NL-23-0542, CFR 50.46 ECCS Evaluation Model Annual Report for 2022

CFR 50.46 ECCS Evaluation Model Annual Report for 2022

ML23221A202
Person / Time
Site:	Hatch, Vogtle, Farley
Issue date:	08/09/2023
From:	Brown R Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
NL-23-0542
Download: ML23221A202 (1)

Text

Southern Nuclear

>- Southern Nuclear Operating Company, Inc.

3535 Colonnade Parkway Birmingham, AL 35243 August 9, 2023 Docket No. : 50-321 50-348 50-424 52-025 NL-23-0542 50-366 50-364 50-425 52-026 10 CFR 50.46(a)(3)(ii)

U.S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Edwin I. Hatch Nuclear Plant Units 1 and 2 Joseph M. Farley Nuclear Plant Units 1 and 2 Vogtle Electric Generating Plant Units 1, 2, 3 and 4 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2022 Ladies and Gentlemen:

Southern Nuclear Operating Company (SNC) is the licensed operator for the Edwin I. Hatch Nuclear Plant (HNP) Units 1 and 2, the Joseph M. Farley Nuclear Plant (FNP) Units 1 and 2, and the Vogtle Electric Generating Plant (VEGP) Units 1, 2, 3 and 4. The requirements of 10 CFR 50.46(a)(3)(ii) include an annual report by licensees of changes to, or errors in, acceptable emergency core cooling system (ECCS) models that affect the temperature calculation and the estimated effect of changes or errors on the limiting ECCS analysis.

Accordingly, the reports required by 10 CFR 50.46(a)(3)(ii) for FNP Units 1 and 2 and VEGP Units 3 and 4 are provided.

For FNP Units 1 & 2, Westinghouse Letter LTR-NRC-23-5 (ADAMS Accession Number ML23072A071) documents an error to the ASTRUM (2004), Best Estimate Large Break, model that had a 0°F effect on PCT and was determined to be applicable to the plant-specific model.

There were no changes or errors to the NOTRUMP, Appendix K Small Break, model.

For VEGP Units 3 & 4, Westinghouse Letter DCP_NRC_003347 (ADAMS Accession Number ML23090A166) documents an error to the ASTRUM (2004), Best Estimate Large Break, model that had a 0°F effect on PCT and was determined to be applicable to the plant-specific model.

There were no changes or errors to the NOTRUMP-AP, Appendix K Small Break, model.

For calendar year 2022, there were no changes or errors to report for HNP Units 1 and 2 and VEGP Units 1 and 2 ECCS models that affected the temperature calculation ; thus, no reports are required for those units.

The resulting peak cladding temperatures (PCT) for HNP Units 1 and 2, FNP Units 1 and 2, and VEGP Units 1, 2, 3, and 4 continue to meet the criterion of 10 CFR 50.46(b)(1) (i.e., s 2200°F).

This letter makes no regulatory commitments. This letter has been reviewed and determined not to contain security-related information.

If you have questions, please contact Amy Chamberlain at 205-992-6361 .

U.S. Nuclear Regulatory Commission NL-23-0542 Page 2 of 2 Respectfully submitted, R. Keith Brown Regulatory Affairs Director Southern Nuclear Operating Company cc: Regional Administrator, Region II NRR Project Manager-HNP, FNP, VEGP 1&2 VPO Project Manager Senior Resident Inspector- HNP, FNP, VEGP 1&2, VEGP 3&4 Document Services RTYPE: CGA02.001, VND.LI.L00 File AR.01.02.06