05000313/FIN-2008005-01
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Finding | |
|---|---|
| Title | Failure to Perform an Adequate Risk Assessment when Disabling a Station High Energy Line Break Barrier |
| Description | The inspectors identified a noncited violation of 10 CFR 50.65(a)(4), Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, associated with the licensees failure to perform an adequate risk assessment for planned maintenance. Specifically, the licensee inappropriately assumed that disassembly of Door 340, a high-energy line break barrier, constituted normal plant ingress and egress. As such, this assumption resulted in an inadequate risk assessment, which failed to adequately evaluate the proposed condition of Door 340 and provide appropriate risk management actions for this condition. This issue was entered into the licensee\'s corrective action program as Condition Report ANO-2-2008-2231. The finding was more than minor because it was similar to the nonminor considerations of Maintenance Rule Example 7.e in NRC Manual Chapter 0612, Appendix E, Examples of Minor Issues, in that the licensees risk assessment contained incorrect assumptions that changed the outcome of the assessment and required additional risk management activities. The inspectors evaluated this finding using NRC Manual Chapter 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process because the finding is a maintenance risk assessment issue. Flowchart 1, Assessment of Risk Deficit, requires the inspectors to determine the risk deficit associated with this issue. This finding was determined to be of very low safety significance because the incremental core damage probability deficit was less than 1 x 10-6. This finding had a crosscutting aspect in the area of Human Performance associated with Decision Making H.1(b), in that the licensees engineering staff failed to use conservative assumptions and failed to verify the validity of the underlying assumptions used when evaluating the potential effects of disabling a high energy line break barrier for maintenance in accordance with 10 CFR 50.65(a)(4 |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2008005 Section 1R13 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | K Clayton A Sanchez J Josey J Clark M Bloodgood I Anchondo |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2008005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2008Q4
Self-Identified List (Arkansas Nuclear)
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