Proposed Tech Specs Reducing Requirement for Low Pressurizer Water Level from 12 to 10.6% & Changing P-10 Permissive from 10 to 8% Power| ML17309A323 |
| Person / Time |
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| Site: |
Ginna  |
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| Issue date: |
01/19/1984 |
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| From: |
ROCHESTER GAS & ELECTRIC CORP. |
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| To: |
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| Shared Package |
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| ML17309A321 |
List: |
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| References |
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| NUDOCS 8401250282 |
| Download: ML17309A323 (8) |
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[Table view] |
Text
Attachment; ARemove3.1-4b3.1-4e3.5-3Insert3;1-4b3.1-4e3.1-4f3.5-38401250282840119,',"
PDRADQCK05000244.,'
"".PDR 3.1.1.5Pressurizer Wheneverthereactorisathotshutdownorcriticalthepressurizer shallhaveatleast100kwofheatersoperableandawaterlevelmaintained between10.6%and87%oflevelspan.Ifthepressurizer isinoperable duetoheaterorwaterlevel,restorethepressurizer tooperablestatuswithin6hrs.orhavetheRHRsysteminoperation withinanadditional 6hrs.,Bases:Theplantisdesignedtooperatewithallreactorcoolantloopsinoperation andmaintaintheDNBRabove1.30duringallnormal3.1-4bChangeNo.ggAmendment No.gP,gg,jfg>PROPOSED Temperature requirements forthesteamgenerator correspond withmeasuredNDTfortheshellandallowable thermalstressesinthetubesheet.Eachofthepressurizer codesafetyvalvesisdesignedtorelieve288,000lbs.perhr.ofsaturated steamatthevalvesetpoint.
Below350Fand350psiginthereactorcoolantsystem,the0residualheatremovalsystemcanremovedecayheatandtherebyIIcontrolsyst'mtemperature andpressure.
Ifnoresidualheatwereremovedbyanyofthemeansavailable, theamountofsteamwhichcouldbegenerated atsafetyvalvereliefpressurewouldbelessthanhalfthevalves'apacity.
Onevalve,therefore, providesadequatedefenseagainstoverpressurization.
Thepoweroperatedreliefvalves(PORVs)operatetorelieveRCSpressurebelowthesettingofthepressurizer codesafetyvalves.Thesereliefvalveshaveremotelyoperatedblockvalvestoprovideapositiveshutoffcapability shouldareliefvalvebecomeinoper-able.Theelectrical powerforboththereliefvalvesandtheblockvalvesiscapableofbeingsuppliedfromanemergency powersourcetoensuretheabilitytosealthispossibleRCSleakagepath.Therequirement that100kwofpressurizer heatersandtheirassociated controlsbecapableofbeingsuppliedelectrical powerfromanemergency busprovidesassurance thattheseheaterscanbeenergized duringoss ofoffsitepowercondition tomaintainnaturalcirculation athotshutdownandduring3.1-4eAmendment No.gP,gg,PROPOSED cooldown.
Thepressurizer lowlevellimitof10.6%is"the(3)levelbelowwhichtheheatersarede-energized topreventdamage.References (1)FSARSection14.1.6(2)FSARSection7.2.3(3)LetterfromL.D.White,Jr.toD.L.Ziemann,USNRC,datedOctober17,19793.1-4fPROPOSED TABLE3.5-1INSTRUMENT OPERATION CONDITIONS Page1of2NO.FUNCTIONAL UNITNO.ofMIN.MIN.NO.ofCHANNELSOPERABLEDEGREEOFCHANNELSTOTRIP***CHANNELS'REDUNDANCY PERMISSIBLE BYPASSCGNDITIONS 6OPERATORACTIONIFCONDITIONS OFCOLUMN3OR5CANNOTBEMET1.Manual2.NuclearFluxPowerRangelowsettinghighsetting3.NuclearFluxIntermediate Range222of4pawerrangechannelsgreaterthan8%F.P.(lawsettingonly)2of4powerrangechannelsgreaterthan8%F.P.MaintainhotshutdawnMaintainhotshutdawnMaintainhotshutdawn.
Note14.NuclearFluxSourceRange5.Overtemperature T1of2intermediate Maintainhotrangechygnelsgreatershutdown.
Notethan10amps.=1Maintainhotshutdown6.Overpawer
-TCOs7OQMgU~8.HiPressurizer PressureZawPressurizer PressureMaintainhotshutdawnMaintainhotshutdownMaintainhotshutdownPressurizer-Hi WaterLevelMaintainhotshutdawnLawFlowinoneloop(>50%F.P.)LowFlowbothloops(10-50%F.P.)3/loop2/loop(anyloop)3/loop2/loop(anyloop)MaintainhotshutdownMaintainhotshutdown Attachment BThecurrentspecification onpressurizer waterlevelstatesthatthepressurizer levelshallbemaintained between12and87%.Theupperlimitisbasedonahighleveltripsetpointwithsufficient margintoaccountforreference legheatup.Thereisnobasisforthe12%lowerlimit.Sincelowpressurizer heatersarede-energized at10.6%,amoreappropriate valuewouldbe10.6%.TheP-10permissive allowsmanualblockingoftheinter-mediaterangerodstop,theintermediate rangehighfluxtrip,andlowsetpointofthepowerrangehighfluxtripabove10%power.Thesetripsareusedtomitigatetheconsequences ofarodwith-drawaltransient fromsubcritical.
TheproposedTechnical Specification changewouldallowtheabovetripstobebypassed(blocked) at8%power.Thischangeisnecessary becauseP-7permissive isrequiredat8.5%power.SinceoneoftheinputstoP-7comesfromthesamepowerrangebistablethatsuppliesP-10,P-10mustbeactuatedat8%powertosatisfy'.
therequirements forP-7.P-7automatically unblocksthefollow-.ingreactortrips:2looplowflow,reactorcoolantpumpbusundervoltage, reactorcoolantpumpbusunderfrequency, pressurizer lowpressure, andturbinetripwithP-9.Thesetripsareassociated withthe130MWwhichistheupperlimitofheatremovalwhileonnaturalcirculation.
Theonlytransient analysiswhichusesthistripisaslowrodwithdrawal.
(Borondilutionisboundedbytheslowrodwithdrawal.)
TheonlyeffectofreducingP-10to8%wouldbethatarodwithdrawal accident(RWA)startingfrom8%wouldbeterminated byhighfluxandovertemperature Tversustheintermediate andreducedhighpowertrips.Anevaluation performed ontheRWAstartingfrom8%and10%forvariousreactivity insertion ratesshowsapproximately thesameDNBRwhentheRWAisinitiated from8%versus10%power.Further,thereissubstantial marginbetweentheDNBRforaRWAfrom10%andthelimitingRWAfrom100%power.TheDNBRforaRWAstartingfrom8%willalsobegreaterthantheDNBRforthelimitingRWAstartedfrom100%power.Therefore, reducingP-10to8%hasnegligible effectontheGinnaSafetyAnalysisandtheminimumDNBRforall..RWAsisunchanged.
Attachment CInaccordance with10CFR50.91,thesechangestotheTechnical Specifications havebeenevaluated againstthreecriteriatodetermine iftheoperation ofthefac'ility inaccordance withtheproposedamendment would:l.involveasignificant, increaseintheprobability orconsequences ofanaccidentpreviously evaluated; or2.createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated; or3.involveasignificant reduction inamarginofsafety.Asoutlinedbelow,Rochester GasandElectricsubmitsthattheissuesassociated withthisamendment requestareoutsidethecriteriaof10CFR50.91,andtherefore, anosignificant hazardsfindingiswarranted.
Theproposedchangewouldreducethelowerpressurizer level'.limitfrom12to10.6%.Thisdoesnotincreasetheprobability o'consequences ofanaccident.
Thisdoesnotcreateanewordifferent accident.
Thisdoesnotreduceasafetymargin.TheproposedchangealsoreducestheP-10setpointfrom10to8%.Theevaluation doneshowsthatforthelimitingaccidents, thesafetymarginisnotsignificantly reduced.Thischangedoesnotincreasetheprobability orconsequences ofanaccident.
Thischangesdoesnotcreateanewordifferent accident.
Therefore, anosignificant hazardsfindingiswarranted fortheproposedchanges.
1p~04i4