At 0225 EST on 02/16/04, the licensee declared an Unusual Event due to the instrument air/service air system service air compressor controller exploding due to an electrical fault. Instrument air compressor alarm #H-16 actuated. The backup 'A' and 'B' instrument air compressors auto started. The licensee immediately electrically isolated the service air compressor controller. The licensee declared the Unusual Event in accordance with
EAL 8.3.2, an explosion or detection of explosion affecting plant equipment or structures within plant protected area boundaries. No other plant equipment or structures were affected. The plant is stable at 100% power. There is no indication of tampering or foreign objects inside the controller. The licensee is investigating the cause. The licensee notified the NRC Resident Inspector and State and Local Officials. The licensee does not plan to issue a press release.
- * * Update at 0425 EST on 02/16/04 from John White to Jolliffe * * *
At 0420 EST on 02/16/04, the licensee terminated the Unusual Event based on the service air compressor controller being electrically isolated and removed from service and the surrounding area secured. The licensee is continuing to investigate the cause of the electrical fault. Plant security personnel determined in accordance with their security tampering procedure that this event is clearly not security related. The licensee notified the NRC Resident Inspector and State and Local Officials of the termination of the Unusual Event. Notified R1DO
James Trapp,
NRR EO John Hannon, DIRO Susan Frant, TAS Hahn,
FEMA Ken Sweetser, and
DHS John Frost.
