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: R2 IRC Sent: Tuesday, August 23, 2011 7:16 PM To: PN Distribution

Subject:

PNO-II-11-005 (North Anna)

Attachments: North AnnaPNO-II-11-005.docx See attached.

1 Y)

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: Licensee Emergency Classifications:

Virginia Electric and Power Company D] Notification of Unusual Event North Anna Power Station, Units 1 and 2 Z Alert Mineral, Virginia [: Site Area Emergency Docket/License: 50-338/NPF-4, 50-339/NPF- 7 El General Emergency EL Not Applicable Calvert Cliffs Nuclear Power Plant Notification of Unusual Event DC Cook Notification of Unusual Event Hope Creek Generating Station Notification of Unusual Event Limerick Generating Station Notification of Unusual Event Oyster Creek Nuclear Generating Station Notification of Unusual Event Palisades Notification of Unusual Event Peach Bottom Atomic Power Station Notification of Unusual Event Salem Nuclear Generating Station Notification of Unusual Event Shearon Harris Nuclear Plant Notification of Unusual Event Surry Power Station, Units 1 and 2 Notification of Unusual Event Susquehanna Power Station Notification of Unusual Event Three Mile Island Nuclear Station 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