05000254/FIN-2008003-03
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | On January 16, 2008, the Unit 1 diesel generator cooling water pump failed to produce the required differential pressure required for inservice testing surveillance criteria. Issue Report 723296 was written to document this event. In this instance, the recorded pressure was less than the minimum requirement of 79 psid. Analysis of pump performance and work performed revealed that an internal pump condition was the most likely the cause of the degraded pump performance. Disassembly under Work Order 098052 revealed cracking in the wear ring on the inboard side of the impeller. The wear ring had also moved slightly from its original seated position. Engineering trending had previously identified the step changes in pump performance, and identified potential causes. Work orders were developed to eliminate the identified causes, but had not been implemented when the pump failed to develop the required differential pressure. The apparent cause of the cracked inboard impeller wear ring was pump overheating due to insufficient system filling and venting following pump replacement in May 2007. The licensee determined that the improper venting was the result of procedure weakness after draining the suction line for maintenance and the unique suction piping configuration for this pump. The inspectors determined that inadequate venting during restoration for post modification testing in May 2007 due to the lack of clear procedural guidance for the venting activity was a performance deficiency and a violation of TS 5.4.1 requirements to develop and maintain adequate procedures for this system. The procedure deficiency was more than minor as it impacted the Mitigating Systems Cornerstone attribute of Equipment Performance because it impacted the availability of the diesel generator cooling pump. This finding was determined to be of very low safety significance because all of the questions in the SDP Phase 1 worksheet for the Mitigating Systems Cornerstone were answered NO and the issue screened as Green. Corrective actions included overhauling the pump to restore full function and procedure revisions to provide additional detail for complete system venting |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2008003 Section 4OA7 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Matthews W Slawinski M Ring J Mcghee J Tapp R Jones B Cushman |
| INPO aspect | |
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Finding - Quad Cities - IR 05000254/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2008Q2
Self-Identified List (Quad Cities)
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