At approximately
0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> EDT, on October 9, 2012, a low voltage circuit breaker in the Crystal River Unit 3 (CR-3) Emergency Operations Facility (
EOF) tripped due to an electrical fault. The associated loads were powered by backup batteries until they depleted at approximately 1057 EDT. This condition resulted in the loss of dose assessment (
RASCAL) and facility cooling capability.
Dose assessment capability at the EOF was restored by 1335 EDT. During this event, RASCAL could be run from any plant computer outside of the EOF and the results conveyed back to the EOF. EOF ambient temperature is being monitored. An estimated completion time for chiller restoration has not been established. A follow-up notification will be provided when the chiller operation has been restored. This report is being made in accordance with 10 CFR 50.72(b)(3)(xiii).
At no time was the public's or plant employees' health or safety at risk. Due to numerous backup systems, alternate methods were available to calculate dose projections, if required, and communicate the information to the EOF.
The NRC Resident Inspector has been notified.
- * * UPDATE FROM DAVE MCAGY TO CHARLES TEAL AT 2001 EDT ON 10/10/12 * * *
At 1500 EDT on 10/10/12 Chiller Operations for the EOF has been restored. At 1700 EDT on 10/10/12 the EOF returned to normal office temperatures. At no time did temperatures affect the habitability or functionality of the EOF.
The NRC Resident Inspector has been informed.
Notified R2DO (Seymour).
