Similar Documents at Cook |
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Category:REPORTS-TOPICAL (BY MANUFACTURERS-VENDORS ETC)
MONTHYEARML17335A5481999-09-30030 September 1999 Non-proprietary DC Cook Nuclear Plant Units 1 & 2 Mods to Containment Sys W SE (Secl 99-076,Rev 3). ML17333A4941996-05-31031 May 1996 Rev 1 to DCP Unit 2 3,600 Mwt Uprating Program Licensing Program Rept. ML17333A2071995-11-30030 November 1995 Nonproprietary Presentation Matls from 950810 Meeting W/ Aepsc,Nrc & Westinghouse Re Application of Revised Pressure Boundary Limits for Hej Sleeved Tubes. ML17333A2221995-11-29029 November 1995 Nonproprietary Response to NRC Questions on Backup Functions Environ Allowance Terms. ML17332A9921995-09-30030 September 1995 Repair Boundary for Parent Tube Indications within Upper Joint Zone of Hybrid Expansion Joint Sleeved Tubes. ML17332A9471995-09-30030 September 1995 Rev 1 to DC Cook Unit 1 Steam Generator Tube Plugging Criteria for Indications at Tube Support Plates. ML17331B2421994-02-28028 February 1994 Nonproprietary F* Tube Plugging Criterion for Tubes W/ Degradation in Tubesheet Roll Expansion Region of DC Cook Unit 1 Sgs. ML17334B4681993-02-28028 February 1993 Evaluation of PTS for DC Cook Unit 2. ML17329A4231992-03-31031 March 1992 Nonproprietary DC Cook Unit 1 Steam Generator Tube Plugging Criteria for Indications at Tube Support Plates. ML20029C1401991-01-31031 January 1991 Nonproprietary Structural Evaluation of DC Cook Nuclear Plant Units 1 & 2 Pressurizer Surge Line,Considering Effects of Thermal Stratification. ML20043C0711990-05-31031 May 1990 Westinghouse Revised Thermal Design Procedure Instrument Uncertainty Methodolgy for American Electric Power DC Cook Unit 2 Nuclear Power Station. ML17328A2941990-01-31031 January 1990 Analysis of Capsule U from American Electric Power Co DC Cook Unit 1 Reactor Vessel Radiation Surveillance Program. ML17328A7281989-09-30030 September 1989 Suppl 1 to, Rerated Power & Revised Temp & Pressure Operation for DC Cook Nuclear Plant,Units 1 & 2,Licensing Rept. ML17325B1371988-11-30030 November 1988 Aep Reactor Core Thermal-Hydraulic Analysis Using Cobra IIIC/MIT-2 Computer Code. ML17325A9671988-10-31031 October 1988 Reduced Temp & Pressure Operation for Donald C. Cook Nuclear Plant Unit 1 Licensing Rept, Including FSAR mark-ups ML20207G0071988-08-31031 August 1988 Rev 1 to Criticality Safety Analysis,Dc Cook Spent Fuel Storage Racks W/15 X 15 & 17 X 17 Fuel Enrichments Up to 5.0% ML20207G0221988-07-31031 July 1988 Thermal-Hydraulic Analysis of DC Cook Spent Fuel Pool ML17325A9081988-07-31031 July 1988 Containment Integrity Analysis for Donald C Cook Nuclear Plant Units 1 & 2. ML20207F9981988-07-31031 July 1988 Rev 0 to Final Rept Criticality Safety Analysis,Dc Cook New Fuel Storage Vault W/5.0% Enriched 17 X 17 Fuel ML20238A9621987-09-0202 September 1987 Investigation on Undervoltage Trip Attachments for Cause of Misoperation at DC Cook Unit 2 on 851029,EQ/P(86)-143 ML20207P8901987-01-15015 January 1987 Nonproprietary Rev 2 to DC Cook Unit 1 Limiting Break K(Z) Loca/Eccs Analysis ML20214J9241986-09-30030 September 1986 Nonproprietary NRC Presentation Rept on Steam Generator Tube Integrity for DC Cook Unit 2,Sept 1986 ML17324A7541986-02-28028 February 1986 Nonproprietary American Electric Power DC Cook Unit 2 Rdf RTD Installation Safety Evaluation. ML20151Z0461986-01-31031 January 1986 NRC Presentation Rept on Steam Generator Tube Integrity for DC Cook Unit 2 ML20154H9841985-12-31031 December 1985 Nonproprietary, Spray Additive Tank Deletion Analysis ML20151U8871985-11-30030 November 1985 Limiting Break K(Z) Loca/Eccs Analysis ML17326B0101985-07-31031 July 1985 Nonproprietary XN-NF-85-28, DC Cook Unit 2,Cycle 6 Sar. ML20116K2131985-04-30030 April 1985 Suppl 2 to Rev 2 to DC Cook,Unit 2 Cycle 5 5% Steam Generator Tube Plugging Limiting Break LOCA-ECCS Analysis: K(Z) Curve ML20100G5111985-04-0404 April 1985 Suppl 1 to Rev 2 to DC Cook Unit 2 Cycle 5 5% Steam Generator Tube Plugging Limiting Break Loca/Eccs Analysis: K(Z) Curve ML20151R7131985-03-31031 March 1985 Rev 1 to Evaluation of Acceptability of Reactor Vessel Head Lift Rig,Reactor Vessel Internals Lift Rig,Load Cell & Load Cell Linkage to Requirements of NUREG-0612 for Indiana & Michigan Electric Co,Dc Cook 1 & 2 ML20113A4261985-02-28028 February 1985 Rev 0 to Suppl 4-NP to Westinghouse Technical Support Complex Design & Verification & Validation Process for DC Cook Nuclear Plant ML20096C9241984-08-21021 August 1984 Mechanical Design Rept Suppl for DC Cook Unit 1 Extended Burnup Fuel Assemblies ML17326B1341984-08-0707 August 1984 Nonproprietary Version of Rev 2 to DC Cook,Unit 2 Cycle 5,5%.Steam Generator Tube Plugging Limiting Break Loca/Eccs Analysis. ML20090J2371984-07-17017 July 1984 Generic Mechanical Design Rept,Exxon 17x17 Fuel Assembly ML20090K4811984-05-22022 May 1984 Nonproprietary Rev 1 to DC Cook Unit 2 Cycle 5 5% Steam Generator Tube Plugging Limiting Break Loca/Eccs Analysis ML20081D0021984-03-31031 March 1984 Potential Radiological Consequences of Incidents Involving High Exposure Fuel,Dc Cook,Unit 2 ML17320A9461984-03-0303 March 1984 Nonproprietary Rev 2 to Plant Transient Analysis for DC Cook Unit 2 Reactor at 3,425 Mwt Operation W/5% Steam Generator Tube Plugging. ML17320A9441984-03-0101 March 1984 Nonproprietary DC Cook Unit 2 Cycle 5 - 5% Steam Generator Tube Plugging Limiting Break Loca/Eccs Analysis. ML17320A9411984-02-23023 February 1984 Suppl 1 to DC Cook Unit 2,Cycle 5 Sar. ML17320A9451983-10-24024 October 1983 DC Cook Unit 2,Cycle 5 Sar. ML20081M2851983-10-21021 October 1983 Exxon Nuclear DNB Correlation for PWR Fuel Designs ML20095D2311983-08-0303 August 1983 DC Cook Unit 1 LOCA-ECCS Analysis for Extended Exposure ML17320A5561983-04-30030 April 1983 Evaluation of Acceptability of Reactor Vessel Head Lift Rig,Reactor Vessel Internals Lift Rig,Load Cell & Load Cell Linkage to Requirements of NUREG-0612. ML17319B6661982-11-18018 November 1982 Suppl 1 to DC Cook Unit 2 Cycle 4 Limiting Break LOCA-ECCS Analysis Using Exem/Pwr. ML17319B6701982-11-17017 November 1982 DC Cook Unit 2 Potential Radiological Consequences of Incidents Involving High Exposure Fuel. ML17319B4111982-04-30030 April 1982 DC Cook Unit 2,Cycle 4 Sar. ML17319B4121982-04-30030 April 1982 DC Cook Unit 2 LOCA ECCS Analysis Using Exem/Pwr Large Break Results. ML19350C3911981-02-12012 February 1981 LOCA ECCS Reanalysis for DC Cook Unit 1 Using ENC Wrem 11A PWR ECCS Evaluation Model. ML17321A6611980-10-31031 October 1980 Rev 0 to Man-Machine Interface Design Basis Document:Info Coding for Computer Display Sys. ML17329A5671975-11-30030 November 1975 American Electric Power Co DC Cook Unit 2 Reactor Vessel Radiation Surveillance Program. 1999-09-30
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML17335A5641999-10-18018 October 1999 LER 99-024-00:on 990708,literal TS Requirements Were Not Met by Accumlator Valve Surveillance.Caused by Misjudgement Made in Conversion from Initial DC Cook TS to W Std Ts.Submitted License Amend Request.With 991018 Ltr ML17335A5531999-10-0707 October 1999 LER 99-023-00:on 990907,inadequate TS Surveillance Testing of ESW Pump ESF Response Time Noted.Caused by Inadequate Understanding of Plant Design Basis.Surveillance Tests Will Be Revised & Implemented ML17335A5631999-09-30030 September 1999 Monthly Operating Rept for Sept 1999 for DC Cook Nuclear Plant,Unit 1.With 991012 Ltr ML17335A5621999-09-30030 September 1999 Monthly Operating Rept for Sept 1999 for DC Cook Nuclear Plant,Unit 2.With 991012 Ltr ML17335A5481999-09-30030 September 1999 Non-proprietary DC Cook Nuclear Plant Units 1 & 2 Mods to Containment Sys W SE (Secl 99-076,Rev 3). ML17335A5451999-09-28028 September 1999 Rev 1 to Containment Sump Level Design Condition & Failure Effects Analysis for Potential Draindown Scenarios. ML17326A1291999-09-17017 September 1999 LER 99-022-00:on 990609,electrical Bus Degraded Voltage Setpoints Too Low for Safety Related Loads,Was Discovered. Caused by Lack of Understanding of Design of Plant.No Immediate Corrective Actions Necessary ML17326A1481999-09-17017 September 1999 Independent Review of Control Rod Insertion Following Cold Leg Lbloca,Dc Cook,Units 1 & 2. ML17326A1211999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Cook Nuclear Plant, Unit 2.With 990915 Ltr ML17326A1201999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Cook Nuclear Plant, Unit 1.With 990915 Ltr ML17326A1121999-08-27027 August 1999 LER 99-021-00:on 990728,determined That GL 96-01 Test Requirements Were Not Met in Surveillance Tests.Caused by Failure to Understand Full Extent of GL Requirements. Surveillance Procedures Will Be Revised or Developed ML17326A1011999-08-26026 August 1999 LER 99-020-00:on 990727,EDGs Were Declared Inoperable.Caused by Inadequate Protection of Air Intake,Exhaust & Room Ventilation Structures from Tornado Missile Hazards. Implemented Compensatory Measures in Form of ACs ML17326A0911999-08-16016 August 1999 LER 99-019-00:on 990716,noted Victoreen Containment Hrrms Not Environmentally Qualified to Withstand post-LOCA Conditions.Caused by Inadequate Design Control.Reviewing Options to Support Hrrms Operability in Modes 1-4 ML17326A0771999-08-0404 August 1999 LER 98-029-01:on 980422,noted That Fuel Handling Area Ventilation Sys Was Inoperable.Caused by Original Design Deficiency.Radiological Analysis for Spent Fuel Handling Accidents in Auxiliary Bldg Will Be Redone by 990830 ML17335A5461999-08-0202 August 1999 Rev 0 to Evaluation of Cook Recirculation Sump Level for Reduced Pump Flow Rates. ML17326A0871999-07-31031 July 1999 Monthly Operating Rept for July 1999 for DC Cook Nuclear Plant,Unit 1.With 990812 Ltr ML17326A0861999-07-31031 July 1999 Monthly Operating Rept for July 1999 for DC Cook Nuclear Plant,Units 2.With 990812 Ltr ML17326A0741999-07-29029 July 1999 LER 99-018-00:on 990629,determined That Valve Yokes May Yield Under Combined Stress of Seismic Event & Static,Valve Closed,Stem Thrust.Caused by Inadequate Design of Associated Movs.Operability Determinations Were Performed for Valves ML17326A0661999-07-26026 July 1999 LER 99-017-00:on 990625,noted That Improperly Installed Fuel Oil Return Relief Valve Rendered EDG Inoperable.Caused by Personnel Error.Fuel Oil Return Valve Was Replaced with Valve in Correct Orientation.With 990722 Ltr ML17326A0651999-07-22022 July 1999 LER 98-014-03:on 980310,noted That Response to high-high Containment Pressure Procedure Was Not Consistent with Analysis of Record.Caused by Inadequate Interface with W. FRZ-1 Will Be Revised to Be Consistent with New Analysis ML17326A0491999-07-13013 July 1999 LER 99-016-00:on 990615,TS Requirements for Source Range Neutron Flux Monitors Not Met.Caused by Failure to Understand Design Basis of Plant.Procedures Revised.With 990713 Ltr ML17326A0331999-07-0101 July 1999 LER 99-004-01:on 971030,failure to Perform TS Surveillance Analyses of Reactor Coolant Chemistry with Fuel Removed Was Noted.Caused by Ineffective Mgt of Tss.Chemistry Personnel Have Been Instructed on Requirement to Follow TS as Written ML17326A0511999-06-30030 June 1999 Monthly Operating Rept for June 1999 for DC Cook Nuclear Plant,Unit 2.With 990709 Ltr ML17326A0501999-06-30030 June 1999 Monthly Operating Rept for June 1999 for DC Cook Nuclear Plant,Unit 1.With 990709 Ltr ML17326A0151999-06-18018 June 1999 LER 99-014-00:on 990521,determined That Boron Injection Tank Manway Bolts Were Not Included in ISI Program,Creating Missed Exam for Previous ISI Interval.Caused by Programmatic Weakness.Isi Program & Associated ISI Database Modified ML17325B6421999-06-0101 June 1999 LER 99-013-00:on 990327,safety Injection & Centrifugal Charging Throttle Valve Cavitation During LOCA Could Have Led to ECCS Pump Failure.Caused by Inadequate Original Design Application of Si.Throttle Valves Will Be Developed ML17325B6311999-06-0101 June 1999 LER 99-S03-00:on 990430,vital Area Barrier Degradation Was Noted.Caused by Inadequate Insp & Maint of Vital Area Barrier.Repairs & Mods Were Made to Barriers to Eliminate Degraded & Nonconforming Conditions ML17326A0061999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Dcp.With 990609 Ltr ML17326A0071999-05-31031 May 1999 Monthly Operating Rept for May 1999 for DC Cook Nuclear Plant,Unit 2.With 990609 Ltr ML17325B6351999-05-28028 May 1999 LER 99-S02-00:on 990428,vulnerability in Safeguard Sys That Could Allow Unauthorized Access to Protected Area Was Noted. Caused by Inadequate Original Plant Design.Mods Were Made to Wall Opening to Eliminate Nonconforming Conditions ML17265A8231999-05-24024 May 1999 LER 98-037-01:on 990422,determined That Ice Condenser Bypass Leakage Exceeds Design Basis Limit.Caused by Pressure Seal Required by Revised W Design Not Incorporated Into Aep Design.Numerous Matl Condition Walkdowns & Assessments Made ML17325B6001999-05-20020 May 1999 LER 99-012-00:on 990420,concluded That Auxiliary Bldg ESF Ventilation Sys Not Capable of Maintaining ESF Room Temps post-accident.Caused by Inadequate Control of Sys Design Inputs.Comprehensive Action Plan Being Developed ML17325B5861999-05-10010 May 1999 LER 99-002-00:on 990415,discovered That TS 4.0.5 Requirements Were Not Met Due to Improperly Performed Test. Caused by Incorrect Interpretation of ASME Code.App J Testing Will Be Completed & Procedures Will Be Revised ML17325B5811999-05-0404 May 1999 LER 99-011-00:on 990407,air Sys for EDG Will Not Support Long Operability.Caused by Original Design Error.Temporary Mod to Supply Makeup Air Capability in Modes 5 & 6 Was Prepared ML17325B5771999-05-0303 May 1999 LER 99-010-00:on 990401,RCS Leak Detection Sys Sensitivity Not in Accordance with Design Requirements Occurred.Caused by Inadequate Original Design of Containment Sump Level. Evaluation Will Be Performed to Clearly Define Design ML17335A5301999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for DC Cook Nuclear Plant,Unit 1.With 990508 Ltr ML17335A5291999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for DC Cook Nuclear Plant,Unit 2.With 990508 Ltr ML17325B5581999-04-16016 April 1999 LER 99-006-00:on 990115,personnel Identified Discrepancy Between TS 3.9.7 Impact Energy Limit & Procedure 12 Ohp 4030.STP.046.Caused by Lack of Design Basis Control.Placed Procedure 12 Ohp 4030.STP.046 on Administrative Hold ML17325B5471999-04-12012 April 1999 LER 99-009-00:on 990304,as-found RHR Safety Relief Valve Lift Setpoint Greater than TS Limit Occurred.Cause Investigation for Condition Has Not Been Completed.Update to LER Will Be Submitted,Upon Completion of Investigation ML17325B5321999-04-0707 April 1999 LER 99-S01-00:on 990308,discovered That Lock for Vital Gate Leading to Plant 4KV Switchgear Area Was Nonconforming & Vulnerable to Unauthorized Access.Caused by Inadequate Gate Design & Inadequate Procedures.Mods Are Being Made to Gate ML17325B5161999-04-0101 April 1999 LER 99-007-00:on 981020,calculations Showed That Divider Barrier Between Upper & Lower Containment Vols Were Overstressed.Engineers Are Currently Working on Analyses of Loads & Stress on Enclosures ML17325B5491999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for DC Cook Nuclear Plant Unit 2.With 990408 Ltr ML17325B5441999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for DC Cook Nuclear Plant,Unit 1.With 990408 Ltr ML17325B5221999-03-29029 March 1999 LER 99-001-00:on 960610,degraded Component Cooling Water Flow to Containment Main Steam Line Penetrations,Identified on 990226.Caused by Inadequate Understanding of Design Basis.Additional Investigations Ongoing ML17325B4801999-03-18018 March 1999 LER 99-004-00:on 971030,failure to Perform TS Surveillance Analyses of Rc Chemistry with Fuel Removed Was Noted.Cause of Event Is Under Investigation.Corrected Written Job Order Activities Used to Control SD Chemistry Sampling ML17325B4741999-03-18018 March 1999 LER 99-005-00:on 940512,determined That Rt Breaker Manual Actuations During Rod Drop Testing Were Not Previously Reported.Caused by Lack of Training.Addl Corrective Actions,Including Preventative Actions May Be Developed ML17325B5671999-03-0202 March 1999 Summary of Unit 1 Steam Generator Layup Chemistry from 980101 to 990218. ML17325B4631999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for DC Cook Nuclear Power Station,Unit 2.With 990308 Ltr ML17325B4621999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for DC Cook Nuclear Plant,Unit 1.With 990308 Ltr ML17325B4571999-02-24024 February 1999 LER 99-003-00:on 990107,CR Pressurization Sys Surveillance Test Did Not Test Sys in Normal Operating Condition.Caused by Failure to Recognize Door 12DR-AUX415 as Part of CR Pressure Boundary.Performed Walkdown of Other Doors 1999-09-30
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XN-NF-83-85 Supplement I Issue Date: 2/23/84 D.C.COOK UNIT 2, CYCLE 5 SAFETY ANALYSIS REPORT By: R..Copeland Prepared by: Approved by: Prepared by: R.B.Stout, Manager Licensing 5 Sa ety gineering Ci';~i r.'-'~/~:~.E.Will samson, Manager Neutroni s 8 uel Mana ement Approved by: Concurred by:.F.Busselman, Manager'uel Design Pp/j~: Ji t.A.Sofer, Manager/Fuel Engineering 8 Technical Services M Kivu~ivy i+.N.1organ, Manager Proposals 5 Customer Service Engineering 8403080220 840302 PDR ADOCK 05000326 naa PDR ON NUCLEAR COMPANY, Inc.
NUCLEAR REGULATORY COMMISSION DISCLAIMER IMPORTANT NOTICE REGARDING CONTENTS AND USE OF THIS DOCUMENT PLEASE READ CAREFUL!.Y This technical report was rlerived through research and development programs sponsored by Exxon Nuclear Company, Inc.It is being sub-mitted by Exxon Nuclear to the USNRC as part of a technical contri-bution to facilitate safety analyses by licensees of the USNRC which utilize Exxon Nuclear-fabricated reload'uel or other technical sewices provided by Exxon Nuclear.for liaht water power reactors and it is true and correct to the best of Exxon Nuclear's knowledge, information, and belief.The information contained herein may be used by the USNRC in its review of this report, and by licensees or applicants before the-USNRC which are customers of Exxon Nuclear in their demonstration of compliance with the USNRC's regulations..
Without derogating from the foregoing, neither Exxon Nuclear nor any person acting nn its behalf: A.Makes any warranty, express or implied, with respect to the accuracy, completeness, or usefulness of the infor-mation contained in this document, or that the use of any Information, apparatus, method, or process disclosed in this document will not infringe privately owned rights;or B.Assumes any liabilities with respect to the use of, or for dan'ages resulting from the use of, any information, ap.paratus, method, or process disclosed in this document.XN-NF-FOO, 766 XN-NF-83-85 Supplement 1 TABLE OF CONTENTS Section~Pa e
1.0 INTRODUCTION
...............................................
2~0
SUMMARY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~2 3.0 CYCLE DESIGN..........................-............-..-;....
4 4.0 FUEL DESIGN...........-....................................
5 5.0 THERMAL HYDRAULIC DESIGN ANALYSIS..........................
6 6.0 ACCIDENT AND TRANSIENT ANALYSIS............................
7 6.1 LOCA ECCS ANALYSIS..............-......-..............
7 6.2 PLANT TRANSIENT ANALYSES......
K 6.3 ROD BOW ANALYSIS..............
~~~~~~~~~~~~~~~~~~~~~~~~7 P~~~~~~~~~~~~~~~~~~~~~~~~7 7.0 ASSESSMENT OF RADIOLOGICAL CONSEQUE ACCIDENTSo
~~~~~~~~~~~~~~~~~~~~~~~~~NCES OF 8.0 REfERENCES.................................................
10
XN-NF-83-85 Supplement 1
1.0 INTRODUCTION
This report is a supplement to the cycle 5 Safety Analysis Report for D.C.Cook Unit 2.The main report addressed the operating history of the reference cycle, power distribution considerations, control rod reactivity requirements, temperature coefficient considerations, and the control rod ejection accident analysis.This report presents results of ECCS LOCA, thermal margin, rod bow, and radiological assessment analyses.The ECCS LOCAand plant transient analyses were performed to support operation of the D.C.Cook Unit 2 reactor with 5X of the steam generator tubes plugged.The rod bow analysis was performed because rod bow results are dependent on the plant transient predictions for 5I tube plugging.The radiological assessment was redone using ENC's current radiological assessment methodology, which now in-cludes the generically approved version of RODEX2.
2.XN-NF-83-85
, Supplement 1 2.0
SUMMARY
The D.C.Cook Unit 2 nuclear'plant is scheduled to begin cycle 5 operation in the spring of 1984.The reload (reload batch XN-2)will consist of ninety-two fresh 17x17 fuel assemblies designed by Exxon Nuclear Company.A description of the cycle characteristics as well as the reference cycle are provided in the main cycle 5 Safety Analysis Report(>)along with the fuel description.
In anticipation of steam generator tube degradation, American Elec-tric Power requested Exxon Nuclear to provide the analyses needed to support operation of D.C.'ook Unit 2 with up to 5X of the tubes plugged.The ECCS LOCA and plant transient analyses required to support operation with" up to 5X tube plugging, are provided in References 2 and 3, respectively.
For the cycle 4 design, the fuel burnup and plant power were increased.
Therefore an assessment was made of the potential radiological consequences of the postulated accidents(4).
The NRC had not completed the generic review of RODEX2 which is the Exxon Nuclear fuel performance code, which was used as part of the radiological assessment.
The review has now been completed, and the analysis redone usi'ng the approved version.The results of reanalyses(5) show that the previous assessment provides bounding predictions.
A rod bow evaluation, required for assembly burnups greater than 28,000 MWD/MTU, was done using the generically approved Exxon Nuclear methodology.
The results indicated that there was margin between the DNBR limit and the minimum DNBR even with the calculated penalty for rod bow.Also, the calculations showed that the total peaking uncertainty was XN-NF-83-85 Supplement 1 within design tolerances.
Therefore, there is no impact on the design from rod bow.
XN-NF-83-85 Supplement 1 3.0 CYCLE DESIGN The cycle design, reference cycle comparisons, and neutronic charac-teristics of cycle 5 of D.C.Cook Unit 2 are presented in Reference 1.This report also addresses the control rod reactivity requirements, moderator temperature coefficient considerations, and power distribution.
The results of all of these analyses confirm that the cycle 5 design will operate within the technical specification limits for a projected cycle length of 17,900 MWD/MT at a core power of 3411 MWt with 10 ppm soluble boron remaining.
XN-NF-83-85 Supplement 1 4.0 FUEL OESIGN A description of the Exxon Nuclear supplied fuel design and design methods is contained in Reference 6.This fuel has been designed to be compatible with the resident fuel and to maintain its mechanical integrity while satisfying the neutronic and thermal hydraulic design requirements.
The creep collapse evaluation in reference 6 was performed using the criterion proposed in the Exxon Nuclear high burnup report (>0).This proposed criterion precludes the formation of gaps in the pellet stack, thus precluding creep collapse of the cladding.The prior creep collapse criterion, that the cladding had to be free-standing throughout its design life, is satisfied up to a peak rod exposure of 40,000 MWO/NTU.
XN-NF-83-85 Supplement I 5.0 THERMAL HYDRAUL'IC DESIGN ANALYSIS The Exxon Nuclear supplied fuel has been designed to be thermal-hydraulically compatible with the co-resident fuel in the D.C.Cook Unit 2 core.This analysis is reported in Reference 7 and is unchanged with the 5X steam generator tube plugging.
7 XN-NF-83-85'upplement I 6.0 ACCIDENT AND TRANSIENT ANALYSES 6.1 LOCA ECCS ANALYSIS The loss of coolant ECCS analysis was redone for D.C.Cook Unit 2 assuming a 5X steam generator tube plugging level.A detai led description of the analyses and the results are presented in Reference 2.The report documents operating limits which assure operation of the D.C.Cook Unit 2 reactor is within cr iteria specified by 10 CFR 50.46 and Appendix K.6.2 PLANT TRANSIENT ANALYSES The plant transient analyses for D.C.Cook Unit 2 were redone assuming a 5X steam generator tube plugging level.The primary coolant flow was reduced to reflect increased flow resistance in the steam generators.
The steam generator heat transfer area was reduced and the effects of the plugging on the limiting transients were analyzed.A f detailed description of the analyses and the results are presented in Reference 3.These results showed that SAFDL's are not violated for the anticipated operational occurrences and that 10 CFR Part 100 radiological limits are satisfied for postulated accidents.
6.3 ROD BOW ANALYSIS The Exxon Nuclear methodology for computing a rod bow penalty(8) to the departure from nucleate boi ling ratio (DNBR)and for computing the effects of rod bow on the total peaking (Fq)uncertainty was being reviewed U by the NRC at the time the cycle 4 analysis was presented.
Therefore the cycle 4 Safety Evaluation Report (SER)required that the effects of rod bow be assessed f or Exxon Nuc 1 ear desi gned f ue1 wi th assembly exposures XN-NF-83-85 Supplement 1 greater than 28,000 MWO/MTU.Since that SER, the Exxon Nuclear methodology was generically approved by the Staff.Using this methodology, the effect of rod bow on the MDNBR for the limiting transient has been reevaluated.
The rod bow penalty for the limiting anticipated operational occurrence (AOO)requires the MONBR to be reduced 13.2X at a peak O.C.Cook Unit 2 assembly exposure of 43,000 MWO/MTU;The approved XNB(g)limit for ONBR is 1.17.Above this limit fuel failures are not predicted and acceptance criteria are satisfied.
To satisfy this limit at a peak O.C.Cook Unit 2'assembly exposure of 43,000 MWO/MTU, the MDNBR from the limiting AOO must be greater than 1.35.The plant transient analyses for the D.C.Cook Unit 2 with 5X of the steam generator tubes plugged showed that the limiting transient (slow control rod withdrawal) had an MONBR above 1.35.There-fore, no operational penalty is required to account for rod bow.U Similarly, the changes in the total peaking uncertainty (Fq)and the total peaking (Fq)are within the design tolerances.
Therefore, no penalty is required.
XN-NF-83-85 Supplement 1 7.0 ASSESSMENT OF RADIOLOGICAL CONSE UENCES OF ACCIDENTS An analysis of the biological doses received from radiological release during accidents involving high exposure fuel was documented in Reference 4 and submitted for cycle 4 operation of D.C.Cook Unit 2.That report demonstrated that the Exxon Nuclear fuel would not violate the 10 4 CFR 100 off-site radiation dose limits after operating the reactor with increased core power and irradiating the fuel to a batch average exposure of 40,000 MWD/MTU.The isotopic release fractions from the fuel were calculated with the then-current version of the RODEX2 fuel performance code.Subsequent to that analysis, a revised version of RODEX2 received final generic approval from the NRC.Therefore, the potential doses were reanalyzed using the approved RODEX2 to calculate the release frac-tions(5).The results of that reanalysis showed the previous assessment to be bounding,i.e., the previous assessment predicted larger potential doses.
10 XN-NF-83-85.
Supplement l
8.0 REFERENCES
1.XN-NF-83-85,"D.C.Cook Unit 2, Cycle 5 Safety Analysis Report", Exxon Nuclear Company, October 1983.2.XN-NF-84-21(P),"Donald C.Cook Unit 2 5g Steam Generator Tube Plugging Limiting Break LOCA ECCS Analysis", Exxon Nuclear Company, February 1984.3.XN-NF-82-32(P), Revision 2,"Plant Transient Analysis for the Donald C.Cook Unit 2 Reactor at 3425 MWt, Operation with 5X Steam Generator Tube Plugging", Exxon Nuclear Company, February 1984.4.XN-NF-82-90,"D.C.Cook Unit 2, Potential Radiological Consequences of Incidents Involving High Exposure Fuel".Exxon Nuclear Company, November 1982.6.XN-NF-82-90, Supplement 1,"D.C.Cook Unit 2, Potential Radiological Consequences of Incidents Involving high Exposure Fuel", Exxon NuclearCompany, January 1984.XN-NF-82-25(P)(A),"Generic Mechanical Design Report, Exxon 17x17 Fuel Assembly", Exxon Nuclear Company, September 1983.7.XN-NF-82-37(P), Supplement 1,"D.C.Cook Unit 2, Cycle 4 Safety Analysis Report", Exxon Nuclear Company, September 1982..8.9.XN-75-32(P)(A), Supplements 1, 2, 3, 4,"Computational Procedure for Evaluating Fuel Rod Bowing", Exxon Nuclear Company, October 1983.XN-NF-621(P)(A), Revision 1,"Exxon Nuclear DNB Correlation for PWR Fuel Designs", Exxon Nuclear Company, September 1983.10.XN-NF-82-06(P)
Revision 1,"qualification of Exxon Nuclear Fuel for Extended Burnup", Exxon Nuclear Company, June 1982.
XN-NF-83-85 Supplement 1 Issue Date: 2/23/84 DC COOK UNIT 2, CYCLE 5 SAFETY ANALYSIS REPORT Distribution C.A.Brown J.C.Chandler R.A.Copeland W.V.Kayser M.R.Killgore G.F.Owsley R.A.Pugh R.B.Stout T.Tahvili P.M.Wimpy H.G.Shaw/AEP (5)Document Control (5)