05000456/FIN-2010010-04
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Finding | |
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| Title | Evaluation of Operating Experience concerning Reactor Building Flashing |
| Description | A self-revealed finding of very low safety significance was identified for the inadequate evaluation of operating experience done in accordance with the station procedure. Specifically, the licensee evaluated an event at another plant where building material was dislodged during a steam release resulting in a loss of off-site power and concluded the event was not applicable to Braidwood station. The evaluation did not address a previous event at Braidwood where the reactor building flashing was dislodged during a steam release. It did conclude, however, that off-site power could be adversely affected by debris. During the dual unit trip on August 16, 2010, reactor building flashing was dislodged during a steam release and was found on power lines and in the vicinity of the off-site power supplies. The licensee entered this issue into its corrective action program and structurally restrained the flashing left on the reactor building. The finding was determined to be more than minor because the finding was associated with the Initiating Events Cornerstone attribute of protection against external factors and affected the cornerstone objective of limiting the likelihood of those events that challenge critical safety functions during shutdown. Specifically, not protecting the off-site power supplies from flashing falling from the reactor building could result in a loss of off-site power and would challenge the emergency diesel generators to supply alternating current power to safety-related equipment during the plant shutdown. The finding screened as very low safety significance (Green) because it was determined not be a loss of cooling accident or External Event initiator and would not contribute to both a plant trip and the likelihood that mitigation equipment or functions would not be available. There is no cross-cutting aspect because the 2007 evaluation completed on the operating experience is not reflective of current performance. |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2010010 Section 4OA5 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | G Shear J Jandovitz M Thorpe Kavanaugh N Feliz Adomo T Go |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2010010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2010Q3
Self-Identified List (Braidwood)
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