ML12044A257

Email from A. Istar, NRR to A. Hiser, NRR on North Anna Nuclear Power Plant. Pptx

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

Patti Craver, 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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