At 1129 EDT on 03/28/11, smoke was detected coming from an elevator power supply transformer in the "B"
Residual Heat Removal (
RHR) vault. The licensee declared a Unusual Event at 1143 EDT. At 1146 EDT the fire brigade responded and found smoke only and no flame. The smoke stopped when the cabinet was de-energized. At 1158 EDT, the fire was proven to be out when the cabinet was opened. No fire fighting extinguishing agents were used. There was no damage to other plant equipment and no personnel injuries. At 1151 EDT, the licensee notified the States of
New Hampshire and
Massachusetts and at 1209 EDT, activated their
Technical Support Center (
TSC). The plant was operating at 100% power and remained stable during and after the event.
The licensee notified the NRC Resident Inspector.
- * * UPDATE FROM JEFF MCNALLY TO JOHN SHOEMAKER AT 1341 EDT ON 03/28/11 * * *
At 1243 EDT on 03/28/11, the Unusual Event was terminated. Subsequent investigation has revealed that no plant equipment damage beyond a power transformer that supplies an equipment elevator occurred. There was no indication of [visible] flame (smoke only) and no personnel injuries as a result of the event.
The licensee notified the NRC Resident Inspector.
Notified R1DO (Powell),
NRR EO (Cheok),
IRD (Morris).