05000483/FIN-2012003-01
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Finding | |
|---|---|
| Title | Failure to Incorporate Operating Experience for a 10 CFR 50.65(a)(3) Assessment |
| Description | The inspectors identified a finding for failure to ensure that a system credited in the Final Safety Analysis Report for mitigating internal flooding was available and reliable. On May 1, 2012, the licensee discovered the floor drains in the engineered safety feature switchgear rooms for both trains were almost completely plugged from debris and were not capable of passing water at the credited flow rate. This was a result of failure to perform inspections or preventive maintenance on the system since original construction. In May 2005, the NRC issued Information Notice 2005-11 regarding, in part, internal flooding and blocked floor drains. Title 10 of the Code of Federal Regulations 50.65(a)(3) states, in part, that evaluations shall take into account, where practical, industry-wide operating experience. Adjustments shall be made. . . Contrary to the above, in 2005, the licensee evaluated, but did not take action on applicable industry-wide operating experience. In response, the licensee cleaned the drains, created preventive maintenance tasks to verify proper floor drain operation, and was evaluating the planned corrective actions to address the violation. These were documented in Callaway Action Requests 201203302 and 201204582. The inspectors determined that failure to ensure a system credited in the Final Safety Analysis Report was available and reliable to mitigate internal flooding was a performance deficiency. Specifically, the licensee failed to perform preventive maintenance or testing to ensure the engineered safety feature switchgear room floor drains would drain water from the switchgear rooms for both trains at the rate credited for flood mitigation. The inspectors evaluated the performance deficiency in accordance with Inspection Manual Chapter 0612, Appendix B, Issue Screening. This performance deficiency was more than minor because it affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. During a Phase 1 screening for significance the inspectors determined the finding was potentially risk significant due to its contribution to a flooding initiating event. It was referred to a senior reactor analyst who determined that because the delta core damage frequency was less than 1E-6 and the finding was not a significant contributor to the large early release frequency, the finding was of very low safety significance. This finding does not have a cross-cutting aspect because the performance deficiency is not representative of current licensee performance. |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2012003 Section 1R06 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | C Brown C Baron N O'Keefe J Chiloyan A Stone T Hartman E Sanchez Z Hollcraft N Makris K Clayton D Dumbacher A Dunlop R Langstaff |
| INPO aspect | |
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Finding - Callaway - IR 05000483/2012003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2012Q2
Self-Identified List (Callaway)
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