05000382/FIN-2009009-04
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Finding | |
|---|---|
| Title | Failure to Properly Analyze the Affect of Acceptable Reverse Flow Through the Emergency Feedwater Check Valves |
| Description | The team identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control. Specifically, the licensee failed to analyze the effects of the acceptable back leakage of 25 gpm from the emergency feedwater pump discharge check valves on the integrity of the emergency feedwater pumps and the integrity of its suction piping. The acceptable back leakage could possibly cause the pump to reverse rotate, and provide a path for high pressure fluid to go through the pump and pressurize low pressure suction piping. The licensee has entered this item in their corrective action program as Condition Report CR-WF3-2009-04528 and performed an operability assessment for this issue. This finding is more than minor because it affected the mitigating systems cornerstone attribute of design control to ensure the availability, reliability, and capability of safety systems that respond to initiating events. This finding closely parallels Inspection Manual Chapter 0612, Appendix E, Example 3.j, Not Minor: If the engineering calculation error results in a condition where there is now a reasonable doubt on the operability of a system or component, or if significant programmatic deficiencies were identified with the issue that could lead to worse errors if uncorrected. This finding was determined to be of very low safety significance (Green) because this design issue did not result in loss of function, did not represent an actual loss of a system safety function, did not result in exceeding the Technical Specification allowed outage time, and did not affect external event mitigation. The inspectors determined that the finding has a crosscutting aspect in the area of Problem Identification and Resolution, Self and Independent Assessment. The licensee conducted a Waterford 3 Component Design Basis Assessment, on April 20-23, 2009, that included the emergency feedwater AB turbine-driven pump in the Scope of Components to be Reviewed During CDBI Assessment, and failed to identify the impact of reverse flow on the integrity of the pump and its suction piping [P.3.(a) |
| Site: | Waterford  |
|---|---|
| Report | IR 05000382/2009009 Section 1R21 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | K Clayton R Kopriva J Adams M Runyan J Chiloyan M Yeminy R Kellar B Correll |
| CCA | P.6, Self-Assessment |
| INPO aspect | CL.2 |
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Finding - Waterford - IR 05000382/2009009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2009Q3
Self-Identified List (Waterford)
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