ML22013A307

Trp 084 St Lucie SLRA - Ssnial Scclombreakoutq

ML22013A307
Person / Time
Site:	Saint Lucie
Issue date:	01/11/2022
From:	Office of Nuclear Reactor Regulation
To:
Rodriguez-Luccioni H
References
EPID L-2021-SLR-0002, L-2021-SLR-0002
Download: ML22013A307 (2)

Text

St. Lucie Nuclear Plant, Units 1 and 2, Subsequent License Renewal Application (SLRA)

Breakout Audit Questions Technical Reviewer Gregory Makar 1/ 10 /2022 Technical Branch Chief Steven Bloom 1/ 10 /2022 TRP 084: Stress Corrosion Cracking and Loss of Material (pitting, crevice) for Stainless Steel, Nickel Alloys, and Aluminum SLRA Section SLRA Page Background/Issue Discussion Question/Request Outcome of Discussion 1

3.3 Table 3.3-1 3.3-69 SLRA Table 3.3-1 omits Item 3.3-1, 233, addressing cracking due to stress corrosion cracking for insulated aluminum piping, piping components, and tanks in air or condensation, in auxiliary systems. Item 3.3-1, 233 requires further evaluation according to SLR-SRP Section 3.3.2.2.8.

Please discuss the omission of Item 3.3-1, 233 from SLRA Table 3.3-1 and discuss the evaluation for Item 3.3-1, 233, required by SLR-SRP Section 3.3.2.2.8.

2 3.4 Table 3.3-1 Table 3.4.2-3 3.4-28 3.4-72 In SLRA Table 3.4-1, the discussion for Item 3.4-1, 074, states there are no stainless steel underground components in the Steam and Power Conversion Systems. However, Chapter 10 of the UFSARs for St. Lucie Units 1 and 2 includes underground stainless steel piping. For Unit 1 (ML20141L657), the piping is listed in Table 10.1-1, page 10.1-10, as Suction (under ground) piping. For Unit 2 (ML20268A132), the piping is listed in Table 10.4-1, page T10.4-10, as Suction (underground auxiliary feedwater piping.

SLRA Table 3.4.2-3, for Auxiliary Feedwater and Condensate, includes stainless steel piping in contact with soil, aligned to Table 1 Items 3.4-1, 072 and 3.4-1, 047, respectively, for cracking and loss of material. Based on the environment of soil, this appears to Please clarify whether there are underground stainless steel piping or piping components in the Steam and Power Conversion Systems at St. Lucie Units 1 and 2.

SLRA Section SLRA Page Background/Issue Discussion Question/Request Outcome of Discussion address piping that is buried according to the SLR-GALL definitions. Table 3.4.2-3 does not identify whether this piping is associated with Unit 1, Unit 2, or both units.

The information described above about piping in the SLRA and the UFSAR makes it unclear whether there are underground stainless steel piping or piping components, as defined by SLR-GALL Table IX.D, Use of Terms for Environments, in the Steam and Power Conversion Systems.