PNO-II-11-006, Preliminary Notification of Event or Unusual Occurence (Brunswick Unit 2)
| ML113250601 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 11/21/2011 |
| From: | O'Bryan P, Randy Musser NRC/RGN-II/DRP/RPB4 |
| To: | |
| References | |
| PNO-II-11-006 | |
| Download: ML113250601 (1) | |
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-11-006 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 the Region II staff on this date.
Facility Licensee Emergency Classification Carolina Power and Light Company
__X__Notification of Unusual Event Brunswick 2
_____Alert Southport, NC
_____Site Area Emergency Dockets: 50-324
_____General Emergency
__ __Not Applicable
SUBJECT:
BRUNSWICK UNIT 2 DECLARES A NOTICE OF UNUSUAL EVENT (NOUE)
On November 16, 2011, at 3:09 a.m. EST, Brunswick Unit 2 was manually scrammed from 7 percent power and an unusual event was declared due to drywell unidentified leakrate slightly exceeding 10 gallons per minute (gpm). The NOUE was exited at 8:15 a.m. EST on November 16, 2011, when leakage could be maintained below 10 gpm with decreased reactor pressure.
The unit was cooled down and reached cold shutdown at 2:38 p.m. EST on November 16, 2011.
On November 17, 2011, the licensee determined that the unidentified leakage was the result of inadequate reactor vessel head stud tensioning. Based on a reactive inspection evaluation, Region II initiated a special inspection team on November 21, 2011.
This preliminary notification is issued for information only and no further action by the staff is anticipated.
Contacts:
P. OBryan R. Musser (910) 457-9531 (404) 997-4603 Phil.Obryan@nrc.gov Randy.Musser@nrc.gov