ML18041A190

Special Rept:On 890414,triaxial Time History Accelerometer Horizontal Trigger Circuits Identified as Inoperable. Caused by Incorrect Calibr Procedure.Surveillance Procedure Immediately Revised to Reflect Correct Setpoint Values

ML18041A190
Person / Time
Site:	Beaver Valley
Issue date:	04/24/1989
From:	NOONAN T P DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ND3MNO:1867, NUDOCS 8904280274
Download: ML18041A190 (8)

Text

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89/04/24NOTARIZED:

NODOCKETIFACIL:50-412 BeaverValleyPowerStation,Unit2,DuquesneLightC05000412AUTH.NAMEAUTHORAFFILIATION NOONAN,T.P.

DuquesneLightCo.RECIP.NAME RECIPIENT AFFILIATION DocumentControlBranch(Document ControlDesk)

SUBJECT:

Specialrept:on890414,triaxial timehistoryaccelerometer horizontal triggercircuitsidentified asinoperable.

DISTRIBUTION CODE:IE22DCOPIESRECEIVED:LTR ENCL(SIZE:TITLE:50.73/50.9 LicenseeEventReport(LER),IncidentRpt,etc.NOTES:LPDR 2cysTranscripts.

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PA15077~Telephone (412)393~April24,1989ND3MNO:1867BeaverValleyPowerStation,UnitNo.2DocketNo.50-412,LicenseNo.NPF-73SecialReortUnitedStatesNuclearRegulatory Commission DocumentControlDeskWashington

,DC20555Gentleman:

Inaccordance withAppendixA,BeaverValleyTechnical Specification 3.3.3.3,"SeismicInstrumentation,"

thefollowing SpecialReportissubmitted....

Thisreport.isrequiredwhentheconditions specified inTechnical Specification 3.3.3.3.b arenotsatisfied.

OnApril14,1989,2ERS-ACS-1 and-3,TriaxialTimeHistoryAccelerometer horizontal triggercircuitsfortheContainment Structure andtheSwitchyard, wereidentified asbeinginoperable sinceMay,1987,asaresultofanincorrect calibration procedure.

OnApril1,1989,aResponseSpectrumAnalyzerTroublealarmwasobserved, indicating aninternalfault.Amaintenance workrequestwasgenerated tocorrectthiscondition.

Duringtroubleshooting ofthecentralcontrolcabinet,withavendorrepresentative present,theseaccelerometer triggercircuitswereidentified ashavingincorrect setpoints.

Theaccelerometer analogtriggercircuitscausetaperecording ofallthreedirectional sensorinputsandannunciation, whenthesetpointvalueisreached.'he accelerometer triggercircuitcardscontainswitcheswhichprovideannunciation whentheirrespective setpointisreached.Thesetpoints arevaluesmeasureding-forces.

Itwasdiscovered thatthehorizontal triggersetpointvaluet0.0lg)forbothaccelerometer triggercardweresetatthe'vertical alarmswitchsetpointvalue(0.037g).

Thecauseforthiseventwasduetoadeficient surveillance procedure whichincorrectly specified thesetpointvalues.39042A0274 8904>4PDRADOCK050004i2PDr.

C April24,1989ND3MNO:1867 Page2Thesurveillance procedure wasimmediately revisedtoreflectthecorrectsetpointvaluesandtheaccelerometer triggercircuitswerecalibrated tothecorrectvalues.Therewerenosafetyimplications tothepublicasaresultofthiseventbecausenoseismicactivityoccurredduringtheentireperiodthehorizontal accelerometer triggercircuitswereincorrectly calibrated.

Thetriggercircuitsfunctiontoinitiateautomatic magnetictaperecording oftheseismicevent,nootherautomatic plantactuations aredesignedtooccurfromatriggercircuit.Inaddition, theverticalaccelerometer triggercircuitswerecorrectly calibrated andoperational throughout theentiretimeperiod.Verytrulyyours,T.P.NonanGeneralManagerNuclearOperations JT/cjAttachment

April24,1989ND3MNO:1867 PagethreeCC'r.WilliamT.RussellRegionalAdministrator UnitedStatesNuclearRegulatory Commission Region1KingofPrussia,PA19406C'.A.Roteck,OhioEdisonMr.PeterTam,BVPSLicensing ProjectManagerUnitedStatesNuclearRegulatory Commission Washington, DC20555J.Beall,NuclearRegulatory Commission, BVPSSeniorResidentInspector Mr.AlexTimme,CAPCONuclearProjectsCoordinator ToledoEdisonINPORecordsCenterSuite15001100Circle75ParkwayAtlanta,GA30339G.E.Muckle,FactoryMutualEngineering, Pittsburgh Mr.J.N.Steinmetz, Operating PlantProjectsManagerMidAtlanticArea.Westinghouse ElectricCorporation EnergySystemsServiceDivisionBox355Pittsburgh, PA15230AmericanNuclearInsurersc/oDottieSherman,ANILibraryTheExchangeSuite245270Farmington AvenueFarmington, CT06032Mr.RichardJanatiDepartment ofEnvironmental Resources P.O.Box206316thFloor,FultonBuildingHarrisburg, PA17120Director, SafetyEvaluation

&ControlVirginiaElectric&PowerCo.P.O.Box26666OneJamesRiverPlazaRichmond, VA23261 0