ML22024A030

Breakout Questions - Trp 42 - ASME XI, Subsection Iwl

ML22024A030
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Site:	Oconee
Issue date:	01/20/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
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ONS SLRA: Breakout Questions SLRA Section B2.1.29 - ASME XI, Subsection IWL AMP TRP: 042 Question Number SLRA Section SLRA Page Background / Issue (As applicable/needed)

Discussion Question / Request 1

B2.1.29 N/A AR 01817471 on CERTREC discusses a lack of adequate records for IWL exams on Unit 2.

How has this issue been addressed to ensure proper records are taken moving forward? Can you point to inspection procedures that clearly identify what needs to be recorded during each inspection?

2 B2.1.29 OE #2 B-205 SLRA OE #2 and associated AR01828181 discusses cracking on the Unit 1 dome and the possible installation of a protective coating system.

Was the coating system installed?

Has similar cracking been seen on Units 2 or 3 and if so were similar corrective actions taken?

Please provide ARs or WOs on the portal documenting the resolution (i.e., WO showing the installation of the coating system, follow-up inspections, etc.)

3 B2.1.29 OE #3 B-205 SLRA OE#3 discusses high concrete temperatures around the Unit 1 main steam penetration.

Were Units 2 and 3 checked for similar high temperature issues? If so what was the resolution, if not why not?

4 B2.1.29 N/A AR01830970 discusses spalling around tendon bearing plates.

If available, please load pictures of this issue on to Certrec for staff review.

5 B2.1.29 N/A AR02081433 discusses indications found during tendon inspections.

Please provide documentation on Certrec showing the

resolution of these issues.

Include photos if available.

6 N/A N/A NRC Information Notice (IN) 99-10 notes that during a 1998 walkdown NRC staff observed tendon grease leakage from hoop tendons on all three containments.

During the recent SLR walkdowns, NRC staff once again identified grease stains on the containment structures.

Explain if the grease leakage is an ongoing issue or if the stains seen during recent walkdowns are inactive and indications from past leakage.

If the leakage is active please explain how it is being age-managed.

7 3.5.2.2.1.7 3-1211 SRP-SLR guidance says a plant-specific program is not necessary if the concrete was constructed with air content of 3 to 8 percent.

Provide documentation on the portal demonstrating the air content of the containment structures.

8 4.5, B3.4 and B2.1.29 B-204 Section 4.5 of SLR-ONS-AMPR-X.S1 (Containment Tendon AMP Basis Doc) states, the calculations for tendon prestressing losses and predicted tendon forces are consistent with NRC RG 1.35.1.

However, SLRA Section B2.1.29 (ASME Section XI, Subsection IWL) contains an exception to element 6 which states, the predicted lower limit values consider the same factors, but are not in complete accordance with RG 1.35.1 for determining predicted lower limit values.

Please explain this apparent discrepancy and elaborate on the justification for the exception in SLRA Section B2.1.29.