ML12005A012

E-mail from R2 IRC to Pn Distribution

ML12005A012
Person / Time
Site:	North Anna
Issue date:	08/23/2011
From:	NRC/RGN-II
To:
References
FOIA/PA-2011-0357
Download: ML12005A012 (2)

Text

Boin Sunn Bozin, Sunny From: Sent: To:

Subject:

Attachments:

See attached.R2 IRC Tuesday, August 23, 2011 7:16 PM PN Distribution PNO-II-11-005 (North Anna)North AnnaPNO-II-11-005.docx Y)1 August 23, 2011 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE

-PNO-I1-11-005 This preliminary notification constitutes EARLY notice of events of possible safety or public interest significance.

The information is as initially received without verification or evaluation, and is basically all that is known by Region II staff (Atlanta, Georgia) on this date.Facilities:

Virginia Electric and Power Company North Anna Power Station, Units 1 and 2 Mineral, Virginia Docket/License:

50-338/NPF-4, 50-339/NPF-7 Calvert Cliffs Nuclear Power Plant DC Cook Hope Creek Generating Station Limerick Generating Station Oyster Creek Nuclear Generating Station Palisades Peach Bottom Atomic Power Station Salem Nuclear Generating Station Shearon Harris Nuclear Plant Surry Power Station, Units 1 and 2 Susquehanna Power Station Three Mile Island Nuclear Station Licensee Emergency Classifications:

D] Notification of Unusual Event Z Alert[: Site Area Emergency El General Emergency EL Not Applicable Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event Notification of Unusual Event

SUBJECT:

EMERGENCY DECLARATIONS DUE TO SEISMIC EVENT At 2:22 p.m. (EDT) on August 23, 2011, NRC entered the Monitoring Mode following the declaration of an ALERT at the North Anna Power Station Units 1 and 2, located in Virginia, at 2:03 p.m. The emergency was declared following a seismic event near the North Anna station. Both North Anna units experienced reactor trips and a loss of all offsite alternating cu'rrent (AC) power (LOOP) to the emergency buses. The cause of the reactor trips and LOOP are being investigated.

The on-site emergency diesel generators (EDGs) initially started and powered the station emergency buses. Subsequently, one of the EDGs was shutdown due to a diesel coolant leak. Another diesel generator was started and all emergency buses continue to be powered.Additionally, a number of plants declared a Notice of Unusual Event (NOUE) due to seismic activity at the site.Plants declaring NOUEs, which indicate a potential decrease in plant safety, include Peach Bottom, Three Mile Island, Susquehanna and Limerick in Pennsylvania; Salem, Hope Creek and Oyster Creek in New Jersey, Calvert Cliffs in Maryland, Surry in Virginia, Shearon Harris in North Carolina and D.C. Cook and Palisades in Michigan.

All these plants continue to operate while plant personnel examine their sites.The NRC is closely monitoring these activities, including direct on-site observation.

The information presented herein has been discussed with the licensee and is current as of 7:00 p.m.This preliminary notification is issued for information only.All affected States have been notified by the NRC.CONTACT: Joel Munday 404-997-4600 Glenn Dentel 610-337-5233