ML12044A257
| ML12044A257 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/26/2011 |
| From: | Ata Istar NRC/NRR/DLR/RASB |
| To: | Allen Hiser Division of License Renewal |
| References | |
| FOIA/PA-2011-0357 | |
| Download: ML12044A257 (6) | |
Text
Craver, Patti Craver, Patti From:
Istar, Ata\\{\\
Sent:
Friday, August 26, 2011 10:37 AM To:
Hiser, Allen Cc:
Auluck, Rajender
Subject:
North Anna Nuclear Power Plant.pptx North Anna ear Power Pla Allen: As you requested, attached presentation is the summary for the NANPP earthquake issue:
1
[
North Anna Nuclear Power Plant (NANPP)
Earthquake on August 23, 2011 Ata Istar August 26, 2011 North Anna Nuclear Power Plant.pptx 1
- Peak ground acceleration due to the earthquake on August 23, 2011 is estimated to be 0.20g, which may be updated later.
" Therefore, the ground motion likely exceeded the NANPP SSE response spectra of 0.12g.
" If the NANPP SEE response spectra curves would not envelop the new response spectra curves, reevaluation of all SCs in-scope of LR need to be performed for justification of continued operation using the predicted cross-sectional (mechanical) properties at the end of the license period.
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==
Conclusion:==
The reduced cross-sectional (mechanical) properties coupled with the increased seismic estimates will increase the stress levels exponentially at the critical locations of NANPP SCs.
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