ML22220A130

Exemptions from the Requirements of 10 CFR 50.46 and 10 CFR Part 50 Appendix a, General Design Criteria 35, 38, and 41 (EPID L-2021-LLE-0021) (Cover Letter)

ML22220A130
Person / Time
Site:	Callaway
Issue date:	10/21/2022
From:	Mahesh Chawla Plant Licensing Branch IV
To:	Diya F Ameren Missouri
Lingam S
Shared Package
ML22220162	List: ML22220A130 ML22220A131
References
EPID L-2021-LLE-0021
Download: ML22220A130 (4)

Text

October 21, 2022

Mr. Fadi Diya Senior Vice President and Chief Nuclear Officer Ameren Missouri Callaway Energy Center 8315 County Road 459 Steedman, MO 65077

SUBJECT:

CALLAWAY PLANT, UNIT NO. 1 - EXEMPTIONS FROM THE REQUIREMENTS OF 10 CFR 50.46 AND 10 CFR PART 50, APPENDIX A, GENERAL DESIGN CRITERIA 35, 38, AND 41 (EPID L-2021-LLE-0021)

Dear Mr. Diya:

The U.S. Nuclear Regulatory Commission (NRC) has approved the enclos ed exemptions from specific requirements of Title 10 of the Code of Federal Regulations (10 CFR) Section 50.46, Acceptance criteria for emergency core cooling systems for light-water nuclear power reactors, and 10 CFR Part 50, Appendix A, General Design Criteria for Nuclear Power Plants, General Design Criterion (GDC) 35, Emergency core cooling; GDC 38, Containment heat removal; and GDC 41, Containment atmosphere cleanup, for Callaway Plant, Unit No. 1. This action is in response to your application dated March 31, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21090A184), as supplemented by letters dated May 27, 2021, July 22, 2021, August 23, 2021, October 7, 2021, January 27, 2022, March 8, 2022, May 26, 2022, and September 8, 2022 (ML21147A222, ML21203A192, ML21237A135, ML21280A378, ML22027A804, ML22068A027, ML22146A337, and ML22251A343, respectively). Union Electric Company, dba Ameren Missouri (the licensee),

requested exemptions pursuant to 10 CFR 50.12, Specific exemptions, to allow use of a risk-informed methodology instead of the traditional deterministic methodology; to resolve the concerns associated with Generic Safety Issu e (GSI)-191, Assessment of Debris Accumulation on PWR [Pressurized Water Reactor] Sump Performance; and respond to Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized Water Reactors, dated September 13, 2004 (ML042360586).

As part of the actions to resolve concer ns associated with GSI-191, the NRC issued GL 2004-02 to holders of operating licenses for PWRs. In GL 2004-02, the NRC staff requested that licensees perform an evaluation of t heir emergency core cooling system (ECCS) and containment spray system (CSS) recirculat ion functions considering the potential for debris-laden coolant to be circulated by the ECCS and the CSS after a loss-of-coolant accident or high energy line break inside containment and, if appropriate, take additional actions to ensure system function. GL 2004-02 required that licensees provide a written response to the NRC, pursuant to 10 CFR 50.54(f), describing the results of their evaluation and any modifications made, or planned, to ensure the ECCS and CSS remain functional.

F. Diya

The exemptions are being forwarded for publication to the Office of the Federal Register.

If you have any questions, please contact me at 301-415-8371 or via e-mail at Mahesh.Chawla@nrc.gov.

Sincerely,

/RA Siva Lingam for/

Mahesh L. Chawla, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

Docket No. 50-483

Enclosure:

Exemptions

cc: Listserv

ENCLOSURE

EXEMPTIONS FROM THE REQUIREMENTS OF 10 CFR 50.46 AND

10 CFR PART 50, APPENDIX A, GENERAL DESIGN CRITERIA 35, 38 AND 41

ASSOCIATED WITH GSI-191 AND GL 2004-02

UNION ELECTRIC COMPANY DBA AMEREN MISSOURI

CALLAWAY PLANT, UNIT NO. 1

DOCKET NO. 50-483

LETTER: ML22220A130 EXEMPTIONS: ML22220A131 FRN: ML22220A129 (not included) *by email OFFICE NRR/DORL/LPL4/PM* NRR/DORL/LPL4/LA* NRR/DSS/STSB/BC*

NAME MChawla (SLingam for) PBlechman VCusumano DATE 8/1/2022 8/10/2022 8/15/2022 OFFICE NRR/DRA/APLB/BC* OGC (NLO)* NRR/DORL/LPL4/BC*

NAME JWhitman LShrum JDixon-Herrity DATE 8/11/2022 9/8/2022 10/12/2022 OFFICE NRR/DORL/LPL4/PM*

NAME MChawla (SLingam for)

DATE 10/21/2022