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

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.2

==

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.3 USGS Community Internet Intensity Map VIRGINIA Aug23 2011 01:51:04 PM bcal 37.936N 77.933W Ma Depth: 8km ID:se08231 la OIlY SIZE 2Wn~o 3SN-3rN-SWN 38"N arN I -:VE f 7"W 78W nWw 76W If~a 1 r11 jHuw J vij Not felý W.S I 1 Mcdrais Sr mg Vey simnuI severe I 1 IMownate ModssHIL4 He .H Rvoedac tw Aug2 f 4 USGS Community Internet Intensity Map VIRGINIA Aug 23 2011 01:51:04 PM local 37.936N 77.933W M5.8 Depth: 6 krn ID:se011a CITY SIZE-cmKLOO 45'N 40'N -4.TN 40*N 3WN 85OW 80~W 7WW -70W I 'om'f I IM IV Sevi VI~fI Exvn ONVAGG fr*W rxxe nore ifwy Wgn LotN Modem*t McdmauJu~v~y IHw.VY I v Helwi Pfocessed Thu Aug 25 18-12:04 2011 5