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| {{#Wiki_filter:DEMONSTRATION OFTHECONFORMANCE OFEXXONNUCLEARCOMPANYFUELTOTHEWESTINGHOUSE K(Z)OPERATING ENVELOPEFORTHEROBERTE.GINNANUCLEARPOWERPLANTWestinghouse ElectricCorporation NuclearTechnology DivisionNuclearSafetyDepartment Safeguards Engineering andDevelopment September 19858512200249 851216PDRADOCK05000244',P'DR I.ntroduction Thisdocumentreportstheresultsofasensitivity studythatwasperformed inordertodemonstrate conformance ofExxonNuclearCompanynuclearfuelintheRobertE.GinnanuclearpowerplanttotheWestinghouse K(z)operating envelope. | | {{#Wiki_filter:DEMONSTRATION OF THE CONFORMANCE OF EXXON NUCLEAR COMPANY FUEL TO THE WESTINGHOUSE K(Z)OPERATING ENVELOPE FOR THE ROBERT E.GINNA NUCLEAR POWER PLANT Westinghouse Electric Corporation Nuclear Technology Division Nuclear Safety Department Safeguards Engineering and Development September 1985 8512200249 851216 PDR ADOCK 05000244', P'DR I.ntroduction This document reports the results of a sensitivity study that was performed in order to demonstrate conformance of Exxon Nuclear Company nuclear fuel in the Robert E.Ginna nuclear power plant to the Westinghouse K(z)operating envelope.In particular, the results of.this analysis show that for skewed to the top power shapes, in addition to the power shape peaked at the mid-core elevation, that the worst peak cladding temperature (PCT)in the unlikely event of a Loss-Of-Coolant-Accident (LOCA)remains below the 2200 deg-F limit as specified by Appendix K of 10CFR50.46. |
| Inparticular, theresultsof.thisanalysisshowthatforskewedtothetoppowershapes,inadditiontothepowershapepeakedatthemid-coreelevation, thattheworstpeakcladdingtemperature (PCT)intheunlikelyeventofaLoss-Of-Coolant-Accident (LOCA)remainsbelowthe2200deg-Flimitasspecified byAppendixKof10CFR50.46.
| | II.Method of Anal sis The sensitivity study was performed using the LOCTA computer code of the Westinghouse 1981 Large Break LOCA Evaluation Model (WEM)to calculate the PCT for Exxon fuel for three power shapes.The power.shapes investigated I were peaked at 6.0 ft., 8.0 ft., and at 10.5 ft.The power shapes used in the LOCA analyses are shown in Figures 1-3.The peak power of each power shape is limited by the current K(z)envelope for the Robert E.Ginna (RGE)power plant.The current K(z)envelope for RGE assumes a maximum total peaking factor of 2.32, and a hot channel enthalpy rise factor of 1.66. |
| II.MethodofAnalsisThesensitivity studywasperformed usingtheLOCTAcomputercodeoftheWestinghouse 1981LargeBreakLOCAEvaluation Model(WEM)tocalculate thePCTforExxonfuelforthreepowershapes.Thepower.shapesinvestigated Iwerepeakedat6.0ft.,8.0ft.,andat10.5ft.ThepowershapesusedintheLOCAanalysesareshowninFigures1-3.ThepeakpowerofeachpowershapeislimitedbythecurrentK(z)envelopefortheRobertE.Ginna(RGE)powerplant.ThecurrentK(z)envelopeforRGEassumesamaximumtotalpeakingfactorof2.32,andahotchannelenthalpyrisefactorof1.66. | |
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| Thefueldesignparameters fortheExxonfuelwereobtainedfromtheExxonNuclearCompanythroughathree-party proprietary agreement betweenWestinghouse, Rochester Gas6Electric, an'dExxon.Thefuelparameters specifictoeachpowershapeweregenerated byExxonandtransmitted toWestinghouse.
| | The fuel design parameters for the Exxon fuel were obtained from the Exxon Nuclear Company through a three-party proprietary agreement betweenWestinghouse, Rochester Gas 6 Electric, an'd Exxon.The fuel parameters specific to each power shape were generated by Exxon and transmitted to Westinghouse. |
| Thefuelparameters, whichincludedfuelpellettemperatures andgappressures, werethenusedasinputineachoftheLOCTAcalculations.
| | The fuel parameters, which included fuel pellet temperatures and gap pressures, were then used as input in each of the LOCTA calculations. |
| TheresultsoftheLOCTAcalculations aresummarized inthefollowing table:'IComarisonofExxonFuelPeakCladdinTemeraturesPowerShapePeakPCTOFPCTElevation PCTTimesec.6~08'10'1781159815287.257'510.001065..14'Theseresultsdemonstrate thatfortheRobertE.GinnaUnit,thatthechoppedcosinepowershape(i.e.6.0ft.peakedshape)generates themostlimitingpeakcladtemperature.
| | The results of the LOCTA calculations are summarized in the following table: 'I Com arison of Exxon Fuel Peak Claddin Tem eratures Power Shape Peak PCT OF PCT Elevation PCT Time sec.6~0 8'10'1781 1598 1528 7.25 7'5 10.00 106 5..1 4'These results demonstrate that for the Robert E.Ginna Unit, that the chopped cosine power shape (i.e.6.0 ft.peaked shape)generates the most limiting peak clad temperature. |
| Figures4-6showthecladtemperature responseforthepeaknodeforthe6.0,8.0,and10.5ft.powershapesrespectively.
| | Figures 4-6 show the clad temperature response for the peak node for the 6.0, 8.0, and 10.5 ft.power shapes respectively. |
| Animportant observation oftheseresultsisthatforthetop-skewed shapes,thepeakcladdingtemperature occursduringtheblowdownphase.Thisisimportant becausemostoftheAppendixKprescribed analytical modelshavetheirgreatestinfluence duringtherefloodphase.Apeak
| | An important observation of these results is that for the top-skewed shapes, the peak cladding temperature occurs during the blowdown phase.This is important because most of the Appendix K prescribed analytical models have their greatest influence during the ref lood phase.A peak |
| '~cladtemperature whichoccursduringrefloodissensitive tocore-wide andsystem-wide hydraulic phenomena, whileablowdownpeakisastrongerfunctionofinitialfuelstoredenergy.Acomparison ofthepeakcladtemperatures duringtheblowdownandrefloodphasesforeachofthesepowershapesprovidesamoreconclusive demonstration thatthechoppedcosinepowershapeproducesthemostlimitingLOCAresults.ComarisonofPeakCladdinTemeraturesDurinBlowdownPowerShapePeakPCT-Blowdown opPCTElevation Timesec.6.08'10'1635159815286~007'510.005'5'4'Thecomparison ofpeakcladtemperatures duringblowdownshowsthatthehighestPCToccursforthechoppedcosinepowershape.Thisisreasonable., | | '~clad temperature which occurs during reflood is sensitive to core-wide and system-wide hydraulic phenomena, while a blowdown peak is a stronger function of initial fuel stored energy.A comparison of the peak clad temperatures during the blowdown and reflood phases for each of these power shapes provides a more conclusive demonstration that the chopped cosine power shape produces the most limiting LOCA results.Com arison of Peak Claddin Tem eratures Durin Blowdown Power Shape Peak PCT-Blowdown op PCT Elevation Time sec.6.0 8'10'1635 1598 1528 6~00 7'5 10.00 5'5'4'The comparison of peak clad temperatures during blowdown shows that the highest PCT occurs for the chopped cosine power shape.This is reasonable., because 6.0 ft.shape permits the highest total local peaking factor (2.32).The fact that the PCT for the top-skewed shapes occurs below the peak power location is due to the better heat transfer at higher elevations that occurs during the period of negative core flow. |
| because6.0ft.shapepermitsthehighesttotallocalpeakingfactor(2.32).ThefactthatthePCTforthetop-skewed shapesoccursbelowthepeakpowerlocationisduetothebetterheattransferathigherelevations thatoccursduringtheperiodofnegativecoreflow.
| | Com arison of Peak Claddin Tem eratures Durin Reflood Power Shape Peak PCT-Reflood OF PCT Elevation Time sec.6~0 8~0 10'1781 1585 1458 7'5 F 00 10.00 106 74 68 The comparison of reflood peak clad temperatures shows an even wider margin between the chopped cosine shape and the top-skewed power shapes.Zn addition to showing that the chopped cosine power shape, is the"worst" power shape for a LOCA analysis of RGE with Exxon fuel, it also demonstrates a large margin to the 2200 deg-F limit for the top-skewed shapes for this plant.III.Use of Non-Exxon Fuel H draulics This sensitivity study was performed by re-calculating the clad V I temperature response for Exxon for the three power shapes using the LOCTA computer code.The hot assembly hydraulics was not re-calculated for the Exxon fuel.The blowdown and reflood hydraulic transients are generated using the SATAN, WREFLOOD and COCO computer codes.Existing blowdown and reflood hydraulics from a previous RGE plant specific analysis with W-OFA fuel were used as hot assembly boundary conditions for the LOCTA calculations. |
| ComarisonofPeakCladdinTemeraturesDurinRefloodPowerShapePeakPCT-Reflood OFPCTElevation Timesec.6~08~010'1781158514587'5F0010.001067468Thecomparison ofrefloodpeakcladtemperatures showsanevenwidermarginbetweenthechoppedcosineshapeandthetop-skewed powershapes.Znadditiontoshowingthatthechoppedcosinepowershape,isthe"worst"powershapeforaLOCAanalysisofRGEwithExxonfuel,italsodemonstrates alargemargintothe2200deg-Flimitforthetop-skewed shapesforthisplant.III.UseofNon-Exxon FuelHdraulicsThissensitivity studywasperformed byre-calculating thecladVItemperature responseforExxonforthethreepowershapesusingtheLOCTAcomputercode.Thehotassemblyhydraulics wasnotre-calculated fortheExxonfuel.Theblowdownandrefloodhydraulic transients aregenerated usingtheSATAN,WREFLOODandCOCOcomputercodes.Existingblowdownandrefloodhydraulics fromapreviousRGEplantspecificanalysiswithW-OFAfuelwereusedashotassemblyboundaryconditions fortheLOCTAcalculations.
| | Use of the OFA hydraulics are justifiable for this sensitivity study on the following basis: |
| UseoftheOFAhydraulics arejustifiable forthissensitivity studyonthefollowing basis:
| | (l)The W-OFA rod size is smaller than the Exxon rod size.This will result in a slower reflood of a full core of W-OFA fuel.Thus, for a given power shape, the use of the OFA core reflood rate provides a conservative'eflood rate for the Exxon fuel heat-up calculation. |
| (l)TheW-OFArodsizeissmallerthantheExxonrodsize.ThiswillresultinaslowerrefloodofafullcoreofW-OFAfuel.Thus,foragivenpowershape,theuseoftheOFAcorerefloodrateprovidesaconservative'eflood ratefortheExxonfuelheat-upcalculation. | | (2)Previous sensitivities with top-skewed power shapes in SATAN have hot shown a large effect on the end-of-blowdown fuel temperatures. |
| (2)Previoussensitivities withtop-skewed powershapesinSATANhavehotshownalargeeffectontheend-of-blowdown fueltemperatures. | | Thus, the use of SATAN chopped cosine power shape results for top-skewed LOCTA calculations can be considered sufficiently accurate for a rough sensitivity study.Because of the wide margin between the cosine and the top-skewed shape PCTs in this analysis, re-calculation of the SATAN transient is not expected to change the conclusions of this analysis.IV.Conclusions The Westinghouse Large Break LOCA Evaluation Model clad heat-up computer code, LOCTA, was used to analyze Exxon fuel for three power shapes.The results confirmed that the power shape peaked..at the center of the core produces the highest peak cladding temperature. |
| Thus,theuseofSATANchoppedcosinepowershaperesultsfortop-skewed LOCTAcalculations canbeconsidered sufficiently accurateforaroughsensitivity study.Becauseofthewidemarginbetweenthecosineandthetop-skewed shapePCTsinthisanalysis, re-calculation oftheSATANtransient isnotexpectedtochangetheconclusions ofthisanalysis. | | This result for the Exxon fuel is consistent with power shape studies performed by Westinghouse with the same computer codes for Westinghouse fuel.The results of this study demonstrate that the Exxon fuel in the Robert E.Ginna nuclear power plant conforms to the current operating K(z)envelope for top-skewed power shapes.While the entire transient was not recalculated for this analysis, a complete re-analysis would not be expected to change the conclusions of this sensitivity study.\ |
| IV.Conclusions TheWestinghouse LargeBreakLOCAEvaluation Modelcladheat-upcomputercode,LOCTA,wasusedtoanalyzeExxonfuelforthreepowershapes.Theresultsconfirmed thatthepowershapepeaked..at thecenterofthecoreproducesthehighestpeakcladdingtemperature. | | 0.0 3.0 4.25,.4.75 5.25 5.75-6.25 6.75 7.25 7.75 9.0 12.1.S 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 10.5 CORE HEIGHT (FEET)Figure 1.Axial Power Shape Peaked at 6.0 ft.(Chopped Cosine Power Shape) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.011.012.0 |
| ThisresultfortheExxonfuelisconsistent withpowershapestudiesperformed byWestinghouse withthesamecomputercodesforWestinghouse fuel.Theresultsofthisstudydemonstrate thattheExxonfuelintheRobertE.Ginnanuclearpowerplantconformstothecurrentoperating K(z)envelopefortop-skewed powershapes.Whiletheentiretransient wasnotrecalculated forthisanalysis, acompletere-analysis wouldnotbeexpectedtochangetheconclusions ofthissensitivity study.\
| | .5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.511.5 CORE HEIGHT (FEET)Figure 2.Axial Power Shape Peaked at 8.0 ft; 2.S 2.0 M~1.S C5 1.0.5.0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.011.012.0 |
| 0.03.04.25,.4.75 5.255.75-6.25 6.757.257.759.012.1.S4.04.55.05.56.06.57.07.58.010.5COREHEIGHT(FEET)Figure1.AxialPowerShapePeakedat6.0ft.(ChoppedCosinePowerShape) 0.01.02.03.04.05.06.07.08.09.010.011.012.0 | | .5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 1 1.5 CORE HEIGHT (FEET)Figure3.Axial Power Shape Peaked at 10.5 ft. |
| .51.52.53.54.55.56.57.58.59.510.511.5COREHEIGHT(FEET)Figure2.AxialPowerShapePeakedat8.0ft; 2.S2.0M~1.SC51.0.5.0.01.02.03.04.05.06.07.08.09.010.011.012.0 | | c~tlct l~clvbt tt~ov tv[5 tovlt 5vttl 51u0t O.~Cl (IC.C 0 tlte~Ovlt Svttl ll~0~vC 1[vt<<01~00 Iutlf i C 00 t'll I tl Jt~tot5 tll~I tW>.O C C 5'AO.O v o ltd.O 50vAO S<lvl~55C>Figure 4.Clad Temperature Response for PCT Location for the 6.0 ft.Power Shape. |
| .51.52.53.54.55.56.57.58.59.510.511.5COREHEIGHT(FEET)Figure3.AxialPowerShapePeakedat10.5ft. | | ~Oll~l C~Cllil Ct~00 lull tOOC~Swltl S'IUOt 0'OCClC O,O~Caa tOol~Ssstl CCAO Art.lllit.wOS 000~VOS'i~t CS lit l~City Sy$0 tll+l Vl C000.0 C\SSOO.O N X o l000.0 0.0 8 8 SINS ISCCI Figure 5.-Clad Temperature Response for PCT Location for 8.0 ft.Power Shape |
| c~tlctl~clvbttt~ovtv[5tovlt5vttl51u0tO.~Cl(IC.C0tlte~OvltSvttlll~0~vC1[vt<<01~00IutlfiC00t'llItlJt~tot5tll~ItW>.OCC5'AO.Ovoltd.O50vAOS<lvl~55C>Figure4.CladTemperature ResponseforPCTLocationforthe6.0ft.PowerShape. | | ~OltV<C, CIVVV t<<OV<Vt<VOVtV 5Vatt 5<VDV 0,~Ott<C 10.5 Vtvv VOvtV 5vVVt C<JD AVC.1t<<V,<<0< |
| ~Oll~lC~CllilCt~00lulltOOC~SwltlS'IUOt0'OCClCO,O~CaatOol~SsstlCCAOArt.lllit.wOS 000~VOS'i~tCSlitl~CitySy$0tll+lVlC000.0C\SSOO.ONXol000.00.088SINSISCCIFigure5.-CladTemperature ResponseforPCTLocationfor8.0ft.PowerShape | | VOD Ovv51~0.00<1<<Vtvv~O,DO A<~<W~0000.0 o 1500.0 X E<C o 1000.0 lr 0.0 CII<t<5CCI S g 8 Figure 6.Clad Temperature Response for PCT Location for the 10.5 ft.Power Shape-11}} |
| ~OltV<C,CIVVVt<<OV<Vt<VOVtV5Vatt5<VDV0,~Ott<C10.5VtvvVOvtV5vVVtC<JDAVC.1t<<V,<<0< | |
| VODOvv51~0.00<1<<Vtvv~O,DOA<~<W~0000.0o1500.0XE<Co1000.0lr0.0CII<t<5CCISg8Figure6.CladTemperature ResponseforPCTLocationforthe10.5ft.PowerShape-11}}
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LER 99-008-00:on 990427,overtemperature Delta T Reactor Trip Occurred Due to Faulted Bistable During Calibr of Redundant Channel.Plant Was Stabilized in Mode 3 & Faulted Bistable Was Subsequently Replaced.With 990527 Ltr
ML17265A6631999-05-24024 May 1999
LER 99-007-00:on 990423,technicians Inadvertently Pulled Fuses from Wrong Nuclear Instrument Cahnnel,Causing Reactor Trip,Due to High Range Flux Trip.Caused by Personnel Error. Labeling Scheme Improved
ML17265A6601999-05-21021 May 1999
LER 99-006-00:on 990421,start of turbine-driven Auxiliary Feedwater Pump Was Noted.Caused by MOV Being Left in Open Position.Closed Manual Isolation Valve to Secure Steam to Pump.With 990521 Ltr
ML17265A6591999-05-17017 May 1999
Part 21 Rept Re Relay Deficiency Detected During pre-installation Testing.Caused by Incorrectly Wired Relay Coil.Relays Were Returned to Eaton Corp for Investigation. Relays Were Repaired & Retested
ML17265A6441999-05-13013 May 1999
LER 99-005-00:on 990413,undervoltage Signal of Safeguards Bus During Testing Resulted in Automatic Start of B Edg. Caused by Personnel Error.Blown Fuse Was Replaced & Offsite Power Was Restored to Safeguards Bus 17.With 990513 Ltr
ML17265A6431999-05-12012 May 1999
LER 99-004-00:on 990412,discovered That Containment Recirculation Fan Moisture Separator Vanes Were Incorrectly Installed,Per 10CFR21.Caused by Improper Assembly by Mfg. Subject Vanes Were Dismantled & Correctly re-installed
ML17265A6381999-05-0707 May 1999
Part 21 Rept Re Replacement Turbocharger Exhaust Turbine Side Drain Port Not Functioning as Design Intended.Caused by Manufacturing Deficiency.Turbocharger Was Reaasembled & Reinstalled on B EDG
ML17265A6391999-04-30030 April 1999
Monthly Operating Rept for Apr 1999 for Re Ginna Nuclear Power Plant.With 990510 Ltr
ML17265A6361999-04-23023 April 1999
Part 21 Rept Re Power Supply That Did Not Work Properly When Drawn from Stock & Installed in -25 Vdc Slot.Power Supply Will Be Sent to Vendor to Perform Failure Mode Assessment.Evaluation Will Be Completed by 991001
ML17265A6301999-04-18018 April 1999
Rev 1 to Cycle 28 COLR for Re Ginna Npp.
ML17265A6251999-04-15015 April 1999
Special Rept:On 990309,halon Systems Were Removed from Svc & Fire Door F502 Was Blocked Open.Caused by Mods Being Made to CR Emergency Air Treatment Sys.Continuous Fire Watch Was Established with Backup Fire Suppression Equipment
ML17265A6551999-04-0909 April 1999
Initial Part 21 Rept Re Mfg Deficiency in Replacement Turbocharger for B EDG Supplied by Coltec Industries. Deficiency Consisted of Missing Drain Port in Intermediate Casing.Required Oil Drain Port Machined Open
ML17265A6291999-03-31031 March 1999
Rev 0 to Cycle 28 COLR for Re Ginna Npp.
ML17265A6241999-03-31031 March 1999
Monthly Operating Rept for Mar 1999 for Ginna Station.With 990409 Ltr
ML17265A6141999-03-31031 March 1999
LER 99-003-00:on 990301,two Main Steam non-return Check Valves Were Declared Inoperable Due to Exceedance of Acceptance Criteria.Caused by Changes in Methodology & Matls.Packing Gland Torque Will Be Adjusted.With 990331 Ltr
ML17265A6131999-03-29029 March 1999
LER 99-002-00:on 990227,discovered That Surveillance Had Not Been Performed at Frequency,Per Ts.Caused by Personnel Error.Procedure O-6.13 Will Be Evaluated for Enhancement Documentation of Completion of ITS Srs.With 990329 Ltr
ML17265A6061999-03-24024 March 1999
LER 99-001-00:on 990222,plant Was Noted Outside Design Basis.Caused by Deficiencies in NSSS Vendor Slb Mass & Energy Release.Placed Temporary Administrative Restriction 40 Degrees F Max on Screenhouse Bay Temp
ML17265A5661999-03-0101 March 1999
Rev 26 to QA Program for Station Operation.
ML17265A5961999-02-28028 February 1999
Monthly Operating Rept for Feb 1999 for Ginna Nuclear Power Plant.With 990310 Ltr
ML17265A5371999-01-31031 January 1999
Monthly Operating Rept for Jan 1999 for Re Ginna Nuclear Power Plant.With 990205 Ltr
ML17265A5951998-12-31031 December 1998
Rg&E 1998 Annual Rept.
ML17265A5001998-12-21021 December 1998
Rev 26 to QA Program for Station Operation.
ML17265A4951998-12-21021 December 1998
LER 98-005-00:on 981120,loss of 34.5 Kv Offsite Power Circuit 751,resulted in Automatic Start of B Edg.Caused by Faulted Cable Splice.Performed Appropriate Actions of Abnormal Procedure AP-ELEC.1.With 981221 Ltr
ML17265A4931998-12-17017 December 1998
LER 98-004-00:on 971030,determined That Improperly Performed Surveillance Resulted in Condition Prohibited by Ts.Caused by Procedure non-adherence.Appropriate Calibr Procedures Were Properly Performed with 24 H of Condition Discovery
ML17265A4761998-11-30030 November 1998
Monthly Operating Rept for Nov 1998 for Re Ginna Nuclear Power Plant.With 981210 Ltr
ML17265A4691998-11-25025 November 1998
LER 98-003-01:on 980904,actuations of CR Emergency Air Treatment Systems (Creats) Occurred.Caused by Radon build-up During Temp Inversion.Creats Actuation Signal Was Reset & Normal Ventilation Was Restored to CR
ML17265A4531998-10-31031 October 1998
Monthly Operating Rept for Oct 1998 for Re Ginna Nuclear Power Plant.With 981110 Ltr
ML17265A4271998-10-0505 October 1998
LER 98-003-00:on 980904,actuations of CR Emergency Air Treatment Sys Occurred.Caused by Radon build-up During Temp Inversion.Air Samples Were Taken & Determined That Source of Radiation Was Naturally Occurring Radon.With 981005 Ltr
ML17265A4291998-09-30030 September 1998
Monthly Operating Rept for Sept 1998 for Re Ginna Nuclear Power Plant.With 981009 Ltr
1999-09-30
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DEMONSTRATION OF THE CONFORMANCE OF EXXON NUCLEAR COMPANY FUEL TO THE WESTINGHOUSE K(Z)OPERATING ENVELOPE FOR THE ROBERT E.GINNA NUCLEAR POWER PLANT Westinghouse Electric Corporation Nuclear Technology Division Nuclear Safety Department Safeguards Engineering and Development September 1985 8512200249 851216 PDR ADOCK 05000244', P'DR I.ntroduction This document reports the results of a sensitivity study that was performed in order to demonstrate conformance of Exxon Nuclear Company nuclear fuel in the Robert E.Ginna nuclear power plant to the Westinghouse K(z)operating envelope.In particular, the results of.this analysis show that for skewed to the top power shapes, in addition to the power shape peaked at the mid-core elevation, that the worst peak cladding temperature (PCT)in the unlikely event of a Loss-Of-Coolant-Accident (LOCA)remains below the 2200 deg-F limit as specified by Appendix K of 10CFR50.46.
II.Method of Anal sis The sensitivity study was performed using the LOCTA computer code of the Westinghouse 1981 Large Break LOCA Evaluation Model (WEM)to calculate the PCT for Exxon fuel for three power shapes.The power.shapes investigated I were peaked at 6.0 ft., 8.0 ft., and at 10.5 ft.The power shapes used in the LOCA analyses are shown in Figures 1-3.The peak power of each power shape is limited by the current K(z)envelope for the Robert E.Ginna (RGE)power plant.The current K(z)envelope for RGE assumes a maximum total peaking factor of 2.32, and a hot channel enthalpy rise factor of 1.66.
The fuel design parameters for the Exxon fuel were obtained from the Exxon Nuclear Company through a three-party proprietary agreement betweenWestinghouse, Rochester Gas 6 Electric, an'd Exxon.The fuel parameters specific to each power shape were generated by Exxon and transmitted to Westinghouse.
The fuel parameters, which included fuel pellet temperatures and gap pressures, were then used as input in each of the LOCTA calculations.
The results of the LOCTA calculations are summarized in the following table: 'I Com arison of Exxon Fuel Peak Claddin Tem eratures Power Shape Peak PCT OF PCT Elevation PCT Time sec.6~0 8'10'1781 1598 1528 7.25 7'5 10.00 106 5..1 4'These results demonstrate that for the Robert E.Ginna Unit, that the chopped cosine power shape (i.e.6.0 ft.peaked shape)generates the most limiting peak clad temperature.
Figures 4-6 show the clad temperature response for the peak node for the 6.0, 8.0, and 10.5 ft.power shapes respectively.
An important observation of these results is that for the top-skewed shapes, the peak cladding temperature occurs during the blowdown phase.This is important because most of the Appendix K prescribed analytical models have their greatest influence during the ref lood phase.A peak
'~clad temperature which occurs during reflood is sensitive to core-wide and system-wide hydraulic phenomena, while a blowdown peak is a stronger function of initial fuel stored energy.A comparison of the peak clad temperatures during the blowdown and reflood phases for each of these power shapes provides a more conclusive demonstration that the chopped cosine power shape produces the most limiting LOCA results.Com arison of Peak Claddin Tem eratures Durin Blowdown Power Shape Peak PCT-Blowdown op PCT Elevation Time sec.6.0 8'10'1635 1598 1528 6~00 7'5 10.00 5'5'4'The comparison of peak clad temperatures during blowdown shows that the highest PCT occurs for the chopped cosine power shape.This is reasonable., because 6.0 ft.shape permits the highest total local peaking factor (2.32).The fact that the PCT for the top-skewed shapes occurs below the peak power location is due to the better heat transfer at higher elevations that occurs during the period of negative core flow.
Com arison of Peak Claddin Tem eratures Durin Reflood Power Shape Peak PCT-Reflood OF PCT Elevation Time sec.6~0 8~0 10'1781 1585 1458 7'5 F 00 10.00 106 74 68 The comparison of reflood peak clad temperatures shows an even wider margin between the chopped cosine shape and the top-skewed power shapes.Zn addition to showing that the chopped cosine power shape, is the"worst" power shape for a LOCA analysis of RGE with Exxon fuel, it also demonstrates a large margin to the 2200 deg-F limit for the top-skewed shapes for this plant.III.Use of Non-Exxon Fuel H draulics This sensitivity study was performed by re-calculating the clad V I temperature response for Exxon for the three power shapes using the LOCTA computer code.The hot assembly hydraulics was not re-calculated for the Exxon fuel.The blowdown and reflood hydraulic transients are generated using the SATAN, WREFLOOD and COCO computer codes.Existing blowdown and reflood hydraulics from a previous RGE plant specific analysis with W-OFA fuel were used as hot assembly boundary conditions for the LOCTA calculations.
Use of the OFA hydraulics are justifiable for this sensitivity study on the following basis:
(l)The W-OFA rod size is smaller than the Exxon rod size.This will result in a slower reflood of a full core of W-OFA fuel.Thus, for a given power shape, the use of the OFA core reflood rate provides a conservative'eflood rate for the Exxon fuel heat-up calculation.
(2)Previous sensitivities with top-skewed power shapes in SATAN have hot shown a large effect on the end-of-blowdown fuel temperatures.
Thus, the use of SATAN chopped cosine power shape results for top-skewed LOCTA calculations can be considered sufficiently accurate for a rough sensitivity study.Because of the wide margin between the cosine and the top-skewed shape PCTs in this analysis, re-calculation of the SATAN transient is not expected to change the conclusions of this analysis.IV.Conclusions The Westinghouse Large Break LOCA Evaluation Model clad heat-up computer code, LOCTA, was used to analyze Exxon fuel for three power shapes.The results confirmed that the power shape peaked..at the center of the core produces the highest peak cladding temperature.
This result for the Exxon fuel is consistent with power shape studies performed by Westinghouse with the same computer codes for Westinghouse fuel.The results of this study demonstrate that the Exxon fuel in the Robert E.Ginna nuclear power plant conforms to the current operating K(z)envelope for top-skewed power shapes.While the entire transient was not recalculated for this analysis, a complete re-analysis would not be expected to change the conclusions of this sensitivity study.\
0.0 3.0 4.25,.4.75 5.25 5.75-6.25 6.75 7.25 7.75 9.0 12.1.S 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 10.5 CORE HEIGHT (FEET)Figure 1.Axial Power Shape Peaked at 6.0 ft.(Chopped Cosine Power Shape) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.011.012.0
.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.511.5 CORE HEIGHT (FEET)Figure 2.Axial Power Shape Peaked at 8.0 ft; 2.S 2.0 M~1.S C5 1.0.5.0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.011.012.0
.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 1 1.5 CORE HEIGHT (FEET)Figure3.Axial Power Shape Peaked at 10.5 ft.
c~tlct l~clvbt tt~ov tv[5 tovlt 5vttl 51u0t O.~Cl (IC.C 0 tlte~Ovlt Svttl ll~0~vC 1[vt<<01~00 Iutlf i C 00 t'll I tl Jt~tot5 tll~I tW>.O C C 5'AO.O v o ltd.O 50vAO S<lvl~55C>Figure 4.Clad Temperature Response for PCT Location for the 6.0 ft.Power Shape.
~Oll~l C~Cllil Ct~00 lull tOOC~Swltl S'IUOt 0'OCClC O,O~Caa tOol~Ssstl CCAO Art.lllit.wOS 000~VOS'i~t CS lit l~City Sy$0 tll+l Vl C000.0 C\SSOO.O N X o l000.0 0.0 8 8 SINS ISCCI Figure 5.-Clad Temperature Response for PCT Location for 8.0 ft.Power Shape
~OltV<C, CIVVV t<<OV<Vt<VOVtV 5Vatt 5<VDV 0,~Ott<C 10.5 Vtvv VOvtV 5vVVt C<JD AVC.1t<<V,<<0<
VOD Ovv51~0.00<1<<Vtvv~O,DO A<~<W~0000.0 o 1500.0 X E<C o 1000.0 lr 0.0 CII<t<5CCI S g 8 Figure 6.Clad Temperature Response for PCT Location for the 10.5 ft.Power Shape-11
