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{{#Wiki_filter:Attachment 3 to ULNRC-06477 Page 1 of6 ATTACHMENT 3 PROPOSED TS EASES CHANGES (for information only) | {{#Wiki_filter:Attachment 3 to ULNRC-06477 Page 1 of6 ATTACHMENT 3 PROPOSED TS EASES CHANGES (for information only) | ||
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC)System ULNRC-06477 B 3 7 20 Page2of6 B3.7 PLANT SYSTEMS B 3.7.20 Class 1E Electrical Equipment Air Conditioning (A/C)System BACKGROUND The Class 1E electrical equipment air conditioning (A/C)trains provide a suitable environment for the Class 1E electrical equipment. | |||
These air-conditioning trains provide temperature control for the Engineered Safety Features (ESF)switchgear room components, DC switchboard room components, and NK battery room components. | Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page2of6 B3.7 PLANT SYSTEMS B 3.7.20 Class 1E Electrical Equipment Air Conditioning (A/C) System BACKGROUND The Class 1E electrical equipment air conditioning (A/C) trains provide a suitable environment for the Class 1E electrical equipment. These air-conditioning trains provide temperature control for the Engineered Safety Features (ESF) switchgear room components, DC switchboard room components, and NK battery room components. The specific rooms supplied by the Class 1E electrical equipment A/C trains are: | ||
The specific rooms supplied by the Class 1E electrical equipment A/C trains are: SGKO5A SGKO5B SWBD RM No.1 (3408)SWBD RM No.4 (3404)SWBD RM No.3 (3414)SWBD RM No.2 (3410)Battery RM No.1 (3407)Battery RIME No.4 (3405)BatteryRMNo.3 (3413)BatteryRMNo.2 (3411)ESF SWGR RM No.1 (3301)ESF SWGR RM No.2 (3302)The Class 1E electrical equipment A/C system consists of two independent trains such that each train provides cooling of recirculated air in the rooms normally dedicated to that train.Each train consists of a prefilter, self-contained refrigeration unit (using normal service water or essential service water (ESW)as a heat sink), centrifugal fans, instrumentation, and controls to provide for electrical equipment room temperature control.The Class 1 E electrical equipment A/C trains have emergency operation functions and also operate during normal unit operation. | SGKO5A SGKO5B SWBD RM No. 1 (3408) SWBD RM No. 4 (3404) | ||
Each train is normally aligned to cool only the equipment associated with its emergency load group.The Class 1E electrical equipment A/C trains are operated in a continuous recirculation mode to maintain the ESF switchgear rooms, the battery rooms, and the DC switchboard rooms to a temperature of 90°F (Ref.1).Additional recirculation capability is provided via standby fans and dampers that may be actuated via operator action.With one Class 1E electrical equipment A/C train inoperable, the additional recirculation capability may be utilized in conjunction with the remaining Class 1E electrical equipment A/C train to provide adequate area cooling for both trains of Class 1E electrical equipment during normal and accident conditions. | SWBD RM No. 3 (3414) SWBD RM No. 2 (3410) | ||
Callaway Plant Revision XX Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC)System ULNRC-06477 B 3 7 20 Page3of6 BASES APPLICABLE The design basis ofthe Class 1E Electrical Equipment A/C System is to SAFETY ANALYSES maintain temperatures in the Class 1E electrical equipment rooms within limits to assure OPERABILITY of the associated electrical equipment. | Battery RM No. 1 (3407) Battery RIME No. 4 (3405) | ||
This support function for the Class 1E electrical equipment in turn supports the Engineered Safety Feature (ESF)systems that are required to be OPERABLE consistent with the assumptions and initial conditions of the design-basis accident (DBA)and transient analyses in the FSAR (Chapters 6 and 15), including the unavailability of offsite power, as applicable. | BatteryRMNo.3 (3413) BatteryRMNo.2 (3411) | ||
The Class 1 E Electrical Equipment A/C System is designed so that the single failure of an active component coincident with a design basis accident (DBA)cannot impair the ability of the supported systems powered by the electrical equipment to fulfill their safety functions. | ESF SWGR RM No. 1 (3301) ESF SWGR RM No. 2 (3302) | ||
During nonnal operations each Class 1E electrical equipment A/C train maintains the temperature in its associated electrical equipment rooms at a temperature 90°F.For DBA conditions, a Class 1E electrical equipment A/C train is required to maintain the associated electrical equipment room temperatures 1 04°F.The Class 1E electrical equipment A/C trains are designed in accordance with Seismic Category I requirements. | The Class 1E electrical equipment A/C system consists of two independent trains such that each train provides cooling of recirculated air in the rooms normally dedicated to that train. Each train consists of a prefilter, self-contained refrigeration unit (using normal service water or essential service water (ESW) as a heat sink), centrifugal fans, instrumentation, and controls to provide for electrical equipment room temperature control. | ||
The Class 1 E electrical equipment A/C trains have emergency operation functions and also operate during normal unit operation. Each train is normally aligned to cool only the equipment associated with its emergency load group. | |||
The Class 1E electrical equipment A/C trains are operated in a continuous recirculation mode to maintain the ESF switchgear rooms, the battery rooms, and the DC switchboard rooms to a temperature of 90°F (Ref. 1). | |||
Additional recirculation capability is provided via standby fans and dampers that may be actuated via operator action. With one Class 1E electrical equipment A/C train inoperable, the additional recirculation capability may be utilized in conjunction with the remaining Class 1E electrical equipment A/C train to provide adequate area cooling for both trains of Class 1E electrical equipment during normal and accident conditions. | |||
Callaway Plant Revision XX | |||
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page3of6 BASES APPLICABLE The design basis ofthe Class 1E Electrical Equipment A/C System is to SAFETY ANALYSES maintain temperatures in the Class 1E electrical equipment rooms within limits to assure OPERABILITY of the associated electrical equipment. This support function for the Class 1E electrical equipment in turn supports the Engineered Safety Feature (ESF) systems that are required to be OPERABLE consistent with the assumptions and initial conditions of the design-basis accident (DBA) and transient analyses in the FSAR (Chapters 6 and 15), including the unavailability of offsite power, as applicable. The Class 1 E Electrical Equipment A/C System is designed so that the single failure of an active component coincident with a design basis accident (DBA) cannot impair the ability of the supported systems powered by the electrical equipment to fulfill their safety functions. | |||
During nonnal operations each Class 1E electrical equipment A/C train maintains the temperature in its associated electrical equipment rooms at a temperature 90°F. For DBA conditions, a Class 1E electrical equipment A/C train is required to maintain the associated electrical equipment room temperatures 1 04°F. The Class 1E electrical equipment A/C trains are designed in accordance with Seismic Category I requirements. | |||
The Class 1E Electrical Equipment A/C System satisfies Criterion 3 of 10 CFR 50.3 6(c)(2)(ii). | The Class 1E Electrical Equipment A/C System satisfies Criterion 3 of 10 CFR 50.3 6(c)(2)(ii). | ||
LCO Two independent Class lE electrical equipment A/C trains are required to be OPERABLE to ensure adequate cooling to their associated electrical equipment rooms during normal operation. | LCO Two independent Class lE electrical equipment A/C trains are required to be OPERABLE to ensure adequate cooling to their associated electrical equipment rooms during normal operation. Each Class lE electrical equipment A/C train is considered to be OPERABLE when the individual components necessary to maintain associated electrical equipment room temperatures within acceptable limits are OPERABLE. These components include (for each train) the refrigeration compressor, heat exchanger, cooling coils, ESW or normal service water flow, fans and associated temperature control instrumentation. In addition each Class 1E electrical equipment A/C train must be OPERABLE to the extent that air circulation can be maintained. | ||
Each Class lE electrical equipment A/C train is considered to be OPERABLE when the individual components necessary to maintain associated electrical equipment room temperatures within acceptable limits are OPERABLE.These components include (for each train)the refrigeration compressor, heat exchanger, cooling coils, ESW or normal service water flow, fans and associated temperature control instrumentation. | APPLICABILITY In MODES 1 2, 3, and 4, the Class 1E Electrical Equipment A/C System is a normally operating system with both trains in operation. Both trains must be OPERABLE to ensure that temperature in the protected rooms will not exceed equipment design limits. | ||
In addition each Class 1E electrical equipment A/C train must be OPERABLE to the extent that air circulation can be maintained. | Although the LCO for the Class 1E Electrical Equipment A/C System is not applicable in MODES 5 and 6, the capability of the Class 1E Electrical Equipment A/C System to perform its necessary related support functions may be required for OPERABILITY of supported systems. | ||
APPLICABILITY In MODES 1 | Callaway Plant Revision XX | ||
Both trains must be OPERABLE to ensure that temperature in the protected rooms will not exceed equipment design limits.Although the LCO for the Class 1E Electrical Equipment A/C System is not applicable in MODES 5 and 6, the capability of the Class 1E Electrical Equipment A/C System to perform its necessary related support functions may be required for OPERABILITY of supported systems.Callaway Plant Revision XX Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC)System ULNRC-06477 B 3 7 20 Page4of6.BASES ACTIONS A.1 Al and A.3 With one Class 1E electrical equipment A/C train inoperable, acceptable room temperatures for both trains of electrical equipment can be maintained if action is initiated immediately to implement mitigating actions.These include placing into service the Class 1E electrical equipment A!C supplemental cooling system to provide additional recirculation capability, as initiated via operator action.This mitigating action(s)should be preplanned and/or proceduralized for implementation upon entry into the Condition, regardless of whether entry is intentional or unintentional. | |||
The room area temperature limit of 90°f is based on the normal operating maximum steady-state environmental condition and a plant specific calculation for a single Class 1E electrical equipment A/C train maintaining both Class 1E electrical equipment train rooms at a temperature of 104°F during design basis accident conditions. | Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page4of6 . | ||
The plant specific calculation assumes the affected room area temperatures are 5 90°f at the onset of the design basis accident.With one Class 1E electrical equipment A/C train inoperable, the overall reliability of the cooling function is reduced.However, the remaining OPERABLE train can provide the required cooling function if mitigating actions are taken, including placing the Class 1E electrical equipment A/C supplemental cooling system into service, assuming the OPERABLE Class 1E electrical equipment A/C train is capable of operating at full capacity.Verifying the room area temperatures within 1 hour and every 4 hours thereafter is adequate to ensure temperatures remain below 90°f.The 4 hour Completion Time is reasonable based on the minimal increase in room temperatures expected during this time period, with the mitigating actions in place.Callaway Plant Revision XX Attachment 3 to Class 1 E Electrical Equipment Air-Conditioning (NC)System ULNRC-06477 B3720 | BASES ACTIONS A. 1 Al and A.3 With one Class 1E electrical equipment A/C train inoperable, acceptable room temperatures for both trains of electrical equipment can be maintained if action is initiated immediately to implement mitigating actions. These include placing into service the Class 1E electrical equipment A!C supplemental cooling system to provide additional recirculation capability, as initiated via operator action. This mitigating action(s) should be preplanned and/or proceduralized for implementation upon entry into the Condition, regardless of whether entry is intentional or unintentional. | ||
The inoperable Class 1E electrical equipment A/C train must be restored to OPERABLE status within 30 days.The 30 day Completion Time is based on the capability of the remaining OPERABLE Class 1 E electrical equipment A/C train to provide adequate area cooling for both trains of electrical equipment during normal and accident conditions (with mitigating actions implemented). | The room area temperature limit of 90°f is based on the normal operating maximum steady-state environmental condition and a plant specific calculation for a single Class 1E electrical equipment A/C train maintaining both Class 1E electrical equipment train rooms at a temperature of 104°F during design basis accident conditions. The plant specific calculation assumes the affected room area temperatures are 5 90°f at the onset of the design basis accident. | ||
If the room area temperatures are not verified to be within limits as required once per 4 hours, or if the inoperable Class 1 E electrical equipment A/C train cannot be restored to OPERABLE status within 30 days, Condition B must be entered.B.l andB.2 When the Required Actions of Condition A cannot be completed within the required Completion Times, the unit must be placed in a MODE that minimizes accident risk.To achieve this status, the unit must be placed in MODE 3 within 6 hours and in MODE 5 within 36 hours.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.C.l If both Class 1 E electrical equipment A/C trains are inoperable in MODE 1 | With one Class 1E electrical equipment A/C train inoperable, the overall reliability of the cooling function is reduced. However, the remaining OPERABLE train can provide the required cooling function if mitigating actions are taken, including placing the Class 1E electrical equipment A/C supplemental cooling system into service, assuming the OPERABLE Class 1E electrical equipment A/C train is capable of operating at full capacity. | ||
SURVEILLANCE SR 3.7.20.1 REQUIRMENTS This SR verifies that each Class 1E electrical equipment A/C train starts and operates on an actual or simulated actuation signal.The actuation signal includes the Control Room Ventilation Isolation Signal (CRVIS).A CRVIS is generated by the inputs discussed in the Bases for LCO 3.3.7, | Verifying the room area temperatures within 1 hour and every 4 hours thereafter is adequate to ensure temperatures remain below 90°f. The 4 hour Completion Time is reasonable based on the minimal increase in room temperatures expected during this time period, with the mitigating actions in place. | ||
The Surveillance Requirement also verifies that a control room ventilation isolation signal (CRVIS)will be received by the LOCA sequencer to enable an automatic start of the diesel generator loads that are associated with a CRVIS.Verification that these loads will start and operate at the appropriate step in the LOCA sequencer and that other auto-start signals for these loads will be inhibited until the LOCA sequencer is reset is accomplished under Surveillance Requirement SR 3 | Callaway Plant Revision XX | ||
This SR verifies that the heat removal capability of the air conditioning units is adequate to remove the heat load assumed in the Class 1E electrical equipment rooms during design basis accidents. | |||
Since testing of the Class 1E Electrical Equipment Air Conditioning (A/C)System condenser heat exchangers under design conditions is impractical, this SR consists of verifying the heat removal capability of the condenser heat exchanger (either through performance testing or inspection), ensuring the proper operation of major components in the refrigeration cycle, verification of unit air flow capacity, and water flow measurement. | Attachment 3 to Class 1 E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 Page5of6 B3720 BASES ACTIONS A. 1 Al and A.3 (continued) | ||
This SR is performed in the same manner as SR 3.7.11.1 (Reference 2).The Surveillance Frequency is based on operating experience (which shows that significant degradation of the Class 1 E Electrical Equipment AIC typically occurs gradually and in a self-revealing manner.)The surveillance frequency is controlled under the Surveillance Frequency Control Program.REFERENCES 1.FSAR, Section 9.4.1 2.Letter from C.F Lyon, USNRC, to F.Diya, Union Electric Company, | The inoperable Class 1E electrical equipment A/C train must be restored to OPERABLE status within 30 days. The 30 day Completion Time is based on the capability of the remaining OPERABLE Class 1 E electrical equipment A/C train to provide adequate area cooling for both trains of electrical equipment during normal and accident conditions (with mitigating actions implemented). | ||
Callaway Plant Revision XX}} | If the room area temperatures are not verified to be within limits as required once per 4 hours, or if the inoperable Class 1 E electrical equipment A/C train cannot be restored to OPERABLE status within 30 days, Condition B must be entered. | ||
B.l andB.2 When the Required Actions of Condition A cannot be completed within the required Completion Times, the unit must be placed in a MODE that minimizes accident risk. To achieve this status, the unit must be placed in MODE 3 within 6 hours and in MODE 5 within 36 hours. 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. | |||
C.l If both Class 1 E electrical equipment A/C trains are inoperable in MODE 1 2, 3 or 4, the capability to maintain acceptable temperatures for the Class 1E electrical equipment is significantly degraded. Therefore, LCO 3.0.3 must be entered immediately. | |||
SURVEILLANCE SR 3.7.20.1 REQUIRMENTS This SR verifies that each Class 1E electrical equipment A/C train starts and operates on an actual or simulated actuation signal. The actuation signal includes the Control Room Ventilation Isolation Signal (CRVIS). A CRVIS is generated by the inputs discussed in the Bases for LCO 3.3.7, CREVS Actuation Instrumentation. The Surveillance Requirement also verifies that a control room ventilation isolation signal (CRVIS) will be received by the LOCA sequencer to enable an automatic start of the diesel generator loads that are associated with a CRVIS. Verification that these loads will start and operate at the appropriate step in the LOCA sequencer and that other auto-start signals for these loads will be inhibited until the LOCA sequencer is reset is accomplished under Surveillance Requirement SR 3 8 1 12. The Surveillance frequency is based on industry operating experience, equipment reliability and plant risk, and is controlled under the Surveillance Frequency Control Program. | |||
Callaway Plant Revision XX | |||
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 Page 6 of 6 B 37.20 BASES SURVEILLANCE SR 3.7.20.2 REQUWMENTS (continued) This SR verifies that the heat removal capability of the air conditioning units is adequate to remove the heat load assumed in the Class 1E electrical equipment rooms during design basis accidents. Since testing of the Class 1E Electrical Equipment Air Conditioning (A/C) System condenser heat exchangers under design conditions is impractical, this SR consists of verifying the heat removal capability of the condenser heat exchanger (either through performance testing or inspection), ensuring the proper operation of major components in the refrigeration cycle, verification of unit air flow capacity, and water flow measurement. This SR is performed in the same manner as SR 3.7.11.1 | |||
( Reference 2). | |||
The Surveillance Frequency is based on operating experience (which shows that significant degradation of the Class 1 E Electrical Equipment AIC typically occurs gradually and in a self-revealing manner.) The surveillance frequency is controlled under the Surveillance Frequency Control Program. | |||
REFERENCES | |||
: 1. FSAR, Section 9.4.1 | |||
: 2. Letter from C.F Lyon, USNRC, to F. Diya, Union Electric Company, Callaway Plant, Unit 1 Interpretation ofTecimical Specification Surveillance Requirement 3.7.1 1 .1, Verify Each CRACS Train Has The Capability to Remove The Assumed Heat Load (TAC NO. MF3665), May 28, 2014. | |||
: 3. LDCN 16-0013, Incorporate new Technical Specification 3.7.20 into OL Appendix A, and update FSAR and TSB accordingly. | |||
Callaway Plant Revision XX}} | |||
Latest revision as of 14:05, 2 February 2020
| ML19024A473 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/23/2019 |
| From: | Ameren Missouri |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19027A469 | List: |
| References | |
| LDCN 16-0013, ULNRC-06477 | |
| Download: ML19024A473 (6) | |
Text
Attachment 3 to ULNRC-06477 Page 1 of6 ATTACHMENT 3 PROPOSED TS EASES CHANGES (for information only)
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page2of6 B3.7 PLANT SYSTEMS B 3.7.20 Class 1E Electrical Equipment Air Conditioning (A/C) System BACKGROUND The Class 1E electrical equipment air conditioning (A/C) trains provide a suitable environment for the Class 1E electrical equipment. These air-conditioning trains provide temperature control for the Engineered Safety Features (ESF) switchgear room components, DC switchboard room components, and NK battery room components. The specific rooms supplied by the Class 1E electrical equipment A/C trains are:
SGKO5A SGKO5B SWBD RM No. 1 (3408) SWBD RM No. 4 (3404)
SWBD RM No. 3 (3414) SWBD RM No. 2 (3410)
Battery RM No. 1 (3407) Battery RIME No. 4 (3405)
BatteryRMNo.3 (3413) BatteryRMNo.2 (3411)
ESF SWGR RM No. 1 (3301) ESF SWGR RM No. 2 (3302)
The Class 1E electrical equipment A/C system consists of two independent trains such that each train provides cooling of recirculated air in the rooms normally dedicated to that train. Each train consists of a prefilter, self-contained refrigeration unit (using normal service water or essential service water (ESW) as a heat sink), centrifugal fans, instrumentation, and controls to provide for electrical equipment room temperature control.
The Class 1 E electrical equipment A/C trains have emergency operation functions and also operate during normal unit operation. Each train is normally aligned to cool only the equipment associated with its emergency load group.
The Class 1E electrical equipment A/C trains are operated in a continuous recirculation mode to maintain the ESF switchgear rooms, the battery rooms, and the DC switchboard rooms to a temperature of 90°F (Ref. 1).
Additional recirculation capability is provided via standby fans and dampers that may be actuated via operator action. With one Class 1E electrical equipment A/C train inoperable, the additional recirculation capability may be utilized in conjunction with the remaining Class 1E electrical equipment A/C train to provide adequate area cooling for both trains of Class 1E electrical equipment during normal and accident conditions.
Callaway Plant Revision XX
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page3of6 BASES APPLICABLE The design basis ofthe Class 1E Electrical Equipment A/C System is to SAFETY ANALYSES maintain temperatures in the Class 1E electrical equipment rooms within limits to assure OPERABILITY of the associated electrical equipment. This support function for the Class 1E electrical equipment in turn supports the Engineered Safety Feature (ESF) systems that are required to be OPERABLE consistent with the assumptions and initial conditions of the design-basis accident (DBA) and transient analyses in the FSAR (Chapters 6 and 15), including the unavailability of offsite power, as applicable. The Class 1 E Electrical Equipment A/C System is designed so that the single failure of an active component coincident with a design basis accident (DBA) cannot impair the ability of the supported systems powered by the electrical equipment to fulfill their safety functions.
During nonnal operations each Class 1E electrical equipment A/C train maintains the temperature in its associated electrical equipment rooms at a temperature 90°F. For DBA conditions, a Class 1E electrical equipment A/C train is required to maintain the associated electrical equipment room temperatures 1 04°F. The Class 1E electrical equipment A/C trains are designed in accordance with Seismic Category I requirements.
The Class 1E Electrical Equipment A/C System satisfies Criterion 3 of 10 CFR 50.3 6(c)(2)(ii).
LCO Two independent Class lE electrical equipment A/C trains are required to be OPERABLE to ensure adequate cooling to their associated electrical equipment rooms during normal operation. Each Class lE electrical equipment A/C train is considered to be OPERABLE when the individual components necessary to maintain associated electrical equipment room temperatures within acceptable limits are OPERABLE. These components include (for each train) the refrigeration compressor, heat exchanger, cooling coils, ESW or normal service water flow, fans and associated temperature control instrumentation. In addition each Class 1E electrical equipment A/C train must be OPERABLE to the extent that air circulation can be maintained.
APPLICABILITY In MODES 1 2, 3, and 4, the Class 1E Electrical Equipment A/C System is a normally operating system with both trains in operation. Both trains must be OPERABLE to ensure that temperature in the protected rooms will not exceed equipment design limits.
Although the LCO for the Class 1E Electrical Equipment A/C System is not applicable in MODES 5 and 6, the capability of the Class 1E Electrical Equipment A/C System to perform its necessary related support functions may be required for OPERABILITY of supported systems.
Callaway Plant Revision XX
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 B 3 7 20 Page4of6 .
BASES ACTIONS A. 1 Al and A.3 With one Class 1E electrical equipment A/C train inoperable, acceptable room temperatures for both trains of electrical equipment can be maintained if action is initiated immediately to implement mitigating actions. These include placing into service the Class 1E electrical equipment A!C supplemental cooling system to provide additional recirculation capability, as initiated via operator action. This mitigating action(s) should be preplanned and/or proceduralized for implementation upon entry into the Condition, regardless of whether entry is intentional or unintentional.
The room area temperature limit of 90°f is based on the normal operating maximum steady-state environmental condition and a plant specific calculation for a single Class 1E electrical equipment A/C train maintaining both Class 1E electrical equipment train rooms at a temperature of 104°F during design basis accident conditions. The plant specific calculation assumes the affected room area temperatures are 5 90°f at the onset of the design basis accident.
With one Class 1E electrical equipment A/C train inoperable, the overall reliability of the cooling function is reduced. However, the remaining OPERABLE train can provide the required cooling function if mitigating actions are taken, including placing the Class 1E electrical equipment A/C supplemental cooling system into service, assuming the OPERABLE Class 1E electrical equipment A/C train is capable of operating at full capacity.
Verifying the room area temperatures within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> thereafter is adequate to ensure temperatures remain below 90°f. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time is reasonable based on the minimal increase in room temperatures expected during this time period, with the mitigating actions in place.
Callaway Plant Revision XX
Attachment 3 to Class 1 E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 Page5of6 B3720 BASES ACTIONS A. 1 Al and A.3 (continued)
The inoperable Class 1E electrical equipment A/C train must be restored to OPERABLE status within 30 days. The 30 day Completion Time is based on the capability of the remaining OPERABLE Class 1 E electrical equipment A/C train to provide adequate area cooling for both trains of electrical equipment during normal and accident conditions (with mitigating actions implemented).
If the room area temperatures are not verified to be within limits as required once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or if the inoperable Class 1 E electrical equipment A/C train cannot be restored to OPERABLE status within 30 days, Condition B must be entered.
B.l andB.2 When the Required Actions of Condition A cannot be completed within the required Completion Times, the unit must be placed in a MODE that minimizes accident risk. To achieve this status, the unit must be placed in MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in 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 unit conditions from full power conditions in an orderly manner and without challenging unit systems.
C.l If both Class 1 E electrical equipment A/C trains are inoperable in MODE 1 2, 3 or 4, the capability to maintain acceptable temperatures for the Class 1E electrical equipment is significantly degraded. Therefore, LCO 3.0.3 must be entered immediately.
SURVEILLANCE SR 3.7.20.1 REQUIRMENTS This SR verifies that each Class 1E electrical equipment A/C train starts and operates on an actual or simulated actuation signal. The actuation signal includes the Control Room Ventilation Isolation Signal (CRVIS). A CRVIS is generated by the inputs discussed in the Bases for LCO 3.3.7, CREVS Actuation Instrumentation. The Surveillance Requirement also verifies that a control room ventilation isolation signal (CRVIS) will be received by the LOCA sequencer to enable an automatic start of the diesel generator loads that are associated with a CRVIS. Verification that these loads will start and operate at the appropriate step in the LOCA sequencer and that other auto-start signals for these loads will be inhibited until the LOCA sequencer is reset is accomplished under Surveillance Requirement SR 3 8 1 12. The Surveillance frequency is based on industry operating experience, equipment reliability and plant risk, and is controlled under the Surveillance Frequency Control Program.
Callaway Plant Revision XX
Attachment 3 to Class I E Electrical Equipment Air-Conditioning (NC) System ULNRC-06477 Page 6 of 6 B 37.20 BASES SURVEILLANCE SR 3.7.20.2 REQUWMENTS (continued) This SR verifies that the heat removal capability of the air conditioning units is adequate to remove the heat load assumed in the Class 1E electrical equipment rooms during design basis accidents. Since testing of the Class 1E Electrical Equipment Air Conditioning (A/C) System condenser heat exchangers under design conditions is impractical, this SR consists of verifying the heat removal capability of the condenser heat exchanger (either through performance testing or inspection), ensuring the proper operation of major components in the refrigeration cycle, verification of unit air flow capacity, and water flow measurement. This SR is performed in the same manner as SR 3.7.11.1
( Reference 2).
The Surveillance Frequency is based on operating experience (which shows that significant degradation of the Class 1 E Electrical Equipment AIC typically occurs gradually and in a self-revealing manner.) The surveillance frequency is controlled under the Surveillance Frequency Control Program.
REFERENCES
- 1. FSAR, Section 9.4.1
- 2. Letter from C.F Lyon, USNRC, to F. Diya, Union Electric Company, Callaway Plant, Unit 1 Interpretation ofTecimical Specification Surveillance Requirement 3.7.1 1 .1, Verify Each CRACS Train Has The Capability to Remove The Assumed Heat Load (TAC NO. MF3665), May 28, 2014.
- 3. LDCN 16-0013, Incorporate new Technical Specification 3.7.20 into OL Appendix A, and update FSAR and TSB accordingly.
Callaway Plant Revision XX