05000254/FIN-2008002-02
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Finding | |
|---|---|
| Title | Safe Shutdown Makeup Pump Low Discharge Pressure |
| Description | A self-revealing finding of very low safety significance and a NCV of 10 CFR 50, Appendix B, Criterion V, was identified on December 17, 2007, for an inadequate pump fill and vent procedure that resulted in pump degradation to the safe shutdown makeup pump. QCOP 2900-01, Safe Shutdown Makeup Pump System Preparation for Standby Lineup, was used to fill and vent the safe shutdown makeup pump following maintenance and, although the system passed surveillance testing, air was later identified in the system. Air migration within the system was later identified as the cause of safe shutdown makeup pump degradation, which resulted in the subsequent failure to meet TS flow requirements. Corrective actions for this event included the installation of additional vents on the suction piping, an aggressive extent of condition evaluation of other susceptible systems, refurbishment of the safe shutdown makeup pump, briefing personnel on the trending failure, and a review of inservice test alert setpoints to ensure triggers are set appropriately to allow corrective actions to be planned for program components. The inspectors determined that the failure to provide procedural direction that ensured adequate venting was more than minor because it impacted the Mitigating Systems Cornerstone attribute of Equipment Performance and affected the availability and reliability of the system. This finding was determined to be of very low safety significance because although operability of the pump was impacted, the credited safety function was maintained. Contributing to the performance deficiency was that the monitoring program in place was not effective in identifying the gradual degradation before pump operability was impacted. Additionally, the alert threshold for the pump parameter in the monitoring program, which would trigger additional actions such as pump overhaul, was set below the TS allowable value and was thus an ineffective barrier to prevent loss of operability or function. The inspectors determined this failure to be cross-cutting in the area of Problem Identification and Resolution, Corrective Action Program, Corrective Actions due to the failure of the licensee to address the adverse trend in pump performance in a timely manner, commensurate with the safety significance of the components (P.1(b)). (Section 1R13 |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2008002 Section 1R13 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | A Barker B Cushman C Mathews D Jones J Mcghee K Stoedter M Ring R Jones W Slawinski |
| CCA | P.4, Trending |
| INPO aspect | PI.4 |
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Finding - Quad Cities - IR 05000254/2008002 | ||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2008Q1
Self-Identified List (Quad Cities)
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