05000424/FIN-2012005-01
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Finding | |
|---|---|
| Title | Inadequate Maintenance Procedure Results in Inoperability of NSCW Cooling Tower Fan |
| Description | A self-revealing non-cited violation (NCV) for failure to meet the requirements of 10 CFR Part 50 Appendix B, Criterion V, Instructions, Procedures, and Drawings was identified for failure to provide adequate work instructions in the maintenance procedure used to modify 480V EMAX safety-related switchgear breakers. Specifically, when modifying the breaker by adding a higher amperage closing coil, failure to verify the proper placement of the wire bundle on top of the closing coil following replacement resulted in the safety-related 2A NSW cooling tower fan #3 480V EMAX breaker failing to close when demanded. The licensee replaced the failed breaker and returned the fan to operable status within 21.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />. The finding was more than minor because it impacted the reactor safety mitigating systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences and affected the cornerstone attribute of equipment performance. Since the inspectors answered No to all of the IMC 0609.04 (dated June 19, 2012) Exhibit 2, section A, questions 1-4, mitigating systems cornerstone screening questions, the inspectors concluded that the finding was of very low safety significance (Green). The cause of this finding was related to the corrective action program component of the problem identification and resolution cross-cutting area due to less-than-adequate problem evaluation. P.1(c) Specifically, the licensees extent of cause evaluations performed on previous 480V EMAX breaker failures (caused by restricted movement of the close lever) did not identify the potential of the closing coil wire bundle to interfere with the proper movement of the close lever. The licensees corrective action to the 480V EMAX breaker issue was to revise the maintenance procedure used to perform maintenance on EMAX breakers (procedure 28480-C, 480V EMAX Breaker Maintenance), and then inspect all 480V EMAX breakers on site that had been modified with the higher amperage closing coil to verify that the wire bundles were not interfering with the operation of the close coil. The licensee entered this into their corrective action program as CR 549999 and CR 550736. |
| Site: | Vogtle  |
|---|---|
| Report | IR 05000424/2012005 Section 1R19 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | A Nielsen F Ehrhardt A Vargas-Mendez J Laughlin M Cain B Caballero T Chandler R Williams C Dykes W Pursley |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Vogtle - IR 05000424/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Vogtle) @ 2012Q4
Self-Identified List (Vogtle)
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