ML25084A197
| ML25084A197 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/26/2025 |
| From: | Hammock J Office of Nuclear Reactor Regulation |
| To: | Tennessee Valley Authority |
| References | |
| Download: ML25084A197 (1) | |
Text
1 REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION BROWNS FERRY SLRA SAFETY REVIEW TENNESSEE VALLEY AUTHORITY BROWNS FERRY, UNITS 1, 2, 3 DOCKET NO. 05000259, 05000260, 05000296 ISSUE DATE: 03/25/2025 Regulatory Basis Title 10 of the Code of Federal Regulations Section 54.21(a)(3) requires the applicant to demonstrate that the effects of aging for structures and components will be adequately managed so that the intended function will be maintained consistent with the current licensing basis (CLB) for the period of extended operation. As described in the SRP-SLR, an applicant may demonstrate compliance with 10CFR54.21(a)(3) by referencing the GALL-SLR Report when evaluation of the matter in the GALL-SLR Report applies to the plant.
RAI-ESEB-B.2.1.33-1
Background:
SLRA Supplement 4 (ML25043A035) on PDF Pages 241 and 248 provides Enhancements 5 and 20 to the Structures Monitoring program, which identified the following four aging effects and mechanisms for steel components:
Cracking due to chemical reaction, weathering, settlement, or corrosion of reinforcement Loss of material due to corrosion, delamination, exfoliation, spalling, popout, or scaling Loss of mechanical function due to corrosion, distortion, dirt or debris accumulation, overload wear Loss of preload due to self-loosening The staff reviewed the GALL-SLR report and finds that the first two bulleted aging effects and mechanisms above are applicable to concrete components (e.g., NUREG-2191 Item VII.G.A-90), not for steel components.
Issue:
Enhancements 5 and 20 to the Structures Monitoring program in SLRA Supplement 4 do not make clear the types of steel components, associated aging effects/mechanisms, and Table 2 AMR items for steel components.
Request:
- 1. Clarify the types of steel components addressed by Enhancements 5 and 20 to the Structures Monitoring program in SLRA Supplement 4.
- 2. Evaluate the applicability of the first two aging effects and mechanisms above for steel components and provide justification as needed.
- 3. Clarify or provide Table 2 AMR items for the identified steel components and associated aging effects/mechanisms.
2 OFFICE NRR/DNRL/NLRP/BC NRR/DNRL/NLRP/PM NRR/DEX/ESEB/BC NAME BRogers JHammock ITseng DATE 03/17/2025 03/17/2025 03/12/2025 ADAMS Accession No.: ML25084A197