RG1.135 正常液位及排放 1977

U.S.NUCLEARREGULATORYCOMMISSION4REGULATORYGUIDE,OFFICEOFSTANDARDSDEVELOPMENTREGULATORYGUIDE1.135NORMALWATERLEVELANDDISCHARGEATNUCLEARPOWERPLANTSA.INTRODUCTIONGeneralDesignCriterion2,DesignBasesforProtectionAgainstNaturalPhenomena,ofAppendixA,GeneralDesignCriteriaforNuclearPowerPlants,to10CFRPart50,LicensingofProductionandUtilizationFacilities,requiresthatstructures,systems,andcomponentsimportanttosafetybedesignedtowithstandtheeffectsofnaturalphenomenasuchasfloods,tsunami,andseicheswithoutlossofcapabilitytoperformtheirsafetyfunctions.Criterion2alsorequiresthatdesignbasesforthesestructures,systems,andcomponentsreflect:1.Appropriateconsiderationofthemostsevereofthenaturalphenomenathathavebeenhistoricallyreportedforthesiteandsurroundingregion,withsufficientmarginforthelimitedaccuracyandquantityofthehistoricaldataandtheperiodoftimeinwhichthedatahavebeenaccumulated,2.Appropriatecombinationsoftheeffects,,ofn6malandaccidentconditionswiththeeffectsofthe'.naturalphenomena,and...3.Theimportanceofthesafetyfurfonsi6beperformed.Paragraph100.1rbftOCFRPart100,ReactorSiteCriteria.requit'[k.,ysicalcharacteristicsofthesite,Inc]Ieilo&g'meteorology,geology,andhydroy,bke-intoaccountindeterminingtheac.ta'tyo',siteforanuclearpowerreactor.ThuidesetsforthmethodsacceptabletotheNRCffordeterminingnormalgroundandsurfacewatrlevelsandsurfacewaterdischargesforuseinanalysesofthe.effectofdesignbasisnaturalandaccidentaleventsonstructuresandsystemsatnuclearpowerplants.Thisguidealsosuggestsdatasourcesandacceptablemethodsfordeterminingsuchwaterlevelsanddischarges.B.DISCUSSIONSomestructuresandsystems..'Mnostnuclearpowerplantsarecontinuallysuifouctuatingliveloadsthatresultfromvariionsioundwaterlevels,discharges-ldaIsisn'treams,orwaterlevelsinlakesaniducturesthatextendbelowgrousdsurfac~ntothelocalgroundwateraquifer-(o1ý`1#Aifersmustwithstandtheresultinghydftaticýressti'e.Structuresthatareaffectedb1:.zurfhceý*atetdischargesandlevelsincludedamss,6-.,a;aters,canals,andintakeanddiscl*4esc.cids.Inconsideringtheeffectsofdesignbaseientsiuchasearthquakes,tornadoes,andhurricwsnt&;andtheeffectsofdesignbasisaccidentaleffVw,'tssuchasplanecrashes,transportationacci.dents,explosions,fires,andloss-of-coolantaccidents(LOCAs),thedesignermustincludeinhiscalculationstheloadscausedbythewaterlevel(ordischarge),aswellastheloadonthestructureorsystemcausedbythedesignbasiseventbeingconsidered.Thiswaterlevel(ordischarge)isreferredtointhisguideasthenormalwaterlevel(ordischarge).Sincethedesignbasiseventshaveaverylowprobabilityofoccurrence,thewaterlevel(ordischarge)usedincombinationwiththedesignbasiseventneednotrepresentaconditionwithlowDesignbasiseventsarethosenaturaleventsthatthereisvirtuallynoriskofexceeding,suchastheProbableMaximumHurricane,SafeShutdownEarthquake,andothernaturaleventsofsimilarlowprobabilityofoccurrence,andaccidentalevents,suchasexplosions,planecrashes,andfires.USNRCREGULATORYGUIDESCommentsshouldbesenttotheSecretaryoftheCommission.US.NuclearReguRegulatoryGuidesareissuedtodescribeandmakeavailabletothepublicmethodslatoryCommission,Washington.D.C.20555,Attention.DocketingandServiceacceptabletotheNRCstaffofimplementingspecificpartsoftheCommission'sBranch.regulations,todelineatetechniquesusedbythestaffinevaluatingspecificproblemsorpostulatedaccidents,ortoprovideguidancetoapplicants.RegulatoryGuidesTheguidesareissuednthefollowingtenbroaddivisionsarenotsubstitutesforregulations,andcompliancewiththemisriotrequired1.PowerReactors6.ProductsMethodsandsolutionsdifferentfromthosesetoutintheguideswillbeaccept-2.ResearchandTestReactors7.Transportationableiftheyprovideabasisforthefindingsrequisitetotheissuanceorcontinuance3.FuelsandMaterialsFacilities8.OccupationalHealthofapermitorlicensebytheCommission.4.EnvironmentalandSiting9.AntitrustReviewB.MaterialsandPlantProtectiontO.GeneratCommentsandsuggestionsforimprovementsintheseguidesareencouragedatalltimes,andguideswillberevised,asappropriate,toaccommodatecommentsandRequestsforsinglecopiesofissuedguides(whichmaybereproduced)orforplace.toreflectnewinformationorexperience.However,commentsonthisguide,ifmentonanautomaticdistributionlistforsinglecopiesuffutureguidesinspecificreceivedwithinabouttwomonthsafteritsissuance,willbeparticularlyusefulindivisionsshouldbemadeinwritingtotheUS.NuclearRegulatoryCommision.evaluatingtheneedforanearlyrevision.Washington,D.C.20555,Attention:Director.DivisionofDocumentControl.September1977probabilityofoccurrence.Asusedinthisguide,thetermnormalwaterlevel(ordischarge)meansthatwaterlevel(ordischarge)thathasaprobabilityofapproximately0.5ofoccurrenceatthetimeofinterest.Somedesignbasiseventsmayactuallyconsistofaseriesofeventssuchasanearthluakefollowedbyoneormoreaftershocks.Thisfactisimportantiftheearthquakecouldaffectthenormalwaterlevel(ordischarge)andresultinadifferentwaterlevel(ordischarge)whentheaftershocksoccur.Forexample,theinitialearthquakecouldaffectanunderdrainsystemtolowergroundwaterlevelsattjhetimeoftheaftershocks.Similarly,adamfailurecausedbytheinitialearthquakecouldsubstantiallychang