05000456/FIN-2010004-03
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Finding | |
|---|---|
| Title | Unplanned Cooling Water Flow Reduction during Essential Service Water IST Surveillance |
| Description | A self-revealed Green finding and an associated Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, was identified after the licensee failed to follow procedures during an essential service water inservice test on August 24, 2010. Specifically, during the section of the procedure utilized to establish testing conditions, the licensee throttled the wrong valve resulting in an unplanned reduction in flow to safety-related structures, systems, and components. This flow reduction resulted in the Train B equipment being declared inoperable for approximately 5 minutes. The licensee entered this issue into the CAP as IR 1105448. Corrective actions for this issue included returning the Unit 2 essential service water system to operable status by restoring the required valve lineup and a corrective action assignment to provide additional training to the operating crews on the use of human error prevention techniques. The inspectors determined that this finding was more than minor, because it was associated with the Human Performance attribute of the Mitigating Systems Cornerstone and impacted the cornerstone objective of ensuring the availability of systems that respond to initiating events to prevent undesirable consequences. This finding was determined to be of very low safety significance based on a Phase 3 Significance Determination Process analysis that conservatively bounded the risk of this event to be less than 1.0E-7/yr. The inspectors concluded that this finding was associated with the cross-cutting aspect of Work Practices in the Human Performance cross-cutting area because adequate human error prevention techniques were not effectively used to ensure that the surveillance activity was performed properly (H.4(a)). |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2010004 Section 1R22 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | D Betancourt E Duncan J Benjamin M Perry M Thorpe Kavanaugh T Go |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Braidwood - IR 05000456/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2010Q3
Self-Identified List (Braidwood)
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