VC Summer operators declared an Unusual Event due to one fire detector being in alarm inside the reactor building 'B'
steam generator cubicle. There are no other fire detectors in alarm nor are there any elevated containment temperatures. The licensee is making preparations to enter the reactor building to investigate. The reactor continues to operate at 100% power.
The licensee contacted the NRC Resident Inspector.
- * * UPDATE AT 1640 ON 7/8/2012 FROM BRUCE THOMPSON TO MARK ABRAMOVITZ * * *
On 7/8/2012 at 1202 EDT, an Unusual Event was declared. The event was [declared based on] HU 2.1 'Fire within the Protected Area not extinguished within 15 minutes of detection' and was based on a single smoke detector alarm in the Reactor Building. There were no other indications of a fire. The NRC was initially notified at 1230 EDT.
At 1542 personnel entered the Reactor Building and verified that no fire had occurred. A faulty smoke detector is suspected.
At 1634 the Unusual Event was terminated.
The smoke detector was declared inoperable.
The licensee notified the NRC Resident Inspector. Notified the
IRD (Marshall), R2DO (Bonser),
NRR (McGinty),
DHS SWO,
FEMA, and
DHS NICC.