05000259/FIN-2017002-01
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Finding | |
|---|---|
| Title | Inadequate Fire Risk Evaluation for Postulated Fires Affecting EECW Strainers |
| Description | Green . An NRC- identified non- cited violation of 10 CFR 50.48(c) and NFPA 805, Section 2.4.2.4 was identified for the licensee's failure to perform an adequate engineering analysis to determine the effects of fire on the ability to achieve the nuclear safety performance criteria . Specifically, the licensees fire risk evaluation (FRE) of the effects of fire on the Emerge ncy Equipment Cooling Water (EECW ) strainers did not have an adequate basis . As an immediate corrective action, the licensee performed plant -specific analyses to determine the effects of fire on the functionality of EECW strainers and EECW system . The violation was entered into the licensee's corrective action program as CR 1263434. The performance deficiency was determined to be more -than- minor because it wa s associated with the protection against external factors attribute of t he Mitigating Systems cornerstone and adversely impacted the cornerstone objective in that failure to adequately 3 analyze the effects of fire damaged cables for the EECW strainers and backwash valves impacted the objective of ensuring the reliability of the E ECW system during a fire. This finding was determined to be Green because the finding did not affect the ability to reach and maintain a stable plant condition within the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of a fire event. The inspectors determined that the finding had a cross -cutting aspect of Avoid Complacency (H.12) within the cross- cutting area of Human Performance because the licensee did not recognize that historical assumptions about long -term strainer functionality could contain mistakes and latent issues during development of the nuclear safety capability analysis. |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2017002 Section 1R05 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | D Dumbacher T Stephen A Ruh J Dolecki |
| Violation of: | 10 CFR 50.48 |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
| ' | |
Finding - Browns Ferry - IR 05000259/2017002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2017Q2
Self-Identified List (Browns Ferry)
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