05000341/FIN-2011002-03
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Finding | |
|---|---|
| Title | Reactor Scram due to Loss of Vacuum |
| Description | A finding of very low safety significance (Green) for failure to evaluate and incorporate the operating experience received from the Boiling Water Reactors Owners Group (BWROG) Off-Gas committee was self-revealed when Fermi 2 experienced a reactor scram due to degraded condenser vacuum on October 24, 2010. The cause of the loss of vacuum was the failure of No. 3 steam jet air ejector (SJAE) steam supply to nozzle gasket, which caused steam erosion of the seating surface and loss of capacity. The licensee repaired the air ejector. The inspectors determined this finding was more than minor because it was associated with the equipment performance attribute of the Initiating Events Cornerstone and impacted the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The issue resulted in a scram. This finding was determined to be of very low safety significance, Green, because, while it did contribute to the likelihood of a reactor trip, it did not contribute to the likelihood that mitigating equipment would not be available. This finding was not cross-cutting because the licensee received the operating experience input over 3 years ago and was not necessarily indicative of current licensee performance. Finally, no violation of NRC requirements was identified since the SJAEs and the off-gas system are nonsafety-related. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2011002 Section 4OA2 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events, Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | M Munir S Sheldon R Morris R Jones J Bozga M Jones T Hartman |
| INPO aspect | |
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Finding - Fermi - IR 05000341/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2011Q1
Self-Identified List (Fermi)
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