05000327/FIN-2011002-03
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Finding | |
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| Title | Loss of 480-V Motor Control Center Due To Inadequate Breaker Replacement Maintenance |
| Description | A self-revealing non-cited violation of Unit 1 TS 6.8, Procedures & Programs, was identified for the licensees failure to provide adequate procedures for maintenance involving the replacement of a safety-related 480V breaker. This resulted in the normal feeder breaker for the safety related 1A2 reactor motor operated valve (MOV) board unexpectedly tripping open when energized following maintenance, causing a loss of power to the board. The licensee entered this issue into their corrective actions program as PER 320274. Licensee corrective actions included revising the applicable breaker maintenance procedure, and reinforcing expectations regarding peer checking and procedure use and adherence. The finding was determined to be greater than minor because it was associated with the procedure quality attribute of the mitigating systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the loss of power to the 1A2 reactor MOV board resulted in the inoperability of its associated MOVs affecting two trains of AFW, one train of containment spray (CS), feedwater isolation valves, and containment isolation valves. Using Inspection IMC 0609, Significance Determination Process, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to be of very low safety significance (Green) since it did not represent an actual loss of safety function of a single train for greater than the associated TS allowed outage time. The cause of this finding was determined to have a cross-cutting aspect in the area of Human Performance associated with the Resources component. The work package was not adequate to assure nuclear safety due to the complexity and ambiguity associated with the procedure step which involved the jumper installation requirement. H.2(c). |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2011002 Section 1R15 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | R Rodriguez E Guthrie P Higgins C Young M Speck J Montgomery W Deschaine |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Sequoyah - IR 05000327/2011002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2011Q1
Self-Identified List (Sequoyah)
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