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Results
Other: CNS-14-131, WCAP-17669-NP, Revision 0, Catawba Unit 1 Measurement Uncertainty Recapture (Mur) Power Uprate: Reactor Vessel Integrity and Neutron Fluence Evaluations, CNS-15-024, WCAP-17993-NP, Revision 0-B, Justification for the Use of RAPTOR-M3G for the Catawba, Unit 1, Measurement Uncertainty Recapture (Mur) Power Uprate Fluence Evaluations., ML14353A028
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MONTHYEARML14353A0282013-04-30030 April 2013 WCAP-16083-NP, Revision 1, Benchmark Testing of the Ferret Code for Least Squares Evaluation of Light Water Reactor Dosimetry Project stage: Other ML14169A4932014-04-22022 April 2014 Core Operating Limits Report for Cycle 22, Revision 1. Part 1 of 2 Project stage: Request ML14169A3312014-06-13013 June 2014 Submittal of Core Operating Limits Report for Cycle 22, Revision 1 Project stage: Request CNS-14-076, License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate2014-06-23023 June 2014 License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate Project stage: Request CNS-14-131, WCAP-17669-NP, Revision 0, Catawba Unit 1 Measurement Uncertainty Recapture (Mur) Power Uprate: Reactor Vessel Integrity and Neutron Fluence Evaluations2014-06-30030 June 2014 WCAP-17669-NP, Revision 0, Catawba Unit 1 Measurement Uncertainty Recapture (Mur) Power Uprate: Reactor Vessel Integrity and Neutron Fluence Evaluations Project stage: Other CNS-14-098, License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate2014-08-26026 August 2014 License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate Project stage: Request ML14325A6672014-11-26026 November 2014 Request for Additional Information Regarding License Amendment Request to Support a Measurement Uncertainty Recapture Power Uprate for Catawba, Unit 1 Project stage: RAI ML14353A0272014-12-15015 December 2014 License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate/Response to NRC Requests for Additional Information (Rals) Project stage: Response to RAI ML15008A2732015-01-0808 January 2015 NRR E-mail Capture - Draft RAI for Mur (Steam Generator Branch) Project stage: Draft RAI CNS-15-007, License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate - Response to NRC Requests for Additional Information (Rals)2015-01-22022 January 2015 License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate - Response to NRC Requests for Additional Information (Rals) Project stage: Response to RAI ML15030A4602015-02-0909 February 2015 Request for Additional Information Regarding License Amendment Request to Support a Measurement Uncertainty Recapture Power Uprate Project stage: RAI CNS-15-024, WCAP-17993-NP, Revision 0-B, Justification for the Use of RAPTOR-M3G for the Catawba, Unit 1, Measurement Uncertainty Recapture (Mur) Power Uprate Fluence Evaluations.2015-04-23023 April 2015 WCAP-17993-NP, Revision 0-B, Justification for the Use of RAPTOR-M3G for the Catawba, Unit 1, Measurement Uncertainty Recapture (Mur) Power Uprate Fluence Evaluations. Project stage: Other ML15117A0112015-04-23023 April 2015 Response to NRC Requests for Additional Information (Rais) on License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate Project stage: Response to RAI ML15201A5122015-08-13013 August 2015 Request for Additional Information Regarding License Amendment Request to Support a Measurement Uncertainty Recapture Power Uprate for Catawba, Unit 1 Project stage: RAI ML15324A0832015-11-16016 November 2015 License Amendment Request (LAR) for Measurement Uncertainty Recapture (Mur) Power Uprate, Response to NRC Requests for Additional Information (Rais) Project stage: Response to RAI CNS-15-078, WCAP-18060-NP, Revision 1, Response to RAIs Concerning the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture (Mur) Power Uprate Fluence Evaluations2015-11-30030 November 2015 WCAP-18060-NP, Revision 1, Response to RAIs Concerning the Use of RAPTOR-M3G for the Catawba Unit 1 Measurement Uncertainty Recapture (Mur) Power Uprate Fluence Evaluations Project stage: Response to RAI 2014-08-26
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Category:Letter
MONTHYEARML24255A8312024-09-23023 September 2024 Project Manager Assignment ML24261B9782024-09-19019 September 2024 Notification of an NRC Fire Protection Team Inspection NRC Inspection Report 05000413-2024010, 05000414-2024010 and Request for Information IR 05000413/20243012024-09-16016 September 2024 Operator Licensing Examination Approval 05000413/2024301 and 05000414/2024301 IR 05000414/20240912024-09-0505 September 2024 Final Significance Determination of a White Finding and Nov and Assessment Followup Letter-NRC Inspection Report 05000414-2024091 IR 05000413/20240052024-08-26026 August 2024 Updated Inspection Plan for Catawba Nuclear Station (Report 05000413/2024005 & 05000414/2024005) ML24235A1542024-08-22022 August 2024 Notification of Target Set Inspection and Request for Information (NRC Inspection Report 05000413-2024402 and 05000414-2024402) IR 05000413/20240022024-08-0808 August 2024 Integrated Inspection Report 05000413-2024002 and 05000414-2024002 and Apparent Violation IR 05000413/20244032024-08-0101 August 2024 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection 05000413/2024403; 05000414/2024403 ML24183A0972024-07-12012 July 2024 ISFSI; Catawba 1, 2 & ISFSI; McGuire 1, 2 & ISFSI; Oconee 1, 2, 3 & ISFSI; Shearon Harris 1; H. B. Robinson 2 & ISFSI; and Radioactive Package Shipping Under 10 CFR 71 (71-266 & 71-345) – Review of QA Program Changes EPID L-2024-LLQ-0002 ML24178A0552024-06-26026 June 2024 Requalification Program Inspection – Catawba Nuclear Station IR 05000414/20240902024-06-24024 June 2024 NRC Inspection Report 05000414/2024090 and Preliminary White Finding and Apparent Violation ML24170A8632024-06-11011 June 2024 Flowserve June 11, 2024, Part 21 Notification - Redacted Version for Publishing ML24149A1772024-05-28028 May 2024 NRC Response to Duke Energy 2025 FOF Schedule Change Request (Catawba and McGuire) ML24144A1162024-05-28028 May 2024 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML24141A0482024-05-17017 May 2024 EN 56958_1 Ametek Solidstate Controls, Inc IR 05000413/20240012024-05-10010 May 2024 Integrated Inspection Report 05000413/2024001 and 05000414/2024001 and Apparent Violation ML24095A1072024-04-0808 April 2024 – Review of the Spring 2023 Steam Generator Tube Inspection Report (C1R27) ML24017A0652024-03-0808 March 2024 Issuance of Amendment Nos. 319 and 315 to Technical Specification 3.7.11, Control Room Area Chill Water System (Cracws) IR 05000413/20230062024-02-28028 February 2024 Annual Assessment Letter for Catawba Nuclear Station Units 1 and 2 - (NRC Inspection Report 05000413/2023006 and 05000414/2023006) IR 05000413/20230042024-02-0202 February 2024 – Integrated Inspection Report 05000413-2023004 and 05000414-2023004 ML24005A2512024-01-26026 January 2024 Exemption from Select Requirements of 10 CFR Part 73 - Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting ML23317A3462023-11-14014 November 2023 Duke Fleet - Correction Letter to License Amendment Nos. 312 & 340 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000413/20230102023-10-11011 October 2023 NRC Inspection Report 05000413/2023010 and 05000414/2023010 ML23256A0882023-09-25025 September 2023 Issuance of Alternative to Steam Generator Welds ML23195A0782023-08-29029 August 2023 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000413/20230052023-08-25025 August 2023 Updated Inspection Plan for Catawba Nuclear Station Units 1 and 2 (Report 05000413/2023005 and 05000414/2023005) ML23233A1692023-08-17017 August 2023 EN 56683 - Curtiss Wright, Interim Notification Report for PotentialPurt2l IR 05000413/20230022023-07-25025 July 2023 Integrated Inspection Report 05000413/2023002 and 05000414/2023002 ML23207A0762023-07-14014 July 2023 EN 56557 - Update to Part 21 Report Re Potential Defect with Trane External Auto/Stop Emergency Stop Relay Card Pn: XI2650728-06 ML23237A2672023-06-13013 June 2023 June 13, 2002 - Meeting Announcement - McGuire and Catawba Nuclear Stations 50-369, 50-370 and 50-413, 50-414 ML23159A0052023-06-0505 June 2023 56557-EN 56557 - Paragon - Redlined IR 05000413/20230012023-05-0505 May 2023 Integrated Inspection Report 05000413/2023001 and 05000414/2023001 ML23118A0762023-05-0101 May 2023 Approval for Use of Specific Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI IR 05000413/20230112023-04-25025 April 2023 Focused Engineering Inspection Report 05000413/2023011 and 05000414/2023011 ML23107A2542023-04-14014 April 2023 301 Examination Report Letter and Report (Merged) ML22332A4932023-03-10010 March 2023 William States Lee III 1 and 2 - Issuance of Amendments Regarding the Relocation of the Emergency Operations Facility IR 05000413/20234012023-03-0101 March 2023 Security Baseline Inspection Report 05000413 2023401 and 05000414 2023401 IR 05000413/20220062023-03-0101 March 2023 Annual Assessment Letter for Catawba Nuclear Station, Units 1 and 2 (NRC Inspection Report 05000413/2022006 and 05000414/2022006) IR 05000413/20233012023-02-17017 February 2023 Operator Licensing Examination Approval 05000413/2023301 and 05000414/2023301 IR 05000413/20220042023-01-31031 January 2023 Integrated Inspection Report 05000413/2022004 and 05000414/2022004 IR 05000413/20220112022-12-15015 December 2022 Biennial Problem Identification and Resolution Inspection Report 05000413/2022011 and 05000414/2022011 ML22356A0512022-12-14014 December 2022 Curtiss-Wright Nuclear Division, Letter Regarding Potential Efect in a Configuration of the 11/2 Inch Quick Disconnect Connector Cable Assemblies Supplied to Duke Energy (See Attached Spreadsheet) for a Total of 460 of Connectors Only Suppl ML22096A0032022-11-18018 November 2022 McGuire Nuclear Station and Shearon Harris Nuclear Power Plant Authorization of RA-19-0352 Regarding Use of Alternative for RPV Head Closure Stud Examinations IR 05000413/20224032022-11-17017 November 2022 Cyber Security Inspection Report 05000413/2022403 and 05000414/2022403 (Public) ML22256A2532022-11-14014 November 2022 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-541, Rev. 2 ML22319A0942022-11-10010 November 2022 EN 56219 - Flowserve. 10 CFR Part 21 Report 38878-8 Solenoid Valve at Duke, Catawba Flowserve Evaluation 105 IR 05000414/20220032022-10-31031 October 2022 Integrated Inspection Report 05000414/2022003 and 05000414/2022003 IR 05000413/20224022022-10-28028 October 2022 Security Baseline Inspection Report 05000413 2022402 and 05000414 2022402 ML22297A2642022-10-25025 October 2022 Project Manager Assignment ML22276A2492022-10-25025 October 2022 Completion of License Renewal Commitment No. 10, Aging Management of Environmentally Assisted Fatigue 2024-09-05
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24197A1702024-07-15015 July 2024 Request for Additional Information Two Proposed Alternatives (RA-23-0242) for the Inspection of Reactor Vessel Closure Head Penetrations ML24150A1662024-05-29029 May 2024 Document Request for Catawba Nuclear Station Units 1 & 2 - Radiation Protection Inspection - Inspection Report 2024-03 ML23271A1792023-09-28028 September 2023 Request for Confirmation License Amendment Application to Revise Control Room Cooling TS 3.7.11 ML23151A3482023-05-30030 May 2023 Duke Fleet - Request for Additional Information Proposed Alternative for Pressurizer Welds in Accordance with 10 CFR 50.55a(z)(1) ML23142A2732023-05-22022 May 2023 Duke Fleet - Request for Additional Information Proposed Alternative for Steam Generator Welds in Accordance with 10 CFR 50.55a(z)(1) ML22336A0692022-11-28028 November 2022 Final 2023 Catawba Nuclear Station (CNS) Commercial Grade Dedication (CGD) Inspection Information Request ML22154A1312022-06-0303 June 2022 NRR E-mail Capture - Catawba Nuclear Station, Units 1 and 2 - Request for Additional Information Environmentally-Assisted Fatigue License Renewal Commitment ML22115A1412022-04-25025 April 2022 NRR E-mail Capture - Duke Common EOF Relocation - Request for Addition Information ML22102A2962022-04-13013 April 2022 Request for Withholding Information from Public Disclosure Response to Request for Additional Information ML22063B1782022-03-0909 March 2022 Request for Additional Information Regarding LAR for Revision to the Conditional Exemption of the End of Cycle Moderator Temperature Coefficient Measurement Methodology (EPID L-2021-LLA-0198) NON-PROPRIETARY ML22024A1122022-01-24024 January 2022 2022 CNS POV Inspection Information Request ML21354A8612021-12-15015 December 2021 NRR E-mail Capture - Request for Additional Information - Duke Fleet Request RA-19-0352 - Alternative for RPV Closure Stud Exams (L-2020-LLR-0156) ML21335A2252021-12-0101 December 2021 NRR E-mail Capture - Catawba Nuclear Station, Unit 2 - Request for Additional Information Spring 2021 Steam Generator Tube Inspection Report (L-2021-LRO-0043) ML21117A1232021-04-23023 April 2021 NRR E-mail Capture - Catawba Verbal Relief Request Request for Additional Information ML21075A0032021-03-12012 March 2021 Emergency Preparedness Exercise Inspection Request for Information for - Brunswick, Catawba, North Anna, Oconee, Vogtle 1 & 2 ML21049A2632021-02-0404 February 2021 NRR E-mail Capture - Request for Additional Information - Duke Energy Fleet License Amendment Request to Revise Emergency Plan ML20346A0212020-12-10010 December 2020 NRR E-mail Capture - Formal Release of RAIs - License Amendment to Change TS 3.8.1 Due Jan. 29, 2021 ML20338A3932020-12-0303 December 2020 Notification of Inspection and Request for Information ML20323A4072020-11-18018 November 2020 NRR E-mail Capture - Request for Additional Information - Brunswick License Exemption Request from 10CFR73 Annual Force on Force Exercise Requirements (EPIC L-2020-LLE-0180) ML20244A0462020-08-31031 August 2020 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML20073F3832020-03-13013 March 2020 NRR E-mail Capture - Request for Additional Information - Catawba Nuclear Station - SG Report (RA-19-0391) - C2R23 ML20050D3382020-02-21021 February 2020 Letter RAI 1 MAGNASTOR-Catawba and McGuire Exemptions with Enclosure ML20052E4282020-02-21021 February 2020 Notification of NRC Fire Protection Team Inspection (Fpti) (NRC Inspection Report 05000412/2020013 and 05000414/2020013) and Request for Information ML20003E5372020-01-0303 January 2020 NRR E-mail Capture - Catawba PT Limits LAR - RAIs ML19032A5842019-01-31031 January 2019 Emergency Preparedness Program Inspection Request for Information ML19011A1372019-01-10010 January 2019 NRR E-mail Capture - Duke Energy Fleet RAIs - Relief Request 18-GO-001 - Proposed Alternative for Depth Sizing Qualification Examination of Welds (L-2018-LLR-0117) ML19009A5412019-01-0909 January 2019 NRR E-mail Capture - Request for Additional Information - Catawba Nuclear Station, Units 1 and 2 - Esps LAR ML19007A3422018-12-21021 December 2018 NRR E-mail Capture - Duke Energy Fleet Draft RAIs - Relief Request 18-GO-001 - Proposed Alternative for Depth Sizing Qualification Examination of Welds (L-2018-LLR-0117) ML18068A5052018-03-0909 March 2018 NRR E-mail Capture - Request for Additional Information - Catawba Nuclear Station, Units 1 and 2 - Nsws Return Pond Header LAR (CACs MG0245 and MG0246, EPID L-2017-LLA-0297) ML18058B2062018-02-27027 February 2018 Notification of Inspection and Request for Information ML18057A2182018-02-23023 February 2018 Enclosurequest for Additional Information (Letter to A. Zaremba Request for Additional Information for Review of Duke Energy'S Decommissioning Funding Plan Update) ML17335A0972017-11-29029 November 2017 NRR E-mail Capture - Request for Additional Information - Catawba Nuclear Station, Units 1 and 2 - Relief Request 17-CN-001 (CACs MF9807 and MF9808, EPID L-2017-LLR-0032) ML17135A0302017-05-12012 May 2017 NRR E-mail Capture - Request for Additional Information - Catawba TSTF-197 ML17115A1422017-04-25025 April 2017 NRR E-mail Capture - Request for Additional Information - Catawba SG Report - RFO 21 ML16337A3322017-01-12012 January 2017 Request for Additional Information Regarding License Amendment Request for Electrical Power System Alignments for Shared Systems ML16355A3922016-12-29029 December 2016 Request for Additional Information Regarding License Amendment Request to Implement a Risk-Informed, Performance-Based Fire Protection Program ML16292A2252016-10-14014 October 2016 Emergency Preparedness Inspection and Request for Information ML16271A0752016-10-12012 October 2016 Request for Additional Information Regarding License Amendment Request for Electrical Power System Alignments for Shared Systems ML16222A7472016-08-0909 August 2016 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML16205A0022016-07-21021 July 2016 Notification of Inspection and Request for Information ML16187A0662016-07-0707 July 2016 Catawba Nuclear Station, Units 1 and 2 - Request for Additional Information Regarding License Amendment Request to Implement a Risk-Informed, Performance-Based Fire Protection Program (CAC Nos. MF2936 and MF2937) ML16111B2472016-04-28028 April 2016 Request for Additional Information Re. License Amendment Request to Revise TS 5.5.2 Containment Leakage Rate Testing Program ML16120A0872016-04-27027 April 2016 Notification of Inspection and Request for Information ML16113A0732016-04-22022 April 2016 Draft RAIs License Amendment Request to Revise TS Section 5.5.2 for Permanent Extension of Type a and Type C Leak Rate Test Frequencies ML16007A1902016-01-20020 January 2016 Request for Additional Information Regarding License Amendment Request to Change the RCS Minimum Required Flow Rates ML16014A7102016-01-20020 January 2016 Request for Additional Information Regarding License Amendment Request to Revise Emergency Action Level Scheme ML15348A2602015-12-17017 December 2015 Request for Additional Information Regarding License Amendment Request to Use an Alternative Fission Gas Gap Release Fraction ML15320A3862015-11-19019 November 2015 RAI LAR to Adopt TSTF-523 ML15314A3562015-11-10010 November 2015 E-mail from J. Whited to A. Zaremba Duke Energy Draft RAIs License Amendment Request to Adopt TSTF-523 (CAC Nos. MF6413-MF6422) ML15314A3592015-11-10010 November 2015 Duke Energy Draft RAIs Request to Adopt TSTF-523 (CAC Nos. MF6413-MF6422) 2024-07-15
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Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001
- Mr. Kelvin Henderson Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC 4800 Concord Road York, NC 297 45 August 13, 2015
SUBJECT:
CATAWBA NUCLEAR STATION, UNITS 1AND2: REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST TO SUPPORT A MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE FOR CATAWBA, UNIT 1 (TAC NOS. MF4526 AND MF4527)
Dear Mr. Henderson,
By letter dated June 23, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 14176A109}, Duke Energy Carolinas, LLC submitted a license amendment request to increase the Catawba, Unit 1, authorized core power level from 3,411 megawatts thermal (MWt) to 3,469 MWt, an increase of approximately
- 1. 7 percent rated thermal power. The U.S. Nuclear Regulatory Commission (NRG) staff has reviewed the licensee's submittal and determined that additional information is needed in order to complete the NRG staff's review .. Enclosure 1 describes this request for additional information.
The NRG staff requests a . response form Duke within 90 days from the date of this letter.
- The NRG staff notes that the RAls identified with the prefix SRXB relate to the review of the new neutron fluence methodology incorporated in the LAR. *,
- K. Henderson If you have any questions, please call me at 301-415-2481.
Docket Nos. 50-413 and 50-414
Enclosure:
As stated cc w/encl: Distribution via Listserv Sinc:et .. J ff ,a'1 . G. Edward Miller, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation REQUEST FOR ADDITIONAL INFORMATION UCENSEAMENDMENTREQUESTTOSUPPORTTHE MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE DUKE ENERGY CAROLINAS, LLC CATAWBA NUCLEAR STATION, UNITS 1AND2 DOCKET NOS. 50-413AND 50-414 TAC NOS. MF4526 AND MF4527 By letter dated June 23, 2014, Duke Energy Carolinas, LLC, the licensee for Catawba Nuclear Station, Units 1 and 2 (Catawba), requested a measurement uncertainty recapture (MUR) power uprate (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 14176A109).
The proposed revision would increase the Catawba, Unit 1, authorized.
core power level from 3411 megawatts thermal (MWt) to 3469 MWt, an increase of 1. 7 percent rated thermal power (RTP). Based on the review of the amendment request, the NRC staff has determined that additional information is required regarding the MUR power uprate . . Reactor Systems Branch (SRXB) -RAI 8 SRXB-RAI 11 The basis of review for RAPTOR-M3G is Regulatory Guide (RG) 1.190, "Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence." RG 1.190 intends to ensure the accuracy and reliability of the neutron fluence determination required by General Design Criteria (GDC) related to the reactor coolant pressure boundary.
RG 1.190 describes methods and assumptions acceptable to the NRC staff for determining the pressure vessel. neutron fluence. RG 1.190 specifies that the neutron transport methods should be benchmarked to a statistically significant data base of measurement-to-calculation ratios (M/C) and that an overall neutron fluence bias and uncertainty be estimated.
The NRC. staff requests that the licensee provide an explanation for how RAPTOR-M3G satisfies this portion of RG 1.190. SRXB-RAI 12 In Section IV.1.C.ii of the application, the licensee states that Westinghouse has evaluated the latest-available ENDF/B-Vll-based cross-section data contained in the BUGLE-B7 library and the results of this evaluation indicate no significant differences between the results of analyses performed using two different cross-section data. This evaluation can be found in Appendix B of WCAP-16083-NP, Revision 1, "Benchmark Testing of the FERRET Code for Least Squares Enclosure Evaluation of Light Water Reactor Dosimetry," dated April 2013. Appendix Bin WCAP-16083-NP, Revision 1, discusses the evaluation of the two cross-section sets by Oak Ridge National Laboratory for applications related to fluence. However, the Westinghouse evaluation only refers to work related to low-energy neutrons.
There is an apparant conflict between statements made ir:i the application and Appendix 8 of WCAP-16083-NP, Revision 1, with respect to the Westinghouse evaluation of two multi-group cross section libraries.
The NRC staff requests that the licensee clarify the statements or provide a revision of the relevant paragraph in Section IV.1.C.ii of the application and/or Appendix B ofWCAP-16083-NP, Revision 1. SRXB-RAI 13 I The use of Sa angular quadrature is generally acceptable according to RG 1.190. However, RG 1.190 states that when off-midplane locations are analyzed, the adequacy of the Sa quadrature to determine the streaming component must be demonstrated with higher-order Sn calculations.
It is noted for Catawba, Unit 1, that one of the limiting locations is near the extended beltline.
The analysis of Catawba, Unit 1, for the MUR includes an angular discretization "modeled with an Sa order of angular quadrature or higher." Since some of the locations of interest are on the extended beltline, it must be shown that the angular quadrature for those calculations .is adequate.
The NRC staff requests that the licensee provide the angular quadrature used for the locations that are off-midplane.
Additionally, the NRC staff requests that the licensee provide a justification for the angular quadrature.
SRXB-RAI 14 RG 1.190 requires that the neutron fluence methodology be qualified, and flux uncertainty estimates be determined.
One component of the uncertainty is from the analytical sensitivity studies. The important sources of "analytical uncertainty" .are listed in RG 1.190, Section 1.4.1, "Analytic Uncertainty Analysis." The analytical sensitivity studies using RAPTOR-M3G are important in determining the overall uncertainty in neutron fluence calculations:
The NRC staff requests that the licensee provide justification for the parameters that are important to performing neutron fluence analysis.
Additionally, the NRC staff requests that the licensee provide the resulting uncertainties for each parameter and all parameters combined.
SRXB-RAI 15 The Pool Critical Assembly (PCA) benchmark is a full-scale section mockup of a pressure vessel with dosimetry measurements at the inner surface of the pressure vessel, and at locations within the pressure vessel wall. The PCA benchmark is one of the three suggested RG 1.190 benchmarks for pressure vessel simulator measurements.
The PCA benchmark has been calculated using both TORT and RAPTOR-M3G with identical assumptions an.d the codes produced identical results. The spatial differencing in RAPTOR-M3G can be performed using either theta-weighted (TW) or directional theta-weighted (DTW) options. For the direct comparisons with TORT, the TW option is used in RAPTOR-M3G as TORT does not have the DTW option. The DTW is the normal option used in the Catawba neutron fluence analysis using RAPTOR-M3G.
In order to determine the M/C ratios based .on the PCA measurements, RAPTOR-M3G should be used with the DTW option. The NRC staff requests that the licensee provide RAPTOR-M3G results for the PCA benchmark, as part of the code validation, using the same modeling assumptions used for the Catawba neutron fluence calculations. SRXB-RAI 16 The analysis of the H.B. Robinson benchmark using RAPTOR-M3G is provided in Appendix A of WCAP-16083-NP, Revision 1. The analysis is performed using Ps expansion of the scattering kernel and an S12 angular quadrature as compared to Ps and Ss quadratures used in the Catawba neutron fluence analysis.
In Section A.2 of WCAP-16083-NP, Revision 1, it is stated that the results in Appendix A made no attempt to address power redistribution effects over the course of the fuel cycle when calculating measured reaction rates at saturation, whereas the results presented in Section 3.3 did consider power redistribution.
The analysis of the benchmark is atypical, although there is good agreement with the data. The NRC staff
- requests that the licensee provide the results for the H.B. Robinson benchmark using the standard methodology used for the Catawba neutron fluence analysis for qualification of RAPTOR-M3G.
SRXB-RAI 17 The comparisons of RAPTOR-M3G calculations with capsule data are discussed in Appendix A of WCAP-16083-NP, Revision 1, and in Appendix C of WCAP-17669-NP, Revision 0, "Catawba Unit 1 Measurement Uncertainty Recapture (MUR) Power Uprate: Reactor Vessel Integrity and Neutron Fluence Evaluations," dated June 2013 (ML 14353A029).
A requirement of RG 1.190 is that the uncertainty and bias in the neutron fluence calculations be assessed based on three components:
surveillance measurements, benchmarks, and analytical sensitivity .studies.
a) The NRC staff requests that the licensee provide an explanation for how each component of uncertainty will be weighted to arrive at the uncertainty and bias for fast neutron fluence at the limiting vessel locations.
- b) The component of uncertainty and bias from comparisons of calculations with surveillance capsule data should be from a statistically significant number of measurements.
The NRC staff requests that the licensee provide a justification of the use of the database, used to assess RAPTOR-M3G, based' on its statistical significance.
Electrical Engineering Branch (EEEB) -RAI 8 In Duke Energy's RAI response dated January 22, 2015 for EEEB RAI 6, it stated that "Locations on Elevation 560' were existing EQ HARSH zones due to the overall Total Integrated Dose (TIO} with identified EO equipment.
Locations or:i Elevations 577' and 594' were existing EQ MILD zones that were projected to transition to EQ HARSH dose levels due to this issue." Please confirm that the replacer:nent of additional lead shielding.in the affected equipment areas would transition the locations on Elevations 577' and 594' back from EQ Harsh to EO Mild. In addition, please verify that with the addition of lead shielding on the Annulus Penetrations on Unit 1, locations on Elevations 577' and 594' will be within the TIO values listed iri the Catawba EQCM and are qualified for pre-MUR and post-MUR power uprate conditions.
If you have any questions, please call me at 301-415-2481.
Docket Nos. 50-413 and 50-414
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
Public RidsNrrDeEmcb
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RidsNrrPMCatawba (hard copy) ADAMS Accession No. ML 15201A512.
Sincerely, /RA/ G. Edward Miller, Project Manager . Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation LPL2-1 R/F
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/PM NRR/LPL2-1/LA NRR/DSS/SRXB NRR/DE/EEEB NRR/LPL2-1/BC NAME GE Miller SFigueroa CJackson JZimmerman RPascarelli DATE 08/12/15 08/13/15 08/12/15*
08/12/15 08/13/15 OFFICIAL RECORD COPY