05000259/FIN-2009003-05
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Finding | |
|---|---|
| Title | Untimely Actions to Resolve Excessive IBC System Condensation Results in Unit 1 Reactor Scram |
| Description | A Green self-revealing finding was identified for a failure to implement corrective actions in a timely manner to address excessive isophase bus cooling (IBC) system condensation that resulted in a main generator trip and Unit 1 reactor scram caused by water accumulation in the IBC ductwork, which created an electrical ground fault on the main generator isophase busses. An additional drain line was subsequently installed, and operating procedures were revised, to ensure any excessive condensation buildup would be removed from the IBC system during winter operation. This event was entered into the licensees corrective action program as PER 163815. This finding was determined to be greater than minor because it was associated with the Initiating Event Cornerstone attribute of Equipment Performance, and adversely affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during at-power operations. The finding was evaluated using Phase 1 of the At-Power Significance Determination Process, and was determined to be of very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment or functions were not available. The cause of this finding was directly related to the cross-cutting aspect of appropriate and timely corrective actions in the area of Problem Identification and Resolution because the license had identified an abnormal equipment condition related to excessive IBC system condensation for which specified corrective actions were not carried out (P.1.d) |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2009003 Section 4OA3 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Hamilton W Loo H Gepford E Guthrie K Korth R Williams |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Browns Ferry - IR 05000259/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2009Q2
Self-Identified List (Browns Ferry)
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