ML17037C461

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Nine Mile Point Nuclear Station, Unit 1 - Letter Transmitting Amendment to the Operating License Consisting of Changes to the Technical Specifications. Changes Increase the Safety Margin for the Isolation Function for the Emergency Condense
ML17037C461
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 09/25/1974
From: Thomas E B
LeBoeuf, Lamb, Leiby & MacRae, Niagara Mohawk Power Corp
To:
US Atomic Energy Commission (AEC)
References
Download: ML17037C461 (12)


Text

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ARVINE.UPTONEUGENEB~THOMASrJR.LEONARDM.TROSTENHARRYH.VOIGTLEXK.LARSONWASHINOTDN PARTNCRS~~t"UtSheOact(eIFI.AWOFFICESOFLEBOEUF,LAMB,LEIBY8(,MACRAEI767NSTREETrN.W.WAsHINGTQN, D.C.20036September 25,1974ONECHASEMANHATTAN PLAZANCWYORK,N.Y.IODOSWASHINOTDN TCLCPHDNC ZOZ8788BBBCADLCADDRESSLALALVrWASNINOTDN D.C.DirectorofLicensing U.S.AtomicEnergyCommission Washington, D.C.20545P'CPS/(~Re:NiagaraMohawkPowerCorporation DocketNo.50-220Provisional 0eratinLicenseDPR-17

DearSir:

AscounselforNiagaraMohawkPowerCorporation, weherebytransmitthree(3)originals andnineteen(19)copiesofanApplication forAmendment.

totheProvisional Operating Licenseintheabove-captioned docket.Accompanying thisapplication areforty(40)copiesofadocumententitled, "Proposed ChangesinTechnical SpecificationsN

.ThesechangestotheTechnical Specifications areproposedinaccordance withtherequirements ofSections50.59(c)and50.90oftheCommission's RulesandRegulations.

Theywouldincreasethesafetymarginfortheisolation functionfortheemergency condensers.

rVerytrulyyours,LeBOEUF,LAMB,LEIBY&MacRAEEnclosures

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ridCL@IIIotByEugeneB.Thomas,Jr.Partner

/ifr)i'Ir4 (cBEFORETHEUNITEDSTATESATOMICENERGYCOMMISSION IntheMatterof))NIAGARAMOHAVKPOliERCORPORATION

)(NineMilePointUnit1))DocketNo.50-220c8APPLICATION FORPZKNDMENT TO~pgg)97/Q$WO;g8liRQTCOtk~AhSIO.I R.:gu,atÃ1 gsllgcctlroPROVISIONAL OPERATING LICENSENiagaraMohawkPowerCorporation, Licenseeintheabove-captioned docket,herebyfilesanApplication forAmendment toitsProvisional Operating LicenseDPR-17.ThisAmendment wouldchangetheTechnical Specifications withrespecttotheset-point forhighsteamflowintheemergency coolingsystem.h'iththisApplication forAmendment, Licenseeherebytransmits adocumententitled"Proposed ChangetoTechnical Specifications" describing thechangeandthereasonstherefore.

TheproposedchangehasbeenreviewedandapprovedbytheSafetyReviewandAuditBoardandtheSiteOperations ReviewCommittee.

%1EREFORE, LicenseepraysasinitsoriginalApplication forLicenses.

Respectfully submitted, NIAGARAH011AVKPOWERCORPORATION PhilipD.RaymondVicePresident-Engineering Subscribed andsworntobeforemethis<<-dayofSeptember, 1974.HELJ.CARRICKNotaryPublicinthoStateofNewYorkQualified inOnon.Co.No.452w4b0hlyt.'~~nis~unxxpirusbsarch30,19'7A

~~l'<f't,v~V~...';~~"1'e'l4La'i~g'a'~I ProposedChangestoTechnical Specifications ProposedchangestotheTechnical Specifications wouldincreasesafetymarginfortheisolation functionfortheemergency condensers.

Theoriginalsetpointforhighsteamflowintheemergency coolingsystemsupplylinewas<29.5psid.Thatsetpointwasestablished onthebasisofashortradiuselbowinstallation.

Afterinitialoperation, acheckofthefabrication drawingsandfieldmeasurements indicated thatalongradiuselbowwasactuallyinstalled.

Arecalculation resultsinarevisedsetpointof19psidrepresenting aflowof291percentofmaximumdesigncapacity.

Thisrevisedsetpointprovidessufficient capability toisolatetheemergency condensers onhighflowduetoalinebreak.Alsosufficient marginexistssuchthattheunitwillnottripduringnormaloperation.

Thehighflowusedforthiscalculation isequivalent toaruptureof30percentofthepipecross-sectional area.

0J NIAGARAHOEKRVPOWERCORPORATION LicenseNo.DPR-17DoclcetNo.50-220ProosedChanetoTechnical Secifications ItemLocation~ChaneBasisforSection3.6.2Page95Changethefourthandfifthsentences inthefirstparagraph toreadasfollows:"Thehighflowsetpointfortheemergency coolingsystemsupplylineis19psidifferential.

Thisrepresents aflowofapproximately 8.7x105poundsperhouratratedcondition."

Table3.6.2cand4.6.2cPage102Changethesetpointunderiten(3)NighSteamFlowEmergency CoolingSystemto19psidCrom<29.5psid.

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