ML24003A902
| ML24003A902 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 01/03/2024 |
| From: | James Holloway Virginia Electric & Power Co (VEPCO) |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 23-402 | |
| Download: ML24003A902 (1) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 January 3, 2024 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATIONS UNITS 1 AND 2 Serial No.:
23-402 NRA/GDM:
RO Docket Nos.:
50-280 50-281 License Nos.: DPR-32 DPR-37 EMERGENCY PLAN REVISION - RELOCATION OF THE TECHNICAL SUPPORT CENTER (TSC) - EDITORIAL CORRECTION By letter dated November 18, 2022 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML22322A182), as supplemented by letters dated May 31 (ML231678007) and August 7, 2023 (ML23220A148), Virginia Electric and Power Company (Dominion Energy Virginia) submitted a license amendment request (LAR) to revise the Surry Power Station (SPS) Units 1 and 2 Emergency Plan. The LAR addressed the relocation of the Technical Support Center (TSC) from its current location adjacent to the Main Control Room (MCR) to the building located outside the Protected Area (PA) previously used as the site Local Emergency Operations Facility (LEOF). The NRC approved the TSC relocation in its safety evaluation (SE) for SPS Units 1 and 2 License Amendments 315 and 315, respectively, included in its November 7, 2023 letter (ML23242A229).
Dominion Energy Virginia has reviewed the SE and noted a discrepancy in the NRC table, "Summary of TSC Dose Results," included in Section 3.6.2.4 on page 20 of the SE.
Specifically, the table indicates the total current license basis (CLB) alternative source term (AST) TSC dose is 1.442 rem Total Effective Dose Equivalent (TEDE). The actual CLB AST TSC dose value is 1.3 rem TEDE. (The exact total is 1.253 rem TEDE, which was conservatively rounded up to 1.3 rem TEDE.) The NRC total is based on correctly adding the table entries that were included in Table 4-1 of Dominion Energy Virginia's letter dated May 31, 2023, which provided a summary of the Loss of Coolant Accident (LOCA) dose calculation that was completed to confirm the projected dose to personnel in the proposed TSC from a design LOCA with a release to the environment would be less than the dose limit of five (5) rem TEDE. The difference resulted from a typographical error in the RWST Leakage dose value included in Table 4-1. The AST TSC RWST Leakage dose should have been 0.0210 rem TEDE instead of the 0.2100 value included in Table 4-1 of our May 31, 2023 letter.
Serial No.: 23-402 Docket Nos.: 50-280/281 Page 2 of 4 The updated Table 4-1 with the correct, highlighted, RWST leakage value is provided below. With the corrected value, the CLB AST TSC dose accurately reflects the 1.3 rem TEDE value included in Table 4-1 of our May 31, 2023 letter.
Corrected Table 4-1: Summary of TSC Dose Results TSC Dose rrem TEDEl LOCA Dose Component TSC Relocation SI-based 60-min ASTTSC Isolation Isolation Containment Leakage 0.0700 0.5866 0.1350 ECCS Leakage 0.2055 0.2691 0.1110 RWST Leakage 0.0162 0.0173 0.0210 Containment Direct Shine 0.0050 0.0050 0.0470 Containment Skyshine 1.6028 1.6028 0.3810 Cloudshine1 0.0361 0.0361 0.1950 Filter Shine 0.1000 0.1000 0.1600 Containment Shine through Main Steam Line Penetrations
--2 0.0050 SI Piping under Main Steam Valve House & QS Pump House 0.1940 Hydrogen Re-combiner Vault 0.0040 Total 2.04 2.62 1.30 1 Cloudshine was reported individually for each of the three release cases. The individual values are summed here for comparison to the cloudshine/plume calculation.
2 Sources indicated with a result of"--" were deemed negligible with respect to the new TSC location due to source/receptor geometry.
Also, the NRC SE introduced a typographical error into the reproduction of the dose results table in that the word Skyshine was incorrectly spelled as Skvshine. This term is spelled correctly in the above table with highlighting added for emphasis.
Finally, one additional SE discrepancy was noted during our review. On page 18, Section 3.6.2.2, "Infiltration of Airborne Radioactivity," the following sentence reads:
The volume change stated above by the licensee, per SRP 6.4, allows for the least restrictive frequency for periodic verification.
The sentence should read:
The volume change rate stated above by the licensee, per SRP 6.4, allows for the least restrictive frequency for periodic verification.
It should be noted these editorial discrepancies have no impact on the conclusions of the SE.
Serial No.: 23-402 Docket Nos.: 50-280/281 Page 3 of 4 Should you have any questions or require additional information, please contact Mr. Gary D. Miller at (804) 273-2771.
Respectfully,
~
James E. Holloway Vice President - Nuclear Engineering and Fleet Support Commitments contained in this letter: None.
COMMONWEAL TH OF VIRGINIA )
)
COUNTY OF HENRICO
)
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by James E. Holloway, who is Vice President - Nuclear Engineering and Fleet Support, of Virginia Electric and Power Company. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 3~J day of.=s::;,,_.r:i (:J, 2024.
My Commission Expires: 0t1' llA.f-3 \\,1 'Z-o'2c7.
GARY DON MILLER Notary Public Commonwealth of Virginia Reg.# 7629412
,_ My Commission Expires August 31, 2oa1
cc:
U.S. Nuclear Regulatory Commission - Region II Attn: Regional Administrator Marquis One Tower 245 Peachtree Center Avenue, NE., Suite 1200 Atlanta, Georgia 30303-1257 Mr. L. John Klos NRC Project Manager - Surry Power Station U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 09 E-3 11555 Rockville Pike Rockville, Maryland 20852-2738 Mr. G. Edward Miller NRC Senior Project Manager - North Anna Power Station U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 09 E-3 11555 Rockville Pike Rockville, Maryland 20852-2738 NRG Senior Resident Inspector Surry Power Station State Health Commissioner Virginia Department of Health James Madison Building - 7th floor 109 Governor Street, Suite 730 Richmond, Virginia 23219 Serial No.: 23-402 Docket Nos.: 50-280/281 Page 4 of 4