NL-20-0630, 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019

10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019

ML20176A577
Person / Time
Site:	Hatch, Vogtle, Farley
Issue date:	06/19/2020
From:	Gayheart C Southern Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-20-0630
Download: ML20176A577 (6)

Text

Cheryl A. Gayheart 3535 Colonnade Parkway Regulatory Affairs Director Birmingham, AL 35243 205 992 5316 tel 205 992 7795 fax cagayhea@southernco.com June 19, 2020 Docket Nos.: 50-321 50-348 50-424 NL-20-0630 50-366 50-364 50-425 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant Units 1 and 2 Joseph M. Farley Nuclear Plant Units 1 and 2 Vogtle Electric Generating Plant Units 1 and 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 Ladies and Gentlemen:

Southern Nuclear Operating Company (SNC) is the licensed operator for the Edwin I. Hatch Nuclear Plant (HNP) Units 1 & 2, the Joseph M. Farley Nuclear Plant (FNP) Units 1 and 2, and the Vogtle Electric Generating Plant (VEGP), Units 1 and 2. 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 HNP Unit 2 and FNP Unit 1 are provided in Enclosures 1 and 2, respectively.

There were no changes or errors to report for 2019 for the HNP Unit 1, FNP Unit 2, and VEGP Units 1 and 2 ECCS models; 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 and 2 continue to meet the criterion of 10 CFR 50.46(b)(1) (i.e., 2200°F).

This letter contains no NRC commitments. If you have any questions, please contact Jamie Coleman at 205.992.6611.

Respectfully submitted, Cheryl A. Gayheart Regulatory Affairs Director CAG/TLE/scm

U. S. Nuclear Regulatory Commission NL-20-0630 Page 2

Enclosures:

1. Edwin I. Hatch Nuclear Plant Unit 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019

2. Joseph M. Farley Nuclear Plant Unit 1 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 cc: Regional Administrator, Region ll NRR Project Manager - HNP, FNP, VEGP 1 & 2 Senior Resident Inspector - HNP, FNP, VEGP 1 & 2 NRR Project Manager - HNP, FNP, VEGP 1 & 2 RType: CGA02.001

Edwin I. Hatch Nuclear Plant Units 1 and 2 Joseph M. Farley Nuclear Plant Units 1 and 2 Vogtle Electric Generating Plant Units 1 and 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 Enclosure 1 Edwin I. Hatch Nuclear Plant Unit 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 to NL-20-0630 Edwin I. Hatch Nuclear Plant Unit 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 Edwin I. Hatch Nuclear Plant Unit 2 Table 1-1a - TRACG-LOCA Summary of Changes / Errors (2019) (GNF2, GNF3, GNF3 LUAs)

Estimated Description Effect

( PCT, °F)

Incorrect Radiation Heat Transfer Coefficient. +35 Table 1-1b - Cumulative Impact of Changes / Errors GNF3 GNF2 GNF3 (LUAs)

Description lPCTl lPCTl lPCTl

(°F) (°F)

(°F)

Changes/Errors Previously Reported (See Note) 0 0 0 Summary of Changes/Errors (2019) (Reference 1) 35 35 35 Cumulative Total 35 35 35 Note: Unit 2 Cycle 26, which started in early 2019, is the first use of TRACG-LOCA methodology for Hatch. The base PCT for TRACG-LOCA is documented in Reference 2.

For Unit 2 Cycle 25, there were no changes to report for 2019 in regard to the previous SAFER methodology reported in Reference 3.

References:

1. GE Hitachi 10 CFR 50.46 Notification Letter 2019-02, dated March 21, 2019

2. Global Nuclear Fuel 004N5055, Supplemental Reload Licensing Report for Hatch 2 Reload 25 Cycle 26, Revision 0, dated November 2018

3. Letter from Cheryl A. Gayheart to USNRC (NL-19-0650), ML19156A245, Edwin I. Hatch Nuclear Plant Units 1 and 2, Joseph M. Farley Nuclear Plant Units 1 and 2, Vogtle Electric Generating Plant Units 1 and 2, 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2018, dated June 5, 2019 E1-1

Edwin I. Hatch Nuclear Plant Units 1 and 2 Joseph M. Farley Nuclear Plant Units 1 and 2 Vogtle Electric Generating Plant Units 1 and 2 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 Enclosure 2 Joseph M. Farley Nuclear Plant Unit 1 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 to NL-20-0630 Joseph M. Farley Nuclear Plant Unit 1 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2019 Joseph M. Farley Nuclear Plant - Unit 1 ASTRUM Best Estimate Large Break LOCA Evaluation Table 1-1a - Summary of Changes/Errors (2019)

Estimated Description Effect

( PCT °F)

PBOT/PMID Violation. 0 Table 1-1b - Cumulative Impact of Changes/Errors lPCTl Description

(°F)

Changes/Errors Previously Reported (Reference 1) 0 Summary of Changes/Errors (2019) (Reference 2) 0 Cumulative Total 0

References:

1. Letter from Cheryl A. Gayheart to USNRC (NL-19-0650), ML19156A245, Edwin I. Hatch Nuclear Plant Units 1 and 2, Joseph M. Farley Nuclear Plant Units 1 and 2, Vogtle Electric Generating Plant Units 1 and 2, 10 CFR 50.46 ECCS Evaluation Model Annual Report for 2018, dated June 5, 2019

2. Westinghouse Letter LTR-LIS-20-12, J. M. Farley Units 1 and 2, 10 CFR 50.46 Annual Notification and Reporting for 2019, dated February 11, 2020 E2-1