ML12044A378
| ML12044A378 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/06/2011 |
| From: | Jerome Bettle Office of Nuclear Reactor Regulation |
| To: | Dennig R Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2011-0357 | |
| Download: ML12044A378 (1) | |
Text
Bettle, Jerome From:
Bettle, Jerome f Sent:
Tuesday, September 06, 2011 4:59 PM To:
Dennig, Robert
Subject:
RE: North Anna From the online news: http://newsfeedresearcher.com/data/articles b36/plants-nuclear-earthquake.html Dominion said the North Anna reactors, which entered service in 1978 and 198o, were designed for an earthquake of up to 6.2 magnitude, but the NRC does not use that scale to measure seismic design specifications. [121 Dominion told The Hill last week that the North Anna reactors were designed to withstand the equivalent of a 5.9 to 6.1 magnitude earthquake. 1141 In the release, the NRC said the investigation will "determine the precise level of shaking that was experienced at key locations within the North Anna facility." The NRC requires that the plant not re-start "until it can demonstrate that no functional damage occurred to those features needed for continued safe operation." 1,71 Ongoing inspections of the North Anna plant have yet to reveal any major damage, Norvelle said. Inspectors have found thermal insulation shaken off pipes, relays on transformers that need to be replaced and minor cracking in office buildings, he said. 171 The North Anna plant is located about 12 miles from the epicenter of the earthquake that struck northwest of Richmond, Va., last Tuesday. [131 The ground motion at the site of the two nuclear plants is consistent with an earthquake 4-5 times more powerful than the 5.8-magnitude that scientists recorded. That's most likely because the earthquake was centered relatively close to the surface.
From: Dennig, Robert l
Sent: Tuesday, September 06, 2011 9:11 AM To: Bettle, Jerome; Lee, Brian
Subject:
North Anna Should we require any Appendix J testing to demonstrate containment integrity prior to restart?
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