05000458/FIN-2009008-01
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Finding | |
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Title | Inadequate Operability Determinations for a Degraded Diesel Exhaust Pipe |
Description | The inspectors identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures and Drawings for twice failing to perform an adequate operability evaluation on the Division II diesel generator after the number 8 cylinder exhaust pipe cracked and later when two of four exhaust flange bolts failed. The finding is more than minor because it affects the mitigating systems cornerstone objective to ensure the availability, reliability, and capability of systems responding to initiating events to prevent undesirable consequences. The team determined that a Phase 3 significance determination was required because the finding screened as potentially risk significant due to potential loss of safety function of a single train. Region IV senior risk analysts performed a Phase 3 significance determination and determined that the issue represents a finding of very low safety significance (Green). This violation has a crosscutting aspect in the area of problem identification and resolution associated with the corrective action program because the licensee did not thoroughly evaluate problems such that the resolutions address causes and extent of conditions, as necessary. Specifically the licensee failed to properly prioritize and evaluate for operability a degraded Division II diesel generator Number 8 cylinder exhaust pipe and flange P.1(c) |
Site: | River Bend |
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Report | IR 05000458/2009008 Section 4OA2 |
Date counted | Sep 30, 2009 (2009Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | G Werner D Bollock B Rice C Norton |
CCA | P.2, Evaluation |
INPO aspect | PI.2 |
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Finding - River Bend - IR 05000458/2009008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2009Q3
Self-Identified List (River Bend)
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