05000400/FIN-2014008-01
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Finding | |
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| Title | Failure to Identify and Evaluate All Targets Within the Zone of Influence of Ignition Sources |
| Description | An NRC-identified non-cited violation of 10 CFR 50.48 (c) and National Fire Protection Association Standard (NFPA) 805 Section 2.4.3.2 was identified for the licensees failure to address in the Fire Probabilistic Risk Assessment (Fire PRA) the risk contribution associated with all potentially risk significant fire scenarios for a given fire compartment/fire area. The licensee did not identify and evaluate all targets that were within the zone of influence (ZOI) of ignition sources for selected fire scenarios which could potentially contribute to the risk for the fire scenarios. The licensee entered the issue in the corrective action program as Nuclear Condition Reports 682633 and 685355 and established an hourly roving fire watch as compensatory measures. The licensees failure to comply with the requirements of 10 CFR 50.48(c) and NFPA 805 was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the reactor safety mitigating systems cornerstone attribute of protection against external factors (i.e., fire) and it adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The missed targets in the ZOI for the selected fire scenarios had the potential to impact the ability to achieve safe and stable conditions. The finding was screened in accordance with NRC IMC 0609, Significance Determination Process, Attachment 4, Initial Characterization of Findings, which determined that an IMC 0609, Appendix F, Fire Protection Significance Determination Process, review was required as the finding affected post-fire SSD. Using IMC 0609, Appendix F, Attachment 1, Fire Protection Significance Determination Process Worksheet, the finding was screened as Green in step 1.6.1 Screen by Licensee PRA-Based Safety Evaluation. An SDP Phase 3 analysis was performed to document the review of the risk determination of the missed ignition source-target interactions using the licensees Fire PRA model. A senior reactor analyst performed the Phase 3 SDP analysis in accordance with the guidance in IMC 0609 Appendix F and NUREG/CR-6850 Revisions 0 and 1. The evaluation determined that the missed ignition source-target interactions resulted in a CDF increase of 5.91E- 8/year, a Green finding of very low safety significance. There was no cross cutting aspect assigned to this finding because it was not indicative of current licensee performance since the original ignition source and target walkdowns were performed in 2006 and 2007. |
| Site: | Harris  |
|---|---|
| Report | IR 05000400/2014008 Section 1R05 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | J Montgomery J Patel M Thomas P Braxton S Shaeffer B Monk D Jones G Macdonald G Wiseman |
| Violation of: | 10 CFR 50.48 |
| INPO aspect | |
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Finding - Harris - IR 05000400/2014008 | |||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2014Q2
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