ML12038A133

Email from J. Hughey, NRR to R. Martin NRR Ioeb Clearinghouse Screening Summary for Wednesday, August 24, 2011

ML12038A133
Person / Time
Site:	North Anna
Issue date:	08/25/2011
From:	John Hughey Office of Nuclear Reactor Regulation
To:	Martin R Office of Nuclear Reactor Regulation
References
FOIA/PA-2011-0357
Download: ML12038A133 (4)

Text

, I Hughey, John From: Hughey, John Sent: Thursday, August 25, 2011 9:43 AM To: Martin, Robert

Subject:

RE: lOEB Clearinghouse Screening Summary for Wednesday, August 24, 2011 Thanks, Bob.

John Hughey Peach Bottom Project Manager NRR / Division of Operating Reactor Licensing Phone: 301-415-3204 e-mail: John.Hughey@nrc.gov From: Martin, Robert Sent: Thursday, August 25, 2011 9:42 AM To: Hughey, John

Subject:

FW: IOEB Clearinghouse Screening Summary for Wednesday, August 24, 2011 From: King, Mark Sent: Wednesday, August 24, 2011 2:43 PM

Subject:

IOEB Clearinghouse Screening Summary for Wednesday, August 24, 2011 NN THIS SU/ AARY IS FICIAL US NLY Y CO Al SENSI IVEI PROPR =T RY OR R INTER L SE 0 LY NFORM I N***

/DON T FO AR ANY ORTI NS TS DE OF RC ITH T FI BTAI ING RMI SI FRC 0 GINAT Issues for Resolution (IFR): None OpE Forum Postings (COMMS): One (1)

1) Post OpE COMM on EN 47181 - NORTH ANNA I & 2 - ALERT DECLARED DUE TO AN EARTHQUAKE IN THE AREA AND A LOSS OF OFFSITE POWER Post an OpE COMM on this event to the following COMM Groups: All COMMS, AFW, ECCS. Electrical Power Systems, Emergency Diesel Generators, Emergency Preparedness, Flood Protection and Missiles, Inspection Programs, Natural Phenomena, New Reactors, Physical Security, SIT/AlT, Soent Fuel Storage and Handling, and Structural COMM Groups. Assigned to Bob Bernardo.

Management Requests: None Follow-up/Other Tasks: Two (2)

[Note - The information in this part of the Summary is often preliminaryin nature and is provided to help lOEB staff communicate and track noteworthy items being followed up by either the Regions or HQ staff]

I) Earthquake Event: PNO-11-11-005 and EN 47181 - NORTH ANNA I & 2 - ALERT DECLARED DUE TO

,AN EARTHQUAKE INTHE AREA AND A LOSS OF OFFSITE POWER (FOLLOW UP INFORMATION) -

Intorintjon in ths record was deleted in accordace. with the Freedpm of Information /

Act, - ,

-xemt -F FOIA. 2 3 ýý

I North Anna declared an Alert, 12 sites declared NOUEs and 2 Research and Test Reactors declared NOUEs. (See the NOUE EN links in screened out section for more details)

On August 23, 2011, at 1351 EDT, a magnitude 5.8 (Richter scale) earthquake struck near Mineral Virginia, which is located close to the North Anna nuclear power station. The North Anna station experienced a loss of offsite power due to trips of the three Reserve Station Service Transformers (RSST's). The loss of offsite power resulted in trips of both Turbine Generators leading to automatic trips of both Reactors on negative rate.

All control rods inserted into the core. Decay heat is being removed via the steam dumps to atmosphere. No personnel injuries were reported. All four EDG's started and loaded onto their respective busses.

One resident was in the control room observing Unit 1 testing of the Turbine Drive AFW pump (TDAFWP). The other responded to the Emergency Operations Facility (EOF). The 2H EDG experienced a significant cooling leak on a gasket. The Alternate AC (AAC) EDG was started and aligned to power the 2H bus. All three RSST's were unavailable. On Unit 1, the Motor Drive AFW (MDAFWP) started and aligned for Steam Generator Feed.

The TDAFW pump was being tested On Unit 2, the AFW started and aligned normally and was feeding all S/G's.

Spent Fuel Pool (SFP) cooling lost for about 90 minutes but no significant heat up was noted (common SFP for both units). Dam was inspected with no damage noted.

As of this morning (8/24/2011):

The region is still in monitoring Mode and maintaining a bridgeline with the licensee. The licensee is still in an Alert. Off site power has been restored. All three RSST's were re-energized after inspection and realigned to the E busses. The 2H EDG is still inoperable but available. They are awaiting results of post maintenance testing to declare it operable.

Unit 1: Licensee restarted 1C RCP. They are using it to establish forced circulation and mix in the boron so they can verify adequate boron concentration and proceed to cold shutdown.

Unit 2: Making preps to start 2C RCP and stabilize the plant for Cold S/D. They will cool down the plants one at a time.

The licensee has removed the old seismic plates from 01-ER-RCDR-274A, B, & C (AB, CC HX area) and installed new plates. The old plates have been cleared through Health Physics and are in the I&C shop. The licensee is continuing with removal of the plates from the aux bldg basement which is a contaminated area.

The plates will be sent to Engdahl Enterprises in California for analysis.

Region is performing an MD 8.3 reactive inspection evaluation for this event at North Anna.

At 1116 EDT today, North Anna downgraded their Alert to a Notification of Unusual Event (NOUE) based on equipment alignments and safety equipment inspection results. At 1140 EDT, the NRC (Region 2) exited Monitoring Mode based on their clear understanding of the event and licensee priorities at North Anna.

At 1315 EDT, North Anna notified the NRC Operations Center that they have exited their NOUE. The basis was that all plant walkdowns and inspections were completed and the condition no longer exists for the NOUE declaration.

See Press Release: 11-153 NRC Monitoring Alert at North Anna Following Virginia Earthquake See PNO-1l-1 1-005 (ADAMS ML112360103)

NOTE: A PNO update was issued (will be screened tomorrow) - see attached PNO-1I.1- -005A.

2

,fPass to the TRG Leads for AFW, ECCS, Electrical Power, EDGs, Emergency Preparedness,

'Ioodinq/Missiles, Spent Fuel Handling, Structural and to NRO. Assigned to Bob Bernardo.

ope 3

.-'1/4

• (i.e., Screened Ireviewed against LIC-401 criteriafor initiating an "Issue for Resolution" (IFR), which is !OEB's process for conducting further evaluation of an issue to determine what, if any, additional actions should be taken to communicate and organizationallylearn from OpE.)

SNOT, HIS SUMM Y IS OFFI L USE ON

• • • AY CO AIN ENSITI PIOPRIET R OR NR N RNAL E NLY IN R ATIO oOT FO WARD NNYPRTIO' S OU IDE F NR WIT UTF ST T NGP S ROM IG ATOR Attendees at Screening Meeting:

Bob Bernardo Jesse Robles Mark King Russ Haskell Dave Garmon Doug Copeland (NRO)

Mary Wegner (RES) - by phone 4