ML17037C254

Nine Mile Point Unit 1 - Letter Regarding the Analysis of the Capability of Unit 1 to Accommodate Anticipated Transients Without Scram and Advising That Reanalyses Have Been Initiated and Will Be Submitted by October 1, 1974

ML17037C254
Person / Time
Site:	Nine Mile Point
Issue date:	11/30/1973
From:	Schneider R R Niagara Mohawk Power Corp
To:	Anthony Giambusso US Atomic Energy Commission (AEC)
References
Download: ML17037C254 (6)

Text

j~lAECTRIBUTION FORPART50DOCKETRIAL,(TEMPORARY FORM)CONTROLNO:'ILE:8642CLASSUNCLASSXXXPROPINFOFROM:NiagaraMohawkPowerCorporation

Syracuse, N>Y.13202Mr.R.R.Schneider TO~A.Giambusso DATEOFDOC11-30-73ORIG1signedINPUTDATEREC'D12&-73CCOTHERNOCSPZC'DMEMORPTOTHERSENTAECPDRXXXSENTLOCALPDRDOCKETNO:50-220DESCRIPTION:

Ltrreour10-19-73ltr....concerning reanalyses oftheanticipated transients withscram,advthatthisstudyhasbeeninitiated andwillbesubmitted by10-1-74F, asrequested inourltr.ENCLOSURES:

'ACKNOWLEDGED

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N.Y.13202I9DFC,'43973I1973IL,Nygg,1ÃQ'~'~November30Mr.A.Giambusso DeputyDirectorforReactorProjectsDirectorate ofLicensing U.S.AtomicEnergyCommission Washington, D.C.20545

DearMr.Giambusso:

Re:NineMilePointUnit1DocketNo.50-22010lg'..app~IIIC5tg73IrppL1IppySNLpfp7(plkocEQgagOurapplication forconversion ofProvisional Operating LicenseNo.DPR-17toafull-term operating licenseincludedananalysisofthecapability ofNineMilePointUnit1toaccommodate anticipated transients withoutscram.Sincethetimeofthatsubmittal, certainchangeshavetakenplacewhichaffecttheanalysisofthesetransients andotheranticipated transients.

Theattachment toyourletterofOctober19,1973includedassumptions andcriteriatobeusedintheanalysisoftransients withoutscram.Theanalysiswhichwasincludedinourprevioussubmittal showedthatfortheworstcaseduringanticipated transients withoutscram,containment pressurecouldreach45psig.Thisexceedsthedesignpressureofthesuppression chamber.Theattachment toyourletterofOctober19,1973specified containment designpressureastheacceptable limit.LThepreviousanalyses'of othertransients whichincludescramwereperformed assumingnotrippingoftherecirculation pumps.Preliminary investi-gationsindicatethatincorporation ofatrippingofthepumpsonhighreactorpressureaggravates thesetransients.

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TQMr.A.Giambusso Becauseofthechangestotheanalysesasdescribed above,NiagaraMohawkconsiders thattheadditionoftherecirculation pumptripisnotjustified untilreanalyses ofanticipated transients withoutscramandothertransients arecompleted.

Therefore, thetn.poftFierecirculation pumpsonhighreactorpressureisbeingdeletedfromtheprotection systemcircuitry.

Thereanalyses oftheanticipated transients withoutscramhavebeeninitiated andwillbesubmitted byOctober1,1974asrequested intheattachment toyourletter.Verytrulyyours,udolph.SchnaderVicePresident

.-ElectricOperations CVM/sz

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