ML24102A068
| ML24102A068 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/10/2024 |
| From: | John Klos Plant Licensing Branch II |
| To: | Geoffrey Miller Dominion Energy Virginia, Virginia Electric & Power Co (VEPCO) |
| Klos, J | |
| References | |
| Download: ML24102A068 (2) | |
Text
1 John Klos From:
John Klos Sent:
Wednesday, April 10, 2024 9:40 AM To:
gary.d.miller@dominionenergy.com Cc:
Subject:
Surry IST (z)(2) hardship RR V-1 RCS Cold Leg, LH Safety Injection Check Valves, RAI issuance due to NRC May 10 2024
- Gary, The RAIs below are now issued officially, and the response due date is May 10, 2024.
=
Background===
ByleerdatedOctober12,2023(AgencywideDocumentsAccessandManagementSystemAccessionNo.
ML23285A092),VirginiaElectricandPowerCompany(DominionEnergyVirginia)submiedAlternaveRequestV1for authorizaonbytheU.S.NuclearRegulatoryCommission(NRC),pursuanttoTitle10oftheCode of Federal Regulaons (10CFR)50.55a(z)(2),tospeci"crequirementsoftheAmericanSocietyofMechanicalEngineers(ASME)Operaon and Maintenance of Nuclear Power Plants,Division1,OMCode:SeconIST(OMCode)associatedwithinservicetesng(IST) forcertaincheckvalvesatSurryPowerStaon(SPS),Units1and2.
RegulatoryRequirements TheNRCregulaonsin10CFR50.55a(f)(4),Inservice tesng standards requirement for operang plants, state,inpart, that throughouttheservicelifeofaboilingorpressurizedwatercoolednuclearpowerfacility,pumpsandvalvesthat arewithinthescopeoftheAmericanSocietyofMechanicalEngineers(ASME)Operaon and Maintenance of Nuclear Power Plants,Division1,OMCode:SeconIST(OMCode)mustmeettheinservicetestrequirements(exceptdesign andaccessprovisions)setforthintheASMEOMCodeandaddendathatbecomeeecvesubsequenttoedionsand addendaspeci"edinparagraphs10CFR50.55a(f)(2)and(3)andthatareincorporatedbyreferenceinparagraph10CFR 50.55a(a)(1)(iv),totheextentpraccalwithinthelimitaonsofdesign,geometry,andmaterialsofconstruconofthe components.
TheNRCregulaonsin10CFR50.55a(z),Alternaves to codes and standards requirements,states:
Alternavestotherequirementsofparagraphs(b)through(h)ofthisseconorporonsthereofmaybeusedwhen authorizedbytheDirector,OceofNuclearReactorRegulaon.Aproposedalternavemustbesubmiedand authorizedpriortoimplementaon.Theapplicantorlicenseemustdemonstratethat:
(1)Acceptable level of quality and safety. Theproposedalternavewouldprovideanacceptablelevelofquality andsafety;or
(2)Hardship without a compensang increase in quality and safety. Compliancewiththespeci"edrequirements ofthisseconwouldresultinhardshiporunusualdicultywithoutacompensangincreaseinthelevelof qualityandsafety.
RequestsforAddionalInformaon(RAIs)
EMIBRAI1:
Secon6.AofAlternaveRequestV1referstovendorguidancetorebuild6Velanswingcheckvalves.Aachment2, EngineeringAssessmentofMechanicalAgitaonProcessforSixInchVelanPressureIsolaonValves,tothelicensees submialisscopedfor6VelanPressureIsolaonValves.However,Secon1ofAlternaveRequestV1doesnot
2 specifythetypeofcheckvalvewithinthescopeofthisrequest.Thelicenseeisrequestedtocon"rmthatthescopeof thecomponentsinthisrequestareonly6Velanswingcheckvalves,orprovideaddionaldetailsregardingthe componentswithinthescopeofthisrequest.
EMIBRAI2:
Thecitedprecedent(SequoyahUnit1and2,ML22263A375)forAlternaveRequestV1includesaddionalcontrolsfor mechanicalagitaonofcheckvalvesthatdonotappearpresentinthisrequest.Forexample,thecontrolsinthe precedentrequirethattheimpactsurfaceofthetoolshouldberelavelylarge(greaterthan1/2diameterispreferred) andapproximately"atorslightlyrounded.Ifavailable,arubbercoatedtoolmaybeused.Thosecontrolsalsospecify thatthetoolwillnotimpactthebodywithanedgeorsharppoint.Further,thecontrolsspecifythatagitaonshouldbe appliedincrementallystarngwithminimalforceandmaybeappliedtodierentlocaonsonthebody.Inorderto preventdamagetothevalveorinjurytopersonnel,thelicenseeisrequestedtoprovideaddionalguidancetothis extentwithinAlternaveRequestV1andallguidanceshouldbelistedinsequenceforbeerimplementaon.
EMIBRAI3:
Secon6.AofAlternaveRequestV1isentledReviewofMaintenanceHistoryforValvesinSecon1,butthe discussionfocusesonleakagetesngresultsforthesubjectcheckvalves.Thelicenseeisrequestedtoprovide informaonregardingthemaintenancehistoryofthecheckvalvesinaddiontotheleakagetesngresults,tosupport theasseronthatthesecheckvalveshaveahistoryofgoodperformance.Forexample,thecitedprecedentdiscussed visualinspeconresultsandfreedomofmovementchecksoftheapplicablecheckvalves.Inaddion,thelicensee shoulddiscussanysigni"cantmaintenanceacviesforthecheckvalveswithinthescopeofAlternaveRequestV1, suchaslessonslearneddescribedinNRCInspeconReport05000281/2020040datedDecember30,2020 (ML20365A007).
Thanks in advance, John Klos DORL Mcguire, Surry Licensing Project Manager U.S. NRC, Office of Nuclear Reactor Regulation (NRR),
Division of Operating Reactor Licensing (DORL),
NRC/NRR/DORL/LPL2-1, MS O8B01, O8B03 Washington, DC 20555-0001 301.415.5136, John.Klos@NRC.gov
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