05000348/FIN-2015004-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10 CFR 50, Appendix B, Criterion III, Design Control, required in part, design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews. Contrary to these requirements, the licensee failed to ensure the MPU override timer setting was documented and reviewed for impacts during the initial design implementation of the governor for the Unit 2 TDAFW pump in 2010 and during a subsequent design change that installed a parallel start circuit in 2011. This issue was documented in the licensees CAP as Condition Report (CR) 10009536. A detailed risk evaluation was performed in accordance with NRC IMC 0609 Appendix A using the Farley SPAR model and fire risk data from the licensees Farley Fire Probabilistic Risk Assessment model. The major analysis assumptions included: recovery credit for TDAFW pump restart, a short exposure interval, actual TDAFW pump failure data for Unit 2, and no credit for the reactor coolant pump shutdown seals. The dominant sequence was a loss of service water with a failure of the TDAFW pump and a failure to recover the pump leading to core damage. The result was a finding of very low safety significance (Green). |
| Site: | Farley  |
|---|---|
| Report | IR 05000348/2015004 Section 4OA7 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | K Miller P Niebaum R Patterson S Sandal |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Farley - IR 05000348/2015004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2015Q4
Self-Identified List (Farley)
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