ML18030A295: Difference between revisions

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=Text=
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{{#Wiki_filter:~qq(2Sdy'~CFqqoq<UNITEDSTATESENVIRONMENTALPROTECTIONAGENCYREGiONIII6THANDWALNUTSTRS=TSPHlLADELPHIA.PENNSYLVANlA19306MAY28l981Zr.B.J.Youngblood,ChiefLicensingBranchNo.1DivisionofLicensingU.S.NuclearRegulatoryCommissionVashington,D.C.20555Mgh&auaueruran23fOA(2425$goN
 
==DearMr.Youngblood:==
WehavecompletedourreviewoftheSupplementtotheDraftEnvironmentalImpactStatementrelatedtotheoperationoftheSusquehannaSteamElectricStationUnits1and2;Weof'ferthefollowingcommentsforyourconsideration.TheCo~s~sonisto"becommendedfor'itsdecisiontopreparethisSuppleme'ntdiscussingtheenvironmentalandsocietalimpactsofacoremeltdownaccident.EPAhasemphasizedtheneedtoreviewanevaluationoftheenvironmentalimpactsresultingfromdifferentLWRaccidentscenariosincludingClass9accidents.TheassessmentofenvironmentalimpactsrelatingtosevereaccidentsattheplantemploysmethodsoriginallydevelopedintheReactorSafetyStudy(WASE-)400).Thesetwostudieswillbethebasisforsimilarenvironmentalassess"mentsofothernuclearpowerplantssothatwerecommendthatNRCrefertoEPA'soriginaltechnicalcommentsonthesestudies.Thecommentsareincludedinthepublication"ReactorSafetyStudy(VASE-1400):AReviewoftheFinalReportigandaletterfromEPA'sOfficeofFederalActivitiestoNRCdatedFebruary8p1977.TheTable6.1.4-4(p.6-26)shouldcorrespondonaone-to-onebasiswiththeaccidentsequenceorsequencegroupsofTable6.1.4-2(p.6-23).ThenotationsPN()relatingtothisTable(6.1.4-2)anddescribedinAppendix8needsclarification.Theuninitiatedreadingthis,webelievewouldbeveryconfused.Thediscussionofimpactsofinfrequentaccidentsandlimitingfaults,inboththeoriginalDESandtheSupplement,addressesprobabilitiesofoccurrencequalitatively.Znthediscussion,however,ofthemoreseverecoremeltacci-dents,theprobabilitiesofoccurrencearequantified(Table6.1.4-2).For6Pltuniformityinthepresentationofallenvironmentalrisks,theprobabilitiesofoccurrenceofinfrequentaccidentsandlimitingfaultsDesignBasisAccidentsshouldbeprovided.ZtisnotclearwhethertheriskslistedinTable6.1.4-3,Annual~AyerseValuesofEnvironmentalRisksDuetoAccidents,includethosefrominfrequentaccidentsgy060-O 0Isk''lh sandlimitingfaults(Table6.1.4-1),postulatedaccidents(Table6.2oftheoriginalDraftEnvironmentalImpactStatement),andaccidentsleadingtothesequencegroupslistedinTable6.1.4-2.TheFinalEnvironmentalImpactState-mentshouldincludeallrisksfrommoderatefrequencyaccidents,infrequentaccidents,ignitingfaultsaadseoerecoremeltaccidents.Theriskodthe~pp(~)infrequentaccidents,andlimitingfaultsis"fudgedtobeextremelysmall"butshouldbefullypresentedandnotovershadowedbytherisksfrom'coremeltaccidents.Therisksfromthemoreprobableyetlowerconsequenceaccidentsmayindeedbesignificanttotheindividualriskandshouldbelisted.ItwouldalsobeinformativetoextendFigures6.1.4-3and6.1.4-5toincludehigherprobabilityaccidents.ItwouldalsobehelpfultodevelopasummarytableoftheannualaveragevalueoftheenvironmentalrisksfromoperationofallthereactorsattheSusque-hannasitaTh.erisksshouldincludethosefromnormaloperations,moderatePPP(Q)frequencyaccidents,infrequentaccidents,limitingfaultsandseverecoremeltaccidents;societalandindividualrisksshouldalsobeaddressed.TheThree?file.Islan&2accilentdemonstrated'afactorthatsho'uldbeaddressed.Thecostofreactorbuildingdecontaminationandthereplacementpowereconomicshaveprovedtobeverysizeableitems.'hesefactorsaiesignificantandimportanttothebenefit-castanalysis.ThesefacesunderscoretheneedtoSPAdevelopstandardmethodsforestimatingthecontributionofthesecoststoeconomicrisks.ImpactStatementsorSupplementsshouldincludetheseeconomicsintheirbenefit-costbalance.C~+WewouldclassifythisdocumentinEPA'sReportingCategoryER-2.Thismeanswehavere'servationsconcerningthemannerinwhichtheaccidentsaretreatedandwealsobelieveadditionalclarificationisrequired.~~We'hankyouEortheopportunitytoreviewthedocumentandawaittheissuanceofthefinal.Sincerelyyours,eP=ohnR.PomponioChiefEIS&WetlandsReviewSection
}}

Revision as of 11:30, 20 April 2018

Provides Comments on Suppl to Des Re Operation of Facilities.Fes Should Include All Risks from Moderate Frequency Accidents,Infrequent Accidents,Limiting Faults & Severe Core Melt Accidents
ML18030A295
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 05/28/1981
From: POMPONIO J R
ENVIRONMENTAL PROTECTION AGENCY
To: YOUNGBLOOD B J
Office of Nuclear Reactor Regulation
References
NUDOCS 8106020488
Download: ML18030A295 (3)


Text

~qq(2Sdy'~CFqqoq<UNITEDSTATESENVIRONMENTALPROTECTIONAGENCYREGiONIII6THANDWALNUTSTRS=TSPHlLADELPHIA.PENNSYLVANlA19306MAY28l981Zr.B.J.Youngblood,ChiefLicensingBranchNo.1DivisionofLicensingU.S.NuclearRegulatoryCommissionVashington,D.C.20555Mgh&auaueruran23fOA(2425$goN

DearMr.Youngblood:

WehavecompletedourreviewoftheSupplementtotheDraftEnvironmentalImpactStatementrelatedtotheoperationoftheSusquehannaSteamElectricStationUnits1and2;Weof'ferthefollowingcommentsforyourconsideration.TheCo~s~sonisto"becommendedfor'itsdecisiontopreparethisSuppleme'ntdiscussingtheenvironmentalandsocietalimpactsofacoremeltdownaccident.EPAhasemphasizedtheneedtoreviewanevaluationoftheenvironmentalimpactsresultingfromdifferentLWRaccidentscenariosincludingClass9accidents.TheassessmentofenvironmentalimpactsrelatingtosevereaccidentsattheplantemploysmethodsoriginallydevelopedintheReactorSafetyStudy(WASE-)400).Thesetwostudieswillbethebasisforsimilarenvironmentalassess"mentsofothernuclearpowerplantssothatwerecommendthatNRCrefertoEPA'soriginaltechnicalcommentsonthesestudies.Thecommentsareincludedinthepublication"ReactorSafetyStudy(VASE-1400):AReviewoftheFinalReportigandaletterfromEPA'sOfficeofFederalActivitiestoNRCdatedFebruary8p1977.TheTable6.1.4-4(p.6-26)shouldcorrespondonaone-to-onebasiswiththeaccidentsequenceorsequencegroupsofTable6.1.4-2(p.6-23).ThenotationsPN()relatingtothisTable(6.1.4-2)anddescribedinAppendix8needsclarification.Theuninitiatedreadingthis,webelievewouldbeveryconfused.Thediscussionofimpactsofinfrequentaccidentsandlimitingfaults,inboththeoriginalDESandtheSupplement,addressesprobabilitiesofoccurrencequalitatively.Znthediscussion,however,ofthemoreseverecoremeltacci-dents,theprobabilitiesofoccurrencearequantified(Table6.1.4-2).For6Pltuniformityinthepresentationofallenvironmentalrisks,theprobabilitiesofoccurrenceofinfrequentaccidentsandlimitingfaultsDesignBasisAccidentsshouldbeprovided.ZtisnotclearwhethertheriskslistedinTable6.1.4-3,Annual~AyerseValuesofEnvironmentalRisksDuetoAccidents,includethosefrominfrequentaccidentsgy060-O 0Isklh sandlimitingfaults(Table6.1.4-1),postulatedaccidents(Table6.2oftheoriginalDraftEnvironmentalImpactStatement),andaccidentsleadingtothesequencegroupslistedinTable6.1.4-2.TheFinalEnvironmentalImpactState-mentshouldincludeallrisksfrommoderatefrequencyaccidents,infrequentaccidents,ignitingfaultsaadseoerecoremeltaccidents.Theriskodthe~pp(~)infrequentaccidents,andlimitingfaultsis"fudgedtobeextremelysmall"butshouldbefullypresentedandnotovershadowedbytherisksfrom'coremeltaccidents.Therisksfromthemoreprobableyetlowerconsequenceaccidentsmayindeedbesignificanttotheindividualriskandshouldbelisted.ItwouldalsobeinformativetoextendFigures6.1.4-3and6.1.4-5toincludehigherprobabilityaccidents.ItwouldalsobehelpfultodevelopasummarytableoftheannualaveragevalueoftheenvironmentalrisksfromoperationofallthereactorsattheSusque-hannasitaTh.erisksshouldincludethosefromnormaloperations,moderatePPP(Q)frequencyaccidents,infrequentaccidents,limitingfaultsandseverecoremeltaccidents;societalandindividualrisksshouldalsobeaddressed.TheThree?file.Islan&2accilentdemonstrated'afactorthatsho'uldbeaddressed.Thecostofreactorbuildingdecontaminationandthereplacementpowereconomicshaveprovedtobeverysizeableitems.'hesefactorsaiesignificantandimportanttothebenefit-castanalysis.ThesefacesunderscoretheneedtoSPAdevelopstandardmethodsforestimatingthecontributionofthesecoststoeconomicrisks.ImpactStatementsorSupplementsshouldincludetheseeconomicsintheirbenefit-costbalance.C~+WewouldclassifythisdocumentinEPA'sReportingCategoryER-2.Thismeanswehavere'servationsconcerningthemannerinwhichtheaccidentsaretreatedandwealsobelieveadditionalclarificationisrequired.~~We'hankyouEortheopportunitytoreviewthedocumentandawaittheissuanceofthefinal.Sincerelyyours,eP=ohnR.PomponioChiefEIS&WetlandsReviewSection