ML22115A004

Response to C-10 Letter Refueling Cavity Water Seal

ML22115A004
Person / Time
Site:	Seabrook
Issue date:	05/04/2022
From:	Justin Poole Plant Licensing Branch 1
To:	Skibbee P NextEra Energy Seabrook
Poole J, NRR/DORL/LPLI, 415-2048
References
Download: ML22115A004 (3)

Text

May 4, 2022 Ms. Patricia L. Skibbee Board President C-10 Research and Education Foundation 11 Chestnut Street Amesbury, MA 01913

SUBJECT:

RESPONSE TO C-10 LETTER RE: REFUELING CAVITY WATER SEAL

Dear Ms. Skibbee:

On behalf of the U.S. Nuclear Regulatory Commission (NRC), I am responding to your letter regarding C-10s review of the most recent NRC Integrated Inspection Report dated February 10, 2022 (Agencywide Documents Access and Management System (ADAMS)

No. ML22040A204), at Seabrook Station, Unit No. 1 (Seabrook). Specifically, in your letter, you requested that the NRC verify that NextEra Energy Seabrook, LLCs (NextEra) evaluation of alkali-silica reaction (ASR) degradation in the reactor cavity pit area considers all potentially affected structures and explicitly addresses the potential impact on the refueling water cavity seal.

The NRC identified Green finding discussed in the fourth quarter NRC Integrated Inspection report refers to the reactor cavity pit area of the Containment Internal Structure (located approximately between elevations -54ft and -34ft) and is distinct from the reactor refueling cavity area of the Containment Internal Structure (located approximately between elevations 0ft and

+27ft). However, as noted in the NRC fourth quarter inspection report, the licensee and its engineering contractor are in the process of performing a full Stage 2 ASR building deformation finite element analysis of the entire containment internal structure in accordance with the structures monitoring program, which includes both the reactor cavity pit area and the reactor refueling cavity. NRC inspectors will be reviewing the results of this analysis when complete. Additionally, NRC inspectors perform daily reviews of licensee corrective action documents and perform walkdowns in containment during refueling outages, including areas in the vicinity of the reactor refueling cavity seal.

P. Skibbee If you have questions or need more information, please contact the me at 301-415-2048, or via email at Justin.Poole@nrc.gov.

Sincerely,

/RA/

Justin C. Poole, Project Manager Plant Licensing Branch I Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-443 cc: Listserv

ML22115A004 OFFICE NRR/DORL/LPL1/PM NRR/DORL/LPL1/LA R1/DORS/BC NRR/DORL/LPL1/BC NRR/DORL/LPL1/PM NAME JPoole KZeleznock MYoung JDanna JPoole DATE 05/02/2022 04/25/2022 04/11/2022 05/04/2022 05/04/2022