An Alert was declared at 13:19
CST for Unit 2 due to a loss of all main control board (MCB)
annunciator capability.
I&C [instrumentation & controls] personnel were working on a light bulb which tripped a breaker thus losing all MCB
annunciator capability. The condition was recognized and an Alert was declared. The deficiency was corrected and the breaker supplying the
annunciator system was reclosed, restoring all
annunciator capabilities. The total time without
annunciator capability was 14 minutes. The Alert was terminated at 13:39
CST. Unit 1 [was not affected by this event and] is currently Mode 1, 100%." Unit 2 is currently defueled.
The licensee notified the NRC Resident Inspector along with State, local, and other government agencies. The licensee will be issuing a press release. Notified
NRR Jim Dyer. External notifications also included
HHS (Miller).