be implemented in the following hour.The allowed Completion Time provides sufficient time for the operating staff to establish the required monitoring..
N.1 and N.2 Condition N applies to the Auxiliary Feedwater Pumps Suction Transfer on Suction Pressure Low.If one or more channels on a single AFW pump is inoperable, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is allowed to restore the channel(s) to OPERABLE status or to declare the associated AFW pump inoperable.
The failure of one or more channels on one pump disables the ability for the suction transfer on that pump.The allowed Completion Times are reasonable, considering the remaining redundant pumps and transfer instrumentation.
McGuire Unit 1 and 2 B 3.3.2-35 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued)
Condition ,O applies to the Auxiliary Feedwater Pumps Suction Transfer on Suction Pressure Low.If one or more channels on more than one AFW pumps are inoperable, the ability for the suction transfer has been lost on multiple pumps. In this case, the associated AFW pumps must be declared inoperable immediately.
P.1 and P.2 Condition P applies to RWST Level-Low Coincident with Safety Injection.
RWST Level-Low Coincident with SI provides actuation of switchover to the containment sump. The inoperable channel shall be returned to OPERABLE status or placed in the trip condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. This Condition applies to a function that operates on two-out-or-three logic. Therefore, failure of one channel places the Function in a two-out-or-two configuration.
The channel must be tripped to place the Function in a one-out-of-two configuration that satisfies redundancy requirements.
A channel placed in the trip condition shall be restored to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. With one channel in the trip condition, a single failure of another channel coincident with a design basis Loss of Coolant Accident (LOCA) could result in premature automatic swapover of ECCS pumps to the containment recirculation sump. For a failure leading to early swapover, plant analyses assume operators do not have.sufficient time to resolve the problem prior to ECCS pump damage.Consequently, as a result of this premature swapover, both trains of ECCS pumps could fail due to insufficient sump water level. This could prevent the ECCS pumps from performing their post-LOCA cooling function.
The allowed Completion Time of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is reasonable since, based on operating experience, there is a very small probability of a random failure of another RWST level channel in a given 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period.Q.1, Q.2.1 and Q.2.2 Condition Q applies to the P-1 I and P-1 2 interlocks.
With one channel inoperable, the operator must Verify that the interlock is in the required state for the existing unit condition.
The verification is performed by visual observation of the permissive status light in the unit control room. This action manually accomplishes the function of the interlock.
Determination must be made within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Completion Time is equal to the time allowed by LCO 3.0.3 to initiate shutdown.
actions in the event of a complete McGuire Unit 1 and 2 B 3.3.2-36 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES ACTIONS (continued) loss of ESFAS function.
If the interlock is not in the required state (or placed in the required state) for the existing unit condition, the unit must be placed in MODE 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems. Placing the unit in MODE 4 removes all requirements for OPERABILITY of these interlocks.
R. 1 Condition R applies to the Containment Pressure Control System Start and Terminate Permissives.
With one or more channels inoperable, the affected containment spray, containment air return fans, and hydrogen skimmer fans must be declared inoperable immediately.
The supported system LCOs provide the appropriate Required Actions and Completion Times for the equipment made inoperable by the inoperable channel. The immediate Completion Time is appropriate since the inoperable channel could prevent the supported equipment from starting when required.
Additionally, protection from an inadvertent actuation may not be provided if the terminate function is not OPERABLE.S.1 and S.2 Condition S applies to RWST Level-Low Coincident with Safety Injection.
When Required Actions cannot be completed within their Completion Time, the unit must be brought to a MODE or Condition in which the LCO requirements are not applicable.
To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of entering the Condition.
The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems. In MODE 4, the unit does not have any analyzed transients of conditions that require the explicit use of the protection functions noted above.SURVEILLANCE The SRs for each ESFAS Function are identified by the SRs column of REQUIREMENTS Table 3.3.2-1.A Note has been added to the SR Table to clarify that Table 3.3.2-1 determines which SRs apply to which ESFAS Functions.
Note that each channel of process protection supplies both trains of the ESFAS. When testing channel I, train A and train B must be examined.McGuire Unit 1 and 2 B 3.3.2-37 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued)
Similarly, train A and train B must be examined when testing channel II, channel Ill, and channel IV (if applicable).
The CHANNEL CALIBRATION and COTs are performed in a manner that is consistent with the assumptions used in analytically calculating the required channel accuracies.
SR 3.3.2.1 Performance of the CHANNEL CHECK ensures that a gross failure of instrumentation has not occurred.
A CHANNEL CHECK is normally a comparison of the parameter indicated on one channel to a similar parameter on other channels.
It is based'on the assumption that instrument channels monitoring the same parameter should read approximately the same value. Significant deviations between instrument channels could be an indication of excessive instrument drift in one of the channels or of something even more serious. A CHANNEL CHECK will detect gross channel failure;thus, it is key to verifying the instrumentation continues to operate properly between each CHANNEL CALIBRATION.
Agreement criteria are determined by the unit staff, based on a combination of the channel instrument uncertainties, including indication and reliabilityý'.
If a channel is outside the criteria, it may be an indication that the sensor or the signal processing equipment has drifted outside its limit.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SIR 3.3.2.2 SR 3.3.2.2 is the performance of an ACTUATION LOGIC TEST using the semiautomatic tester. The train being tested is placed in the bypass condition, thus preventing inadvertent actuation.
Through the semiautomatic tester, all possible logic combinations, with and without applicable permissives, are tested for each protection function.
In addition, the master relay coil is pulse tested for continuity.
This verifies that the logic modules are OPERABLE and that there is an intact voltage signal path to the master relay coils. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.2.3 SR 3.3.2.3 is the performance of a COT on the RWST level and Containment'Pressure Control Start and Terminate Permissives.
McGuire Unit 1 and 2 SB 3.3.2-38 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued)
A COT is performed on each required channel to ensure the entire channel will perform the intended Function.
Setpoints must be found conservative with respect to the Allowable Values specified in Table 3.3. 2-1. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions," has been implemented; this SR is modified by two (2)Notes as identified in Table 3.3.2-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value. Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology.
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. For channels determined to be OPERABLE but degraded, after returning the channel to service the performance of these channels will be evaluated under the plant Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition.
The second Note requires that the as-left setting for the channel be returned to within the as-left tolerance of the Nominal Trip Setpoint (NTSP). Where a setpoint more conservative than the NTSP is used in the plant surveillance procedures (field setting), the as-left and as-found tolerances, as applicable, will be applied to the surveillance procedure setpoint.
This will ensure that sufficient margin to the Safety Limit and/or Analytical Limit is maintained.
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, then the channel shall be declared inoperable.
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR.SR 3.3.2.4 SR 3.3.2.4 is the performance of a MASTER RELAY TEST. The MASTER RELAY TEST is the energizing of the master relay, verifying contact operation and a low voltage continuity check of the slave relay coil. Upon master relay contact operation, a low voltage is injected to the slave relay coil. This voltage is insufficient to pick up the slave relay, but large enough to demonstrate signal path continuity.
The time allowed for the testing (4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />) is justified in Reference
- 7. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Unit 1 and 2 B 3.3.2-39 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCEREQUIREMENTS (continued)
SR 3.3.2.5 SR 3.3.2.5 is the performance of a COT.A COT is performed on each required channel to ensure the channel will perform the intended Function.
The tested portion of the loop must trip within the Allowable Values specified in Table 3.3. 2-1.The setpoint shall be left set consistent with the assumptions of the setpoint methodology.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.2.6 SR 3.3.2.6 is the performance of a SLAVE RELAY TEST. The SLAVE RELAY TEST is the energizing of the slave relays. Contact operation is verified in one of two ways. Actuation equipment that may be operated in the design mitigation MODE is either allowed to function, or is placed in a condition where the relay contact operation can be verified without operation of the equipment.
Actuation equipment that may not be operated in the design mitigation MODE is prevented from operation by the SLAVE RELAY TEST circuit. For this latter case, contact operation is verified by a continuity check of the circuit containing the slave relay. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.2.7 SR 3.3.2.7 is the performance of a TADOT. This test is a check of the Manual Actuation Functions, AFW pump start, Reactor Trip (P-4) Interlock and Doghouse Water Level -High High feedwater isolation.
Each Manual Actuation Function is tested up to, and including, the master relay coils. In some instances, the test includes actuation of the end device (i.e., pump starts, valve cycles, etc.). The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program. The SR is modified by a Note thatexcludes verification of setpoints during the TADOT for manual initiation Functions.
The manual initiation Functions have no associated setpoints.
McGuire Unit 1 and 2 B 3.3.2-40 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.3.2.8 SR 3.3.2.8 is the performance of a CHANNEL CALIBRATION.
The CHANNEL CALIBRATION may be performed at power or during refueling based on bypass testing capability.
Channel unavailability evaluations in References 10 and 11 have conservatively assumed that the CHANNEL CALIBRATION is performed at power with the channel in bypass.CHANNEL CALIBRATION is a complete check of the instrument loop, including the sensor. The test verifies that the channel responds to measured parameter within the necessary range and accuracy.CHANNEL CALIBRATIONS must be performed consistent with the assumptions of the unit specific setpoint methodology.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.This SR is modified by a Note stating that this test should include verification that the time constants are adjusted to the prescribed values where applicable.
The applicable time constants are shown in Table 3.3.2-1.For Functions for which TSTF-493, "Clarify Application of Setpoint Methodology for LSSS Functions," has been implemented; this SR is modified by two (2)Notes as identified in Table 3.3.2-1. The first Note requires evaluation of channel performance for the condition where the as-found setting for the channel setpoint is outside its as-found tolerance but conservative with respect to the Allowable Value. Evaluation of channel performance will verify that the channel will continue to behave in accordance with safety analysis assumptions and the channel performance assumptions in the setpoint methodology.
The purpose of the assessment is to ensure confidence in the channel performance prior to returning the channel to service. For channels determined to be OPERABLE but degraded, after returning the channel to service the performance of these channels will be evaluated under the plant Corrective Action Program. Entry into the Corrective Action Program will ensure required review and documentation of the condition.
The second Note requires that the as-left setting for the channel be returned to within the as-left tolerance of the Nominal Trip Setpoint (NTSP). Where a setpoint more conservative than the NTSP is used in the plant surveillance procedures (field setting), the as-left and as-found tolerances, as applicable, will be applied to the surveillance procedure setpoint.
This will ensure that sufficient margin to the Safety Limit and/or Analytical Limit is maintained.
If the as-left channel setting cannot be returned to a setting within the as-left tolerance of the NTSP, McGuire Unit 1 and 2 B 3.3.2-41 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued) then the channel shall be declared inoperable.
The second Note also requires that the methodologies for calculating the as-left and the as-found tolerances be in the UFSAR.SR 3.3.2.9 This SR ensures the individual channel ESF RESPONSE TIMES are less than or equal to the maximum values assumed in the accident analysis.
Response Time testing acceptance criteria are included in the UFSAR (Ref. 2). Individual component response times are not modeled in the analyses.
The analyses model the overall or total elapsed time, from the point at which the parameter exceeds the Trip Setpoint value at the sensor, to the point at which the equipment in both trains reaches the required functional state (e.g., pumps at rated discharge pressure, valves in full open or closed position).
For channels that include dynamic transfer functions (e.g., lag, lead/lag, rate/lag, etc.), the response time test may be performed with the transfer functions set to one with the resulting measured response time compared to the appropriate UFSAR response time. Alternately, the response time test can be performed with the time constants set to their nominal value provided the required response time is analytically calculated assuming the time constants are set at their nominal values. The response time may be measured by a series of overlapping tests such that the entire response time is measured.Response time may be verified by actual response time tests in any series of sequential, overlapping or total channel measurements, or by the summation of allocated sensor, signal processing and actuation logic response times with actual response time tests on the remainder of the channel. Allocations for sensor response times may be obtained from: (1) historical records based on acceptable response time tests (hydraulic, noise, or power interrupt tests), (2)in place, onsite, or offsite (e.g., vendor) test measurements, or (3) utilizing vendor engineering specifications.
WCAP-13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" provides the basis and methodology for using allocated sensor response times in the overall verification of the channel response time for specific sensors identified in the WCAP. Response time verification for other sensor types must be either demonstrated by test or their equivalency to those listed in WCAP-13632-P-A, Revision 2. Any demonstration of equivalency must have been determined to be acceptable by NRC staff review.WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests' provides the basis and methodology for using allocated signal processing and actuation logic response times in the overall verification McGuire Unit 1 and 2 B 3.3.2-42 Revision No. 122 ESFAS Instrumentation B 3.3.2 BASES SURVEILLANCE REQUIREMENTS (continued) of the protection system channel response time. The allocations for sensor, signal conditioning, and actuation logic response times must be verified prior to placing the component in operational service and re-verified following maintenance that may adversely affect response time. In general, electrical repair work does not impact response time provided the parts used for repair are of the same type and value. Specific components identified in the WCAP may be replaced without verification testing. One example where response time could be affected is replacing the sensing assembly of a transmitter.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.This SR is modified by a Note that clarifies that the turbine driven AFW pump is tested within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after reaching 900 psig in the SGs.REFERENCES
- 1. UFSAR, Chapter 6.2. UFSAR, Chapter 7.3. UFSAR, Chapter 15.4. IEEE-279-1971.
- 5. 10 CFR 50.49.6. 10 CFR 50.36, Technical Specifications, (c)(2)(ii).
- 7. WCAP-10271-P-A, Supplement 1 and Supplement 2, Rev. 1, May 1986 and June 1990.8. WCAP 13632-P-A, Revision 2, "Elimination of Pressure Sensor Response Time Testing Requirements" Sep., 1995.9. WCAP-14036-P-A, Revision 1, "Elimination of Periodic Protection Channel Response Time Tests" Oct., 1998.10. WCAP-14333-P-A, Revision 1, October 1998.11. WCAP-15376-P-A, Revision 1, March 2003.McGuire Unit 1 and 2 B 3.3.2-43 Revision No. 122 PAM Instrumentation B 3.3.3 B 3.3 INSTRUMENTATION B 3.3.3 Post Accident Monitoring (PAM) Instrumentation BASES BACKGROUND The primary purpose of the PAM instrumentation is to display unit variables that provide information required by the control room operators during accident situations.
This information provides the necessary support for the operator to take the manual actions for which no automatic control is provided and that are required for safety systems to accomplish their safety functions for Design Basis Accidents (DBAs).The OPERABILITY of the accident monitoring instrumentation ensures that there is sufficient information available on selected unit parameters to monitor and to assess unit status and behavior following an accident.The availability of accident monitoring instrumentation is important so that responses to corrective actions can be observed and the need for, and magnitude of, further actions can be determined.
These essential instruments are identified by unit specific documents (Ref. 1) addressing the recommendations of Regulatory Guide 1.97 (Ref. 2) as required by Supplement 1 to NUREG-0737 (Ref. 3).The instrument channels required to be OPERABLE by this LCO include two classes of parameters identified during unit specific implementation of Regulatory Guide 1.97 as Type A and Category I variables.
Type A variables are included in this LCO because they provide the primary information required for the control room operator to take specific manually controlled actions for which no automatic control is provided, and that are required for safety systems to accomplish their safety functions for DBAs.Category I variables are the key variables deemed risk significant because they are needed to: Determine whether other systems important to safety are performing their intended functions; Provide information to the operators that will enable them to determine the likelihood of a gross breach of the barriers to radioactivity release; and McGuire Unit 1 and 2 B 3.3.3-1 Revision No. 122 PAM Instrumentation B 3.3.3 BASES BACKGROUND (continued)
Provide information regarding the release of radioactive materials to allow for early indication of the need to initiate action necessary to protect the public, and to estimate the magnitude of any impending threat.These key variables are identified by the unit specific Regulatory Guide 1.97 analyses (Ref. 1). These analyses identify the unit specific Type A and Category I variables and provide justification for deviating from the NRC proposed list of Category I variables.
The specific instrument Functions listed in Table 3.3.3-1 are discussed in the LCO section.APPLICABLE The PAM instrumentation ensures the operability of Regulatory Guide SAFETY ANALYSES 1.97 Type A and Category I variables so that the control room operating staff can: Perform the diagnosis specified in the emergency operating procedures (these variables are restricted to preplanned actions for the primary success path of DBAs), e.g., loss of coolant accident (LOCA);Take the specified, pre-planned, manually controlled actions, for which no automatic control is provided, and that are required for safety systems to accomplish their safety function;Determine whether systems important to safety are performing their intended functions; Determine the likelihood of a gross breach of the barriers to radioactivity release;Determine if a gross breach of a barrier has occurred; and Initiate action necessary to protect the public and to estimate the magnitude of any impending threat.PAM instrumentation that meets the definition of Type A in Regulatory Guide 1.97 satisfies Criterion 3 of 10 CFR 50.36 (Ref. 4). Category I, non-Type A, instrumentation must be retained in TS because it is intended to assist operators in minimizing the consequences of accidents.
Therefore, Category I, non-Type A, variables are important for reducing public risk.McGuire Unit I and 2 B 3.3.3-2 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO The PAM instrumentation LCO provides OPERABILITY requirements for Regulatory Guide 1.97 Type A monitors, which provide information required by the control room operators to perform certain manual actions specified in the unit Emergency Operating Procedures.
These manual actions ensure that a system can accomplish its safety function, and are credited in the safety analyses.
Additionally, this LCO addresses Regulatory Guide 1.97 instruments that have been designated Category I, non-Type A.The OPERABILITY of the PAM instrumentation ensures there is sufficient information available on selected unit parameters to monitor and assess unit status following an accident.
This capability is consistent with the recommendations of Reference 1.LCO 3.3.3 requires two OPERABLE channels for most Functions.
Two OPERABLE channels ensure no single failure prevents operators from getting the information necessary for them to determine the safety status of the unit, and to bring the unit to and maintain it in a safe condition following an accident.Furthermore, OPERABILITY of two channels allows a CHANNEL CHECK during the post accident phase to confirm the validity of displayed information.
In some cases, the total number of channels exceeds the number of required channels, e.g., pressurizer level has a total of three channels, however only two channels are required OPERABLE.
This provides additional redundancy beyond that required by this LCO, i.e., when one channel of pressurizer level is inoperable, the required number of two channels can still be met. The ACTIONS of this LCO are only entered when the required number of channels cannot be met.Category I variables are required to meet Regulatory Guide 1.97 Category I (Ref. 2) design and qualification requirements for seismic and environmental qualification, single failure criterion, utilization of emergency standby power, immediately accessible display, continuous readout, and recording of display.Listed below are discussions of the specified instrument Functions listed in Table 3.3.3-1.1. Neutron Flux -(Wide Range)Wide Range Neutron Flux indication is provided to verify reactor shutdown.McGuire Unit 1 and 2 B 3.3.3-3 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
Neutron flux is used for accident diagnosis, verification of subcriticality, and diagnosis of positive reactivity insertion.
Two channels of wide range neutron flux are required OPERABLE.2, 3. Reactor Coolant System (RCS) Hot and Cold Leg Temperatures RCS Hot and Cold Leg Temperatures are Category I variables provided for verification of core cooling and long term surveillance.
RCS hot and cold leg temperatures are used to determine RCS subcooling margin. RCS subcooling margin will allow termination of safety injection (SI), if still in progress, or reinitiation of SI if it has been stopped. RCS subcooling margin is also used for unit stabilization and cooldown control.In addition, RCS cold leg temperature is used in conjunction with RCS hot leg temperature to verify the unit conditions necessary to establish natural circulation in the RCS.Reactor coolant hot and cold leg temperature inputs are provided by fast response resistance elements and associated transmitters in each loop.Two channels of RCS Hot Leg Temperature and two channels of RCS Cold Leg Temperature are required OPERABLE by the LCO.RCS Hot Leg and Cold Leg Temperature are diverse indications of RCS temperature.
Core exit thermocouples also provide diverse indication of RCS temperature.
- 4. Reactor Coolant System Pressure (Wide Range)RCS wide range pressure is a Category I variable provided for verification of core cooling and RCS integrity long term surveillance.
RCS pressure is used to verify delivery of SI flow to RCS from at least one train when the RCS pressure is below the pump shutoff head. RCS pressure is also used to verify closure of manually closed spray line valves and pressurizer power operated relief valves (PORVs).McGuire Unit 1 and 2 B 3.3.3-4 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
In addition to these verifications, RCS pressure is used for determining RCS subcooling margin. RCS pressure can also be used:* to determine whether to terminate actuated SI or to reinitiate stopped SI;to determine when to reset SI and shut off low head SI;* to manually restart low head SI;* as reactor coolant pump (RCP) trip criteria; and* to make a determination on the nature of the accident in progress and where to go next in the procedure.
RCS pressure is also related to three decisions about depressurization.
They are: to determine whether to proceed with primary system depressurization; to verify termination of depressurization; and to determine whether to close accumulator isolation valves during a controlled cooldown/depressurization.
A final use of RCS pressure is to determine whether to operate the pressurizer heaters.RCS pressure is a Type A variable because the operator uses this indication to monitor the cooldown of the RCS following a steam generator tube rupture (SGTR) or small break LOCA. Operator actions to maintain a controlled cooldown, such as adjusting steam generator (SG) pressure or level, would use this indication.
Furthermore, RCS pressure is one factor that may be used in decisions to terminate RCP operation.
Two channels of wide range RCS pressure are required OPERABLE.McGuire Unit 1 and 2 B 3.3.3-5 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued) 5, 6. Reactor Vessel Water Level Reactor Vessel Water Level is provided for verification and long term surveillance of core cooling. It is also used for accident diagnosis and to determine reactor coolant inventory adequacy.The Reactor Vessel Water Level Monitoring System provides a direct measurement of the collapsed liquid level above the fuel alignment plate. The collapsed level represents the amount of liquid mass that is in the reactor vessel above the core.Measurement of the collapsed water level is selected because it is a direct indication of the water inventory.
Two channels of Reactor Vessel Water Level are provided in both the core region (lower range) and the head region (wide range) with indication in the unit control room. Each channel uses differential pressure transmitters and a microprocessor to calculate true vessel level or relative void content of the primary coolant.7. Containment Sump Water Level (Wide Range)Containment Sump Water Level is provided for verification and long term surveillance of RCS integrity.
Containment Sump Water Level is used to determine:
- containment sump level accident diagnosis; and* when to continue the recirculation procedure.
Two channels of wide range level are required OPERABLE.
Each channel consists of wide range level indication and two level switches.8. Containment Pressure (Wide Range)Containment Pressure (Wide Range) is provided for verification of RCS and containment OPERABILITY.
Containment pressure is used to verify closure of main steam isolation valves (MSIVs), containment spray operation, and Phase B containment isolation when Containment Pressure -High High is reached.McGuire Unit 1 and 2 B 3.3.3-6 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
Two channels of wide range containment pressure are required OPERABLE.9. Containment Atmosphere Radiation (High Range)Containment Atmosphere Radiation is provided to monitor for the potential of significant radiation releases and to provide release assessment for use by operators in determining the need to invoke site emergency plans. Containment radiation level is used to determine if a high energy line break (HELB) has occurred, and whether the event is inside or outside of containment.
Two channels of high range containment atmosphere radiation are provided.
One channel is required OPERABLE.
Diversity is provided by portable instrumentation or by sampling and analysis.10. Not Used 11. Pressurizer Level Pressurizer Level is used to determine whether to terminate SI, if still in progress, or to reinitiate SI if it has been stopped.Knowledge of pressurizer water level is also used to verify the unit conditions necessary to establish natural circulation in the RCS and to verify that the unit is maintained in a safe shutdown condition.
Three channels of pressurizer level are provided.
Two channels are required OPERABLE.12. Steam Generator Water Level (Narrow Range)SG Water Level is provided to monitor operation of decay heat removal via the SGs. The Category I indication of SG level is the narrow range level instrumentation.
McGuire Unit 1 and 2 B 3.3.3-7 Revision No. 122 PAM Instrumentation B 3.3.3.'BASES LCO (continued)
SG Water Level (Narrow Range) is used to: identify the faulted SG following a tube rupture;verify that the intact SGs are an adequate heat sink for the reactor;determine the nature of the accident in progress (e.g., verify an SGTR); and verify unit conditions for termination of Sl during secondary unit HELBs outside containment.
Four channels per SG of narrow range water level are provided.Only two channels are required.OPERABLE by the LCO.13, 14,15, 16. Core Exit Temperature Core Exit Temperature is provided for verification and long term surveillance of core cooling.Adequate core cooling is ensured with two valid Core Exit Temperature channels per quadrant with two CETs per required channel. Core inlet temperature data is used with core exit temperature to give radial distribution of coolant enthalpy rise across the core. Core Exit Temperature is used to determine whether to terminate SI, if still in progress, or to reinitiate SI if it has been stopped. Core Exit Temperature is also used for unit stabilization and cooldown control.Two OPERABLE channels of Core Exit Temperature are required in each quadrant to provide indication of radial distribution of the coolant temperature rise across representative regions of the core.Two sets of two thermocouples (1 set from each redundant power train) ensure a single failure will not disable the ability to determine the radial temperature gradient.17. Auxiliary Feedwater Flow AFW Flow is provided to monitor operation of decay heat removal via the SGs.McGuire Unit 1 and 2 B 3.3.3-8 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
The AFW Flow to each SG is determined by flow indicators, pump operational status indicators, and NSWS and condensate supply valve indicators in the control room. The AFW flow indicators are category 2, type D variables which are used to demonstrate the category 1 variable of AFW assured source.AFW flow is used three ways:* to verify delivery of AFW flow to the SGs;* to determine whether to terminate SI if still in progress, in conjunction with SG water level (narrow range); and* to regulate AFW flow so that the SG tubes remain covered.18. RCS Subcooling Marqin Monitor RCS subcooling is provided to allow unit stabilization and cooldown control. RCS subcooling will allow termination of SI, if still in progress, or reinitiation of SI if it has been stopped.The margin to saturation is calculated from RCS pressure and temperature measurements.
Display of the RCS subcooling margin values is provided via the Inadequate Core Cooling Monitor Subcooling Margin Monitor (ICCM SMM) and the Plant Computer.The plant computer is the primary indication for RCS subcooling margin. Backup indication of the RCS subcooling margin consists of two qualified redundant channels each consisting of one ICCM plasma display and one ICCM cabinet, with each ICCM cabinet receiving inputs from 20 core exit thermocouples, one wide range RCS pressure transmitter, and two wide range hot leg RTDs all associated with that channel (train) of ICCM SMM. Therefore, a single train of ICCM SMM including the associated RCS subcooling margin field inputs is equivalent to a single channel of the "RCS Subcooling Margin Monitor" technical specifications function.Each train of ICCM SMM uses the average of the five highest core exit thermocouples and the wide range RCS pressure for that train to determine primary system conditions.
The primary system conditions are then compared to saturation curves to calculate and display the margin to subcooling.
Each train of ICCM SMM also calculates subcooling values for each of the two wide range hot leg temperature RTDs associated with that train.McGuire Unit 1 and 2 B 3.3.3-9 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
Therefore, a single train (channel) of SMM provides three diverse subcooling margin values. The diversity of temperature inputs for a channel (train) of the RCS Subcooling Margin Monitor function minimizes the impact to this function resulting from the failure of a single field input.A graphic display on the ICCM over the required range gives the operator a representation of primary system conditions compared to various curved of importance (saturation, etc.).Note: Each train's RCS Subcooling Margin values are displayed on the respective train's ICCM SMM display and the Plant Computer.In addition to displaying the subcooling values received from the ICCM SMM, the plant computer performs independent RCS Subcooling Margin calculations using the average of the five highest core exit thermocouples and wide range RCS pressure to determine primary system conditions.
The plant computer compares the primary system conditions to plant computer saturation curves to calculate and display the core margin to subcooling.
The plant computer also calculates and displays subcooling values based on the wide range hot leg and cold leg temperature RTDs.A graphic display on the plant computer over the required range gives the operator a representation of primary system conditions compared to various curves of importance (saturation, NDT, etc.).A backup program exists to ensure the capability to accurately monitor RCS subcooling.
The program includes training and a procedure to manually calculate subcooling margin, using control room pressure and temperature instruments.
- 19. Steam Line Pressure Steam Line Pressure is provided to monitor operation of decay heat removal via the SGs. Steam line pressure is also used to determine if a high energy secondary line rupture occurred and which SG is faulted.Two channels of Steam Line Pressure are required OPERABLE.McGuire Unit 1 and 2 B 3.3.3-10 Revision No. 122 PAM Instrumentation B 3.3.3 BASES LCO (continued)
- 20. Refueling Water Storage Tank Level RWST level monitoring is provided to ensure an adequate supply of water to the ECCS pumps during the switchover to cold leg recirculation.
Three channels of RWST level are provided.
Two channels are required OPERABLE by the LCO.21. DG Heat Exchanger NSWS Flow Flow indicators are provided in each of the NSWS trains to indicate cooling water flow through the respective train DG. These indicators are provided for operators to manually control flow to the DG heat exchanger.
One flow indicator is required OPERABLE on each train.22. Containment Spray Heat Exchanger NSWS Flow Flow indicators are provided in each of the NSWS trains to indicate cooling water flow through the respective train containment spray heat exchangers.
These indicators are provided for operators to manually control flow to the heat exchanger.
One flow indicator is required OPERABLE on each train.APPLICABILITY The PAM instrumentation LCO is applicable in MODES 1, 2, and 3.These variables are related to the diagnosis and pre-planned actions required to mitigate DBAs. The applicable DBAs are assumed to occur in MODES 1, 2, and 3. In MODES 4, 5, and 6, unit conditions are such that the likelihood of an event that would require PAM instrumentation is low;therefore, the PAM instrumentation is not required to be OPERABLE in these MODES.ACTIONS A Note has been added in the ACTIONS to clarify the application of Completion Time rules. The Conditions of this Specification may be entered independently for each Function listed on Table 3.3.3-1. When the Required Channels in Table 3.3.3-1 are specified (e.g., on a per steam line, per loop, per SG, etc., basis), then the Condition may be entered separately for each steam line, loop, SG, etc., as appropriate.
The Completion Time(s) of the inoperable channel(s) of a Function will be ACTIONS (continued)
McGuire Unit 1 and 2 B 3.3.3-11 Revision No. 122 PAM Instrumentation B 3.3.3 BASES tracked separately for each Function starting from the time the Condition was entered for that Function.A.1 Condition A applies to all PAM instrument Functions.
Condition A addresses the situation when one or more required channels for one or more Functions are inoperable.
The Required Action is to refer to Table 3.3.3-1 and take the appropriate Required Actions for the PAM instrumentation affected.
The Completion Times are those from the referenced Conditions and Required Actions.B. 1 Condition B applies when one or more Functions have one required channel that is inoperable.
Required Action B.1 requires restoring the inoperable channel to OPERABLE status within 30 days. The 30 day Completion Time is based on operating experience and takes into account the remaining OPERABLE channel, the passive nature of the instrument (no critical automatic action is assumed to occur from these instruments), and the low probability of an event requiring PAM instrumentation during this interval.
Condition B is not applicable to functions with a single required channel.C.1 Condition C applies when the Required Action and associated Completion Time for Condition B are not met. This Required Action specifies initiation of actions in Specification 5.6.7, which requires a written report to be submitted to the NRC immediately.
This report discusses the results of the root cause evaluation of the inoperability and identifies proposed restorative actions. This action is appropriate in lieu of a shutdown requirement since alternative actions are identified before loss of functional capability, and given the likelihood of unit conditions that would require information provided by this instrumentation.
McGuire Unit 1 and 2 B 3.3.3-12 Revision No. 122 PAM Instrumentation B 3.3.3 BASES ACTIONS (continued)
D.1 Condition D applies when a single require channel is inoperable.
Required Action D.1 requires restoring the required channel to OPERABLE status within 7 days. The Completion Time of 7 days is based on the relatively low probability of an event requiring PAM instrument operation and the availability of alternate means to obtain the required information.
Continuous operation with the required channel inoperable is not acceptable.
Therefore, requiring restoration of the required channel to OPERABLE status limits the risk that the PAM function will be in a degraded condition should an event occur.E.1 Condition E applies when one or more Functions have two inoperable required channels (i.e., two channels inoperable in the same Function).
Required Action E.1 requires restoring one channel in the Function(s) to OPERABLE status within 7 days. The Completion Time of 7 days is based on the relatively low probability of an event requiring PAM instrument operation and the availability of alternate means to obtain the required information.
Continuous operation with two required channels inoperable in a Function is not acceptable because the alternate indications may not fully meet all performance qualification requirements applied to the PAM instrumentation.
Therefore, requiring restoration of one inoperable channel of the Function limits the risk that the PAM Function will be in a degraded condition should an accident occur.Condition E does not apply to hydrogen monitor channels and functions with single channels.F. 1 Not Used G.1 and G.2 If the Required Action and associated Completion Time of Conditions D or E are not met, the unit must be brought to a MODE where the requirements of this LCO do not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 4 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.McGuire Unit 1 and 2 B 3.3.3-13 Revision No. 122 PAM Instrumentation B 3.3.3 BASES ACTIONS (continued)
H.1 Alternate means of monitoring Containment Area Radiation have been developed and tested. These alternate means may be temporarily installed if the normal PAM channel cannot be restored to OPERABLE status within the allotted time. If these alternate means are used, the Required Action is not to shut down the unit but rather to follow the directions of Specification 5.6.7, in the Administrative Controls section of the TS. The report provided to the NRC should discuss the alternate means used, describe the degree to which the alternate means are equivalent to the installed PAM channels, justify the areas in which they are not equivalent, 'and provide a schedule for restoring the normal PAM channels.SURVEILLANCE A Note has been added to the SR Table to clarify that REQUIREMENTS SR 3.3.3.1 and SR 3.3.3.3 apply to each PAM instrumentation Function in Table 3.3.3-1.Performing the Neutron Flux Instrumentation and Containment Atmosphere Radiation (High-Range) surveillances meets the License Renewal Commitments for License Renewal Program for High-Range Radiation and Neutron Flux Instrumentation Circuits per UFSAR Chapter 18, Table 18-1 and License Renewal Commitments Specification MCS-1274.00-00-0016, Section 4.44.SR 3.3.3.1 Performance of the CHANNEL CHECK ensures that a gross instrumentation failure has not occurred.
A CHANNEL CHECK is normally a comparison of the parameter indicated on one channel to a similar parameter on other channels.
It is based on the assumption that instrument channels monitoring the same parameter should read approximately the same value. Significant deviations between the two instrument channels could be an indication of excessive instrument drift in one of the channels or of something even more serious. A CHANNEL CHECK will detect gross channel failure; thus, it is key to verifying the instrumentation continues to operate properly between each CHANNEL CALIBRATION.
The high radiation instrumentation should be compared to similar unit instruments located throughout the unit.McGuire Unit'1 and 2 B 3.3.3-14 Revision No. 122 PAM Instrumentation B 3.3.3 BASES SURVEILLANCE REQUIREMENTS (continued)
Agreement criteria are determined by the unit staff, based on a combination of the channel instrument uncertainties, including isolation, indication, and readability.
If a channel is outside the criteria, it may be an indication that the sensor or the signal processing equipment has drifted outside its limit. If the channels are within the criteria, it is an indication that the channels are OPERABLE.As specified in the SR, a CHANNEL CHECK is only required for those channels that are normally energized.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.3.3.2 Not Used SR 3.3.3.3 CHANNEL CALIBRATION is a complete check of the instrument loop, including the sensor. The test verifies that the channel responds to measured parameter with the necessary range and accuracy.
This SR is modified by a Note that excludes neutron detectors.
The calibration method for neutron detectors is specified in the Bases of LCO 3.3.1,"Reactor Trip System (RTS) Instrumentation." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES
- 1. UFSAR Section 1.8.2. Regulatory Guide 1.97, Rev. 2.3. NUREG-0737, Supplement 1, "TMI Action Items." 4. 10 CFR 50.36, Technical Specifications, (c)(2)(ii).
McGuire Unit 1 and 2 B 3.3.3-15 Revision No. 122 RWST B 3.5.4 B 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)B 3.5.4 Refueling Water Storage Tank (RWST)BASES BACKGROUND The RWST supplies borated water to the Chemical and Volume Control System (CVCS) during abnormal operating conditions, to the refueling pool during refueling and makeup operations, and to the ECCS during accident conditions.
The RWST supplies both trains of the-ECCS' through separate supply de,- during the onjection f phase -loss of coolant accident (LOCA)recovery.
A motor operated, isolation valve is provided in each header to isolate the RWST once the system has. been transferred to the recirculation mode. The recirculation mode is entered when pump suction is transferred to the containment sump following receipt of the RWST-.Low Level signal. Use of a single RWST to supply both trains of the ECCS is acceptable since the RWST is a passive component, and since injection phase passive failures are not required to be assumed to occur- coincidentally with Design Basis Events.The switchover from normal operation to the injection phase of ECCS operation requires changing centrifugal charging pump; suctionfrom the CVCS volume control tank (VCT) to the RWST through the use of isolation valves.During normal operation in MODES 1, 2, and 3,the safety injection (SI)and residual heat removal.(RHR) pumps are aligned to take suction from the RWST.The ECCS pumps are provided with recirculation lines that ensure each pump can maintain minimum flow requirements when operating at or near shutoff head conditions.
When the suction for the'ECCS pumps is transferred to the containment sump, the RWST flow paths must be isolated to prevent a release of the containment sump contents to the RWST, which could result in a release of contaminants to the atmosphere and the eventual loss of suction head for the ECCS pumps.This LCO ensures that: a. The RWST contains sufficient borated water to support the ECCS during the injection
'phase;McGuire Unit 1 and 2 B 3.5.4-1 Revision No. 122 RWST B 3.5.4 BASES BACKGROUND (continued)
- b. Sufficient water volume exists in the containment sump to support continued operation of the ECCS and Containment Spray System pumps at the time of transfer to the recirculation mode of cooling;and c. The reactor remains subcritical following a LOCA.Insufficient water in the RWST could result in insufficient cooling capacity when the transfer to the recirculation mode occurs. Improper boron concentrations could result in a reduction of SDM or excessive boric acid precipitation in the core following the LOCA, as well as excessive caustic stress corrosion of mechanical components and systems inside the containment.
APPLICABLE SAFETY ANALYSES During accident conditions, the RWST provides a source of borated water to the ECCS pumps. As such, it provides core cooling and replacement inventory and is a source of negative reactivity for reactor shutdown (Ref. 1). The design basis transients and applicable safety analyses concerning each of these systems are discussed in the Applicable Safety Analyses section of B 3.5.2, "ECCS-Operating";
B 3.5.3, "ECCS-Shutdown".
These analyses are used to assess changes to the RWST in order to evaluate their effects in relation to the acceptance limits in the analyses.The RWST must also meet volume, boron concentration, and temperature requirements for non-LOCA events. The volume is not an explicit assumption in non-LOCA events since the required volume is a small fraction of the available volume. The deliverable volume limit is set by the LOCA and containment analyses.
For the RWST, the deliverable volume is different from the total volume contained due to the location of the piping connection.
The ECCS water boron concentration is an explicit assumption in the main steam line break (MSLB) analysis to ensure the required shutdown capability.
This assumption is important in ensuring the required shutdown capability.
Although the maximum temperature is a conservative assumption in the feedwater line break analysis, SI termination occurs very quickly in this analysis and long before significant RCS heatup occurs. The minimum temperature is an assumption in the MSLB actuation analyses.For a large break LOCA analysis, the RWST level setpoint equivalent to the minimum water volume limit of 383,146 gallons and the lower boron concentration limits listed in the COLR are used to compute the post McGuire Unit 1 and 2 B 3.5.4-2 Revision No. 122 RWST B 3.5.4 BASES APPLICABLE SAFETY ANALYSES (continued)
LOCA sump boron concentration necessary to assure subcriticality, with all rods in (crediting control rod assembly insertion), minus the highest worth rod out (ARI N-i). The large cold leg break LOCA is the limiting case since boron accumulation in the core will be maximized during, the cold leg recirculation phase due to core boiling. The accumulation of boron in the core prevents the boron from returning to the sump, which leads to a boron diluted sump Condition.
A reduction in the RWST minimum boron concentration would produce a subsequent reduction in the available containment sump concentration for post LOCA shutdown, potentially causing the core-to become re-critical by injecting boron diluted sump water into the core when switching over to hot leg recirculation.
The RWST minimum boron concentration is also used in the post-LOCA subcriticality verification during the injection phase. For each reload cycle, the all rods out (ARO, no credit for control rod assembly insertion) critical boron concentration is verified to be less than the minimum allowed RWST boron concentration.
No credit is taken for control rod assembly insertion when verifying subcriticality during the injection phase, but credit is taken for control rod assembly insertion in the post-LOCA subcriticality calculation during the sump recirculation phase to offset the boron diluted sump condition described above.The upper limit on boron concentration as listed in the COLR is used to determine the maximum allowable time to switch to hot leg recirculation following a LOCA. The purpose of switching from cold leg to hot leg injection is to avoid boron precipitation in the core following the accident.i The RWST temperature limits were originally established with containment spray aligned to the RWST and were not revised when the Containment Spray System became a manually actuated system with the initial suction source changed to the Containment Sump., The RWST temperature limits are contained within additional analyses and remain valid, although the basis is historical and no longer relevant.
The following paragraph is retained for historical purposes only.In the ECCS analysis, the containment spray temperature is assumed to be equal to the RWST lower temperature limit of 70 0 F. If the lower temperature limit was violated, the containment spray could further reduce containment pressure, which decreases the saturated steam specific volume.. This means that each pound of steam generated during core reflood tends to occupy a larger volume, which decreases the rate at which steam can be vented out the break and increases peak clad temperature.
The upper temperature limit of l100 0 F, plus an allowance for temperature measurement uncertainty, is used in the containment McGuire Unit 1 and 2 B 3.5.4-3 Revision No. 122 RWST B 3.5.4 BASES APPLICABLE SAFETY ANALYSES (continued)
OPERABILITY analysis.
Exceeding this temperature will result in higher containment pressures due to reduced containment spray cooling capacity.
For the containment response following an MSLB, the lower limit on boron concentration and the upper limit on RWST water temperature are used to maximize the total energy release to containment.
The RWST satisfies Criterion 3 of 10 CFR 50.36 (Ref. 2).LCO The RWST ensures that an adequate supply of borated water is available to cool and cover the core in the event of a LOCA, to maintain the reactor subcritical following a DBA, and to ensure adequate level in the containment sump to support ECCS and Containment Spray System pump operation in the recirculation mode.To be considered OPERABLE, the RWST must meet the water volume, boron concentration, and temperature limits established in the SRs.APPLICABILITY In MODES 1, 2, 3, and 4, RWST OPERABILITY requirements are dictated by ECCS OPERABILITY requirements.
Since both the ECCS must be OPERABLE in MODES 1, 2, 3, and 4, the RWST must also be OPERABLE to support their operation.
Core cooling requirements in MODE 5 are addressed by LCO 3.4.7, "RCS Loops-MODE 5, Loops Filled," and LCO 3.4.8, "RCS Loops-MODE 5, Loops Not Filled." MODE 6 core cooling requirements are addressed by LCO 3.9.5,"Residual Heat Removal (RHR) and Coolant Circulation-High Water Level," and LCO 3.9.6, "Residual Heat Removal (RHR) and Coolant Circulation-Low Water Level." ACTIONS A.1 With RWST boron concentration or borated water temperature not within limits, they must be returned to within limits within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. Under these conditions neither the ECCS nor the Containment Spray System can perform its design function.
Therefore, prompt action must be taken to restore the tank to OPERABLE condition.
The 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> limit to restore the RWST temperature or boron concentration to within limits was developed considering the time required to change either the boron concentration or temperature and the fact that the contents of the tank are still available for injection.
B. 1 With the RWST inoperable for reasons other than Condition A (e.g., water volume), it must be restored to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.7 McGuire Unit 1 and 2 B 3.5.4-4 Revision No. 122 RWST B 3.5.4 BASES ACTIONS (continued)
In this Condition, the ECCS cannot perform its design function.Therefore, prompt action must be taken to restore the tank to OPERABLE status or to place the plant in a MODE in which the RWST is not required.The short time limit of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> to restore the RWST to OPERABLE status is based on this condition simultaneously affecting redundant trains.C.1 and C.2 If the RWST cannot be returned to OPERABLE status within the associated Completion Time, the plant must be birought to a MODE in which the LCO does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.SURVEILLANCE SR 3.5.4.1 REQUIREMENTS The RWST borated water temperature should be verified to be within the limits assumed in the accident analyses band. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.5.4.2 The RWST water volume should be verified to be above the required minimum level plus instrument uncertainty in order to ensure that a sufficient initial supply is available for injection and to support continued ECCS and Containment Spray System pump operation on recirculation.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.5.4.3 The boron concentration of the RWST should be verified to be within the required limits. This SR ensures that the reactor will remain subcritical following a LOCA and that the boron content assumed for the injection water in the MSLB analysis is available.
Further, it assures that the resulting sump pH will be maintained in an acceptable range so that boron precipitation in the core will not, occur and the effect of chloride and caustic stress corrosion on mechanical systems and components will be minimized.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.McGuire Unit 1 and 2 B IB 3.5.4-5 Revision No. 122 RWST B 3.5.4 BASES REFERENCES 1.2.UFSAR, Chapter 6 and Chapter 15.10 CFR 50.36, Technical Specifications, (c)(2)(ii).
McGuire Unit 1 and 2 B 3.5.4-6 Revision No. 122 Containment Spray System B 3.6.6 B 3.6 CONTAINMENT SYSTEMS B 3.6.6 Containment Spray System BASES BACKGROUND The Containment Spray System provides containment atmosphere cooling to limit post accident pressure and temperature in containment to less than the design values. Reduction of containment pressure and the iodine removal capability of the spray reduce the release of fission product radioactivity from containment to the environment, in the event of a Design Basis Accident (DBA). The Containment Spray System is designed to meet the requirements of 10 CFR 50, Appendix A, GDC 38, "Containment Heat Removal," GDC 39, "Inspection of Containment Heat Removal Systems," GDC 40, "Testing of Containment Heat Removal Systems," GDC 41,"Containment Atmosphere Cleanup," GDC 42, "Inspection of Containment Atmosphere Cleanup Systems," and GDC 43, "Testing of Containment Atmosphere Cleanup Systems" (Ref. 1).The Containment Spray System consists of two separate trains of equal capacity, each capable of meeting the system design basis spray coverage.Each train includes a containment spray pump, one containment spray heat exchanger, spray headers, nozzles, valves, and piping. Each train is powered from a separate Engineered Safety Feature (ESF) bus. One train of Containment Spray flow is manually initiated with suction on the Containment Sump after commencement of the ECCS sump recirculation mode of operation.
The diversion of a portion of the recirculation flow from each train of the Residual Heat Removal (RHR) System to additional redundant spray headers completes the Containment Spray System heat removal capability.
Each RHR train is capable of supplying spray coverage, if desired, to supplement the Containment Spray System.The Containment Spray System provides a spray of cold or subcooled borated water into the upper containment volume to limit the containment pressure and temperature during a DBA. In the recirculation mode of operation, heat is removed from the containment sump water by the Containment Spray System and RHR heat exchangers.
Each train of the Containment Spray System provides adequate spray coverage to meet the system design requirements for containment heat removal.McGuire Unit 1 and 2 B 3.6.6-1 Revision No. 122 Containment Spray System-B 3.6.6 BASES BACKGROUND (continued)
For the hypothetical double-ended rupture of a Reactor Coolant System pipe, the pH of the sump solution (and, consequently, the spray solution) is raised to approximately
7.9 within
one hour of the onset of the LOCA. The resultant pH of the sump solution is based on the mixing of the RCS fluids, ECCS injection fluid, and the melted ice which are combined in the sump.The alkaline pH of the containment sump water minimizes-the evolution of iodine and the occurrence of chloride and caustic stress corrosion on mechanical systems and components exposed to the fluid.Containment Spray is manually initiated from the Control Room by opening the Containment Spray System (CSS) Pump discharge valves and starting the CSS Pump. The CSS is typically not activated until an RWST Low-Low level alarm is received.
This alarm signals the operator to manually align the ECCS to the recirculation mode and manually initiate containment spray. The CSS maintains an equilibrium temperature between the containment atmosphere and the recirculated sump water. Operation of the CSS in the recirculation mode is controlled by the operator in accordance with emergency operation procedures.
The RHR spray operation is initiated manually, when required by the emergency operating procedures, after the Emergency Core Cooling System (ECCS) is operating in the recirculation mode. The RHR sprays are available to supplement the Containment Spray System, if desired, in limiting containment pressure.
This additional spray capacity would typically be used after the ice bed has been depleted and in the event that containment pressure rises above a predetermined limit. The Containment Spray System is an ESF system. It is designed to ensure that the heat removal capability required during the post accident period can be attained.The operation of the Containment Spray System, together with the ice condenser, is adequate to assure pressure suppression subsequent to the initial blowdown of steam and water from a DBA. During the post blowdown period, the Air Return System (ARS) is automatically started.The ARS returns upper compartment air through the divider barrier to the lower compartment.
This serves to equalize pressures in containment and to continue circulating heated air and steam through the ice condenser, where heat is removed by the remaining ice.McGuire Unit 1 and 2 B 3.6.6-2 Revision No. 122 Containment Spray System B 3.6.6 BASES BACKGROUND (continued)
The Containment Spray System limits thetemperature and pressure that could be expected following a DBA. Protection of containment integrity limits leakage of fission product radioactivity from containment to the environment.
APPLICABLE The limiting DBAs considered relative to containment OPERABILITY SAFETY ANALYSES are the loss of coolant accident (LOCA)'and the steam line break (SLB).The DBA LOCA and SLB are analyzed using computer codes designed to predict the resultant containment pressure and temperature transients.
No two DBAs are assumed to occur simultaneously or consecutively.
The postulated DBAs are analyzed, in regard to containment ESF systems, assuming the loss of one ESF bus, which is the worst case single active failure, resulting in one train of the Containment Spray System, the RHR System, and the ARS being rendered inoperable (Ref. 2).The DBA analyses show that the maximum peak containment pressure results from the LOCA analysis, and is calculated to be less than the containment design pressure.
The maximum peak containment atmosphere temperature results from the SLB analysis and was calculated to be within the containment environmental qualification temperature during the DBA SLB. The basis of the containment environmental qualification temperature is to ensure the OPERABILITY of safety related equipment inside containment (Ref. 3).The Containment Spray System actuation modeled in the containment analysis is based on the time associated with reaching the RWST Low Level Setpoint and operator action prior to achieving full flow through -the containment spray nozzles. A delayed response time initiation provides conservative analyses of peak calculated containment temperature and pressure responses.
The Containment Spray System total response time is composed of operator action, system startup time, and time for the piping to fill.For certain aspects of transient accident analyses, maximizing the, calculated containment pressure is not conservative.
In particular, the ECCS cooling effectiveness during the core reflood phase of a LOCA analysis increases with increasing containmentbackpressure.
For these calculations, the containment backpressure is calculated in a manner designed to conservatively minimize, rather than maximize, the calculated transient containment pressures in accordance with 10 CFR 50, Appendix K (Ref. 4).McGuire Unit 1 and 2 B 3.6.6ý3 Revisionr No. 122 Containment Spray System B 3.6.6 BASES APPLICABLE SAFETY ANALYSES (continued)
Inadvertent actuation" is precluded by design features consisting of an additional set of containment pressure sensors which prevents operation when the containment pressure is below the containment pressure control system permissive.
The Containment Spray System satisfies Criterion 3 of 10 CFR 50.36 (Ref.5).LCO During a DBA, one train of Containment Spray System is required to provide the heat removal capability assumed in the safety analyses.
To ensure that this requirement is met, two containment spray trains must be OPERABLE with power from two safety related, independent power .supplies.
Therefore, in the event of an accident, at least one train operates.Each Containment Spray System includes a spray pump, headers, valves, heatexchangers, nozzles, piping, instruments, and controls to ensure an OPERABLE flow path capable of being manually initiated to take suction from the Containment Sump and delivering it to the Containment Spray Rings.APPLICABILITY In MODES 1, 2, 3, and 4, a DBA could cause a release of radioactive material to-containment and an increase in containment pressure and temperature requiring the operation of the Containment Spray System.In MODES 5 and 6, the probability-and consequences of these events are reduced because of the pressure and temperature limitations of these MODES. Thus, the Containment Spray System is not required.
to be OPERABLE in MODE 5 or 6.'ACTIONS 'A. 1 With one containment spray train inoperable, the affected train must be restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The components in this degraded condition are capable of providing 100% of the heat removal after an accident.
The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time was developed taking into account the' redundant heat removal and iodine removal capabilities afforded by the OPERABLE train and the low probability of a DBA occurring during this period.McGuire Unit 1 and 2 B B 3.6.6-4 Revision No. 122 Containment Spray System B 3.6.6 BASES ACTIONS (continued)
B.1 and B.2 If the affected containment spray train cannot be restored to OPERABLE status within the required Completion Time, the plant must be brought to a MODE in which the LCO does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 84 hours9.722222e-4 days <br />0.0233 hours <br />1.388889e-4 weeks <br />3.1962e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.The extended interval to reach MODE 5 allows additional time and is reasonable when considering that the driving force for a release of radioactive material from the Reactor Coolant System is reduced in MODE 3.SURVEILLANCE SR 3.6.6.1 REQUIREMENTS Verifying the correct alignment of manual and power operated valves, excluding check valves, in the Containment Spray System provides assurance that the proper flow path exists for Containment Spray System operation.
This SR does not apply to valves that are locked, sealed, or otherwise secured in position since they were verified in the correct position prior to being secured. This SR does not require any testing or valve manipulation.
Rather, it involves verification, through a system walkdown or computer status indication, that those valves outside containment and capable of potentially being mispositioned, are in the correct position.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.The surveillance includes verifying the correct alignment of the containment spray pump discharge valves.SR 3.6.6.2 Verifying that each containment spray pump's developed head at the flow test point is greater than or equal to the required developed head ensures that spray pump performance has not degraded during the cycle. Flow and differential head are normal tests of centrifugal pump performance required by the ASME OM Code (Ref. 6). Since the containment spray pumps cannot be tested with flow through the spray headers, they are tested on bypass flow. This test confirms one point on the pump design curve and is indicative of overall performance.
Such inservice inspections confirm component OPERABILITY, trend performance, and detect incipient failures by indicating abnormal performance.
The Frequency of this SR is in accordance with the Inservice Testing Program.McGuire Unit 1 and 2 B 3.6.6-5 Revision No. 122 Containment Spray System B 3.6.6 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.6.6.3 and SR 3.6.6.4 Not Used.SR 3.6.6.5 and SR 3.6.6.6 These SRs require verification that each containment spray pump discharge valve can be manually opened or is prevented from opening and each containment spray pump can be manually started or is de-energized and prevented from starting upon receipt of Containment Pressure Control System start and terminate signals. The EDG Load Sequencer must be reset in order for the containment spray pump to start. The CPCS is described in the Bases for.LCO 3.3.2, "ESFAS." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.6.7 With the containment spray inlet valves closed and~the spray header drained of any solution, low pressure air or smoke can be blown through test connections.
The spray nozzles can also be tested using a vacuum blower to induce air flow through each nozzle to verify unobstructed flow.This SR requires verification that each spray nozzle is unobstructed following activities that could cause nozzle blockage.
Normal plant operation and activities are not expected to initiate this SR. However, activities such as inadvertent spray actuation that causes fluid flow through the nozzles, major configuration change, or a loss of foreign material control when working within the respective system boundary, may require surveillance performance.
McGuire Unit 1 and 2, B 3.6.6-6 Revision No.. 122 Containment Spray System B 3.6.6 BASES*REFERENCES
- 1. 10 CFR 50, Appendix A, GDC 38, GDC 39, GDC 40, GDC 41, GDC 42, and GDC 43.2. UFSAR, Section 6.2.3. 10 CFR 50.49.4. 10 CFR 50, Appendix K.5. 10 CFR 50.36, Technical Specifications, (c)(2)(ii).
- 6. ASME Code for Operation and Maintenance of Nuclear Power Plants.McGuire Unit 1 and 2 B 3.6.6-7 Revision No. 122 ARS B 3.6.11 B 3.6 CONTAINMENT SYSTEMS B 3.6.11 Air Return System (ARS)BASES BACKGROUND The ARS is designed to assure the rapid return of air from the upper to the lower containment compartment after the initial blowdown following a Design Basis Accident (DBA). The return of this air to the lower compartment and subsequent recirculation back up through the ice condenser assists in cooling the containment atmosphere and limiting post accident pressure and temperature in containment to less than design values. Limiting pressure and temperature reduces the release of fission product radioactivity from containment to the environment in the event of a DBA. The ARS also promotes hydrogen dilution by mixing the hydrogen with containment atmosphere and distributing throughout the containment.
The ARS consists of two separate trains of equal capacity, each capable of meeting the design bases. Each train includes a 100% capacity air return fan and associated motor operated damper in the fan discharge line to the containment lower compartment.
The damper acts as a barrier between the upper and lower compartments to prevent reverse flow which would bypass the ice condenser.
The damper is normally closed and remains closed throughout the initial blowdown following a postulated high energy, line break. The damper motor is actuated several seconds after the containment pressure high-high setpoint is reached and a start permissive from the Containment Pressure Control System is present. A backdraft damper is also provided at the discharge of each fan to serve as a check damper on the non-operating train. Each train is powered from a separate Engineered Safety Features (ESF) bus.The ARS fans are automatically started by the containment pressure high-high signal 9 +/- 1 minutes after the containment pressure reaches the pressure setpoint and a start permissive from the Containment Pressure Control System is present. Initially during a design basis accident LOCA or HELB, natural circulation forces steam and air flow from lower containment through the ice condenser to upper containment.
Hydrogen accumulation is not a major concern, and adequate mixing of the containment atmosphere occurs. Therefore, the ARS fans are not required until approximately 10 minutes after the design basis accident.The fan start time delay allows the upper and lower containment pressure to equalize and reduce the differential pressure.McGuire Unit 1 and 2 B 3.6.11 -1 Revision No. 122 ARS B 3.6.11.BASES BACKGROUND (continued)
After starting, the fans displace air from the upper compartment to the lower compartment, thereby returning the air that was displaced by the high energy line break blowdown from the lower compartment and equalizing pressures throughout containment.
After discharge into the lower compartment, air flows with steam produced by residual heat through the ice condenser doors into the ice condenser compartment where the steam portion of the flow is condensed.
The air flow returns to the upper compartment through the top deck doors in the upper portion of the ice condenser compartment.
The ARS fans operate continuously after actuation, circulating air through the containment volume. When the containment pressure falls below a predetermined value, the ARS fans are automatically de-energized.
Thereafter, the fans are automatically cycled on and off if necessary to control any additional containment pressure transients.
The ARS also functions, after all the ice has melted, to circulate any steam still entering the lower compartment to the upper compartment where the Containment Spray System can cool it.The ARS is an ESF system. it is designed to ensure that the heat removal capability required during the post accident period can be attained.
The operation of the ARS, in conjunction with the ice bed, the Containment Spray System, and the Residual Heat Removal (RHR)System spray, provides the required heat removal capability to limit post accident conditions to less than the containment design values.In response to NRC Bulletin 2003-01, "Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized Water Reactors," McGuire has the option of starting one air return fan at a containment pressure of I psig during certain small break LOCA (SBLOCA) transient events.APPLICABLE SAFETY ANALYSES The limiting DBAs considered relative to containment temperature and and pressure are the loss of coolant accident (LOCA) and the steam line break (SLB). The LOCA and SLB are analyzed using computer codes designed to predict the resultant containment pressure and temperature transients.
DBAs are assumed not to occur simultaneously or consecutively.
The postulated DBAs are analyzed, in regard to ESF systems, assuming the loss of one ESF bus, which is the worst case single active failure and results in one train each of the Containment Spray System, RHR System, and ARS being inoperable (Ref. 1). The DBA analyses show that the maximum peak containment pressure results from the LOCA analysis and is calculated to be less than the containment design pressure.McGuire Unit 1 and 2 B 3.6.11-2 Revision No. 122 ,
ARS B 3.6.11 BASES APPLICABLE SAFETY ANALYSES (continued)
For certain aspects of transient accident analyses, maximizing the calculated containment pressure is not conservative.
In particular, the cooling effectiveness of the Emergency Core Cooling System during the core reflood phase of a LOCA analysis increases with increasing containment backpressure.
For these calculations, the containment backpressure is calculated in a manner designed to conservatively minimize, rather than maximize, the calculated transient.
containment pressures, in accordance with 10 CFR 50, Appendix K (Ref. 2).The analysis for minimum internal containment pressure (i.e., maximum external differential containment pressure) assumes inadvertent simultaneous actuation of both the ARS and the Containment Spray System.The modeled ARS actuation from the containment analysis is based upon a response time associated with exceeding the containment pressure High-High signal setpoint to achieving full ARS air flow. A delayed response time initiation provides conservative analyses of peak calculated containment temperature and pressure responses.
The ARS total response time of 600 seconds includes signal delays.The ARS satisfies Criterion 3 of 10 CFR 50.36 (Ref. 3).LCO In the event of a DBA, one train of the ARS is required to provide the minimum air recirculation for heat removal assumed in the safety analyses.
To ensure this requirement is met, two trains of the ARS must be OPERABLE.
This will ensure that at least one train will operate, assuming the worst case single failure occurs, which is in the ESF power supply.APPLICABILITY In MODES 1, 2, 3, and 4, a DBA could cause an increase in containment pressure and temperature requiring the operation of the ARS. Therefore, the'LCO is applicable in MODES 1, 2, 3, and 4.In MODES 5 and 6, the probability and consequences of these events are reduced due to the pressure and temperature limitations of these MODES. Therefore, the ARS is not required to be OPERABLE in these MODES.McGuire Unit 1 and 2 B 3.6. 1.1 =3 Revision No. 12 2 ARS B 3.6.11 BASES ACTIONS A. 1 If one of the required trains of the ARS is inoperable, it must be restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time was developed taking into account the redundant flow of the OPERABLE ARS train and the low probability of a DBA occurring in this period.B.1 and B.2 If the ARS train cannot be restored to OPERABLE status within the required Completion Time, the plant must be brought to a MODE in which the LCO does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.SURVEILLANCE SR 3.6.11.1 REQUIREMENTS Verifying that each ARS fan starts on an actual or simulated actuation signal, after a delay > 8.0 minutes and < 10.0 minutes, and operates for> 15 minutes is sufficient to ensure that all fans are OPERABLE and that all associated controls and time delays are functioning properly.
It also ensures that blockage, fan and/or motor failure, or excessive vibration can be detected for corrective action. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.2 Verifying ARS fan motor current to be at rated speed with the return air dampers closed confirms one operating condition of the fan. This test is indicative of overall fan motor performance.
Such inservice tests confirm component OPERABILITY, trend performance, and detect incipient failures by indicating abnormal performance.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.3 Verifying the OPERABILITY of the return air damper provides assurance that the proper flow path will exist when the fan is started. This surveillance also tests the circuitry, including time delays, to ensure the system operates properly.
The Surveillance Frequency is based on McGuire Unit 1 and 2 B 3.6.11-4 Revision No. 122 ARS B 3.6.11 BASES SURVEILLANCE REQUIREMENTS (continued) operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.4 and SR 3.6.11.5 Verifying the OPERABILITY of the check damper in the air return fan discharge line to the containment lower compartment provides assurance that the proper flow path will exist when the fan is started and that reverse flow can not occur when the fan is not operating.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.6.11.6 and SR 3.6.11.7 These SRs require verification that each ARS motor operated damper opens or is prevented from opening and each ARS fan is allowed to start or is prevented from starting upon receipt of Containment Pressure Control System start permissive and terminate signals. The CPCS is described in the Bases for LCO 3.3.2, "ESFAS." The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.REFERENCES
- 1. UFSAR, Section 6.2.2. 10 CFR 50, Appendix K.3. 10 CFR 50.36, Technical Specifications, (c)(2)(ii).
McGuire Unit 1 and 2 B 3.6.11-5 Revision No. 122 Diesel Fuel Oil and Starting Air B 3.8.3 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.3 Diesel Fuel Oil and Starting Air BASES BACKGROUND Each diesel generator (DG) is provided with a storage tank having a fuel oil capacity sufficient to operate that diesel for a period of 5 days while the DG is supplying maximum post loss of coolant accident load demand discussed in the UFSAR, Section 8.3.1.1.7 (Ref. 1). The maximum load demand is calculated using the assumption that a minimum of any two DGs is'available.
This onsite fuel oil capacity is sufficient to operate the DGs for longer than the time to replenish the onsite supply from outside sources.Fuel oil is transferred from storage tank to day tank by either of two transfer pumps associated with each storage tank. Redundancy of pumps and piping precludes the failure of one pump, or the rupture of any pipe, valve or tank to result in the loss of more than one DG. All outside tanks, pumps, and piping are located underground.
For proper operation of the standby DGs, it is necessary to ensure the.proper quality of the fuel oil. Regulatory Guide 1.137 (Ref. 2) addresses the recommended fuel oil practices as supplemented by ANSI N195 (Ref. 3). The fuel oil properties governed by these SRs are the water and sediment content, the kinematic viscosity, specific gravity (or API gravity), and impurity level.Each DG has an air start system with adequate capacity for five successive starts on the DG without recharging the air start receiver(s).
I -, APPLICABLE SAFETY ANALYSES The initial conditions of Design Basis Accident (DBA) and transient analyses in the UFSAR, Chapter 6 (Ref: 4), and in the UFSAR, Chapter 15 (Ref. 5), assume Engineered Safety Feature (ESF) systems are OPERABLE.
The DGs are designed to provide sufficient capacity, capability, redundancy, and reliability to ensure the availability of necessary power to ESF systems so that fuel, Reactor Coolant System and containment design limits are not exceeded.
These limits are discussed in more detail in the Bases for Section 3.2, Power Distribution Limits; Section 3.4, Reactor Coolant System (RCS); and Section 3.6, Containment Systems.Since diesel fuel oil and the air start subsystem support the operation of the standby AC power sources, they satisfy Criterion 3 of 10 CFR 50.36 (Rev. 6).McGuire Units 1 and 2 B 3.8.3-1 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES LCO Stored diesel fuel oil is required to have sufficient supply for 5 days of full load operation.
It is also required to meet specific standards for quality.DG day tank fuel requirements, as well as transfer capability from the storage tank to the day tank, are addressed in LCO 3.8.1, "AC Sources-Operating," and LCO 3.8.2, "AC Sources-Shutdown." This requirement, in conjunction with an ability to obtain replacement supplies within 4 days, supports the availability of DGs required to shut down the reactor and to maintain it in a safe condition for an anticipated operational occurrence (AOO) or a postulated DBA with loss of offsite power.The starting air system is required to have a minimum capacity for 5 successive DG. starts without recharging the air start receivers.
APPLICABILITY The AC sources (LCO 3.8.1 and LCO 3.8.2) are required to ensure the availability of the required power to shut down the reactor and maintain it in a safe shutdown condition after an AOO or a postulated DBA. Since stored diesel fuel oil and the starting air subsystem support LCO 3.8.1 and LCO 3.8.2, stored dieselfuel oil and starting air are required to be within limits when the associated DG is required to be OPERABLE.ACTIONS The ACTIONS Table is modified by a Note indicating that separate Condition entry is allowed for each DG. This is acceptable, since the Required Actions for each Condition prIovide appropriate compensatory actions for each inoperable DG subsystem.
Complying with the Required Actions for one inoperable DG subsystem may allow for continued operation, and subsequent inoperable DG subsystem(s) are governed by separate Condition entry and application of associated Required Actions.AX1 In this Condition, the 5 day fuel oil supply for a DG is not available.
However, the Condition is restricted to fuel oil level reductions that maintain at least a 4 day supply. These circumstances may be caused by events, such as full load operation required after an inadvertent start .while at minimum required level, or feed and bleed operations, which may be necessitated by increasing particulate levels or any number of other oil quality degradations, This restriction allows sufficient time for obtaining the requisite replacement volume and performing the analyses required prior to addition of fuel oil to the tank. A period of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> is considered sufficient to complete restoration of the required level prior to declaring the DG inoperable.
This period is acceptable based on the remaining capacity, (> 4 days), the fact that procedures will be initiated to obtain replenishment, and the low probability of an event during this brief period., McGuire Units 1 and 2 B 3.8.3-2 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES ACTIONS (continued)
B.1 This Condition is entered as a result of a failure to meet the acceptance.
criterion of SR 3.8.3.2. Normally, trending of particulate levels allows sufficient time to correct high particulate levels prior to reaching the limit of acceptability.
Poor sample procedures (bottom sampling), contaminated sampling equipment, and errors in laboratory analysis can produce failures that do not follow a trend. Since the presence of particulates does not mean failure of the fuel oil to burn properly in the diesel engine, and particulate concentration is unlikely to change significantly between Surveillance Frequency intervals, and proper engine performance has been recently demonstrated (within 31 days), it is prudent to allow a brief period prior to declaring the associated DG inoperable.
The 7 day Completion Time allows for further evaluation, resampling and re-analysis of the DG fuel oil.C.1 With the new fuel oil properties defined in the Bases for SR 3.8.3.2 not within the required limits, a period of 30 days is allowed for restoring the stored fuel oil properties.
This period provides sufficient time to test the stored fuel oil to determine that the new fuel oil, when mixed with previously stored fuel oil, remains acceptable, or to restore the stored fuel oil properties.
This restoration may involve feed and bleed procedures, filtering, or combinations of these procedures.
Even if a DG start and load was required during this time interval and the fuel oil properties were outside limits, there is a high likelihood that the DG would still be capable of performing its intended function.D.1 DG starting air system normal alignment allows air from both receivers to enter both left and right starting air headers. When one receiver is isolated, both left and right starting air headers are supplied from the remaining receiver.
With the degraded receiver isolated and the remaining receiver > 210 psig, the capacity for five starts exists and entry into Condition D is not required.
Therefore, Condition D is modified by a Note that states that a single air receiver may be isolated without entering Condition D. Each DG is fully OPERABLE whenever a single starting air receiver is pressurized
> 210 psig and is capable of performing its necessary and related support function.
A single DG receiver pressurized to > 210 psig has sufficient air capacity for five successive DG starts;therefore, entering Condition D when one receiver is isolated is not required.McGuire Units 1 and 2 B 3.8.3-3 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES When a DG starting air receiver is isolated, the redundant DG starting air receiver maintains DG OPERABILITY.
With starting air receiver pressure< 210 psig, sufficient capacity for five successive DG starts does not exist. However, as long as the receiver pressure is > 125 psig, there is adequate capacity for at least one start, and the DG can be considered OPERABLE while the starting air receiver pressure is restored to the required limit. A period of 48 *hours is considered sufficient to complete restoration to the required pressure prior to declaring the DG inoperable.
This period is acceptable based on the remaining air start ,capacity, the ,fact that most DG starts are accomplished on the first attempt, and the low probability of an event during this brief period. Condition E is required whenever the remaining DG starting air receiver is not restored within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or cannot be restored within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.Prior to manually isolating a degraded receiver and upon receiving a diesel start signal, part of the starting air is lost to pressurizing the degraded receiver.
With either starting air receiver pressure < 210 psig and > 125 psig, Condition D applies until the degraded receiver is isolated.
Therefore, alarm response procedures ensure this period is minimized and actions are taken to isolate the degraded receiver.
With the degraded starting air receiver isolated and the remaining receiver pressure > 210 psig, the capacity for five starts exists and the DG can be considered OPERABLE while the repairs necessary to restore the degraded receiver are completed.
E.1 With a Required Action and associated Completion Time not met, or one or more DG's fuel oil'or-starting air subsystem not within limits for reasons other than addressed by Conditions A through .D, the associated DG may*be incapable of performing its intended function and must be immediately declared inoperable.
McGuire Units 1 and 2 B 3.8.3-4 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES SURVEILLANCE SR 3.8.3.1 REQUIREMENTS This SR provides verification that there is an adequate inventory of fuel oil in the storage tanks to support each DG's operation for 5 days at full load.The 4 day period is sufficient time to place the unit in a safe shutdown condition and to bring in replenishment fuel from an offsite location.The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.8.3.2 The tests listed below are a means of determining whether new fuel oil is of the appropriate grade and has not been contaminated with substances that would have an immediate, detrimental impact on diesel engine combustion.
If results from these tests are within acceptable limits, the fuel oil may be added to the storage tanks without concern for contaminating the entire volume of fuel oil in the storage tanks. These tests are to be conducted prior to adding the new fuel to the storage tank(s). The tests, limits, and applicable ASTM Standards are as follows: a. Sample the new fuel oil in accordance with ASTM D4057 (Ref. 7);b. Verify in accordance with the tests specified in ASTM D975 that the sample has a kinematic viscosity at 40 0 C of > 1.9 centistokes and< 4.1 centistokes, and a flash point of > 125 0 F; and c. Verify that the new fuel oil has a clear and bright appearance with proper color when tested in accordance with ASTM D4176 (Ref. 7)or a water and sediment content within limits when tested in accordance with ASTM D2709 (Ref. 7); and d. Verify that the new fuel oil has an absolute specific gravity at 60 1 60°F of > 0.83 and < 0.89 when tested in accordance with ASTM D1298 or an API gravity at 60OF of> 270 and < 390 when tested in accordance with ASTM D287 (Ref.7).McGuire Units 1 and 2 B 3.8.3-5 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES SURVEILLANCE REQUIREMENTS (continued)
Failure to meet any of the above limits, except for clear and bright, is cause for rejecting the fuel oil, but does not represent a failure to meet the LCO concern since the fuel oil is not added to the storage tanks. If the fuel oil fails on clear and bright, it may be accepted if it passes water and sediment.
The specifications for water and sediment recognize that a small amount of water and sediment is acceptable.
Thus, this test may be used after a clear and bright test to provide a more quantitative result.Within 31 days following the initial new fuel oil sample, the fuel oil is analyzed to establish that the other properties specified in Table 1 of ASTM D975 (Ref. 7) are met for new fuel oil when tested in accordance with ASTM D975 (Ref. 7), except that the analysis for sulfur may be performed in accordance with ASTM D5453 (Ref. 7), D3120 (Ref. 7) or ASTM D2622 (Ref. 7). The 31 day period is acceptable because the fuel oil properties of interest, even if they were not within stated limits, would not have an immediate effect on DG operation.
This Surveillance ensures the availability of high quality fuel oil for the DGs.Fuel oil degradation during long term storage shows up as an increase in particulate, due mostly to oxidation.
The presence of particulate does not mean the fuel oil will not burn properly in a diesel'engine.
The particulate can cause fouling of filters and fuel oil injection equipment, however, which can cause engine failure.Particulate concentrations should be determined based on ASTM D6217 (Ref. 7). This test method is used for assessing the mass quantity of particulates in middle distillate fuels, which includes 2-D diesel fuel. This method involves a gravimetric determination of total particulate concentration in the fuel oil and has a limit of 10 mg/I. For those designs in which the total stored fuel oil volume is contained in two or more interconnected tanks, each tank must be considered and tested separately.
The Frequency of this test takes into consideration fuel oil degradation trends that indicate that particulate concentration is unlikely to change significantly between Frequency intervals.
McGuire Units 1 and 2 B 3.8.3-6 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES SURVEILLANCE REQUIREMENTS, (continued)
SR 3.8.3.3 This Surveillance ensures that,: without the aid of the refill compressor, sufficient air start capacity for each DG is available.
The system design requirements provide for a minimum of five engine start cycles without recharging.
A start cycle is defined as the period of time required to reach 95% speed from standby prelubed condition'.
The pressure specified in this SR is intended to reflect a conservative value at which a single fast start and five total starts can be accomplished.
The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program.SR 3.8.3.4 Microbiological fouling is a major cause of fuel oil degradation.
There are numerous bacteria that can grow in fuel oil and cause fouling, but all must have a water environment in order to survive. Removal of water from the fuel storage tanks eliminates the necessary environment for bacterial survival.
This is the most effective means of controlling microbiological fouling. In addition, it eliminates the potential for water entrainment in the fuel oil during DG operation.
Water may come from any of several sources, including condensation, ground water, rain water, and contaminated fuel oil, and from breakdown of the fuel oil by bacteria.Frequent checking for and removal of accumulated water minimizes fouling and provides data regarding the watertight integrity of the fuel oil system. The Surveillance Frequency is based on operating experience, equipment reliability, and plant risk and is controlled under the Surveillance Frequency Control Program. This SR is for preventive maintenance.
The presence of water does not necessarily represent failure of this SR, provided the accumulated water is removed during performance of the Surveillance.
McGuire Units 1 and 2 B 3.8.3-7 Revision No. 123 Diesel Fuel Oil and Starting Air B 3.8.3 BASES REFERENCES 1.2.3.4.5.-6.7.UFSAR, Section 8.3.1.1.7.
Regulatory Guide 1.137.ANSI N195-1976, Appendix B.'UFSAR, Chapter 6.UFSAR, Chapter 15.10 CFR 50:36, Technical Specifications,-(c)(2)(ii)..
ASTM Standards:
D4057; D975;.D1298; D4176; D2709; D6217;D2622; D287; D5453; and D3120.UFSAR, Section 18.2.4, Chemistry Control Program.McGuire License Renewal Commitments MCS-1274.00-00-0016, Section 4.6, Chemistry Control Program.8.9.McGuire Units 1 and 2 B 3.8.3-8 Revision N6.123