05000397/FIN-2011006-01
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Finding | |
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| Title | Failure to Promptly identify and Correct Degraded Flood Barriers |
| Description | The team identified a Green noncited violation of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, because Energy Northwest failed to promptly identify and correct degraded flood barrier floor coatings, which protected the Division 2 safety-related electrical switchgear room, remote shutdown room, and main control room from water intrusion. In 2002, flooding above the Division 2 electrical switchgear and remote shutdown rooms resulted in water intrusion into these rooms. The corrective action to prevent recurrence was to apply epoxy paint to the concrete floors above these rooms to ensure the floors would be leak tight. In April 2004, a degraded flood barrier floor coating was identified and operations staff requested an engineering evaluation. An hourly flood watch was established, however, an engineering evaluation was not performed to identify and correct the material deficiency and no justification was provided for establishing an hourly flood watch. The team determined that from April 2004, to September 14, 2011, at least 30 action requests were written that identified degraded epoxy coated flood barriers. Although the flood barriers were eventually patched, no engineering evaluation was performed to identify and correct the material deficiency. The team determined that the flood barriers were degraded approximately 36 percent of the time. The licensee entered this issue into the corrective action program as Action Request/Condition Report 249288. The finding was more than minor because it affected the Mitigating Systems Cornerstone objective to ensure the availability and reliability of systems that respond to initiating events to prevent undesirable consequences and if left uncorrected, could become a more significant safety concern because a flood in the area could adversely affect safety-related equipment. Using NRC Manual Chapter 0609 Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, dated January 10, 2008, the finding initially screened as potentially risk significant due to the flooding hazard, however, it was determined to be of very low risk significance (Green) because there was no actual loss or degradation of the safety function of the equipment protected by the flood barrier. In addition, this finding had a crosscutting aspect in the area of human performance associated with decision making because the licensee failed to communicate to persons who have the need to know in order to perform work safely, the basis for the decision to implement an hourly flood watch and not perform an engineering evaluation in a timely manner [H.1 (c)]. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2011006 Section 4OA2 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Tharakan R Cohen N Okonkwo H Freeman D Powers |
| CCA | H.10, Bases for Decisions |
| INPO aspect | CO.2 |
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Finding - Columbia - IR 05000397/2011006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2011Q3
Self-Identified List (Columbia)
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