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Category:Annual Operating Report
MONTHYEARML23117A2942023-04-27027 April 2023 Annual Radiological Environmental Operating Report ULNRC-06801, CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions2023-03-30030 March 2023 CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions ULNRC-06732, Annual Radiological Environmental Operating Report, January 1 to December 31, 20212022-04-22022 April 2022 Annual Radiological Environmental Operating Report, January 1 to December 31, 2021 ML22081A3202022-03-22022 March 2022 Changes to the Westinghouse ECCS Evaluation Model and PCT Penalty Assessments ULNRC-06653, Annual Radiological Environmental Operating Report2021-04-28028 April 2021 Annual Radiological Environmental Operating Report ULNRC-06652, Annual Radioactive Effluent Release Report2021-04-28028 April 2021 Annual Radioactive Effluent Release Report ULNRC-06497, 10 CFR 50.46 Annual Report ECCS Evaluation Model Revisions2019-03-28028 March 2019 10 CFR 50.46 Annual Report ECCS Evaluation Model Revisions ULNRC-04631, Annual Radiological Environmental Operating Report2018-05-0101 May 2018 Annual Radiological Environmental Operating Report ML18121A1672018-05-0101 May 2018 Annual Radioactive Effluent Release Report ULNRC-06428, 10 CFR 50.46 Annual Report ECCS Evaluation Model Revisions2018-03-29029 March 2018 10 CFR 50.46 Annual Report ECCS Evaluation Model Revisions ULNRC-06361, Submittal of 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions2017-03-30030 March 2017 Submittal of 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions ULNRC-06202, Transmittal of 10 CFR 50.59 and 10 CFR 72.48 Summary Report2015-05-22022 May 2015 Transmittal of 10 CFR 50.59 and 10 CFR 72.48 Summary Report ULNRC-06196, Cycle 20 Commitment Change Summary Report, Guideline for Managing NRC Commitment Changes, for Changes Requiring NRC Notification Annually or at a Frequency Consistent with That Required for FSAR Updates Per 10CFR 50.71.2015-03-18018 March 2015 Cycle 20 Commitment Change Summary Report, Guideline for Managing NRC Commitment Changes, for Changes Requiring NRC Notification Annually or at a Frequency Consistent with That Required for FSAR Updates Per 10CFR 50.71. ML13119A1422013-04-27027 April 2013 Annual Radiological Environmental Operating Report, January 1 to December 31, 2012. Enclosure to ULNRC-05987 ULNRC-05875, 2010 Annual Radiological Environmental Operating Report2012-06-20020 June 2012 2010 Annual Radiological Environmental Operating Report ULNRC-05865, CFR 50.59 Summary Report for June 30, 2010 to November 25, 20112012-05-24024 May 2012 CFR 50.59 Summary Report for June 30, 2010 to November 25, 2011 ULNRC-05853, 2011 Annual Radiological Environmental Operating Report2012-04-27027 April 2012 2011 Annual Radiological Environmental Operating Report ULNRC-05840, CFR 50.46 Annual Report ECCS Evaluation Model Revisions2012-03-0101 March 2012 CFR 50.46 Annual Report ECCS Evaluation Model Revisions ULNRC-05784, Submittal of 2010 Radiological Effluent Release Report2011-04-29029 April 2011 Submittal of 2010 Radiological Effluent Release Report ULNRC-05785, Enclosure 44 to ULNRC-05893 - Ameren Missouri. 2011. 2010 Annual Radiological Environmental Operating Report for the Callaway Plant. USNRC-05785. April 29, 20112011-04-29029 April 2011 Enclosure 44 to ULNRC-05893 - Ameren Missouri. 2011. 2010 Annual Radiological Environmental Operating Report for the Callaway Plant. USNRC-05785. April 29, 2011 ULNRC-05769, 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions2011-03-0101 March 2011 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions ULNRC-05769, Callaway Plant - 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions2011-03-0101 March 2011 Callaway Plant - 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions ML1106012712011-03-0101 March 2011 Callaway Plant - 10 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions ULNRC-05702, Annual Radiological Environmental Operating Report2010-04-30030 April 2010 Annual Radiological Environmental Operating Report ULNRC-05699, Annual Radioactive Effluent Release Report2010-04-27027 April 2010 Annual Radioactive Effluent Release Report ULNRC-05640, Annual Radiological Environmental Operating Report2009-07-22022 July 2009 Annual Radiological Environmental Operating Report ULNRC-05622, 2008 Annual Radiological Environmental Operating Report2009-04-30030 April 2009 2008 Annual Radiological Environmental Operating Report ULNRC-05475, CFR 50.46 Annual Report, ECCS Evaluation Model Revisions2008-03-0404 March 2008 CFR 50.46 Annual Report, ECCS Evaluation Model Revisions ULNRC-05400, 2006 Annual Radiological Environmental Operating Report2007-04-23023 April 2007 2006 Annual Radiological Environmental Operating Report ULNRC-05316, Annual Radiological Environmental Operating Report2006-07-25025 July 2006 Annual Radiological Environmental Operating Report 2023-04-27
[Table view] Category:Letter type:ULNRC
MONTHYEARULNRC-06853, Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.7172024-01-29029 January 2024 Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.717 ULNRC-06847, Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01)2023-12-21021 December 2023 Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01) ULNRC-06849, License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds2023-12-20020 December 2023 License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds ULNRC-06844, Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification2023-12-0707 December 2023 Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification ULNRC-06827, Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2023-11-20020 November 2023 Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) ULNRC-06824, Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A2023-08-17017 August 2023 Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A ULNRC-06830, Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak2023-08-15015 August 2023 Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak ULNRC-06223, Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004)2023-07-25025 July 2023 Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004) ULNRC-06799, Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications2023-07-13013 July 2023 Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications ULNRC-06821, Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301)2023-06-21021 June 2023 Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301) ULNRC-06822, Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a2023-06-14014 June 2023 Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a ULNRC-06815, Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a2023-06-0505 June 2023 Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a ULNRC-06818, Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate .2023-06-0505 June 2023 Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate . ULNRC-06816, Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015)2023-05-0909 May 2023 Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015) ULNRC-06812, Submittal of 2022 Annual Radiological Environmental Operating Report2023-04-27027 April 2023 Submittal of 2022 Annual Radiological Environmental Operating Report ULNRC-06806, Submittal of Radiological Emergency Response Plan, Revision 552023-04-12012 April 2023 Submittal of Radiological Emergency Response Plan, Revision 55 ULNRC-06807, Submittal of Single Positive Test Forms2023-04-0303 April 2023 Submittal of Single Positive Test Forms ULNRC-06798, Submittal of Status of Plant Decommissioning Funding and ISFSI Decommissioning Funding Plan2023-03-30030 March 2023 Submittal of Status of Plant Decommissioning Funding and ISFSI Decommissioning Funding Plan ULNRC-06801, CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions2023-03-30030 March 2023 CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions ULNRC-06804, Submittal of Nuclear Property Insurance Reporting2023-03-29029 March 2023 Submittal of Nuclear Property Insurance Reporting ULNRC-06751, Application to Revise Technical Specifications to Adopt TSTF-501-A, Rev. 1, Relocate Stored Oil & Lube Oil Volume Values to Licensee Control2023-03-29029 March 2023 Application to Revise Technical Specifications to Adopt TSTF-501-A, Rev. 1, Relocate Stored Oil & Lube Oil Volume Values to Licensee Control ULNRC-06803, Submittal of Response to Request for Additional Information Regarding Results of Steam Generator Tube In-Service Inspection2023-03-29029 March 2023 Submittal of Response to Request for Additional Information Regarding Results of Steam Generator Tube In-Service Inspection ULNRC-06805, Transmittal of Special Report 2023-02 Non-Functionality of Containment Hydrogen Analyzer Channel for Greater than 30 Days2023-03-21021 March 2023 Transmittal of Special Report 2023-02 Non-Functionality of Containment Hydrogen Analyzer Channel for Greater than 30 Days ULNRC-06802, Special Report 2023-01 (PAM Report); Non-Functionality of a Post-Accident Monitoring Instrument2023-03-0909 March 2023 Special Report 2023-01 (PAM Report); Non-Functionality of a Post-Accident Monitoring Instrument ULNRC-06795, Submittal of Fitness for Duty Reports for 2022, Including Single Positive Test Forms2023-01-24024 January 2023 Submittal of Fitness for Duty Reports for 2022, Including Single Positive Test Forms ULNRC-06794, Submittal of Fitness for Duty Program Data for 20222023-01-24024 January 2023 Submittal of Fitness for Duty Program Data for 2022 ULNRC-06787, Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)2022-12-0808 December 2022 Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015) ULNRC-06781, License Amendment Request to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2022-12-0101 December 2022 License Amendment Request to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) ULNRC-06780, Additional Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505, LDCN 20-0072022-11-30030 November 2022 Additional Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505, LDCN 20-007 ULNRC-06772, 10 CFR 50.59 and 10 CFR 72.48 Summary Report2022-11-23023 November 2022 10 CFR 50.59 and 10 CFR 72.48 Summary Report ULNRC-06777, Operating Quality Assurance Manual (Oqam) Revision 362022-11-16016 November 2022 Operating Quality Assurance Manual (Oqam) Revision 36 ULNRC-06779, ULNRC-06779: Contesting of Green NCV 05000483/2022010-03, Failure to Perform Required Inservice Testing of Residual Heat Removal Heat Exchanger Pneumatically (Air) Operated Outlet and Bypass Valves2022-11-14014 November 2022 ULNRC-06779: Contesting of Green NCV 05000483/2022010-03, Failure to Perform Required Inservice Testing of Residual Heat Removal Heat Exchanger Pneumatically (Air) Operated Outlet and Bypass Valves ULNRC-06765, License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Testing Frequencies (LDCN 2020-0004)2022-11-0303 November 2022 License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Testing Frequencies (LDCN 2020-0004) ULNRC-06773, Results of Steam Generator Tube In-Service Inspection2022-11-0101 November 2022 Results of Steam Generator Tube In-Service Inspection ULNRC-06775, Submittal of Non-Functionality of Loose-Part Detection System Channel for Greater than 30 Days2022-10-27027 October 2022 Submittal of Non-Functionality of Loose-Part Detection System Channel for Greater than 30 Days ULNRC-06771, Correction to Application to Revise Technical Specifications to Adopt TSTF 577, Revised Frequencies for Steam Generator Tube Inspections (LDCN 21-0013)2022-10-25025 October 2022 Correction to Application to Revise Technical Specifications to Adopt TSTF 577, Revised Frequencies for Steam Generator Tube Inspections (LDCN 21-0013) ULNRC-06770, Cycle 25 Commitment Change Summary Report2022-10-19019 October 2022 Cycle 25 Commitment Change Summary Report ULNRC-06766, Correction of Text Contained in Enclosures Provided with Supplements to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)2022-09-0808 September 2022 Correction of Text Contained in Enclosures Provided with Supplements to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014) ULNRC-06767, Presentation Information for Pre-Application Meeting Regarding New License Amendment Request for Use of Framatome Fuel Assemblies2022-09-0606 September 2022 Presentation Information for Pre-Application Meeting Regarding New License Amendment Request for Use of Framatome Fuel Assemblies ULNRC-06764, Revised Response to Request for Additional Information Regarding License Amendment Request for Adoption Off Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)2022-09-0101 September 2022 Revised Response to Request for Additional Information Regarding License Amendment Request for Adoption Off Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015) ULNRC-06763, Supplement to Application to Revise Technical Specifications to Adopt TSTF 577, Revised Frequencies for Steam Generator Tube Inspection (LDCN 21-0013)2022-09-0101 September 2022 Supplement to Application to Revise Technical Specifications to Adopt TSTF 577, Revised Frequencies for Steam Generator Tube Inspection (LDCN 21-0013) ULNRC-06762, Submittal of Owner'S Activity Reports (OAR-1 Forms) for Cycle/Refuel 252022-08-25025 August 2022 Submittal of Owner'S Activity Reports (OAR-1 Forms) for Cycle/Refuel 25 ULNRC-06758, Union Electric Co. - Renewed Facility Operating License NPF-30, Withdrawal of License Amendment Request and Exemption Request Regarding Transition to Framatome Fuel (LDCN 22-0002)2022-08-0404 August 2022 Union Electric Co. - Renewed Facility Operating License NPF-30, Withdrawal of License Amendment Request and Exemption Request Regarding Transition to Framatome Fuel (LDCN 22-0002) ULNRC-06755, Response to Requests for Additional Information for Proposed Revision to Radiological Emergency Response Plan Regarding Response and Notification Goals2022-07-13013 July 2022 Response to Requests for Additional Information for Proposed Revision to Radiological Emergency Response Plan Regarding Response and Notification Goals ULNRC-06754, Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications2022-07-0505 July 2022 Response to Request for Additional Information Regarding Licensee Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications ULNRC-06739, Post-Audit Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505 (LDCN 20-0007)2022-06-30030 June 2022 Post-Audit Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505 (LDCN 20-0007) ULNRC-06752, Evacuation Time Estimates Report2022-06-27027 June 2022 Evacuation Time Estimates Report ULNRC-06753, Presentation Information for Pre-Submittal Meeting Regarding Updated Spent Fuel Criticality Safety Analysis2022-06-23023 June 2022 Presentation Information for Pre-Submittal Meeting Regarding Updated Spent Fuel Criticality Safety Analysis ULNRC-06750, Submittal of Cycle 26 Core Operating Limits Report (COLR)2022-06-13013 June 2022 Submittal of Cycle 26 Core Operating Limits Report (COLR) ULNRC-06735, Response to Request for Additional Information Regarding Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004-02 (LDCN 19-0014).2022-05-27027 May 2022 Response to Request for Additional Information Regarding Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004-02 (LDCN 19-0014). 2024-01-29
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~ ~meren MISSOURI Callaway Plant Marc h 28, 2019 ULNRC-06497 U.S. Nuclear Regulatory Commission Attn; Document Control Desk Washington, DC 20555-0001 10 CFR 50.46 Ladies and Gentlemen:
DOC KET NUlVIBER 50-483 CALL AWAY PLAN T UNIT 1 UNIO N ELEC TRIC CO.
RENE WED FACI LITY OPERATING LICE NSE NPF-30 10 CFR 50.46 ANN UAL REPO RT ECCS EVAL UATI ON MOD EL REVI SION S Ameren Missouri hereby submits the annual report required per 10 CFR 50.46(a)(3) for Callaway Plant. Attachment 1 to this letter describes changes to the Westi nghouse ECCS Large Break and Small Break Loss of Coolant Accident (LOCA) Evaluation Mode ls which have been implemented for Callaway during the time pe1iod from March 2018 to March 2019.
Attacluuent 2 provides an ECCS Evalnation Model Margin Assessment which accounts for all peak cladding temperature (PCT) changes resulting from the resolutinn of prior issues as they apply to Callaway. No new PCT penalties are included in these attachments .
References 1 through 13 provided annual 10 CFR 50.46 report s that were issued after the LOCA analysis were revised to reflect the installation of the replacemen t steam generators in 2005. The PCT values detennined in the Large Break and Small Break LOCA analysis of record , when combined with all PCT margin allocations, remain below the 2200°F regulatory limit. Howe ver, in March 2014 Amer en Missouri was informed by Westinghouse that the absolu te magnih1de of the Large Break Loss of Coolant Accident (LBLOCA) penalty assessments that have accumulated since the cunen t analysis of record (replacement steam generator analysis approved in Callaw ay License Amen dmen t 168) e ceeded 50°F. As such, Reference 9 was submitted within the requirements of 10 CFR 50.46(a)(3)(ii), and contains a commitment to reanalyze the Large Break and Sma11 Break Loss of Coolant Accidents using the NRC-approved version ofWC AP-1 6996- P, "Realistic LOCA Evalu ation Methodology Applied to the Full Spectrum of Break Sizes (FUL L SPECTRUM LOCA Methodology)". This reanalysis will be completed on a sched ule to be detennined as part of the 10 CFR 50.46c rulemakiug process .
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ULNRC-06497 Marc11 28, 2019 Page 2 of 4 Th.is letter does not contain new commitments. If you have any questions on this report, please contact Mr. Tom Elwood at (314) 225-1905.
Sincerely, id!- Manger, Regulatory Affairs JBL
References:
- 1) ULNRC-05260 dated 3-9-06
- 2) ULNRC-05 378 dated 3-7-07
- 3) ULNRC-05475 dated 3-4-08
- 4) ULNRC-05600 dated 3-4-09
- 5) ULNRC-05683 dated 3-1-10
- 6) ULNRC-05769 dated 3-1-1 l
- 7) ULNRC-05840 dated 3-1-12
- 8) ULNRC-05968 dated 3-6-13 9 ULNRC-06098 dated 3-25-14
- 10) ULNRC-06203 dated 3-31-15
- 11) ULNRC-06292 dated 3-30-16
- 12) ULNRC-06361 dated 3-30-17
- 13) ULNRC-06428 dated 3-29-18 Attachments;
- 1. Changes to the Westinghouse ECCS Evaluation Model and PCT Penalty Assessments
- 2. ECCS Evaluation Model Margin Assessment for Callaway
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ULNRC-06497 March 28, 2019 Page 3 of 4 cc: Mr. Scott A. M01Tis Regional Administrator U. S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. L. John Klos Project Manager, Callaway Plant Office ofNudear Reactor Regulation U. S. Nuclear Regulatory Corrunission Mail Stop 09£3 Washington, DC 20555-0001
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ULNRC-0649 7 March 28 2019 Page 4 of 4 Index and send hardcopy to QA File A160.0761 Hardcopy:
Certrec Corporation 6100 Western Place, Suite 1050 Fort Worth, TX 76107 Electronic distribution fo1* the following can be made via Other Situations ULNRC Distribution:
F. M . Diya T. E . Herrmam1 B. L. Cox.
F. J. Bianco S. P. Banker R. C. Wink T . B. Elwood Corporate Communicati ons NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittinan LLP)
Missouri Public Service Conunission
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to ULNRC-06497 ATTACHMENT ONE CHANGES TO THE WESTINGHOUSE ECCS EVALUATION MODEL AND PCT PENALTY ASSESSMENTS 1
Attachment l to ULNRC-06497 TABLE OF CONTENTS
- 1. FUEL ROD GAP CONDUCTANCE ERROR
- 2. RADIATION HEAT TRANSFER MODEL ERROR
- 3. SBLOCTA PRE-DNB CLADDING SURFACE HEAT TRANSFER COEFFICIENT CALCULATION
- 4. GENERAL CODE MAINTENANCE 2
to ULNRC-0649 7
- 1. FUEL ROD GAP CONDUCTANCE ERROR An en-or was identified in the fuel rod gap conductance model in the NOTRUMP computer code (reactor coolant system response model) . The error is associated with the use of an incon-ect temperature in the calculation of the cladding emissivity term. This e1rnr corresponds to a Non-Discretionary Change as described in Section 4.1.2 of WCAP-13451..
Based on a combination of engineering judgment of the phenomena and physics of a small break LOCA and sensitivity calculations performed with the advanced plant version ofNOTRUMP , Westinghouse has concluded that this e1TOr has a negligible effect, leading to an estimated Peak Cladding Temperature (PCT) impact of 0°F on small break LOCA analysis results .
- 2. RADIATION HEAT TRANSFER MODEL ERROR Two enors were discovered in the calculation of the radiation heat transfer coefficient within the fuel rod model of the NOTRUMP computer code (reactor coolant system response model) . First, existing logic did not preclude non-physical negative or large (negative or positive) radiation heat transfer coefficients from being calculated. These en-oneous calculations occuned when the vapor temperature exceeded the cladding surface temperature or when the predicted temperature difference was less than 1 °F. Second, a temperature tenn incorrectly used degrees Fahrenheit instead of Rankine. These errors represent a closely related group of Non-Discretio nary problems in accordance wfth Section 4.1.2 of WCAP-13451 .
Based on a combination of engineering judgment of the phenomena and physics of a small break LOCA, and sensitivity calculations perfonned with the advanced plant version ofNOTRUMP , Westinghouse has concluded that this error has a negligible effect, leading to an estimated Peak Cladding Temperature (PCT) impact of 0°F on small break LOCA analysis resl.llts.
- 3. SBLOCTA PRE-DNB CLADDING SURFACE HEAT TRANSFER COEFFICIENT CALCULATION Two e1rnrs were discovered in the pre-departure from nucleate boiling {pre-DNB) cladding surface heat transfer coefficient calculation in the SBLOCTA code ( cladding heat-up ca1culatfons) . The first enor is a result of inconsistent time units (hours vs . seconds) in the parameters used for the calculation of the Reynolds and Prandtl numbers, and the second en-or relates to an inconect diameter used to develop the area tenn in the cladding smface heat flux calculation. Both of these issues impact the calculation of the pre-DNB convective heat transfer coefficient, representing a closely related group of Non-Discretio nary Changes to the Evaluation Model as described in Section 4.1 .2 of WCAP-13451 .
These enors have been con-ected in the SBLOCTA code. Because this condition occurred prior to DNB , it was judged that these e1Tors l1ad nci direct impact on the cladding heat-up related to the core uncover period. A series of validation tests were perfonned by Westinghouse and confirmed that tbese errors have a negligible effect on SBLOCA analysis results, leading to an estimated Peak Cladding Temperature (PCT) impact of 0°F.
3 to ULNRC-06497
- 4. GENERAL CODE MAINTENANCE Various changes have been made to enhance the usability of the codes and to help preclude errors in analyses. This includes items *such as modifying input variable definitions, ututs, and defaults; improving the input diagnostic checks* enhancing the code output; optimizing active coding; and eliminating inactive coding. These changes have been evaluated for impact on existing Small Break LOCA analysis results and they represent Discretionary Changes that will be implemented on a forward-fit basis in accordance with Section 4.1.1 of WCAP-1345.
Westinghouse has judged tlus issue to have an estimated PCT impact of 0°F on existing Small Break LOCA analysis results.
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Attaclu11ent 2 to ULNRC-06497 ATTACHME NT TWO ECCS EVALUATION MODEL MARGIN ASSESSMENT FOR CALLAWAY to ULNRC-0649 7 LARGE BREAK LOC A A. ANALYSIS OF RECORD (AOR) PCT = 1939°F B. PRIOR ECCS MODEL ASSESSMEN TS + 58°F C. CURRENT LOCA MODEL ASSESSMEN TS - + oop March 2018 LICENSING BASIS PCT + MARGIN ALLOCATIO NS 1997°F ABSOLUTE MAGNITUD E OF MARGIN ALLOCATIO NS 5gop SINCE LAST ANALYSIS OF RECORD OR LBLOCA 30-DA Y REPORT 2
to ULNRC-06497 SMALL BREAK LOCA A. ANALYS1S OF RECORD (AOR) PCT= 1043°F B. PRIOR ECCS MODEL ASSESSMEN TS + oop C. CURRENT ECCS MODEL ASSESSMENTS - + 0°F March2018 LICENSING BASIS PCT+ MARGIN ALLOCATIONS 1043°F ABSOLUTE MAGNITUD E OF MARGIN ALLOCATIONS 0°F SINCE LAST ANALYSIS OF RECORD OR SBLOCA 30-DAY REPORT 3