05000361/FIN-2013003-01
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Finding | |
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| Title | Failure to Properly Scope All the Pertinent External Flood Protection Features into the Walkdown List in Accordance with Industry Guidance NEI 12-07 |
| Description | The inspectors identified one finding of very low safety significance for the licensees failure to follow procedures regarding the Fukushima event response for flood protection to comply with NRC endorsed NEI 12-07, Guidelines for Performing Walkdowns of Plant Flood Protection Features. Specifically, the licensee failed to evaluate the conduits beneath the grating of the diesel generator building for inclusion in the walkdown scope and failed to establish adequate procedures that included accurate assessment of the Available Physical Margin of flooding protection features included in the flooding walkdown scope. This finding was entered into the licensees corrective action program as Nuclear Notifications NN 202369978 and NN 202375161. The performance deficiency is greater than minor, and therefore a finding, because it is associated with the Mitigating Systems Cornerstone attribute of Protection Against External Factors (Flood Hazard) and it adversely affects the associated cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined that the finding could be evaluated using the significance determination process in accordance with IMC 0609, Significance Determination Process, and conducted a Phase 1 characterization and initial screening. Phase 1 initial screening determined that IMC 0609 Appendix A, Exhibit 2, Mitigating Systems Screening Questions, should be used. Because the finding did not involve the loss or degradation of equipment or function specifically designed to mitigate a seismic, flooding, or severe weather initiating event (e.g., seismic snubbers, flooding barriers, tornado doors), the finding screened as Green. The finding has a cross-cutting aspect in the area of human performance, associated with the decision-making component, because the licensee did not verify the validity of the underlying assumptions and identify possible unintended consequences. |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2013003 Section 4OA5 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | N Taylor R Lantz J Reynoso J Laughlin G Warnick M Williams C Hale |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - San Onofre - IR 05000361/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2013Q2
Self-Identified List (San Onofre)
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