05000425/FIN-2010002-01
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Finding | |
|---|---|
| Title | Ineffective Corrective Action Renders Unit 2 CCW Pump #4 Inoperable |
| Description | A self-revealing non-cited violation (NCV) for failure to meet the requirements of 10 CFR 50, Appendix B, Criterion XVI was identified. Specifically, for ineffective corrective maintenance performed on the Unit 2 Component Cooling Water (CCW) Pump #4. The corrective maintenance actions performed on CCW pump #4 in October 2009 to repair damage due to contact between the throttle bushing and the shaft sleeve on the inboard mechanical seal were ineffective, and consequently, the same damage to the inboard mechanical seal occurred in January 2010 when the pump was again operated. As a result, the Unit 2 CCW pump #4 was rendered inoperable for the second time in three months due to the same mechanical seal issue. This issue was greater than minor because it was associated with a cornerstone attribute and adversely affected the objective of the Mitigating Systems cornerstone. Specifically, the performance deficiency was an equipment performance issue which affected the availability, reliability, and capability of the B train emergency core cooling system (ECCS) to respond to a loss of coolant accident (LOCA). The finding was determined to be of very low safety significance (Green) because the event did not represent in an actual loss of safety function of a single train for greater than its Technical Specification allowed outage time. The inspectors determined that 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 corrective maintenance actions used to resolve the mechanical seal issue on CCW pump #4 were less than adequate. |
| Site: | Vogtle  |
|---|---|
| Report | IR 05000425/2010002 Section 1R12 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | S Shaeffer A Nielsen G Kuzo M Cain T Chandler |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Vogtle - IR 05000425/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Vogtle) @ 2010Q1
Self-Identified List (Vogtle)
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