05000348/FIN-2015003-04
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10 CFR 50, Appendix B, Criterion V, Instructions, Procedures and Drawings, required in part that activities affecting quality shall be prescribed by documented instructions, procedures, or drawings of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures or drawings. Procedure, NMP-ES-006, Preventive Maintenance Implementation and Continuing Equipment Reliability Improvement, Version 8.1 stated, PM implementation is complete only after all work has been completed as defined by the PM work scope. Contrary to the above, in July 2013, the licensee partial performed the PM on the 1C diesel generator (DG) automatic transfer switch (ATS) which was incorrectly credited as the full PM. Consequently, the date for the next PM was rescheduled for Aug. 2018 resulting in inadequate preventive maintenance on the 1C DG ATS contributing to failure of the ATS. The failure affected the Mitigating Systems cornerstone and represented a condition where a single train safety function was lost for greater than the Technical Specification (TS) allowed outage time, which required a detailed risk evaluation. The major analysis assumptions included: a 51 day exposure period, no recovery consideration, and the PD was modelled as a potential common cause impact to EDGs 1/2A, 1C and 2C. The dominant sequence was a Loss of Offsite Power with failure of the EDGs and failure to recover either offsite power or the EDGs prior to battery depletion leading to loss of core heat removal and potential core damage. The risk was mitigated by the availability of additional mitigating equipment and the low likelihood of establishing the conditions necessary to require the ATS to transfer to the alternate control power source. This finding screened as very low safety significance (Green). This issue was entered into the licensees corrective action program (CAP) as condition reports (CRs) 10039554 and 10056140. |
| Site: | Farley  |
|---|---|
| Report | IR 05000348/2015003 Section 4OA7 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Nielsen J Rivera K Miller P Niebaum S Sandal T Su J Panfel |
| Violation of: | 10 CFR 50 Appendix B Criterion V Technical Specification Technical Specification - Procedures |
| INPO aspect | |
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Finding - Farley - IR 05000348/2015003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2015Q3
Self-Identified List (Farley)
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