05000482/FIN-2008006-01
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Finding | |
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| Title | Twenty-One Examples of Failure to Follow Seismic Requirements of Scaffolding Procedure |
| Description | The team identified a non-cited violation of 10 CFR Part 50 Appendix B Criterion V, in which 21 scaffolds in 10 plant areas that were in contact with or closer to plant equipment than procedure allowed. The procedure required engineering evaluations did not contain any technical bases as to the acceptability of as built scaffolds. Subsequent engineering evaluation of each of the incorrect scaffolding installations confirmed that the configurations did not challenge operability. The NRC identified previous concerns with the erection of scaffolds, yet the licensee failed to take action to correct this issue. The team evaluated the significance of this finding using Phase 1 of Inspection Manual Chapter 0609, Appendix A, Significance Determination of Reactor Inspection Findings for At-Power Situations, and determined that the finding was of very low safety significance because the issue resulted in 21 unevaluated scaffolds which are likely not to challenge the ability of the plant to safely shutdown after an earthquake. As such, under Phase 1 screening, the deficiency is not related to a qualification or design deficiency, it did not represent a loss of safety function for a train or system as defined in the plant specific risk-informed inspection notebook, and did not screen as risk significant for seismic external events, because the affected systems were considered degraded, but operable. Using these inputs, the performance deficiency screened to Green. The team determined that the finding had a human performance crosscutting aspect in the area associated with decision making because the licensee failed to adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action. Specifically, Wolf Creek Generating Station did not conduct any review of engineering decisions to verify the validity of the underlying assumption that equipment and scaffolding could be in contact or closer than the established limit (H.1(b)) (Section 40A2.e(1)) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2008006 Section 4OA2 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | S Cochrum J Adams C Long D Proulx H Abuseini L Smith |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Wolf Creek - IR 05000482/2008006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2008Q1
Self-Identified List (Wolf Creek)
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