Letter Sequence Request |
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MONTHYEARML22110A0972022-05-0909 May 2022
Regulatory Audit Plan in Support of Review of Defense in Depth and Diversity Common Cause Failure Coping Analysis
Project stage: Other
2022-05-09
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Category:Letter
MONTHYEARIR 05000352/20243012024-02-0202 February 2024
Initial Operator Licensing Examination Report 05000352/2024301 and 05000353/2024301
IR 05000352/20230042024-01-31031 January 2024
Integrated Inspection Report 05000352/2023004 and 05000353/2023004
IR 05000352/20240112024-01-31031 January 2024
Information Request to Support Post-Approval Site Inspection for License Renewal; Inspection Report 05000352/2024011
ML24026A2962024-01-26026 January 2024
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System (PPS)- Syrs, .
ML24004A0342024-01-17017 January 2024
Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0026 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting))
IR 05000352/20230102024-01-11011 January 2024
Age-Related Degradation Report 05000352/2023010 and 05000353/2023010
IR 05000352/20234012023-12-21021 December 2023
Cybersecurity Inspection Report 05000352/2023401 and 05000353/2023401
ML23321A2362023-12-14014 December 2023
Issuance of Amendment Nos. 262 and 224 Adoption of TSTF-477, Revision 3 and Associated Technical Specification Changes
ML23278A1292023-12-14014 December 2023
Units 1 & 2; Limerick, Units 1 & 2; Nine Mile Point, Units 1 & 2; and Peach Bottom, Units 2 & 3 -Revision to Approved Alternatives to Use Boiling Water Reactor Vessel and Internals Project Guidelines
ML23333A2182023-11-29029 November 2023
Operator Licensing Examination Approval
ML23325A2062023-11-21021 November 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System
ML23313A0432023-11-13013 November 2023
Summary of Regulatory Audit in Support of Amendment Request for Control Room Air Conditioning Technical Specifications
ML23317A1192023-11-10010 November 2023
Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums
IR 05000352/20230032023-10-27027 October 2023
Integrated Inspection Report 05000352/2023003 and 05000353/2023003 and Independent Spent Fuel Storage Installation Inspection 07200065/2023001
ML23297A1722023-10-24024 October 2023
Request for Information for a Biennial Problem Identification and Resolution Inspection; Inspection Report 05000352/2024010 and 05000353/2024010
IR 05000352/20235012023-10-17017 October 2023
Emergency Preparedness Biennial Exercise Inspection Report 05000352/2023501 and 05000353/2023501
RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023
Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans
ML23279A0612023-10-0505 October 2023
Paragon Energy Solutions LLC, Part 21 Final Report Re Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs)
ML23276A5162023-10-0303 October 2023
Federal Emergency Management Agency Level 1 Finding from 2023 Evaluated Emergency Preparedness Exercise
ML23275A1082023-09-29029 September 2023
FEMA Level 1 Findings Limerick NPP- Boyertown/Colebrookdale
ML23241A9452023-09-27027 September 2023
Generation Station, Units 1 and 2 Regulatory Audit Plan Supporting Review of the Equipment Qualification Portion of Limerick Digital Instrumentation and Controls License Amendment Request
ML23269A0522023-09-26026 September 2023
Request for Information and Notification of Conduct of IP 71111.21.N.04, Age-Related Degradation, Reference Inspection Report 05000352/2023010 and 05000353/2023010
ML23255A0952023-09-12012 September 2023
Resubmittal of License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System (PPS) to Address
ML23254A0242023-09-0606 September 2023
Paragon Energy Solutions LLC, Potential Defect with Eaton Jd and Hjd Series Molded Case Circuit Breakers (Mccbs)
ML23249A1002023-09-0606 September 2023
Requalification Program Inspection
IR 05000352/20230052023-08-31031 August 2023
Updated Inspection Plan for Limerick Generating Station, Units 1 and 2 (Report 05000352/2023005 and 05000353/2023005)
ML23248A2082023-08-31031 August 2023
UFSAR Cover Page
ML23242A2172023-08-30030 August 2023
Response to Request for Additional Information for Application to Adopt TSTF-477, Revision 3, Add Action for Two Inoperable Control Room AC Subsystems and Associated Technical Specification Changes
NMP2L2851, Relief Request Associated with Successive Inspections for Generic Letter 88-01 / BWRVIP-75-A Augmented Examinations2023-08-25025 August 2023
Relief Request Associated with Successive Inspections for Generic Letter 88-01 / BWRVIP-75-A Augmented Examinations
ML23228A0942023-08-16016 August 2023
Response to Request for Additional Information for Supplemental License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the .
IR 05000352/20230022023-08-14014 August 2023
Integrated Inspection Report 05000352/2023002 and 05000353/2023002
ML23220A0182023-08-0808 August 2023
Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection 05000352/2023401 and 05000353/2023401
RS-23-087, Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor2023-08-0404 August 2023
Revision to Approved Alternatives Associated with the Use of the BWRVIP Guidelines in Lieu of Specific ASME Code Requirements on Reactor
ML23212B2362023-07-31031 July 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System - WEC Documents
ML23212B1052023-07-31031 July 2023
Supplement to License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the Digital Modernization Project Installation - Revise
ML23202A2192023-07-21021 July 2023
Response to Request for Additional Information for Supplemental License Amendment Request to Revise Technical Specifications and Exemption Request from Requirements of 10CFR50.62 ATWS Rule to Support the .
ML23193B0122023-07-20020 July 2023
Audit Plan in Support of Review of License Amendment Request and Exemption Request for Digital Instrumentation and Controls Installation Support (Epids L-2023-LLA-0025 and L-2023-LLE-0005)
ML23187A0962023-07-19019 July 2023
Generation Station, Unit Nos. 1 and 2 - Revised Estimated Review Completion Date Concerning License Amendment Request to Replace Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection System
ML23208A1522023-07-0606 July 2023
PEMA Letter Dated 7-6-23 Re Limerick Exercise 9-26-23
ML23177A2242023-06-26026 June 2023
Supplement to License Amendment Request to Revise the Licensing and Design Basis to Incorporate the Replacement of Existing Safety-Related Analog Control Systems with a Single Digital Plant Protection .
ML23145A1972023-06-23023 June 2023
Correction to the Renewed Facility Operating License Pages in Amendment Nos. 255, 256, 257, 258, 259, and 260
2024-02-02
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Text
200 Exelon Way Kennett Square, PA 19348 www.constellation.com March 25, 2022 U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 ATTN: Document Control Desk Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353
Subject:
Supplement to Review of Limerick Generating Station Defense in Depth and Diversity Common Cause Failure Coping Analysis, WNA-AR-01074-GLIM-P, Rev 1, February 2022
References:
- 1. CEG Slides for Pre-submittal Meeting, Limerick Generating Station Digital Modernization Project LAR Technical Specifications Changes, dated January 11, 2022 (ADAMS Accession No. ML22010A069)
- 2. NRC Standard Review Plan Branch Technical Position 7-19, Guidance for Evaluation of Defense-in-Depth and Diversity to Address Common Cause Failure due to Latent Design Defects in Digital Safety Systems, Revision 8, dated January 2021
- 3. Constellation Energy Generation, LLC letter to the U.S. Nuclear Regulatory Commission, Limerick Generating Station, Units 1 and 2, "
Review of Limerick Generating Station Defense in Depth and Diversity Common Cause Failure Coping Analysis, WNA-AR-01074-GLIM-P, Rev 1, February 2022, dated February 14, 2022 (ADAMS Accession No. ML22046A003)
- 4. Email from Michael Marshall (U.S. Nuclear Regulatory Commission) to Frank Mascitelli (Constellation Energy Generation, LLC), List of Acceptance Issues and Questions re Limerick D3 Analysis (L-2022-LLT-0000), dated March 16, 2022
- 5. Meeting with Constellation Energy Generation, LLC Regarding Defense-in-Depth and Diversity Common Cause Failure Coping Analysis Request for Limerick Generating Station, Units 1 and 2. March 21, 2022 (ADAMS Accession No. ML22076A021)
In Reference 1, during final discussion of next steps in an NRC Pre-submittal Meeting conducted on January 11, 2022, Constellation Energy Generation, LLC (CEG) (previously Exelon Generation Company, LLC) informed the NRC of the intent to submit a Defense in Depth and Diversity (D3) Coping Analysis prior to the submittal of its associated License Amendment Request (LAR) for the Limerick Generating Station, Units 1 and 2 (LGS) Digital
Review of LGS D3 Coping Analysis LGS Digital Modernization Project Docket Nos. 50-352 and 50-353 March 25, 2022 Page 2 Modernization Project. The purpose was to facilitate future pre-submittal discussions and to improve NRC staff technical review time post-LAR submittal.
In Reference 3, Constellation Energy Generation, LLC (CEG) requested approval of the LGS Defense in Depth and Diversity Common Cause Failure Coping Analysis, WNA-AR-01074-GLIM-P, Rev 1, February 2022 Report (D3 Coping Analysis), which was prepared in accordance with Reference 2, by August 14, 2022.
Pursuant to References 4 and 5, NRC requested a meeting to discuss the Acceptance Review of the D3 Coping Analysis.
This letter is a response to References 4 and 5. After reviewing the apparent information insufficiencies and questions that could potentially become requests for additional information presented and discussed in the March 21, 2022 teleconference meeting, CEG withdraws the request to complete the review of the D3 Coping Analysis by August 14, 2022 and hereby modifies the request such that a separate SER and approval will not be necessary. CEG acknowledges that the D3 Coping Analysis is part of the LAR review and NRC can continue to review the D3 Coping Analysis and provide timely feedback to CEG without requiring D3 Coping Analysis approval.
CEG is currently planning to submit the LGS Digital Modernization Project LAR in the late August 2022 timeframe. The LAR will contain the D3 Coping Analysis and will address the identified acceptance review and technical issues identified during the Acceptance Review meeting conducted on March 21, 2022.
There are no regulatory commitments contained in this review request.
If you have any questions regarding this submittal, please contact Frank Mascitelli at 610-765-5512.
I declare under penalty of perjury that the foregoing is true and correct. Executed on this 25th day of March 2022.
Respectfully, David P. Helker Sr. Manager, Licensing Constellation Energy Generation, LLC cc: Regional Administrator - NRC Region I NRC Senior Resident Inspector - Limerick Generating Station NRC Project Manager, NRR - Limerick Generating Station Director, Bureau of Radiation Protection - Pennsylvania Department of Environmental Protection
