05000341/FIN-2008002-03
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Finding | |
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| Title | Failure To Perform A Proper Engineering Evaluation On Replacing The Torus-To-Reactor Building Vacuum Breaker Differential Pressure Switches |
| Description | A self-revealing finding of very low safety significance and associated NCV of 10 CFR 50, Appendix B, Criterion III, Design Control, was identified for the failure to perform a proper engineering evaluation. The licensee replaced both differential pressure switches associated with two torus vacuum breakers with a different model than previously installed but failed to ensure the suitability of the replacement switches for use in the intended application. Once identified, the licensee replaced both switches with suitable components. The licensee entered this issue into their corrective action program. This finding was more than minor because the licensee installed both torus vacuum breaker switches without testing them under normal operating conditions to ensure they would perform their intended function. Specifically, both vacuum breakers were unavailable to provide their low pressure relief function after operating under normal conditions. This finding was of very low safety significance because the calculated change in large early release frequency was 8.42E-8. The inspectors determined the finding was associated with cross-cutting aspect H.2(c), Human Performance, Procedures |
| Site: | Fermi  |
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| Report | IR 05000341/2008002 Section 1R15 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | T Steadham M Phalen R Morris C Lipa |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Fermi - IR 05000341/2008002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2008Q1
Self-Identified List (Fermi)
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