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| {{#Wiki_filter:CATEGORYREGULATINFORMATION DISTRIBUTIO YSTEM(RIDS)ACCESSION NBR:9708250397 DOC.DATE: | | {{#Wiki_filter:CATEGORY REGULAT INFORMATION DISTRIBUTIO YSTEM (RIDS)ACCESSION NBR:9708250397 DOC.DATE: 97/08/15 NOTARIZED: |
| 97/08/15NOTARIZED: | | NO DOCKET I FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.NAME AUTHOR AFFILIAT:ON PFITRER,B. |
| NODOCKETIFACIL:50-397 WPPSSNuclearProject,Unit2,Washington PublicPowe05000397AUTH.NAMEAUTHORAFFILIAT:ON PFITRER,B.
| | Washington Public Power Supply System BEMIS,P.R. |
| Washington PublicPowerSupplySystemBEMIS,P.R. | | Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION |
| Washington PublicPowerSupplySystemRECIP.NAME RECIPIENT AFFILIATION | |
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| ==SUBJECT:== | | ==SUBJECT:== |
| LER97-008-00:on 970716,wire sealusedtolockcontainment instrument airpressurecontrolvalve,CIA-PCV-2B,found notintact.Causeofmisadjustment ofCIA-PCV-2B unknown.Eventwil'ecommunicar,ed toplaneemployees.W/970815 itr.DZSTRIBDTZON CODE:ZE22TCOPIESRECEIVED:LTR 1ENCL1SIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.NOTES:RECIPIENT IDCODE/NAME PD4-2PDINTERNAL:
| | LER 97-008-00:on 970716,wire seal used to lock containment instrument air pressure control valve,CIA-PCV-2B,found not intact.Cause of misadjustment of CIA-PCV-2B unknown.Event wil'e communicar,ed to plane employees.W/970815 itr.DZSTRIBDTZON CODE: ZE22T COPIES RECEIVED:LTR 1 ENCL 1 SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.NOTES: RECIPIENT ID CODE/NAME PD4-2 PD INTERNAL: ACRS AEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HICB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL: L ST LOBBY WARD NOAC POOREEW.NRC PDR COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1'1 1 1 1 1 RECIPIENT ID CODE/NAME COLBURN,T AEOD PD B FIGE CENTE EEI B NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN4 FILE 01 LITCO BRYCE,J H NOAC QUEENER,DS NUDOCS FULL TXT COPIES LTTR ENCL 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D 0 N NOTE TO ALL"RIDS" RECIPIENTS: |
| ACRSAEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HICB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL:
| | PLEASE HELP US TO REDUCE WASTE.TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL 25 WASHIi JGTON PUBLIC POWER SUPPLY SYSTEM'O.13ox 968~ltichlond, tt'isshiwgton 99352-0968 August 15, 1997 G02-97-157 Docket No.50-397 Document Control Desk U.S.Nuclear Regulatory Commission Washington, D.C.20555 Gentlemen: |
| LSTLOBBYWARDNOACPOOREEW.NRCPDRCOPIESLTTRENCL1111111111111111111'11111RECIPIENT IDCODE/NAME COLBURN,T AEODPDBFIGECENTEEEIBNRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN4FILE01LITCOBRYCE,JHNOACQUEENER,DS NUDOCSFULLTXTCOPIESLTTRENCL112211111111111111111111D0NNOTETOALL"RIDS"RECIPIENTS:
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| PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTRIBUTION LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083FULLTEXTCONVERSION REQUIREDTOTALNUMBEROFCOPIESREQUIRED:
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| LTTR25ENCL25 WASHIiJGTONPUBLICPOWERSUPPLYSYSTEM'O.13ox968~ltichlond, tt'isshiwgton 99352-0968 August15,1997G02-97-157 DocketNo.50-397DocumentControlDeskU.S.NuclearRegulatory Commission Washington, D.C.20555Gentlemen:
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| ==Subject:== | | ==Subject:== |
| NUCLIARPLANTWNP-2,OPERATING LICENSENPF-21,LICENSEEE&~2lTREPORTNO.97-008-00 Transmitted herewithisLicenseeEventReportNo.97-008-00 forWNP-2.Thisreportissubmitted pursuantto10CFR50.73anddiscusses theitemsofreportability, corrective action-taken,andactiontoprecluderecurrence.
| | NUCLIAR PLANT WNP-2, OPERATING LICENSE NPF-21, LICENSEE E&~2lT REPORT NO.97-008-00 Transmitted herewith is Licensee Event Report No.97-008-00 for WNP-2.This report is submitted pursuant to 10 CFR 50.73 and discusses the items of reportability, corrective action-taken, and action to preclude recurrence. |
| Shouldyouhaveanyquestions ordesireadditional information regarding thismatter,pleasecallmeorMr.PaulInserraat(509)377-4147.
| | Should you have any questions or desire additional information regarding this matter, please call me or Mr.Paul Inserra at (509)377-4147.R tfully,~~s Vice President, Nuclear Operations Mail Drop PE23 Enclosure cc: EW Merschoff, NRC RIV KE Perkins, Jr., NRC RIV, WCFO TG Colburn, NRR PD Robinson, Winston&Strawn NRC Sr.Resident Inspector, MD927N (2)INPO Records Center-Atlanta, GA DL Williams, BPA, MD399 9708250397 9708i5 PDR ADOCK 0500OS'P7 S PDR llllllllllllllllllllllllllillllllllll LICE SEE EVENT REPORT LER FACILITY NAME{1)Washin ton Nuclear Plant-Unit 2 DOCKET NUMBER (2)50-397 PAGE (3)1OF3 TITLE{4)INOPERABILITY OF FOUR AUTOMATIC DEPRESSURIZATION SYSTEM VALVES DUE TO CIA-PCV-2B PRESSURE SETPOINT DISCOVERED SET LESS THAN REQUIRED EVENT DATE{5)OAY 07 16 97 97 LER NUMBER{61 SEOUENRAL NUMBER REPORT DATE{71 REV.NUMBER 00 08 OAY YEAR FACILffY NAME 15 97 F AC)L)TY NAME N/A DOCKET NUMBER DOCKET NUMBER 05000 OTHER FACILITIES INVOLVED IBI OPERATING MODE THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OP 10 CPR 5: (Check one or motel Ill)90%20.402{b)20.405(a)(1) |
| Rtfully,~~sVicePresident, NuclearOperations MailDropPE23Enclosure cc:EWMerschoff, NRCRIVKEPerkins,Jr.,NRCRIV,WCFOTGColburn,NRRPDRobinson, Winston&StrawnNRCSr.ResidentInspector, MD927N(2)INPORecordsCenter-Atlanta,GADLWilliams, BPA,MD3999708250397 9708i5PDRADOCK0500OS'P7 SPDRllllllllllllllllllllllllllillllllllll LICESEEEVENTREPORTLERFACILITYNAME{1)WashintonNuclearPlant-Unit2DOCKETNUMBER(2)50-397PAGE(3)1OF3TITLE{4)INOPERABILITY OFFOURAUTOMATIC DEPRESSURIZATION SYSTEMVALVESDUETOCIA-PCV-2B PRESSURESETPOINTDISCOVERED SETLESSTHANREQUIREDEVENTDATE{5)OAY07169797LERNUMBER{61SEOUENRAL NUMBERREPORTDATE{71REV.NUMBER0008OAYYEARFACILffYNAME1597FAC)L)TYNAMEN/ADOCKETNUMBERDOCKETNUMBER05000OTHERFACILITIES INVOLVEDIBIOPERATING MODETHISREPORTISSUBMITTED PURSUANTTOTHEREQUIREMENTS OP10CPR5:(CheckoneormotelIll)90%20.402{b)20.405(a)(1)
| | Q 20.405(a)(1)(ii)20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v) |
| Q20.405(a)
| | X 20.405(c)$0.36(c)(1)$036(c)(2)50 73(a){2){))50.73(a)(2)(ii) 50.73(a)(2)(iii)50.73{a)(2) |
| (1)(ii)20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v) | | {iv)50.73(a)(2)(v) 50.73(a)(2)(vii)50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B)50.73(a)(2)(x) 73.71{b).73.71(c)OTHER NAME Bill Pfitzer, Licensing Engineer LICENSEE CONTACT FOR THIS LER{12)TELEPHONE NUMBER{Include Area Code)509-377-2419 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)CAUSE SYSTEM COMPONENT M))I)FAcTT)RER REPORTABLE TO NPROS CAUS F SYSTEM COMPONENT MANUFACTURER REPORTABLE TO NPRDS SUPPLEMENTAL REPORT EXPECTED (14)YES corn Ieted EXPECTED SUBMISSION DAT NO EXPECTED MONTH DAY YEAR ABSTRACT: On July 16, 1997, with the plant operating at 90%power, the wire seal used to lock containment instrument air pressure control valve, CIA-PCV-2B, was found not intact.This valve controls backup nitrogen pressure (actuating medium)to the four subsystem B automatic depressurization system (ADS)valves.Subsequent maintenance troubleshooting activities revealed the setpoint for CIA-PCV-2B was set to approximately 63 psig, well below the intended setpoint of 180+/-2 psig.Security and Operations have conducted an investigation into this event.It was determined that this valve was set to its required setpoint during CIA system startup following system maintenance during the last outage.No clear evidence of tampering was found since that time, and the cause of the misadjustment of CIA-PCV-2B is unknown.As a corrective action, the setpoint for CIA-PCV-2B has been readjusted to 180+/-2 psig and a new locking wire seal was installed. |
| X20.405(c)
| | This condition is reported per 10 CFR 50.73(a)(2)(ii) as a condition prohibited by Technical Specifications. |
| $0.36(c)(1)$036(c)(2)5073(a){2){))50.73(a)(2)(ii) 50.73(a)(2) | | Due to the redundant design features of ADS, both the long term and short term functions of ADS would have been accomplished during the period when CIA-PCV-2B was misadjusted. |
| (iii)50.73{a)(2) | | Therefore, the safety significance of this event is minimal. |
| {iv)50.73(a)(2)(v) 50.73(a)(2)(vii)50.73(a)(2)(viii)(A) 50.73(a)(2)(viii) | | fACILITY NAME Il)LICENSEE EVENT REPORT (LER)TEXT CONTINUATION DOCKET NUMBER (2)YEAR LER NUMBER I6)SEQUENTIAL NUMBER REVr S 10M WNBSA PAGE (3)Washington Nuclear Plant-Unit 2 50-397 97 008 00 2 OF 3 TEXT (If more space is required, Use additional copies of NRC Form 366A)(17)Event De cri tion On July 16, 1997, with the plant operating at 90%power, the wire seal used to lock containment instrument air[LD]pressure control valve[PCV], CIA-PCV-2B, was found not intact.This valve controls backup nitrogen pressure (actuating medium)to the four B subsystem ADS valves.Subsequent maintenance troubleshooting activities revealed the setpoint for CIA-PCV-2B was set to approximately 63 psig, well below the intended setpoint of 180+/-2 psig.This regulating valve was set to its required setpoint during CIA system startup following system maintenance during the last outage.Reactor startup from the last refueling outage occurred on July 4, 1997.CIA nitrogen bottles supply the backup actuating medium to the ADS valves via CIA-PCV-2B. |
| (B)50.73(a)(2)(x) 73.71{b).73.71(c)OTHERNAMEBillPfitzer,Licensing EngineerLICENSEECONTACTFORTHISLER{12)TELEPHONE NUMBER{IncludeAreaCode)509-377-2419 COMPLETEONELINEFOREACHCOMPONENT FAILUREDESCRIBED INTHISREPORT(13)CAUSESYSTEMCOMPONENT M))I)FAcTT)RER REPORTABLE TONPROSCAUSFSYSTEMCOMPONENT MANUFACTURER REPORTABLE TONPRDSSUPPLEMENTAL REPORTEXPECTED(14)YEScornIetedEXPECTEDSUBMISSION DATNOEXPECTEDMONTHDAYYEARABSTRACT: | | Throughout the event, including the maintenance activities to reset CIA-PCV-2B, all seven ADS valves were supplied by the containment nitrogen system (CN)[LK]which supplies the normal actuating medium to the ADS valves.Immedia e orrective Action On July 18, 1997, the CIA supply to ADS subsystem B was isolated in preparation for verifying the setpoint of CIA-PCV-2B, and accordingly entry was made into Technical Specification Action Statement (TSAS)3.5.1.G.The setpoint for CIA-PCV-2B was found to be 63 psig and was readjusted to 180+/-2 psig and a new locking wire seal was installed. |
| OnJuly16,1997,withtheplantoperating at90%power,thewiresealusedtolockcontainment instrument airpressurecontrolvalve,CIA-PCV-2B, wasfoundnotintact.Thisvalvecontrolsbackupnitrogenpressure(actuating medium)tothefoursubsystem Bautomatic depressurization system(ADS)valves.Subsequent maintenance troubleshooting activities revealedthesetpointforCIA-PCV-2B wassettoapproximately 63psig,wellbelowtheintendedsetpointof180+/-2psig.SecurityandOperations haveconducted aninvestigation intothisevent.Itwasdetermined thatthisvalvewassettoitsrequiredsetpointduringCIAsystemstartupfollowing systemmaintenance duringthelastoutage.Noclearevidenceoftampering wasfoundsincethattime,andthecauseofthemisadjustment ofCIA-PCV-2B isunknown.Asacorrective action,thesetpointforCIA-PCV-2B hasbeenreadjusted to180+/-2psigandanewlockingwiresealwasinstalled.
| | After restoration of the CIA supply, TSAS 3.5.1.G was exited.F r her Evaluati n The normal ADS valve actuating medium is supplied by the CN system.If CN pressure to the ADS valves falls to less than 160 psig, the CN supply is automatically isolated, and CIA-PCV-2A and-2B function to regulate backup nitrogen to ADS subsystems A and B from pressurized bottles in the CIA system.Of these two supplies, the CIA bottles (the backup supply)is a safety related system, and the CN system (the normal supply)is not safety related.Thus, the CIA supply must be operable to support ADS operability. |
| Thiscondition isreportedper10CFR50.73(a)(2)(ii) asacondition prohibited byTechnical Specifications.
| | Therefore, this event rendered the four ADS valves in the B subsystem inoperable. |
| Duetotheredundant designfeaturesofADS,boththelongtermandshorttermfunctions ofADSwouldhavebeenaccomplished duringtheperiodwhenCIA-PCV-2B wasmisadjusted.
| | Immediately after discovery of the broken wire seal it was not recognized that the valve setpoint may have been changed, or that ADS operability had been affected.The setpoint of CIA-PCV-2B was not verified until approximately two days after discovery of the broken wire seal when necessary work documents were developed and approved.For purpose of this report, it is assumed that CIA-PCV-2B was misadjusted from the time of discovery of the broken wire seal to the time the valve was readjusted to the required value of 180 psig, a period of approximately 52 hours.TSAS 3.5.1.G requires the plant to be placed in Mode 3 within 12 hours when two or more ADS valves are inoperable. |
| Therefore, thesafetysignificance ofthiseventisminimal. | | Therefore, this condition is reported per 10 CFR 50.73(a)(2)(ii) as a condition prohibited by Technical Specifications. |
| fACILITYNAMEIl)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION DOCKETNUMBER(2)YEARLERNUMBERI6)SEQUENTIAL NUMBERREVrS10MWNBSAPAGE(3)Washington NuclearPlant-Unit250-39797008002OF3TEXT(Ifmorespaceisrequired, Useadditional copiesofNRCForm366A)(17)EventDecritionOnJuly16,1997,withtheplantoperating at90%power,thewiresealusedtolockcontainment instrument air[LD]pressurecontrolvalve[PCV],CIA-PCV-2B, wasfoundnotintact.Thisvalvecontrolsbackupnitrogenpressure(actuating medium)tothefourBsubsystem ADSvalves.Subsequent maintenance troubleshooting activities revealedthesetpointforCIA-PCV-2B wassettoapproximately 63psig,wellbelowtheintendedsetpointof180+/-2psig.Thisregulating valvewassettoitsrequiredsetpointduringCIAsystemstartupfollowing systemmaintenance duringthelastoutage.Reactorstartupfromthelastrefueling outageoccurredonJuly4,1997.CIAnitrogenbottlessupplythebackupactuating mediumtotheADSvalvesviaCIA-PCV-2B.
| |
| Throughout theevent,including themaintenance activities toresetCIA-PCV-2B, allsevenADSvalvesweresuppliedbythecontainment nitrogensystem(CN)[LK]whichsuppliesthenormalactuating mediumtotheADSvalves.Immediaeorrective ActionOnJuly18,1997,theCIAsupplytoADSsubsystem Bwasisolatedinpreparation forverifying thesetpointofCIA-PCV-2B, andaccordingly entrywasmadeintoTechnical Specification ActionStatement (TSAS)3.5.1.G.ThesetpointforCIA-PCV-2B wasfoundtobe63psigandwasreadjusted to180+/-2psigandanewlockingwiresealwasinstalled. | |
| Afterrestoration oftheCIAsupply,TSAS3.5.1.Gwasexited.FrherEvaluatinThenormalADSvalveactuating mediumissuppliedbytheCNsystem.IfCNpressuretotheADSvalvesfallstolessthan160psig,theCNsupplyisautomatically
| |
| : isolated, andCIA-PCV-2A and-2BfunctiontoregulatebackupnitrogentoADSsubsystems AandBfrompressurized bottlesintheCIAsystem.Ofthesetwosupplies, theCIAbottles(thebackupsupply)isasafetyrelatedsystem,andtheCNsystem(thenormalsupply)isnotsafetyrelated.Thus,theCIAsupplymustbeoperabletosupportADSoperability.
| |
| Therefore, thiseventrenderedthefourADSvalvesintheBsubsystem inoperable. | |
| Immediately afterdiscovery ofthebrokenwiresealitwasnotrecognized thatthevalvesetpointmayhavebeenchanged,orthatADSoperability hadbeenaffected. | |
| ThesetpointofCIA-PCV-2B wasnotverifieduntilapproximately twodaysafterdiscovery ofthebrokenwiresealwhennecessary workdocuments weredeveloped andapproved.
| |
| Forpurposeofthisreport,itisassumedthatCIA-PCV-2B wasmisadjusted fromthetimeofdiscovery ofthebrokenwiresealtothetimethevalvewasreadjusted totherequiredvalueof180psig,aperiodofapproximately 52hours.TSAS3.5.1.GrequirestheplanttobeplacedinMode3within12hourswhentwoormoreADSvalvesareinoperable.
| |
| Therefore, thiscondition isreportedper10CFR50.73(a)(2)(ii) asacondition prohibited byTechnical Specifications. | |
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| fACILITYNAMEII)LICENSEEEVENTREPORT(LER)TEXTCONTINUATION DOCKETNUMBERI2)YEARLERNUMBERI6)SEQUENTIAL NUNBERAsslISINt NUttBERPAGEI3)Washington NuclearPlant-Unit250-39797"003OF3TEXT(Ifmorespaceisrequired, useadditional copiesofNRCForm366A)(17)~RootCausSecurityandOperations haveconducted aninvestigation intothisevent.Itwasrevealedthatthisregulating valvewassettoitsrequiredsetpointduringCIAsystemstartupduringthelastoutage.Noclearevidenceoftampering sincethattimewasfound,andthecauseofthemisadjustment ofCIA-PCV-2B isunknown.FrtherrreciveAcionInformation concerning thiseventwillbecommunicated toplantemployees.
| | fACILITY NAME II)LICENSEE EVENT REPORT (LER)TEXT CONTINUATION DOCKET NUMBER I2)YEAR LER NUMBER I6)SEQUENTIAL NUNBER AsslISINt NUttBER PAGE I 3)Washington Nuclear Plant-Unit 2 50-397 97"00 3 OF 3 TEXT (If more space is required, use additional copies of NRC Form 366A)(17)~Root Caus Security and Operations have conducted an investigation into this event.It was revealed that this regulating valve was set to its required setpoint during CIA system startup during the last outage.No clear evidence of tampering since that time was found, and the cause of the misadjustment of CIA-PCV-2B is unknown.F rther rrec ive Ac ion Information concerning this event will be communicated to plant employees. |
| Guidancewillbeaddedtoplantprocedure(s) tospecifythatifthereisreasontosuspectaplantcomponent isimproperly configured, promptcorrective actionwillbetakentoverifytheproperconfiguration.
| | Guidance will be added to plant procedure(s) to specify that if there is reason to suspect a plant component is improperly configured, prompt corrective action will be taken to verify the proper configuration. |
| AemnffetnsuencesTheshorttermfunctionoftheADSsystemistoprovidepost-LOCA vesseldepressurization capability topermituseofthelowpressureemergency corecoolingsystem(ECCS)spray/injection subsystems forvesselinjection.
| | A e m n f fet ns uences The short term function of the ADS system is to provide post-LOCA vessel depressurization capability to permit use of the low pressure emergency core cooling system (ECCS)spray/injection subsystems for vessel injection. |
| Thisfunctionwasunaffected byCIA-PCV-2B beingmisadjusted becauseallsevenADSvalvesweresuppliedthroughout theeventbythenormalnitrogensupplyprovidedbytheCNsystem,andeachADSvalveisprovidedwithapressureaccumulator which,ifthenitrogensupplyweretofail,wouldsupporttheshorttermfunctionofADSbyproviding pressureforapproximately fivevalveoperations.
| | This function was unaffected by CIA-PCV-2B being misadjusted because all seven ADS valves were supplied throughout the event by the normal nitrogen supply provided by the CN system, and each ADS valve is provided with a pressure accumulator which, if the nitrogen supply were to fail, would support the short term function of ADS by providing pressure for approximately five valve operations. |
| ThelongtermfunctionoftheADSsystemistosupplyaflowpathforalternate shutdowncooling.ThiswouldJsobesupported bythenormalCNsupplytotheADSvalves.But,iftheCNsupplyweretofail,nitrogenleakagefromtheADSvalveactuators andassociated pipingmaybesuchthatpressureintheaccumulators wouldbeinsufficient toholdtheADSvalvesopenforthelongperiodsnecessary tosupportthealternate shutdowncoolingflowpath.Inthecaseofthisevent,theresultofaCNfailurewouldbethatthefourBsystemADSvalveswouldbeunavailable forthelongtermfunctionofalternate shutdowncooling,andonlythethreeAsubsystem ADSvalveswouldbeavailable toprovideanalternate shutdowncoolingflowpath.However,analysisshowsthatonlytwoADSvalvesarerequiredtoprovideaflowpathforalternate shutdowncooling.Therefore, thelongtermfunctionofADScouldbeaccomplished withthethreevalvesintheAsubsystem ofADS.Perthisanalysis, boththelongtermandshorttermfunctions ofADSwouldhavebeenaccomplished duringtheperiodwhenCIA-PCV-2B wassetto63psig.Therefore, thesafetysignificance ofthiseventisminimal.SimilarEventNone
| | The long term function of the ADS system is to supply a flow path for alternate shutdown cooling.This would Jso be supported by the normal CN supply to the ADS valves.But, if the CN supply were to fail, nitrogen leakage from the ADS valve actuators and associated piping may be such that pressure in the accumulators would be insufficient to hold the ADS valves open for the long periods necessary to support the alternate shutdown cooling flow path.In the case of this event, the result of a CN failure would be that the four B system ADS valves would be unavailable for the long term function of alternate shutdown cooling, and only the three A subsystem ADS valves would be available to provide an alternate shutdown cooling flow path.However, analysis shows that only two ADS valves are required to provide a flow path for alternate shutdown cooling.Therefore, the long term function of ADS could be accomplished with the three valves in the A subsystem of ADS.Per this analysis, both the long term and short term functions of ADS would have been accomplished during the period when CIA-PCV-2B was set to 63 psig.Therefore, the safety significance of this event is minimal.Similar Event None |
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Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML17292B7421999-07-20020 July 1999
LER 99-001-00:on 990628,ESF Signal Closed All Eight MSIVs While Plant Was Shutdown.Caused by Failure of Relay RPS-RLY-K10D.Subject Relay Was Replaced & Tested on 990630. with 990720 Ltr
ML17292B4451998-10-27027 October 1998
LER 98-012-01:on 980715,failure to Comply with Requirements of TS SR 3.8.4.7 Was Noted.Caused by Inadequate Work Practices.Training Session Was Held with Personnel.With 981027 Ltr
ML17284A7561998-09-0303 September 1998
LER 98-013-00:on 980805,ESF Actuations Were Noted Due to Deenergization of Vital Electrical Bus SM-8.Caused by Inadequate Direction in Troubleshooting Plan.Will Conduct Training for Engineering Personnel.With 980903 Ltr
ML17284A7571998-09-0202 September 1998
LER 98-014-00:on 980807,completion of TS 3.8.1.F Required Shutdown Due to Inoperability of EDG-2 Was Noted.Caused by Degraded Voltage Regulator for DG-2.Replaced Voltage Regulator & Associated Scrs.With 980902 Ltr
ML17284A7551998-09-0202 September 1998
LER 98-015-00:on 980808,discovered Reactor Coolant Pressure Boundary Leak During Shutdown Conditions.Caused by Leakage from Socket Weld (Fwb 63) on Elbow Connection.Failed Piping Connection Was Replaced.With 980902 Ltr
ML17284A7311998-08-17017 August 1998
LER 98-012-00:on 980716,determined That 24-month SR 3.8.4.7 Had Not Been Fulfilled within Specified Frequency.Caused by Inadequate Work Practices.License Requested & Received Enforcement Discretion Re Battery Svc test.W/980817 Ltr
ML17284A7121998-07-23023 July 1998
LER 98-006-01:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of 10CFR50,App R Calculations for High Impedance Faults.Caused by Inadequate Work Practices.Implemented Procedural Changes
ML17284A6951998-07-17017 July 1998
LER 98-011-00:on 980617,ECCS Pump Room Flooding Was Noted Due to FP Sys Pipe Break.Caused by Inadequate Design of FP Sys.Detailed Review of FP Sys Design Was Conducted. W/980717 Ltr
ML17284A6961998-07-15015 July 1998
LER 98-010-00:on 980615,TS Required Shutdown Due to Inoperability of TIP Sys Isolation Valve Was Noted.Caused by Improper Installation of TIP Tubing.Reattached Affected Tubing & Inspected Other TIP tubing.W/980715 Ltr
ML17284A6731998-07-0101 July 1998
LER 98-009-00:on 980606,nuclear Steam Supply Shutoff Sys Group 3 & 4 Isolations During Testing Was Noted.Caused by Procedural Deficiency.Counseled Individuals Involved in preparation.W/980701 Ltr
ML17284A6651998-06-24024 June 1998
LER 98-007-00:on 980530,inadvertent Full Scram & Division 1 ECCS Injection Was Noted.Caused by Failure to Meet Mgt Work Practice Expectation When Encountering Deficient Procedure. Incident Review Board Convened to Review event.W/980624 Ltr
ML17284A6641998-06-24024 June 1998
LER 98-008-00:on 980531,inadvertent Full Scram During RPV Leak Testing in Mode 4 Was Noted.Caused by Change in Mgt Techniques.Revised Procedures to Take Into Account Addl Water Head in Pressure Sensing lines.W/980624 Ltr
ML17284A6631998-06-19019 June 1998
LER 98-006-00:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of App R Calculations for High Impedance Fault Analysis.Caused Indeterminate. Implemented Procedural Changes Involving Operator Action
ML17284A6551998-06-0404 June 1998
LER 98-005-00:on 980506,potential for Failure of RHR Sys Valve to Close on Isolation Signal Was Noted.Caused by Design Deficiency.Caution Tag Was Placed on RHR-V-40 Control Switch to Inform Plant Operators of limitation.W/980604 Ltr
ML17284A6421998-06-0101 June 1998
LER 98-004-00:on 980502,determined That Primary Containment Penetration Overcurrent Protection Does Not Meet Reg Guide 1.63 Requirements.Caused by Inadequate Design Changes. Installed Addl Fuse in RHR-MO-9 circuit.W/980601 Ltr
ML17292B3281998-04-0909 April 1998
LER 98-002-00:on 980311,reactor Scram & Plant Transient Occurred,Due to Failed Closed Main Steam Isolation Valve. Caused by Loss of Pneumatic Actuating Supply Pressure. Problem Evaluation Request Written for Failure of MS-V-22D
ML17292B3291998-04-0909 April 1998
LER 98-003-00:on 980311,WNP-2 Experienced SCRAM Signal as Result of Low Rpv.Caused by Less than post-SCRAM Operational Strategy for Resetting SCRAM Signal in Conditions.Changes in post-SCRAM Operational Strategy implemented.W/980409 Ltr
ML17292B2661998-03-0404 March 1998
LER 98-001-00:on 980203,automatic Start of HPCS EDG Was Noted.Caused by Operator Error.Operations Crew Stabilized Plant at Approximately 75% Reactor Power & Investigation of Event Was initiated.W/980304 Ltr
ML17292B1111997-11-10010 November 1997
LER 97-011-00:on 971010,HPCS Battery Charger Failed.Caused by Failure of a Phase Firing Control Circuit Board Due to Aging During 7 Yrs of Use.Hpcs Sys Was Immediately Declared inoperable.W/971110 Ltr
ML17292B1151997-11-0707 November 1997
LER 97-010-00:on 970906,discovered That TS SR 3.4.5.1 for Identified Portion of RCS Total Leakage Would Not Be Able to Perform within Time Limits of SR 3.0.2.Caused by Inadequate Methods.Method of Meeting SR 3.4.5.1 Established
ML17292B0641997-09-24024 September 1997
LER 97-004-01:on 970327,plant Operators Manually Scrammed Reactor as Required by TS Due to Indication of Entry Into Region a of power-to-flow Map.Caused by Inadequate Attention to Detail.Established Event Evaluation teams.W/970924 Ltr
ML17292B0241997-08-18018 August 1997
LER 97-009-00:on 970717,discovered Error in Recently Performed Inservice Testing procedure,OSP-TIP/IST-R701. Caused by Procedure Inadequacy.Plant Procedure OSP/TIP/IST-R701 Will Be changed.W/970818 Ltr
ML17292B0291997-08-15015 August 1997
LER 97-008-00:on 970716,wire Seal Used to Lock Containment Instrument Air Pressure Control valve,CIA-PCV-2B,found Not Intact.Cause of Misadjustment of CIA-PCV-2B Unknown.Event Will Be Communicated to Plant employees.W/970815 Ltr
ML17292B0201997-08-15015 August 1997
LER 97-S01-00:on 970718,failure to Take Compensatory Measure for Inoperative Microwave Security Zone Occurred. Caused by Personnel Error.Training Will Be Conducted W/ Appropriate Members of Security force.W/970815 Ltr
ML17292A9481997-07-23023 July 1997
LER 97-007-00:on 970611,voluntary Rept of Automatic Start of DG-1 & DG-2 Was Experienced.Caused by Undervoltage Condition on Electrical Busses SM-7 & SM-8.Circulating Water Pump CW-P-1C Control Switch Placed in pull-to-lock.W/970723 Ltr
ML17292A9201997-06-26026 June 1997
LER 97-006-00:on 970527,non-performance of Surveillance Requirement 3.6.1.3.2 for Blind Fanges,Was Noted.Caused Because Misunderstanding of Intent of Specs.Added Five Structural Assemblies for SP.W/970626 Ltr
ML17292A8331997-04-28028 April 1997
LER 97-004-00:on 970327,plant Operators Manually Scrammed Reactor as Required by TS Due to Entry Into Region a of power-to-flow Map Following Planned Trip of Single Mfp. Event Evaluation teams,established.W/970428 Ltr
ML17292A8311997-04-28028 April 1997
LER 97-005-00:on 970327,valid Reactor Scram Signal Received Due to Low Water Level Condition During Preparations for SRV Testing.Caused by Risks & Consequences of Decisions Not Completely Identified.Restored Water level.W/970428 Ltr
ML17292A8251997-04-21021 April 1997
LER 97-003-00:on 970320,notification of Noncompliance W/Ts as TS SRs for Response Time Testing Were Not Being Met for Specified Instrumentation in Rps,Pcis & Eccs.Requested Enforcement Discretion for One Time exemption.W/970421 Ltr
ML17292A7431997-03-20020 March 1997
LER 97-002-00:on 970218,determined That Rod Block Monitor (RBM) Calibr Values Were Not Set IAW Tech Specs.Caused by Calibr Procedures Inadequacies.Revised & re-performed RBM Channel Calibr procedures.W/970330 Ltr
ML17292A7401997-03-13013 March 1997
LER 97-001-00:on 970211,reactor Water Cleanup Sys Blowdown Flow Isolation Setpoint Was Slightly Above TS Allowable Valve Occurred Due to Calculation Error.Lds Fss LD-FS-15 LD-FS-16 Were Declared inoperable.W/970313 Ltr
ML17292A6641997-01-22022 January 1997
LER 96-009-00:on 961220,miscalculation of Instantaneous Overcurrent Relay Settings Resulted in Inoperability of safety-related Equipment.Caused by Utilization of Inappropriate Design.Testing Was completed.W/970122 Ltr
ML17292A6461997-01-0606 January 1997
LER 96-008-00:on 961205,failure to Comply with TS Action Requirement for Emergency Core Cooling Sys Actuation Instrumentation Occurred Due to Unidentified Inoperability Condition.Pmr initiated.W/970106 Ltr
ML17292A6371996-12-19019 December 1996
LER 96-007-00:on 961122,electrical Breakers Were Not Seismically Qualified in Test/Disconnect Position.Circuit Breaker Mfg Did Not Consider Raced Out Breaker Position During Testing.Relocated Circuit breakers.W/961217 Ltr
ML17292A4121996-08-0808 August 1996
LER 96-006-00:on 960709,average Power Range Monitor Rod Block Downscale Surveillance Not Performed Prior to Entry Into Mode 1.Caused by long-standing Misinterpretation of Requirements of Tss.Procedures revised.W/960808 Ltr
ML17292A3801996-07-24024 July 1996
LER 96-004-00:on 960624,plant Was Manually Scrammed by Control Room Personnel Due to Reactor Water Level Transient Experienced During Testing of Digital Feedwater Sys.Caused by Programming Error.Sys Was corrected.W/960724 Ltr
ML17292A3771996-07-24024 July 1996
LER 96-005-00:on 960624,determined Missed Surveillance Test Re Channel Check of Average Power Range Monitor.Caused by Inadequate Procedures.Revised Surveillance Procedure Re When APRM Checks Must Be performed.W/960724 Ltr
ML17292A3641996-07-12012 July 1996
LER 96-003-00:on 960615,required Surveillance Test Not Performed When Required by TS 3.4.1.3.Caused by Inadequate Procedures.Implementing Surveillance Procedure & Reactor Plant Startup Procedures revised.W/960712 Ltr
ML17292A3361996-06-20020 June 1996
LER 96-002-00:on 960504,critical Bus SM-8 Lost Power When Supply Breaker 3-8 Tripped.Caused by Personnel Error. Operators Counselled & Procedures revised.W/960620 Ltr
ML17292A2861996-05-24024 May 1996
LER 96-001-00:on 960425,inadvertent ESF Actuations Occurred Due to Tripping of Temporary Power Supply to IN-3.Caused by Personnel Error.Operations Restored to IN-3 Loads & Reset ESF actuations.W/960524 Ltr
ML17291B0891995-10-19019 October 1995
LER 95-011-00:on 950919,failed to Comply W/Ts SR for RCIC Sys Due to Analysis Deficiency That Resulted in Inadequate Surveillance Test Procedure.Surveillance Procedure Revised to Correct deficiency.W/951019 Ltr
ML17291A9021995-07-0707 July 1995
LER 95-010-00:on 950609,HPCS DG Declared Inoperable Due to Discovery That TS Test Method Incomplete.Caused by Inadequate Testing Procedure.Test Procedure for HPCS DG Reviewed & Special Test Procedures written.W/950707 Ltr
ML17291A9031995-07-0707 July 1995
LER 95-009-00:on 950607,inadvertent MSIV Closure Occurred During Surveillance Test Due to Poor Communication Between Test Team.Determined That MSIV Closure Not Valid Because Closure Not Triggered by Plant conditions.W/950707 Ltr
ML17291A8501995-06-0808 June 1995
LER 95-006-01:on 950405,reactor Scram Occurred During Surveillance Testing Due to Protective Sys Relay Failure. Replaced Failed Relay Before Plant Startup
ML17291A8101995-05-12012 May 1995
LER 95-008-00:on 940125,TS Wording Lead to Potential TS Violation.Caused by Lack of Clarity in Ts.Submitted Improved TS for Plant to Provide Addl clarity.W/950512 Ltr
ML17291A7841995-05-0505 May 1995
LER 95-007-00:on 950222,emergency Diesel Start Occurred Due to Voltage Transient on BPA Grid.Confirmation Was Received at 17:51 H That Disturbance Had Originated in BPA Grid
ML17291A7801995-05-0404 May 1995
LER 95-006-00:on 950405,main Turbine Trip Occurred During Performance of Surveillance Test Due to Protective Sys Relay Failed.Replaced Failed Relay Before Plant startup.W/950504 Ltr
ML17291A7851995-05-0303 May 1995
LER 95-005-00:on 950222,inoperable IRM Had Been Relied Upon to Meet TS Requirements During Reactor Startup.Caused by Lack of Neutron Source to Test Instrumentation. Sys Knowledge Gained Will Be incorporated.W/950503 Ltr
ML17291A7071995-03-25025 March 1995
LER 95-004-00:on 950226,malfunction in Main Turbine DEH Control Sys Caused All Four High Pressure Turbine Governor Valves to Rapidly Close.Caused by Blown Fuse.Suspected Faulty Circuit Card replaced.W/950325 Ltr
ML17291A7011995-03-20020 March 1995
LER 95-002-00:on 950218,automatic Reactor Scram Occurred. Caused by Erroneous Positioning of Control During Performance of Scheduled Periodic Functional Test.Control repositioned.W/950320 Ltr
1999-07-20
[Table view]
Category:RO)
MONTHYEARML17292B7421999-07-20020 July 1999
LER 99-001-00:on 990628,ESF Signal Closed All Eight MSIVs While Plant Was Shutdown.Caused by Failure of Relay RPS-RLY-K10D.Subject Relay Was Replaced & Tested on 990630. with 990720 Ltr
ML17292B4451998-10-27027 October 1998
LER 98-012-01:on 980715,failure to Comply with Requirements of TS SR 3.8.4.7 Was Noted.Caused by Inadequate Work Practices.Training Session Was Held with Personnel.With 981027 Ltr
ML17284A7561998-09-0303 September 1998
LER 98-013-00:on 980805,ESF Actuations Were Noted Due to Deenergization of Vital Electrical Bus SM-8.Caused by Inadequate Direction in Troubleshooting Plan.Will Conduct Training for Engineering Personnel.With 980903 Ltr
ML17284A7571998-09-0202 September 1998
LER 98-014-00:on 980807,completion of TS 3.8.1.F Required Shutdown Due to Inoperability of EDG-2 Was Noted.Caused by Degraded Voltage Regulator for DG-2.Replaced Voltage Regulator & Associated Scrs.With 980902 Ltr
ML17284A7551998-09-0202 September 1998
LER 98-015-00:on 980808,discovered Reactor Coolant Pressure Boundary Leak During Shutdown Conditions.Caused by Leakage from Socket Weld (Fwb 63) on Elbow Connection.Failed Piping Connection Was Replaced.With 980902 Ltr
ML17284A7311998-08-17017 August 1998
LER 98-012-00:on 980716,determined That 24-month SR 3.8.4.7 Had Not Been Fulfilled within Specified Frequency.Caused by Inadequate Work Practices.License Requested & Received Enforcement Discretion Re Battery Svc test.W/980817 Ltr
ML17284A7121998-07-23023 July 1998
LER 98-006-01:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of 10CFR50,App R Calculations for High Impedance Faults.Caused by Inadequate Work Practices.Implemented Procedural Changes
ML17284A6951998-07-17017 July 1998
LER 98-011-00:on 980617,ECCS Pump Room Flooding Was Noted Due to FP Sys Pipe Break.Caused by Inadequate Design of FP Sys.Detailed Review of FP Sys Design Was Conducted. W/980717 Ltr
ML17284A6961998-07-15015 July 1998
LER 98-010-00:on 980615,TS Required Shutdown Due to Inoperability of TIP Sys Isolation Valve Was Noted.Caused by Improper Installation of TIP Tubing.Reattached Affected Tubing & Inspected Other TIP tubing.W/980715 Ltr
ML17284A6731998-07-0101 July 1998
LER 98-009-00:on 980606,nuclear Steam Supply Shutoff Sys Group 3 & 4 Isolations During Testing Was Noted.Caused by Procedural Deficiency.Counseled Individuals Involved in preparation.W/980701 Ltr
ML17284A6651998-06-24024 June 1998
LER 98-007-00:on 980530,inadvertent Full Scram & Division 1 ECCS Injection Was Noted.Caused by Failure to Meet Mgt Work Practice Expectation When Encountering Deficient Procedure. Incident Review Board Convened to Review event.W/980624 Ltr
ML17284A6641998-06-24024 June 1998
LER 98-008-00:on 980531,inadvertent Full Scram During RPV Leak Testing in Mode 4 Was Noted.Caused by Change in Mgt Techniques.Revised Procedures to Take Into Account Addl Water Head in Pressure Sensing lines.W/980624 Ltr
ML17284A6631998-06-19019 June 1998
LER 98-006-00:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of App R Calculations for High Impedance Fault Analysis.Caused Indeterminate. Implemented Procedural Changes Involving Operator Action
ML17284A6551998-06-0404 June 1998
LER 98-005-00:on 980506,potential for Failure of RHR Sys Valve to Close on Isolation Signal Was Noted.Caused by Design Deficiency.Caution Tag Was Placed on RHR-V-40 Control Switch to Inform Plant Operators of limitation.W/980604 Ltr
ML17284A6421998-06-0101 June 1998
LER 98-004-00:on 980502,determined That Primary Containment Penetration Overcurrent Protection Does Not Meet Reg Guide 1.63 Requirements.Caused by Inadequate Design Changes. Installed Addl Fuse in RHR-MO-9 circuit.W/980601 Ltr
ML17292B3281998-04-0909 April 1998
LER 98-002-00:on 980311,reactor Scram & Plant Transient Occurred,Due to Failed Closed Main Steam Isolation Valve. Caused by Loss of Pneumatic Actuating Supply Pressure. Problem Evaluation Request Written for Failure of MS-V-22D
ML17292B3291998-04-0909 April 1998
LER 98-003-00:on 980311,WNP-2 Experienced SCRAM Signal as Result of Low Rpv.Caused by Less than post-SCRAM Operational Strategy for Resetting SCRAM Signal in Conditions.Changes in post-SCRAM Operational Strategy implemented.W/980409 Ltr
ML17292B2661998-03-0404 March 1998
LER 98-001-00:on 980203,automatic Start of HPCS EDG Was Noted.Caused by Operator Error.Operations Crew Stabilized Plant at Approximately 75% Reactor Power & Investigation of Event Was initiated.W/980304 Ltr
ML17292B1111997-11-10010 November 1997
LER 97-011-00:on 971010,HPCS Battery Charger Failed.Caused by Failure of a Phase Firing Control Circuit Board Due to Aging During 7 Yrs of Use.Hpcs Sys Was Immediately Declared inoperable.W/971110 Ltr
ML17292B1151997-11-0707 November 1997
LER 97-010-00:on 970906,discovered That TS SR 3.4.5.1 for Identified Portion of RCS Total Leakage Would Not Be Able to Perform within Time Limits of SR 3.0.2.Caused by Inadequate Methods.Method of Meeting SR 3.4.5.1 Established
ML17292B0641997-09-24024 September 1997
LER 97-004-01:on 970327,plant Operators Manually Scrammed Reactor as Required by TS Due to Indication of Entry Into Region a of power-to-flow Map.Caused by Inadequate Attention to Detail.Established Event Evaluation teams.W/970924 Ltr
ML17292B0241997-08-18018 August 1997
LER 97-009-00:on 970717,discovered Error in Recently Performed Inservice Testing procedure,OSP-TIP/IST-R701. Caused by Procedure Inadequacy.Plant Procedure OSP/TIP/IST-R701 Will Be changed.W/970818 Ltr
ML17292B0291997-08-15015 August 1997
LER 97-008-00:on 970716,wire Seal Used to Lock Containment Instrument Air Pressure Control valve,CIA-PCV-2B,found Not Intact.Cause of Misadjustment of CIA-PCV-2B Unknown.Event Will Be Communicated to Plant employees.W/970815 Ltr
ML17292B0201997-08-15015 August 1997
LER 97-S01-00:on 970718,failure to Take Compensatory Measure for Inoperative Microwave Security Zone Occurred. Caused by Personnel Error.Training Will Be Conducted W/ Appropriate Members of Security force.W/970815 Ltr
ML17292A9481997-07-23023 July 1997
LER 97-007-00:on 970611,voluntary Rept of Automatic Start of DG-1 & DG-2 Was Experienced.Caused by Undervoltage Condition on Electrical Busses SM-7 & SM-8.Circulating Water Pump CW-P-1C Control Switch Placed in pull-to-lock.W/970723 Ltr
ML17292A9201997-06-26026 June 1997
LER 97-006-00:on 970527,non-performance of Surveillance Requirement 3.6.1.3.2 for Blind Fanges,Was Noted.Caused Because Misunderstanding of Intent of Specs.Added Five Structural Assemblies for SP.W/970626 Ltr
ML17292A8331997-04-28028 April 1997
LER 97-004-00:on 970327,plant Operators Manually Scrammed Reactor as Required by TS Due to Entry Into Region a of power-to-flow Map Following Planned Trip of Single Mfp. Event Evaluation teams,established.W/970428 Ltr
ML17292A8311997-04-28028 April 1997
LER 97-005-00:on 970327,valid Reactor Scram Signal Received Due to Low Water Level Condition During Preparations for SRV Testing.Caused by Risks & Consequences of Decisions Not Completely Identified.Restored Water level.W/970428 Ltr
ML17292A8251997-04-21021 April 1997
LER 97-003-00:on 970320,notification of Noncompliance W/Ts as TS SRs for Response Time Testing Were Not Being Met for Specified Instrumentation in Rps,Pcis & Eccs.Requested Enforcement Discretion for One Time exemption.W/970421 Ltr
ML17292A7431997-03-20020 March 1997
LER 97-002-00:on 970218,determined That Rod Block Monitor (RBM) Calibr Values Were Not Set IAW Tech Specs.Caused by Calibr Procedures Inadequacies.Revised & re-performed RBM Channel Calibr procedures.W/970330 Ltr
ML17292A7401997-03-13013 March 1997
LER 97-001-00:on 970211,reactor Water Cleanup Sys Blowdown Flow Isolation Setpoint Was Slightly Above TS Allowable Valve Occurred Due to Calculation Error.Lds Fss LD-FS-15 LD-FS-16 Were Declared inoperable.W/970313 Ltr
ML17292A6641997-01-22022 January 1997
LER 96-009-00:on 961220,miscalculation of Instantaneous Overcurrent Relay Settings Resulted in Inoperability of safety-related Equipment.Caused by Utilization of Inappropriate Design.Testing Was completed.W/970122 Ltr
ML17292A6461997-01-0606 January 1997
LER 96-008-00:on 961205,failure to Comply with TS Action Requirement for Emergency Core Cooling Sys Actuation Instrumentation Occurred Due to Unidentified Inoperability Condition.Pmr initiated.W/970106 Ltr
ML17292A6371996-12-19019 December 1996
LER 96-007-00:on 961122,electrical Breakers Were Not Seismically Qualified in Test/Disconnect Position.Circuit Breaker Mfg Did Not Consider Raced Out Breaker Position During Testing.Relocated Circuit breakers.W/961217 Ltr
ML17292A4121996-08-0808 August 1996
LER 96-006-00:on 960709,average Power Range Monitor Rod Block Downscale Surveillance Not Performed Prior to Entry Into Mode 1.Caused by long-standing Misinterpretation of Requirements of Tss.Procedures revised.W/960808 Ltr
ML17292A3801996-07-24024 July 1996
LER 96-004-00:on 960624,plant Was Manually Scrammed by Control Room Personnel Due to Reactor Water Level Transient Experienced During Testing of Digital Feedwater Sys.Caused by Programming Error.Sys Was corrected.W/960724 Ltr
ML17292A3771996-07-24024 July 1996
LER 96-005-00:on 960624,determined Missed Surveillance Test Re Channel Check of Average Power Range Monitor.Caused by Inadequate Procedures.Revised Surveillance Procedure Re When APRM Checks Must Be performed.W/960724 Ltr
ML17292A3641996-07-12012 July 1996
LER 96-003-00:on 960615,required Surveillance Test Not Performed When Required by TS 3.4.1.3.Caused by Inadequate Procedures.Implementing Surveillance Procedure & Reactor Plant Startup Procedures revised.W/960712 Ltr
ML17292A3361996-06-20020 June 1996
LER 96-002-00:on 960504,critical Bus SM-8 Lost Power When Supply Breaker 3-8 Tripped.Caused by Personnel Error. Operators Counselled & Procedures revised.W/960620 Ltr
ML17292A2861996-05-24024 May 1996
LER 96-001-00:on 960425,inadvertent ESF Actuations Occurred Due to Tripping of Temporary Power Supply to IN-3.Caused by Personnel Error.Operations Restored to IN-3 Loads & Reset ESF actuations.W/960524 Ltr
ML17291B0891995-10-19019 October 1995
LER 95-011-00:on 950919,failed to Comply W/Ts SR for RCIC Sys Due to Analysis Deficiency That Resulted in Inadequate Surveillance Test Procedure.Surveillance Procedure Revised to Correct deficiency.W/951019 Ltr
ML17291A9021995-07-0707 July 1995
LER 95-010-00:on 950609,HPCS DG Declared Inoperable Due to Discovery That TS Test Method Incomplete.Caused by Inadequate Testing Procedure.Test Procedure for HPCS DG Reviewed & Special Test Procedures written.W/950707 Ltr
ML17291A9031995-07-0707 July 1995
LER 95-009-00:on 950607,inadvertent MSIV Closure Occurred During Surveillance Test Due to Poor Communication Between Test Team.Determined That MSIV Closure Not Valid Because Closure Not Triggered by Plant conditions.W/950707 Ltr
ML17291A8501995-06-0808 June 1995
LER 95-006-01:on 950405,reactor Scram Occurred During Surveillance Testing Due to Protective Sys Relay Failure. Replaced Failed Relay Before Plant Startup
ML17291A8101995-05-12012 May 1995
LER 95-008-00:on 940125,TS Wording Lead to Potential TS Violation.Caused by Lack of Clarity in Ts.Submitted Improved TS for Plant to Provide Addl clarity.W/950512 Ltr
ML17291A7841995-05-0505 May 1995
LER 95-007-00:on 950222,emergency Diesel Start Occurred Due to Voltage Transient on BPA Grid.Confirmation Was Received at 17:51 H That Disturbance Had Originated in BPA Grid
ML17291A7801995-05-0404 May 1995
LER 95-006-00:on 950405,main Turbine Trip Occurred During Performance of Surveillance Test Due to Protective Sys Relay Failed.Replaced Failed Relay Before Plant startup.W/950504 Ltr
ML17291A7851995-05-0303 May 1995
LER 95-005-00:on 950222,inoperable IRM Had Been Relied Upon to Meet TS Requirements During Reactor Startup.Caused by Lack of Neutron Source to Test Instrumentation. Sys Knowledge Gained Will Be incorporated.W/950503 Ltr
ML17291A7071995-03-25025 March 1995
LER 95-004-00:on 950226,malfunction in Main Turbine DEH Control Sys Caused All Four High Pressure Turbine Governor Valves to Rapidly Close.Caused by Blown Fuse.Suspected Faulty Circuit Card replaced.W/950325 Ltr
ML17291A7011995-03-20020 March 1995
LER 95-002-00:on 950218,automatic Reactor Scram Occurred. Caused by Erroneous Positioning of Control During Performance of Scheduled Periodic Functional Test.Control repositioned.W/950320 Ltr
1999-07-20
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML17284A9001999-10-31031 October 1999
Rev 0 to COLR 99-15, WNP-2 Cycle 15,COLR
GO2-99-177, LER 99-S01-00:on 990903,failure to Take Compensatory Measure within Required Time Upon Failure of Isolation Zone Microwave Unit,Was Noted.Caused by Personnel Error.Provided Refresher Training on Compensatory Measures.With1999-10-0101 October 1999
LER 99-S01-00:on 990903,failure to Take Compensatory Measure within Required Time Upon Failure of Isolation Zone Microwave Unit,Was Noted.Caused by Personnel Error.Provided Refresher Training on Compensatory Measures.With
ML17284A8941999-09-30030 September 1999
Monthly Operating Rept for Sept 1999 for WNP-2.With 991012 Ltr
ML17284A8801999-08-31031 August 1999
Monthly Operating Rept for Aug 1999 for WNP-2.With 990910 Ltr
ML17284A8691999-07-31031 July 1999
Monthly Operating Rept for July 1999 for WNP-2.With 990813 Ltr
ML17292B7421999-07-20020 July 1999
LER 99-001-00:on 990628,ESF Signal Closed All Eight MSIVs While Plant Was Shutdown.Caused by Failure of Relay RPS-RLY-K10D.Subject Relay Was Replaced & Tested on 990630. with 990720 Ltr
ML17292B7271999-06-30030 June 1999
Monthly Operating Rept for June 1999 for WNP-2.With 990707 Ltr
ML17292B6961999-05-31031 May 1999
Monthly Operating Repts for May 1999 for WNP-2.With 990608 Ltr
ML17292B6641999-04-30030 April 1999
Monthly Operating Rept for Apr 1999 for WNP-2.With 990507 Ltr
ML17292B6391999-03-31031 March 1999
Monthly Operating Rept for Mar 1999 for WNP-2.With 990413 Ltr
ML17292B5871999-02-28028 February 1999
Monthly Operating Rept for Feb 1999 for WNP-2.With 990311 Ltr
ML17292B5571999-01-31031 January 1999
Monthly Operating Rept for Jan 1999 for WNP-2.With 990210 Ltr
ML17292B5621999-01-31031 January 1999
Rev 1 to COLR 98-14, WNP-2 Cycle 14 Colr.
ML17292B5341999-01-15015 January 1999
Part 21 Rept Re Incorrect Modeling of BWR Lower Plenum Vol in Bison.Defect Applies Only to Reload Fuel Assemblies Currently in Operation at WNP-2.BISON Code Model for WNP-2 Has Been Revised to Correct Error
ML17292B5331999-01-15015 January 1999
Part 21 Rept Re XL-S96 CPR Correlation for SVEA-96 Fuel. Defect Applies Only to WNP-2,during Cycles 12,13 & 14 Operation.Evaluations of Defect Performed by ABB-CE
ML17292B4791998-12-31031 December 1998
Washington Public Power Supply Sys 1998 Annual Rept. with 981215 Ltr
ML17292B5351998-12-31031 December 1998
Monthly Operating Rept for Dec 1998 for WNP-2.With 990112 Ltr
ML17292B5741998-12-31031 December 1998
WNP-2 1998 Annual Operating Rept. with 990225 Ltr
ML17284A8231998-11-30030 November 1998
Monthly Operating Rept for Nov 1998 for WNP-2.With 981207 Ltr
ML17284A8081998-10-31031 October 1998
Monthly Operating Rept for Oct 1998 for WNP-2.With 981110 Ltr
ML17292B4451998-10-27027 October 1998
LER 98-012-01:on 980715,failure to Comply with Requirements of TS SR 3.8.4.7 Was Noted.Caused by Inadequate Work Practices.Training Session Was Held with Personnel.With 981027 Ltr
ML17284A7831998-09-30030 September 1998
Monthly Operating Rept for Sept 1998 for WNP-2.With 981007 Ltr
ML17284A7491998-09-10010 September 1998
WNP-2 Inservice Insp Summary Rept for Refueling Outage RF13 Spring,1998.
ML17284A7561998-09-0303 September 1998
LER 98-013-00:on 980805,ESF Actuations Were Noted Due to Deenergization of Vital Electrical Bus SM-8.Caused by Inadequate Direction in Troubleshooting Plan.Will Conduct Training for Engineering Personnel.With 980903 Ltr
ML17284A7571998-09-0202 September 1998
LER 98-014-00:on 980807,completion of TS 3.8.1.F Required Shutdown Due to Inoperability of EDG-2 Was Noted.Caused by Degraded Voltage Regulator for DG-2.Replaced Voltage Regulator & Associated Scrs.With 980902 Ltr
ML17284A7551998-09-0202 September 1998
LER 98-015-00:on 980808,discovered Reactor Coolant Pressure Boundary Leak During Shutdown Conditions.Caused by Leakage from Socket Weld (Fwb 63) on Elbow Connection.Failed Piping Connection Was Replaced.With 980902 Ltr
ML17284A7681998-08-31031 August 1998
Monthly Operating Rept for Aug 1998 for WNP-2.With 980915 Ltr
ML17284A7311998-08-17017 August 1998
LER 98-012-00:on 980716,determined That 24-month SR 3.8.4.7 Had Not Been Fulfilled within Specified Frequency.Caused by Inadequate Work Practices.License Requested & Received Enforcement Discretion Re Battery Svc test.W/980817 Ltr
ML17284A7261998-07-31031 July 1998
Monthly Operating Rept for July 1998 for WNP-2.W/980810 Ltr
ML17284A7121998-07-23023 July 1998
LER 98-006-01:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of 10CFR50,App R Calculations for High Impedance Faults.Caused by Inadequate Work Practices.Implemented Procedural Changes
ML17284A6951998-07-17017 July 1998
LER 98-011-00:on 980617,ECCS Pump Room Flooding Was Noted Due to FP Sys Pipe Break.Caused by Inadequate Design of FP Sys.Detailed Review of FP Sys Design Was Conducted. W/980717 Ltr
ML17284A6961998-07-15015 July 1998
LER 98-010-00:on 980615,TS Required Shutdown Due to Inoperability of TIP Sys Isolation Valve Was Noted.Caused by Improper Installation of TIP Tubing.Reattached Affected Tubing & Inspected Other TIP tubing.W/980715 Ltr
ML17284A6731998-07-0101 July 1998
LER 98-009-00:on 980606,nuclear Steam Supply Shutoff Sys Group 3 & 4 Isolations During Testing Was Noted.Caused by Procedural Deficiency.Counseled Individuals Involved in preparation.W/980701 Ltr
ML17284A6751998-06-30030 June 1998
Ro:On 980617,flooding of RB Northeast Stairwell with Consequential Flooding of Two ECCS Pump Rooms.Caused by Inadequate Fire Protection Sys Design.Pumped Out Water from Affected Areas to Point Below Berm Areas of Pump Rooms
ML17284A6641998-06-24024 June 1998
LER 98-008-00:on 980531,inadvertent Full Scram During RPV Leak Testing in Mode 4 Was Noted.Caused by Change in Mgt Techniques.Revised Procedures to Take Into Account Addl Water Head in Pressure Sensing lines.W/980624 Ltr
ML17284A6651998-06-24024 June 1998
LER 98-007-00:on 980530,inadvertent Full Scram & Division 1 ECCS Injection Was Noted.Caused by Failure to Meet Mgt Work Practice Expectation When Encountering Deficient Procedure. Incident Review Board Convened to Review event.W/980624 Ltr
ML17284A6631998-06-19019 June 1998
LER 98-006-00:on 980520,discovered Discrepancies in Low Voltage Bus Calculations During Review of App R Calculations for High Impedance Fault Analysis.Caused Indeterminate. Implemented Procedural Changes Involving Operator Action
ML17284A6551998-06-0404 June 1998
LER 98-005-00:on 980506,potential for Failure of RHR Sys Valve to Close on Isolation Signal Was Noted.Caused by Design Deficiency.Caution Tag Was Placed on RHR-V-40 Control Switch to Inform Plant Operators of limitation.W/980604 Ltr
ML17284A6421998-06-0101 June 1998
LER 98-004-00:on 980502,determined That Primary Containment Penetration Overcurrent Protection Does Not Meet Reg Guide 1.63 Requirements.Caused by Inadequate Design Changes. Installed Addl Fuse in RHR-MO-9 circuit.W/980601 Ltr
ML17284A6491998-05-31031 May 1998
Rev 0 to COLR 98-14, WNP-2,Cycle 14 Colr.
ML17292B4031998-05-31031 May 1998
Monthly Operating Rept for May 1998 for WNP-2.W/980608 Ltr
ML17292B3921998-04-30030 April 1998
Monthly Operating Rept for Apr 1998 for WNP-2.W/980513 Ltr
ML17292B3291998-04-0909 April 1998
LER 98-003-00:on 980311,WNP-2 Experienced SCRAM Signal as Result of Low Rpv.Caused by Less than post-SCRAM Operational Strategy for Resetting SCRAM Signal in Conditions.Changes in post-SCRAM Operational Strategy implemented.W/980409 Ltr
ML17292B3281998-04-0909 April 1998
LER 98-002-00:on 980311,reactor Scram & Plant Transient Occurred,Due to Failed Closed Main Steam Isolation Valve. Caused by Loss of Pneumatic Actuating Supply Pressure. Problem Evaluation Request Written for Failure of MS-V-22D
ML17292B3371998-03-31031 March 1998
Monthly Operating Rept for Mar 1998 for WNP-2.W/980409 Ltr
ML17292B2641998-03-0404 March 1998
Performance Self Assessment,WNP-2.
ML17292B2661998-03-0404 March 1998
LER 98-001-00:on 980203,automatic Start of HPCS EDG Was Noted.Caused by Operator Error.Operations Crew Stabilized Plant at Approximately 75% Reactor Power & Investigation of Event Was initiated.W/980304 Ltr
ML17292B2911998-02-28028 February 1998
Monthly Operating Rept for Feb 1998 for WNP-2.W/980313 Ltr
ML17284A7971998-02-17017 February 1998
Rev 28 to Operational QA Program Description, WPPSS-QA-004.With Proposed Rev 29
ML17292B3591998-02-12012 February 1998
WNP-2 Cycle 14 Reload Design Rept.
1999-09-30
[Table view] |
Text
CATEGORY REGULAT INFORMATION DISTRIBUTIO YSTEM (RIDS)ACCESSION NBR:9708250397 DOC.DATE: 97/08/15 NOTARIZED:
NO DOCKET I FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.NAME AUTHOR AFFILIAT:ON PFITRER,B.
Washington Public Power Supply System BEMIS,P.R.
Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION
SUBJECT:
LER 97-008-00:on 970716,wire seal used to lock containment instrument air pressure control valve,CIA-PCV-2B,found not intact.Cause of misadjustment of CIA-PCV-2B unknown.Event wil'e communicar,ed to plane employees.W/970815 itr.DZSTRIBDTZON CODE: ZE22T COPIES RECEIVED:LTR 1 ENCL 1 SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.NOTES: RECIPIENT ID CODE/NAME PD4-2 PD INTERNAL: ACRS AEOD/SPD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DRCH/HICB NRR/DRCH/HQMB NRR/DSSA/SPLB RES/DET/EIB EXTERNAL: L ST LOBBY WARD NOAC POOREEW.NRC PDR COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1'1 1 1 1 1 RECIPIENT ID CODE/NAME COLBURN,T AEOD PD B FIGE CENTE EEI B NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRPM/PECB NRR/DSSA/SRXB RGN4 FILE 01 LITCO BRYCE,J H NOAC QUEENER,DS NUDOCS FULL TXT COPIES LTTR ENCL 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D 0 N NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE.TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL 25 WASHIi JGTON PUBLIC POWER SUPPLY SYSTEM'O.13ox 968~ltichlond, tt'isshiwgton 99352-0968 August 15, 1997 G02-97-157 Docket No.50-397 Document Control Desk U.S.Nuclear Regulatory Commission Washington, D.C.20555 Gentlemen:
Subject:
NUCLIAR PLANT WNP-2, OPERATING LICENSE NPF-21, LICENSEE E&~2lT REPORT NO.97-008-00 Transmitted herewith is Licensee Event Report No.97-008-00 for WNP-2.This report is submitted pursuant to 10 CFR 50.73 and discusses the items of reportability, corrective action-taken, and action to preclude recurrence.
Should you have any questions or desire additional information regarding this matter, please call me or Mr.Paul Inserra at (509)377-4147.R tfully,~~s Vice President, Nuclear Operations Mail Drop PE23 Enclosure cc: EW Merschoff, NRC RIV KE Perkins, Jr., NRC RIV, WCFO TG Colburn, NRR PD Robinson, Winston&Strawn NRC Sr.Resident Inspector, MD927N (2)INPO Records Center-Atlanta, GA DL Williams, BPA, MD399 9708250397 9708i5 PDR ADOCK 0500OS'P7 S PDR llllllllllllllllllllllllllillllllllll LICE SEE EVENT REPORT LER FACILITY NAME{1)Washin ton Nuclear Plant-Unit 2 DOCKET NUMBER (2)50-397 PAGE (3)1OF3 TITLE{4)INOPERABILITY OF FOUR AUTOMATIC DEPRESSURIZATION SYSTEM VALVES DUE TO CIA-PCV-2B PRESSURE SETPOINT DISCOVERED SET LESS THAN REQUIRED EVENT DATE{5)OAY 07 16 97 97 LER NUMBER{61 SEOUENRAL NUMBER REPORT DATE{71 REV.NUMBER 00 08 OAY YEAR FACILffY NAME 15 97 F AC)L)TY NAME N/A DOCKET NUMBER DOCKET NUMBER 05000 OTHER FACILITIES INVOLVED IBI OPERATING MODE THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OP 10 CPR 5: (Check one or motel Ill)90%20.402{b)20.405(a)(1)
Q 20.405(a)(1)(ii)20.405(a)(1)(iii) 20.405(a)(1)(iv) 20.405(a)(1)(v)
X 20.405(c)$0.36(c)(1)$036(c)(2)50 73(a){2){))50.73(a)(2)(ii) 50.73(a)(2)(iii)50.73{a)(2)
{iv)50.73(a)(2)(v) 50.73(a)(2)(vii)50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B)50.73(a)(2)(x) 73.71{b).73.71(c)OTHER NAME Bill Pfitzer, Licensing Engineer LICENSEE CONTACT FOR THIS LER{12)TELEPHONE NUMBER{Include Area Code)509-377-2419 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)CAUSE SYSTEM COMPONENT M))I)FAcTT)RER REPORTABLE TO NPROS CAUS F SYSTEM COMPONENT MANUFACTURER REPORTABLE TO NPRDS SUPPLEMENTAL REPORT EXPECTED (14)YES corn Ieted EXPECTED SUBMISSION DAT NO EXPECTED MONTH DAY YEAR ABSTRACT: On July 16, 1997, with the plant operating at 90%power, the wire seal used to lock containment instrument air pressure control valve, CIA-PCV-2B, was found not intact.This valve controls backup nitrogen pressure (actuating medium)to the four subsystem B automatic depressurization system (ADS)valves.Subsequent maintenance troubleshooting activities revealed the setpoint for CIA-PCV-2B was set to approximately 63 psig, well below the intended setpoint of 180+/-2 psig.Security and Operations have conducted an investigation into this event.It was determined that this valve was set to its required setpoint during CIA system startup following system maintenance during the last outage.No clear evidence of tampering was found since that time, and the cause of the misadjustment of CIA-PCV-2B is unknown.As a corrective action, the setpoint for CIA-PCV-2B has been readjusted to 180+/-2 psig and a new locking wire seal was installed.
This condition is reported per 10 CFR 50.73(a)(2)(ii) as a condition prohibited by Technical Specifications.
Due to the redundant design features of ADS, both the long term and short term functions of ADS would have been accomplished during the period when CIA-PCV-2B was misadjusted.
Therefore, the safety significance of this event is minimal.
fACILITY NAME Il)LICENSEE EVENT REPORT (LER)TEXT CONTINUATION DOCKET NUMBER (2)YEAR LER NUMBER I6)SEQUENTIAL NUMBER REVr S 10M WNBSA PAGE (3)Washington Nuclear Plant-Unit 2 50-397 97 008 00 2 OF 3 TEXT (If more space is required, Use additional copies of NRC Form 366A)(17)Event De cri tion On July 16, 1997, with the plant operating at 90%power, the wire seal used to lock containment instrument air[LD]pressure control valve[PCV], CIA-PCV-2B, was found not intact.This valve controls backup nitrogen pressure (actuating medium)to the four B subsystem ADS valves.Subsequent maintenance troubleshooting activities revealed the setpoint for CIA-PCV-2B was set to approximately 63 psig, well below the intended setpoint of 180+/-2 psig.This regulating valve was set to its required setpoint during CIA system startup following system maintenance during the last outage.Reactor startup from the last refueling outage occurred on July 4, 1997.CIA nitrogen bottles supply the backup actuating medium to the ADS valves via CIA-PCV-2B.
Throughout the event, including the maintenance activities to reset CIA-PCV-2B, all seven ADS valves were supplied by the containment nitrogen system (CN)[LK]which supplies the normal actuating medium to the ADS valves.Immedia e orrective Action On July 18, 1997, the CIA supply to ADS subsystem B was isolated in preparation for verifying the setpoint of CIA-PCV-2B, and accordingly entry was made into Technical Specification Action Statement (TSAS)3.5.1.G.The setpoint for CIA-PCV-2B was found to be 63 psig and was readjusted to 180+/-2 psig and a new locking wire seal was installed.
After restoration of the CIA supply, TSAS 3.5.1.G was exited.F r her Evaluati n The normal ADS valve actuating medium is supplied by the CN system.If CN pressure to the ADS valves falls to less than 160 psig, the CN supply is automatically isolated, and CIA-PCV-2A and-2B function to regulate backup nitrogen to ADS subsystems A and B from pressurized bottles in the CIA system.Of these two supplies, the CIA bottles (the backup supply)is a safety related system, and the CN system (the normal supply)is not safety related.Thus, the CIA supply must be operable to support ADS operability.
Therefore, this event rendered the four ADS valves in the B subsystem inoperable.
Immediately after discovery of the broken wire seal it was not recognized that the valve setpoint may have been changed, or that ADS operability had been affected.The setpoint of CIA-PCV-2B was not verified until approximately two days after discovery of the broken wire seal when necessary work documents were developed and approved.For purpose of this report, it is assumed that CIA-PCV-2B was misadjusted from the time of discovery of the broken wire seal to the time the valve was readjusted to the required value of 180 psig, a period of approximately 52 hours6.018519e-4 days <br />0.0144 hours <br />8.597884e-5 weeks <br />1.9786e-5 months <br />.TSAS 3.5.1.G requires the plant to be placed in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when two or more ADS valves are inoperable.
Therefore, this condition is reported per 10 CFR 50.73(a)(2)(ii) as a condition prohibited by Technical Specifications.
fACILITY NAME II)LICENSEE EVENT REPORT (LER)TEXT CONTINUATION DOCKET NUMBER I2)YEAR LER NUMBER I6)SEQUENTIAL NUNBER AsslISINt NUttBER PAGE I 3)Washington Nuclear Plant-Unit 2 50-397 97"00 3 OF 3 TEXT (If more space is required, use additional copies of NRC Form 366A)(17)~Root Caus Security and Operations have conducted an investigation into this event.It was revealed that this regulating valve was set to its required setpoint during CIA system startup during the last outage.No clear evidence of tampering since that time was found, and the cause of the misadjustment of CIA-PCV-2B is unknown.F rther rrec ive Ac ion Information concerning this event will be communicated to plant employees.
Guidance will be added to plant procedure(s) to specify that if there is reason to suspect a plant component is improperly configured, prompt corrective action will be taken to verify the proper configuration.
A e m n f fet ns uences The short term function of the ADS system is to provide post-LOCA vessel depressurization capability to permit use of the low pressure emergency core cooling system (ECCS)spray/injection subsystems for vessel injection.
This function was unaffected by CIA-PCV-2B being misadjusted because all seven ADS valves were supplied throughout the event by the normal nitrogen supply provided by the CN system, and each ADS valve is provided with a pressure accumulator which, if the nitrogen supply were to fail, would support the short term function of ADS by providing pressure for approximately five valve operations.
The long term function of the ADS system is to supply a flow path for alternate shutdown cooling.This would Jso be supported by the normal CN supply to the ADS valves.But, if the CN supply were to fail, nitrogen leakage from the ADS valve actuators and associated piping may be such that pressure in the accumulators would be insufficient to hold the ADS valves open for the long periods necessary to support the alternate shutdown cooling flow path.In the case of this event, the result of a CN failure would be that the four B system ADS valves would be unavailable for the long term function of alternate shutdown cooling, and only the three A subsystem ADS valves would be available to provide an alternate shutdown cooling flow path.However, analysis shows that only two ADS valves are required to provide a flow path for alternate shutdown cooling.Therefore, the long term function of ADS could be accomplished with the three valves in the A subsystem of ADS.Per this analysis, both the long term and short term functions of ADS would have been accomplished during the period when CIA-PCV-2B was set to 63 psig.Therefore, the safety significance of this event is minimal.Similar Event None
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