ML22024A055

Breakout Questions - Trps 62 and 145 - Tendon Prestress

ML22024A055
Person / Time
Site:	Oconee
Issue date:	01/20/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
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Text

ONS SLRA: Breakout Questions SLRA Section B3.4 - Concrete Containment Unbonded Tendon Prestress AMP & TLAA TRP: 062 and 145 Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed) 1 4.5, B3.4 B-204 Section 4.5 of SLR-ONS-AMPR-X.S1 Please explain this apparent and (Containment Tendon AMP Basis Doc) discrepancy and elaborate on B2.1.29 states, the calculations for tendon the justification for the prestressing losses and predicted tendon exception in SLRA Section forces are consistent with NRC RG B2.1.29.

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.

2 4.5, 4 - 90 SLRA Section B3.4 states that What, if any, corrective actions Figure and B acceptance criteria consist of predicted were taken to address the 4.5-8, and - 299 values on the forces in individual tendons lower than predicted values?

B3.4 SLRA Figure 4.5-8 has two points below the predicted lower limit (PLL) with one of those points close to the MRV.

3 4.5 and B- SLRA Section B3.4 includes exceptions to Please explain why it is B3.4 301 elements 3 and 5 based on initial lift-off acceptable to develop the pre-data not being available for trending. stressing force trend lines without the data from the initial tendon surveillance program.