05000254/FIN-2009002-03
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Finding | |
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| Title | Unit 1F Drywell Cooler Improper Restoration From Maintenance |
| Description | A self-revealed finding of very low safety significance was identified for incorrect wiring of the circuit breaker for the 1F drywell cooler following system restoration from a breaker cubicle inspection. The wiring discrepancy was not detected in the post-maintenance testing and resulted in the drywell cooler motor rotating in the wrong direction. This equipment malfunction resulted in a high temperature alarm in the upper area of the Unit 1 drywell. The wiring deficiency was corrected and the 1F drywell cooler was restored to service. Temperatures in the Unit 1 drywell returned to normal. The inspectors determined that the incorrect wiring of the circuit breaker for the 1F drywell cooler was a performance deficiency and was more than minor because, if left uncorrected, the failure to correctly reinstall wiring could lead to unplanned unavailability of safety-related or risk-significant equipment and would become a more significant safety concern. This performance deficiency also challenged the Mitigating Systems Cornerstone attribute of availability for equipment operated per emergency operating procedures. The inspectors concluded that the issue was of very low safety significance (Green) because the issue involved a single drywell cooler and did not impact the function, reliability or capability of the other six drywell coolers or any other equipment that would be operated per the emergency operating procedures. The inspectors determined that this finding was cross-cutting in the area of Human Performance, Work Practice because inadequate documentation of work activities was a significant contributor to the performance deficiency (H.4(a)). (Section 1R19 |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2009002 Section 1R19 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | G O 'Dwyer R Jickling R Langstaff C Matthews W Slawinski M Ring J Mcghee B Cushman J Coroju-Sandi |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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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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