ML16028A191

Oconee, Technical Specification Base Change

ML16028A191
Person / Time
Site:	Oconee
Issue date:	01/20/2016
From:	Batson S L Duke Energy Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ONS -2015-122
Download: ML16028A191 (13)

Text

DUKE scotL.BsonENERGY°2 Vice PresidentLI 4L~~ IOconee Nuclear StationDuke EnergyONO1VP 1 7800 Rochester HwySeneca, SC 29672o: 864.873.3274f. 864.873, 4208ON S -201 5 -122 scott. Batson~duke -energy. comJanuary 20, 2016ATTN: Document Control DeskU.S. Nuclear Regulatory Commission11555 Rockville PikeRockville, Maryland 20852

Subject:

Duke Energy Carolinas, LLCOconee Nuclear StationDocket Numbers 50-269, 50-270, and 50-287Technical Specification (TS) Bases ChangePlease find attached changes to the Oconee Nuclear Station (ONS) TS Bases. These changeswere processed in accordance with the provisions of Technical Specification 5.5.15, "TechnicalSpecifications (TS) Bases Control Program."Amendments 394/396/395 were issued for Oconee to revise ONS TS 3.4.15, to define a newtime limit for restoring inoperable Reactor Coolant System (RCS) leakage detectioninstrumentation to operable status and to establish alternate methods of monitoring RCSleakage when one or more required monitors are inoperable in accordance with TS Task ForceTraveler (TSTF) 513, Revision 3, "Revise Pressurized-Water Reactor Operability Requirementsand actions for Reactor Coolant System Leakage Instrumentation."The associated TSTF-513 revision to TS Bases 3.4.15 was to clearly define the RCS leakagedetection instrumentation Operability requirements in the Limiting Condition for Operation (LCO) Bases and to eliminate discussion from the Bases that could be erroneously construed asOperability requirements. The Bases were also revised to reflect the changes to the Technicalspecifications and to more accurately reflect the existing Technical Specifications.Any questions regarding this information should be directed to Stephen C. Newman, ONSRegulatory Affairs Group, at (864) 873-4388.Sincerely,Vice PresidentOconee Nuclear StationAttachment \www.duke-energy.com U. S. Nuclear Regulatory CommissionJanuary 20, 2016Page 2cc: Ms. Catherine HaneyAdministrator, Region I1U.S. Nuclear Regulatory Commission, Region IIMarquis One Tower245 Peachtree Center Ave., NE, Suite 1200Atlanta, GA 30303-1257Mr. James R. Hall, Senior Project Manager (ONS)(By electronic mail only)U. S. Nuclear Regulatory CommissionOffice of Nuclear Reactor Regulation11555 Rockville PikeMail Stop O-8G9ARockville, MD 20852Mr. Jeffrey A. Whited, Project Manager(By electronic mail only)U. S. Nuclear Regulatory CommissionOffice of Nuclear Reactor Regulation11555 Rockville PikeMail Stop O-8B1ARockville, MD 20852Mr. Eddy CroweSenior Resident InspectorOconee Nuclear Station ONS-201 5-122January 20, 2016AttachmentRevised Oconee Nuclear Station TSB Manual PagesTSB List of Effective Pages (LOEPs), Rev. 003 LOEP 1-4TSB 3.4.15, RCS Leakage Detection Instrumentation 3.4.15-1 thru 6www.duke-energy.com OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERIMPLEMENTATION DATETOCB 2.1.1B 2.1.2B3.0B 3.1.1B 3.1.2B 3.1.3B 3.1.4B 3.1.5B 3.1.6B 3.1.7B 3.1.8B 3.2.1B3 3.2.2B 3.2.3B 3.3.1B 3.3.2B 3.3.3B 3.3.4B 3.3.5B 3.3.6B 3.3.7B 3.3.8B 3.3.9B 3.3.10B 3.3.11B 3.3.12o000000o000o00000000000000000000000000000000000001000000000000000000000000000o00000009/03/1405/31/1202/06/1410/20/1105/16/1205/16/1206/02/9907/23/1205/16/1207/23/1207/23/1205/16/1205/16/1205/16/1205/16/1209/30/1512/14/0412/10/1412/10/1412/10/1412/10/1412/10/1405/16/1205/16/1205/16/1205/16/1205/16/12Oconee Nuclear StationLEP1Rvso03LOEP 1Revision 003 OCONEE NUJCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.3.13B 3.3.14B 3.3.15B 3.3.16B 3.3.17B 3.3.18B 3.3.19B 3.3.20B 3.3.21B 3.3.22B 3.3.23B 3.3.24B 3.3.25B 3.3.26B 3.3.27B 3.3.28B 3.4.1B 3.4.2B 3.4.3B 3.4.4B 3.4.5B 3.4.6B 3.4.7B 3.4.8B 3.4.9B 3.4.10B 3.4.111B 3.4.12o000000000o000000000000000000000000000000000o00000000000000000000000000000o00001o00000005/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/1 6/1205/16/1209/26/0111/05/0311/05/0312/10/1405/16/1205/16/1212/16/9803/04/1505/16/1205/16/1205/16/1205/16/1205/16/1205/16/1209/21/1510/12/1206/13/14Oconee Nuclear StationLEP2Rvso03LOEP 2Revision 003 OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.4.13B 3.4.14B 3.4.15B 3.4.16B 3.5.1B 3.5.2B 3.5.3B 3.5.4B 3.6.1B 3.6.2B 3.6.3B 3.6.4B 3.6.5B 3.7.1B 3.7.2B 3.7.3B 3.7.4B 3.7.5B 3.7.6B 3.7.7B 3.7.8B 3.7.9B 3.7.10B 3.7.l0aB 3.7.11B 3.7.12B 3.7.13B 3.7.1400000100100000000100100000000000000000100100000100000100000000000000000000000000000005/16/1209/21/1511/24/1504/02/0705/16/1209/21/1509/21/1505/16/1210/20/1105/16/1205/16/1205/16/1209/21/1509/21/1511/13/1209/21/1505/16/1209/21/1505/16/1212/10/1405/16/1208/28/1409/03/1409/03/1405/16/1205/16/1208/19/1005/16/12Oconee Nuclear StationLEP3Rvso03LOEP 3Revision 003 OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.7.15B 3.7.16B 3.7.17B 3.7.18B 3.7.19B 3.8.1B 3.8.2B 3.8.3B 3.8.4B 3.8.5B 3.8.6B 3.8.7B 3.8.8B 3.8.9B 3.9.1B 3.9.2B 3.9.3B 3.9.4B 3.9.5B 3.9.6B 3.9.7B 3.9.8B 3.10.1B 3.10.2o00000000000000o00000000000000000000000000000000000000000000000000000000010/24/0705/16/1204/12/0606/15/0606/25/1405/21/1504/07/1104/28/1512/18/0705/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1206/25/1411/05/1411/05/14Note: With the introduction of Fusion in June 2015, all controlled documents require athree-digit revision number. Thus, the revision numbers were set to "000" in the summerof 2015. As such, the revision dates for Revision 000 are based on the implementationdates for revisions in effect prior to this change.Oconee Nuclear StationLEP4Rvso03LOEP 4Revision 003 RCS Leakage Detection InstrumentationB 3.4.15B 3.4 REACTOR COOLANT SYSTEM (RCS)B 3.4.15 RCS Leakage Detection InstrumentationBASESBACKGROUND ONS Design Criteria (Ref. 1) requires means for detecting RCS LEAKAGE.Although ONS is not committed to Regulatory Guide 1.45, Revision 0(Ref. 2) describes acceptable methods for setting leakage detectionsystems.Leakage detection systems must have the capability to detect significantreactor coolant pressure boundary (RCPB) degradation as soon afteroccurrence as practical to minimize the potential for propagation to a grossfailure. Thus, an early indication or warning signal is necessary to permitproper evaluation of all unidentified LEAKAGE. In addition to meeting theOPERABILITY requirements, the monitors are typically set to provide themost sensitive response without causing an excessive number of spuriousalarms.The reactor coolant contains radioactivity that, when released to thecontainment, may be detected by radiation monitoring instrumentation.Radioactivity detection systems are included for monitoring both particulateand gaseous activities because of their sensitivities and rapid responses toRCS LEAKAGE.Other indications may be used to detect an increase in unidentifiedLEAKAGE; however, they are not required to be OPERABLE by this LCO.Air temperature and pressure monitoring methods may be used to inferunidentified LEAKAGE to the containment. Containment temperature andpressure fluctuate slightly during unit operation, but a rise above thenormally indicated range of values may indicate ROS LEAKAGE into thecontainment. The relevance of temperature and pressure measurementsis affected by containment free volume and, for temperature, detectorlocation. Signals from these instruments can be valuable in recognizingrapid and sizable leakage to the containment. Temperature and pressuremonitors are not required by this LCO.The above-mentioned LEAKAGE detection methods or systems differ insensitivity and response time. Some of these systems could serve as earlyalarm systems signaling the operators that closer examination of otherdetection systems is necessary to determine the extent of any correctiveaction that may be required.OCONEE UNITS 1, 2, & 3B34151ASSRVIO01B 3.4.15-1BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)APPLICABLE The need to evaluate the severity of an alarm or an indication is importantSAFETY ANALYSES to the operators, and the ability to compare and verify with indications fromother systems is necessary.The safety significance of RCS LEAKAGE varies widely depending on itssource, rate, and duration. Therefore, detecting and monitoring reactorcoolant LEAKAGE into the containment area are necessary. Separatingthe identified LEAKAGE from the unidentified LEAKAGE providesquantitative information to the operators, allowing them to take correctiveaction should a leak occur detrimental to the safety of the unit and thepublic.ROS leakage detection instrumentation satisfies Criterion 1 of10 CFR 50.36.LCO This LCO requires instruments of diverse monitoring principles to beOPERABLE to provide confidence that small amounts of unidentifiedLEAKAGE are detected in time to allow actions to place the unit in a safecondition when RCS LEAKAGE indicates possible RCPB degradation.The LCO requires two instruments of diverse monitoring principles (sumplevel indication and atmosphere radioactivity monitoring) to be OPERABLE.The containment sump is used to collect unidentified LEAKAGE. Thecontainment sump consists of the normal sump and the emergency sump.The LCO requirements apply to the total amount of unidentified LEAKAGEcollected in the normal sump. The monitor on the containment sumpdetects level and is instrumented to detect when there is leakage of 1 gpm.The identification of an increase in unidentified LEAKAGE will be delayedby the time required for the unidentified LEAKAGE to travel to thecontainment sump and it may take longer than one hour to detect a 1 gpmincrease in unidentified LEAKAGE, depending on the origin and magnitudeof the LEAKAGE. This sensitivity is acceptable for containment sumpmonitor OPERABILITY.The reactor coolant contains radioactivity that, when released to thecontainment, may be detected by the gaseous or particulate containmentatmosphere radioactivity monitor. Only one of the two detectors is requiredto be OPERABLE. Radioactivity detection systems are included formonitoring both particulate and gaseous activities because of theirsensitivities and rapid responses to RCS LEAKAGE, but have recognizedlimitations. Reactor coolant radioactivity levels will be low during initialreactor startup and for a few weeks thereafter, until activated corrosionproducts have been formed and fission products appear from fuel elementcladding contamination or cladding defects. If there are few fuel elementcladding defects and low levels of activation products, it may not beOCONEE UNITS 1, 2, & 3B34152ASSRVIO01B 3.4.15-2 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)LCO (continued)possible for the gaseous or particulate containment atmosphereradioactivity monitors to detect a 1 gpm increase within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> duringnormal operation. However, the gaseous or particulate containmentatmosphere radioactivity monitor is OPERABLE when it is capable ofdetecting a 1 gpm increase in unidentified LEAKAGE within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> givenan RCS activity equivalent to that assumed in the design calculations forthe monitors (Ref. 3).The LCO requirements are satisfied when instruments of diversemeasurement means are available. Thus, the containment normal sumplevel indication, in combination with a particulate (RIA-47) or gaseousradioactivity monitor (RIA-49), provides an acceptable minimum.APPLICABILITY Because of elevated RCS temperature and pressure in MODES 1, 2, 3,and 4, RCS leakage detection instrumentation is required to beOPERABLE.In MODE 5 or 6, the temperature is < 200°F and pressure is maintainedlow or at atmospheric pressure. Since the temperatures and pressures arefar lower than those for MODES 1, 2, 3, and 4, the likelihood of leakageand crack propagation is much smaller. Therefore, the requirements of thisLCO are not applicable in MODES 5 and 6.ACTIONS The Actions are modified by a Note indicating that the provisions ofLCO 3.0.4 do not apply. As a result, a MODE change is allowed when thenormal sump level indication and required radioactivity monitor areinoperable. This allowance is provided because other instrumentation isavailable to monitor RCS LEAKAGE.A.1 and A.2With the containment normal sump level indication inoperable, no otherform of sampling can provide the equivalent information.However, the containment atmosphere activity monitor will provideindications of changes in leakage. Together with the containmentatmosphere radioactivity monitor, the periodic surveillance for RCSinventory balance, SR 3.4.13.1, water inventory balance, must beperformed at an increased frequency of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to provide informationthat is adequate to detect leakage. A Note is added allowing that SR3.4.13.1 is not required to be performed until 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after steady stateoperation (stable RCS pressure, temperature, power level, pressurizer andmakeup tank levels, makeup and letdown, and RCP seal injection andreturn flows). The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowance provides sufficient time to collect andOCONEE UNITS 1, 2, & 3B34153ASSRVIO01B 3.4.15-3BASES REVISION 001 I RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)ACTIONS A.1 and A.2 (continued)process all necessary data after stable plant conditions are established.Restoration of the normal sump level indication to OPERABLE status isrequired to regain the function in a Completion Time of 30 days after levelindication failure. This time is acceptable considering the frequency andadequacy of the RCS water inventory balance required by RequiredAction A.1.B.1.1, B.1.2. and B.2With required gaseous or particulate containment atmosphere radioactivitymonitoring instrumentation channel inoperable, alternative action isrequired. Either grab samples of the containment atmosphere must betaken and analyzed or water inventory balances, in accordance withSR 3.4.13.1, must be performed to provide alternate periodic information.With a sample obtained and analyzed or a water inventory balanceperformed every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the reactor may be operated for up to 30 daysto allow restoration of the radioactivity monitor.The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> interval for SR 3.4.13.1 provides periodic information that isadequate to detect leakage. A Note is added allowing that SR 3.4.13.1 isnot required to be performed until 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after steady state operation(stable RCS pressure, temperature, power level, pressurizer and makeuptank levels, makeup and letdown, and RCP seal injection and return flows).The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowance provides sufficient time to collect and process allnecessary data after stable plant conditions are established. The 30 dayCompletion Time recognizes at least one other form of leak detection isavailable.C.1 and C.2With containment normal sump level indication inoperable, the only meansof detecting LEAKAGE is the required containment atmosphereradioactivity monitor. A Note clarifies that this Condition is applicable whenthe only OPERABLE monitor is the containment atmosphere gaseousradioactivity monitor. The containment atmosphere gaseous radioactivitymonitor typically cannot detect a 1 gpm leak within one hour when RCSactivity is low. In addition, this configuration does not provide the requireddiverse means of leakage detection. Indirect methods of monitoring RCSleakage must be implemented. Grab samples of the containmentatmosphere must be taken and analyzed to provide alternate periodicinformation. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> interval is sufficient to detect increasing RCSleakage. The Required Action provides 7 days to restore another RCSOCONEE UNITS 1, 2, & 3B34154ASSRVIO01B 3.4.15-4BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)ACTIONS C.1 and 0.2 (continued),leakage monitor to OPERABLE status to regain the intended leakagedetection diversity. The 7 day Completion Time ensures that the unit willnot be operated in a degraded configuration for a lengthy time period.D.1 and D.2If a Required Action of Condition A, B or C cannot be met within therequired Completion Time, the unit must be brought to a MODE in whichthe LCO does not apply. To achieve this status, the unit must be broughtto at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-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 />. Theallowed Completion Times are reasonable, based on operating experience,to reach the required unit conditions from full power conditions in an orderlymanner and without challenging unit systems.E.1If both required leakage detection instruments (normal sump levelindication and containment atmosphere radioactivity monitor) areinoperable, no automatic means of monitoring leakage are available, andimmediate plant shutdown in accordance with LCO 3.0.3 is required.SURVEILLANCE SR 3.4.15.1REQUIREMENTSSR 3.4.15.1 requires the performance of a CHANNEL CHECK of therequired containment atmosphere radioactivity monitor. The check givesreasonable confidence that each channel is operating properly. TheSurveillance Frequency is based on operating experience, equipmentreliability, and plant risk and is controlled under the SurveillanceFrequency Control Program.SR 3.4.15.2SR 3.4.15.2 requires the performance of a CHANNEL FUNCTIONAL TESTof the required containment atmosphere radioactivity monitor. The testensures that the monitor can perform its function in the desired manner.The test verifies the alarm setpoint and relative accuracy of the instrumentstring.OCONEE UNITS 1, 2, & 3B34155ASSRVIO01B 3.4.15-5BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)SURVEILLANCE SR 3.4.15.3 and SR 3.4.15.4REQUIREMENTS(continued) These SRs require the performance of a CHANNEL CALIBRATION foreach of the required RCS leakage detection instrumentation channels. Thecalibration verifies the accuracy of the instrument string, including theinstruments located inside containment. The Surveillance Frequency isbased on operating experience, equipment reliability, and plant risk and iscontrolled under the Surveillance Frequency Control Program.REFERENCES 1. UFSAR, Section 3.1.16, "Criterion 16 -Monitoring Reactor CoolantPressure Boundary (Category B)."2. Regulatory Guide 1.45, Revision 0, "Reactor Coolant PressureBoundary Leakage Detection System," May 1973.3. UFSAR, Section 5.2.3.10.5, "Leak Detection."OCONEE UNITS 1, 2, & 3B34156ASSRVIO01B 3.4.15-6BASES REVISION 001 I DUKE scotL.BsonENERGY°2 Vice PresidentLI 4L~~ IOconee Nuclear StationDuke EnergyONO1VP 1 7800 Rochester HwySeneca, SC 29672o: 864.873.3274f. 864.873, 4208ON S -201 5 -122 scott. Batson~duke -energy. comJanuary 20, 2016ATTN: Document Control DeskU.S. Nuclear Regulatory Commission11555 Rockville PikeRockville, Maryland 20852

Subject:

Duke Energy Carolinas, LLCOconee Nuclear StationDocket Numbers 50-269, 50-270, and 50-287Technical Specification (TS) Bases ChangePlease find attached changes to the Oconee Nuclear Station (ONS) TS Bases. These changeswere processed in accordance with the provisions of Technical Specification 5.5.15, "TechnicalSpecifications (TS) Bases Control Program."Amendments 394/396/395 were issued for Oconee to revise ONS TS 3.4.15, to define a newtime limit for restoring inoperable Reactor Coolant System (RCS) leakage detectioninstrumentation to operable status and to establish alternate methods of monitoring RCSleakage when one or more required monitors are inoperable in accordance with TS Task ForceTraveler (TSTF) 513, Revision 3, "Revise Pressurized-Water Reactor Operability Requirementsand actions for Reactor Coolant System Leakage Instrumentation."The associated TSTF-513 revision to TS Bases 3.4.15 was to clearly define the RCS leakagedetection instrumentation Operability requirements in the Limiting Condition for Operation (LCO) Bases and to eliminate discussion from the Bases that could be erroneously construed asOperability requirements. The Bases were also revised to reflect the changes to the Technicalspecifications and to more accurately reflect the existing Technical Specifications.Any questions regarding this information should be directed to Stephen C. Newman, ONSRegulatory Affairs Group, at (864) 873-4388.Sincerely,Vice PresidentOconee Nuclear StationAttachment \www.duke-energy.com U. S. Nuclear Regulatory CommissionJanuary 20, 2016Page 2cc: Ms. Catherine HaneyAdministrator, Region I1U.S. Nuclear Regulatory Commission, Region IIMarquis One Tower245 Peachtree Center Ave., NE, Suite 1200Atlanta, GA 30303-1257Mr. James R. Hall, Senior Project Manager (ONS)(By electronic mail only)U. S. Nuclear Regulatory CommissionOffice of Nuclear Reactor Regulation11555 Rockville PikeMail Stop O-8G9ARockville, MD 20852Mr. Jeffrey A. Whited, Project Manager(By electronic mail only)U. S. Nuclear Regulatory CommissionOffice of Nuclear Reactor Regulation11555 Rockville PikeMail Stop O-8B1ARockville, MD 20852Mr. Eddy CroweSenior Resident InspectorOconee Nuclear Station ONS-201 5-122January 20, 2016AttachmentRevised Oconee Nuclear Station TSB Manual PagesTSB List of Effective Pages (LOEPs), Rev. 003 LOEP 1-4TSB 3.4.15, RCS Leakage Detection Instrumentation 3.4.15-1 thru 6www.duke-energy.com OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERIMPLEMENTATION DATETOCB 2.1.1B 2.1.2B3.0B 3.1.1B 3.1.2B 3.1.3B 3.1.4B 3.1.5B 3.1.6B 3.1.7B 3.1.8B 3.2.1B3 3.2.2B 3.2.3B 3.3.1B 3.3.2B 3.3.3B 3.3.4B 3.3.5B 3.3.6B 3.3.7B 3.3.8B 3.3.9B 3.3.10B 3.3.11B 3.3.12o000000o000o00000000000000000000000000000000000001000000000000000000000000000o00000009/03/1405/31/1202/06/1410/20/1105/16/1205/16/1206/02/9907/23/1205/16/1207/23/1207/23/1205/16/1205/16/1205/16/1205/16/1209/30/1512/14/0412/10/1412/10/1412/10/1412/10/1412/10/1405/16/1205/16/1205/16/1205/16/1205/16/12Oconee Nuclear StationLEP1Rvso03LOEP 1Revision 003 OCONEE NUJCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.3.13B 3.3.14B 3.3.15B 3.3.16B 3.3.17B 3.3.18B 3.3.19B 3.3.20B 3.3.21B 3.3.22B 3.3.23B 3.3.24B 3.3.25B 3.3.26B 3.3.27B 3.3.28B 3.4.1B 3.4.2B 3.4.3B 3.4.4B 3.4.5B 3.4.6B 3.4.7B 3.4.8B 3.4.9B 3.4.10B 3.4.111B 3.4.12o000000000o000000000000000000000000000000000o00000000000000000000000000000o00001o00000005/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/1 6/1205/16/1209/26/0111/05/0311/05/0312/10/1405/16/1205/16/1212/16/9803/04/1505/16/1205/16/1205/16/1205/16/1205/16/1205/16/1209/21/1510/12/1206/13/14Oconee Nuclear StationLEP2Rvso03LOEP 2Revision 003 OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.4.13B 3.4.14B 3.4.15B 3.4.16B 3.5.1B 3.5.2B 3.5.3B 3.5.4B 3.6.1B 3.6.2B 3.6.3B 3.6.4B 3.6.5B 3.7.1B 3.7.2B 3.7.3B 3.7.4B 3.7.5B 3.7.6B 3.7.7B 3.7.8B 3.7.9B 3.7.10B 3.7.l0aB 3.7.11B 3.7.12B 3.7.13B 3.7.1400000100100000000100100000000000000000100100000100000100000000000000000000000000000005/16/1209/21/1511/24/1504/02/0705/16/1209/21/1509/21/1505/16/1210/20/1105/16/1205/16/1205/16/1209/21/1509/21/1511/13/1209/21/1505/16/1209/21/1505/16/1212/10/1405/16/1208/28/1409/03/1409/03/1405/16/1205/16/1208/19/1005/16/12Oconee Nuclear StationLEP3Rvso03LOEP 3Revision 003 OCONEE NUCLEAR STATIONTECHNICAL SPECIFICATIONS-BASES REVISED 11/24/15LIST OF EFFECTIVE PAGESSECTION/PAGESREVISION NUMBERBASES REVISION DATEB 3.7.15B 3.7.16B 3.7.17B 3.7.18B 3.7.19B 3.8.1B 3.8.2B 3.8.3B 3.8.4B 3.8.5B 3.8.6B 3.8.7B 3.8.8B 3.8.9B 3.9.1B 3.9.2B 3.9.3B 3.9.4B 3.9.5B 3.9.6B 3.9.7B 3.9.8B 3.10.1B 3.10.2o00000000000000o00000000000000000000000000000000000000000000000000000000010/24/0705/16/1204/12/0606/15/0606/25/1405/21/1504/07/1104/28/1512/18/0705/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1205/16/1206/25/1411/05/1411/05/14Note: With the introduction of Fusion in June 2015, all controlled documents require athree-digit revision number. Thus, the revision numbers were set to "000" in the summerof 2015. As such, the revision dates for Revision 000 are based on the implementationdates for revisions in effect prior to this change.Oconee Nuclear StationLEP4Rvso03LOEP 4Revision 003 RCS Leakage Detection InstrumentationB 3.4.15B 3.4 REACTOR COOLANT SYSTEM (RCS)B 3.4.15 RCS Leakage Detection InstrumentationBASESBACKGROUND ONS Design Criteria (Ref. 1) requires means for detecting RCS LEAKAGE.Although ONS is not committed to Regulatory Guide 1.45, Revision 0(Ref. 2) describes acceptable methods for setting leakage detectionsystems.Leakage detection systems must have the capability to detect significantreactor coolant pressure boundary (RCPB) degradation as soon afteroccurrence as practical to minimize the potential for propagation to a grossfailure. Thus, an early indication or warning signal is necessary to permitproper evaluation of all unidentified LEAKAGE. In addition to meeting theOPERABILITY requirements, the monitors are typically set to provide themost sensitive response without causing an excessive number of spuriousalarms.The reactor coolant contains radioactivity that, when released to thecontainment, may be detected by radiation monitoring instrumentation.Radioactivity detection systems are included for monitoring both particulateand gaseous activities because of their sensitivities and rapid responses toRCS LEAKAGE.Other indications may be used to detect an increase in unidentifiedLEAKAGE; however, they are not required to be OPERABLE by this LCO.Air temperature and pressure monitoring methods may be used to inferunidentified LEAKAGE to the containment. Containment temperature andpressure fluctuate slightly during unit operation, but a rise above thenormally indicated range of values may indicate ROS LEAKAGE into thecontainment. The relevance of temperature and pressure measurementsis affected by containment free volume and, for temperature, detectorlocation. Signals from these instruments can be valuable in recognizingrapid and sizable leakage to the containment. Temperature and pressuremonitors are not required by this LCO.The above-mentioned LEAKAGE detection methods or systems differ insensitivity and response time. Some of these systems could serve as earlyalarm systems signaling the operators that closer examination of otherdetection systems is necessary to determine the extent of any correctiveaction that may be required.OCONEE UNITS 1, 2, & 3B34151ASSRVIO01B 3.4.15-1BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)APPLICABLE The need to evaluate the severity of an alarm or an indication is importantSAFETY ANALYSES to the operators, and the ability to compare and verify with indications fromother systems is necessary.The safety significance of RCS LEAKAGE varies widely depending on itssource, rate, and duration. Therefore, detecting and monitoring reactorcoolant LEAKAGE into the containment area are necessary. Separatingthe identified LEAKAGE from the unidentified LEAKAGE providesquantitative information to the operators, allowing them to take correctiveaction should a leak occur detrimental to the safety of the unit and thepublic.ROS leakage detection instrumentation satisfies Criterion 1 of10 CFR 50.36.LCO This LCO requires instruments of diverse monitoring principles to beOPERABLE to provide confidence that small amounts of unidentifiedLEAKAGE are detected in time to allow actions to place the unit in a safecondition when RCS LEAKAGE indicates possible RCPB degradation.The LCO requires two instruments of diverse monitoring principles (sumplevel indication and atmosphere radioactivity monitoring) to be OPERABLE.The containment sump is used to collect unidentified LEAKAGE. Thecontainment sump consists of the normal sump and the emergency sump.The LCO requirements apply to the total amount of unidentified LEAKAGEcollected in the normal sump. The monitor on the containment sumpdetects level and is instrumented to detect when there is leakage of 1 gpm.The identification of an increase in unidentified LEAKAGE will be delayedby the time required for the unidentified LEAKAGE to travel to thecontainment sump and it may take longer than one hour to detect a 1 gpmincrease in unidentified LEAKAGE, depending on the origin and magnitudeof the LEAKAGE. This sensitivity is acceptable for containment sumpmonitor OPERABILITY.The reactor coolant contains radioactivity that, when released to thecontainment, may be detected by the gaseous or particulate containmentatmosphere radioactivity monitor. Only one of the two detectors is requiredto be OPERABLE. Radioactivity detection systems are included formonitoring both particulate and gaseous activities because of theirsensitivities and rapid responses to RCS LEAKAGE, but have recognizedlimitations. Reactor coolant radioactivity levels will be low during initialreactor startup and for a few weeks thereafter, until activated corrosionproducts have been formed and fission products appear from fuel elementcladding contamination or cladding defects. If there are few fuel elementcladding defects and low levels of activation products, it may not beOCONEE UNITS 1, 2, & 3B34152ASSRVIO01B 3.4.15-2 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)LCO (continued)possible for the gaseous or particulate containment atmosphereradioactivity monitors to detect a 1 gpm increase within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> duringnormal operation. However, the gaseous or particulate containmentatmosphere radioactivity monitor is OPERABLE when it is capable ofdetecting a 1 gpm increase in unidentified LEAKAGE within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> givenan RCS activity equivalent to that assumed in the design calculations forthe monitors (Ref. 3).The LCO requirements are satisfied when instruments of diversemeasurement means are available. Thus, the containment normal sumplevel indication, in combination with a particulate (RIA-47) or gaseousradioactivity monitor (RIA-49), provides an acceptable minimum.APPLICABILITY Because of elevated RCS temperature and pressure in MODES 1, 2, 3,and 4, RCS leakage detection instrumentation is required to beOPERABLE.In MODE 5 or 6, the temperature is < 200°F and pressure is maintainedlow or at atmospheric pressure. Since the temperatures and pressures arefar lower than those for MODES 1, 2, 3, and 4, the likelihood of leakageand crack propagation is much smaller. Therefore, the requirements of thisLCO are not applicable in MODES 5 and 6.ACTIONS The Actions are modified by a Note indicating that the provisions ofLCO 3.0.4 do not apply. As a result, a MODE change is allowed when thenormal sump level indication and required radioactivity monitor areinoperable. This allowance is provided because other instrumentation isavailable to monitor RCS LEAKAGE.A.1 and A.2With the containment normal sump level indication inoperable, no otherform of sampling can provide the equivalent information.However, the containment atmosphere activity monitor will provideindications of changes in leakage. Together with the containmentatmosphere radioactivity monitor, the periodic surveillance for RCSinventory balance, SR 3.4.13.1, water inventory balance, must beperformed at an increased frequency of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to provide informationthat is adequate to detect leakage. A Note is added allowing that SR3.4.13.1 is not required to be performed until 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after steady stateoperation (stable RCS pressure, temperature, power level, pressurizer andmakeup tank levels, makeup and letdown, and RCP seal injection andreturn flows). The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowance provides sufficient time to collect andOCONEE UNITS 1, 2, & 3B34153ASSRVIO01B 3.4.15-3BASES REVISION 001 I RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)ACTIONS A.1 and A.2 (continued)process all necessary data after stable plant conditions are established.Restoration of the normal sump level indication to OPERABLE status isrequired to regain the function in a Completion Time of 30 days after levelindication failure. This time is acceptable considering the frequency andadequacy of the RCS water inventory balance required by RequiredAction A.1.B.1.1, B.1.2. and B.2With required gaseous or particulate containment atmosphere radioactivitymonitoring instrumentation channel inoperable, alternative action isrequired. Either grab samples of the containment atmosphere must betaken and analyzed or water inventory balances, in accordance withSR 3.4.13.1, must be performed to provide alternate periodic information.With a sample obtained and analyzed or a water inventory balanceperformed every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the reactor may be operated for up to 30 daysto allow restoration of the radioactivity monitor.The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> interval for SR 3.4.13.1 provides periodic information that isadequate to detect leakage. A Note is added allowing that SR 3.4.13.1 isnot required to be performed until 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after steady state operation(stable RCS pressure, temperature, power level, pressurizer and makeuptank levels, makeup and letdown, and RCP seal injection and return flows).The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> allowance provides sufficient time to collect and process allnecessary data after stable plant conditions are established. The 30 dayCompletion Time recognizes at least one other form of leak detection isavailable.C.1 and C.2With containment normal sump level indication inoperable, the only meansof detecting LEAKAGE is the required containment atmosphereradioactivity monitor. A Note clarifies that this Condition is applicable whenthe only OPERABLE monitor is the containment atmosphere gaseousradioactivity monitor. The containment atmosphere gaseous radioactivitymonitor typically cannot detect a 1 gpm leak within one hour when RCSactivity is low. In addition, this configuration does not provide the requireddiverse means of leakage detection. Indirect methods of monitoring RCSleakage must be implemented. Grab samples of the containmentatmosphere must be taken and analyzed to provide alternate periodicinformation. The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> interval is sufficient to detect increasing RCSleakage. The Required Action provides 7 days to restore another RCSOCONEE UNITS 1, 2, & 3B34154ASSRVIO01B 3.4.15-4BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)ACTIONS C.1 and 0.2 (continued),leakage monitor to OPERABLE status to regain the intended leakagedetection diversity. The 7 day Completion Time ensures that the unit willnot be operated in a degraded configuration for a lengthy time period.D.1 and D.2If a Required Action of Condition A, B or C cannot be met within therequired Completion Time, the unit must be brought to a MODE in whichthe LCO does not apply. To achieve this status, the unit must be broughtto at least MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-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 />. Theallowed Completion Times are reasonable, based on operating experience,to reach the required unit conditions from full power conditions in an orderlymanner and without challenging unit systems.E.1If both required leakage detection instruments (normal sump levelindication and containment atmosphere radioactivity monitor) areinoperable, no automatic means of monitoring leakage are available, andimmediate plant shutdown in accordance with LCO 3.0.3 is required.SURVEILLANCE SR 3.4.15.1REQUIREMENTSSR 3.4.15.1 requires the performance of a CHANNEL CHECK of therequired containment atmosphere radioactivity monitor. The check givesreasonable confidence that each channel is operating properly. TheSurveillance Frequency is based on operating experience, equipmentreliability, and plant risk and is controlled under the SurveillanceFrequency Control Program.SR 3.4.15.2SR 3.4.15.2 requires the performance of a CHANNEL FUNCTIONAL TESTof the required containment atmosphere radioactivity monitor. The testensures that the monitor can perform its function in the desired manner.The test verifies the alarm setpoint and relative accuracy of the instrumentstring.OCONEE UNITS 1, 2, & 3B34155ASSRVIO01B 3.4.15-5BASES REVISION 001 RCS Leakage Detection InstrumentationB 3.4.15BASES (continued)SURVEILLANCE SR 3.4.15.3 and SR 3.4.15.4REQUIREMENTS(continued) These SRs require the performance of a CHANNEL CALIBRATION foreach of the required RCS leakage detection instrumentation channels. Thecalibration verifies the accuracy of the instrument string, including theinstruments located inside containment. The Surveillance Frequency isbased on operating experience, equipment reliability, and plant risk and iscontrolled under the Surveillance Frequency Control Program.REFERENCES 1. UFSAR, Section 3.1.16, "Criterion 16 -Monitoring Reactor CoolantPressure Boundary (Category B)."2. Regulatory Guide 1.45, Revision 0, "Reactor Coolant PressureBoundary Leakage Detection System," May 1973.3. UFSAR, Section 5.2.3.10.5, "Leak Detection."OCONEE UNITS 1, 2, & 3B34156ASSRVIO01B 3.4.15-6BASES REVISION 001 I