ML15349A808
| ML15349A808 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/30/2015 |
| From: | Craft W Dominion Resources Services |
| To: | Richard Guzman Plant Licensing Branch 1 |
| Guzman R | |
| References | |
| TAC MF6251 | |
| Download: ML15349A808 (1) | |
Text
1 Guzman, Richard From:
Wanda D Craft (Generation - 6) <wanda.d.craft@dom.com>
Sent:
Tuesday, June 30, 2015 10:23 AM To:
Guzman, Richard Cc:
John Harrell (Generation - 6)
Subject:
[External_Sender] Information related to MPS3 LAR to Adopt Dominion Core Design and Safety Analysis Methods Categories:
Followup
- Rich, TheNAFgroupdiscoveredadiscrepancybetweentheMPS3RETRANBaseModelPressurizerShellHeatConductorand theDominionRETRANTopicalReportthispastweekend(June27/28).TheMPS3RETRANbaseinputdeckmodelsthe pressurizershellasaheatconductor,whichdiffersfromTopicalReportVEPFRD41.VEPFRD41states,Dominion continuestomodelthenonequilibriumwallasanadiabaticsurface.
Thismodelisnotusedinanyanalysesofrecord,sothisdiscrepancyhasnoimpactonplantlicensingor operations.However,theRETRANbasemodelwasusedtobenchmark/replicateWestinghouseanalysesofrecordin supportofthesubjectLARsubmittedonMay8,2015forgenericNRCapprovalofapplicationofDominionreloaddesign analysismethodstoMPS3.EachofthefivebenchmarkingcasessupportingtheMay8,2015LARwerererunwiththe neededcorrection.ThisresultedineitheressentiallynodifferenceorimprovedreplicationoftheWestinghouseanalysis ofrecordresults(i.e.inthecaseoftheofthepredictedpressurizerwatervolumeforthelossofnormalfeedwater benchmark).
ThisinformationwasnotknownatthetimeofourJune25clarificationcall.Weanticipatethatmodifiedgraphsandtext fortheaffectedLossofNormalFeedwaterbenchmarkcaseintheLARmaybeneededbytheNRCtechreviewerto completehisreviewoftheLAR,andthathemaywishforustoprovidethisadditionalinformationinconjunctionwith responsestoforthcomingRAIs.
ACRisbeingwrittentodocumentthisissue.Iwillbehappytosendyouacopyafterithasbeensubmitted.Ifyouhave anyquestions,pleaseletmeknow.Weareavailabletodiscussthisatanytime.Thanks.
Wanda D. Craft Nuclear Licensing and Operations Support Dominion Resources Services, Inc (804) 273-4687 tie-line 730-4687
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