05000254/FIN-2009002-05
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Finding | |
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| Title | Failure of the Unit 2 Emergency Diesel Generator Cooling Water Pump |
| Description | A self-revealed finding of very low safety significance (Green) and NCV of 10 CFR 50, Appendix B, Criterion III, Design Control was identified when the Unit 2 diesel generator cooling water pump failed on November 12, 2008, due to damage caused by inter-granular stress corrosion cracking (IGSCC). The licensees staff failed to apply appropriate rigor during the design and procurement process for pump replacement parts resulting in installation of vendor-supplied components that were not suited to the application and operating methodology for the emergency diesel generator cooling water system. The pump was repaired and returned to service the next day. Additionally, the remaining pumps were started to demonstrate that they were functional at the time of the Unit 2 pump failure. The inspectors concluded that the failure to implement measures that assured the equipment was suitable for the process environment was of very low safety significance (Green) because only one pump of three subsystems was degraded to the point where operability and function was affected. Additionally, the licensee process did not validate the pump vendors compliance with all procurement specifications, instead assuming that the vendors communications were complete, resulting in no evaluation of changes to wear ring materials. Inspectors have determined that this behavior is cross-cutting in Human Performance, Decision-making, for failure to use conservative assumptions in communications with the vendor and ensuring all of the vendor supplied parts were appropriate to support the pump function (H.1(b)). (Section 4OA3 |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2009002 Section 4OA3 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | G O'Dwyer R Jickling R Langstaff C Matthews W Slawinski M Ring J Mcghee B Cushman J Coroju-Sandin |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Quad Cities - IR 05000254/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2009Q1
Self-Identified List (Quad Cities)
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