ML19176A281
| ML19176A281 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 06/07/2019 |
| From: | Sayoc E NRC/NRR/DMLR/MRPB |
| To: | Aitken P, Blocher E Dominion Energy Co |
| Sayoc E | |
| References | |
| Download: ML19176A281 (2) | |
Text
From:
Sayoc, Emmanuel To:
Paul Aitken; "Eric A Blocher" Cc:
Wu, Angela
Subject:
Draft RAI 4.7.3-7 Surry SLR 4.7.3 LBB TLAA Date:
Friday, June 07, 2019 10:51:43 PM Attachments:
RAI 4.7.3-7 Surry SLR 4.7.3 LBB TLAA.docx Paul, Eric, draft RAI attached.
Clarification call soon.
Thanks Manny
RAI 4.7.3-7 Regulatory Basis In accordance with 10 CFR 54.21(c)(1), the applicant shall provide a list of time-limited aging analyses (TLAAs), as defined in 10 CFR 54.3. The applicant shall demonstrate that: (i) the analyses remain valid for the period of extended operation; (ii) the analyses have been projected to the end of the period of extended operation; or (iii) the effects of aging on the intended function(s) will be adequately managed for the period of extended operation.
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Background===
SLRA Section 4.7.3 addresses a TLAA on leak-before break (LBB) for the reactor coolant system (RCS) primary loop. Dominion (applicant) indicated that the LBB analysis for 80 years of operation is documented in WCAP-15550, Revision 2. WCAP-15550, Revision 2 identifies three elbow locations (locations 3, 6 and 15) as critical locations in the LBB analysis.
Issue WCAP-15550, Revision 0 (August 2000) is the basis document for the 60-year LBB analysis of the Surry plant, as indicated in Section IV.1.B.vii.2 of the Surry power uprate application dated January 27, 2010. WCAP-15550, Revision 0 indicates that location 4 is one of the critical elbow locations for the 60-year LBB analysis. In contrast, WCAP-15550, Revision 2 indicates that location 3 is one of the critical elbow locations instead of location 4.
Request Provide the basis for the change to the critical elbow location from location 4 (WCAP-15550, Revision 0) to location 3 (WCAP-15550, Revision 2) to confirm that location 3 is the highest stressed elbow location for the hot leg.