05000282/FIN-2009010-01
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Finding | |
|---|---|
| Title | Failure to Ensure Design Measures Were Appropriately Established for the Unit 1 Component Cooling Water System |
| Description | An inspector identified Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified due to the licensees failure to establish design control measures to ensure that the design basis for the Unit 1 component cooling water system (CCW) was correctly translated into specifications, drawings, procedures, and instructions. Specifically, the licensee failed to ensure that the safety-related function of the CCW system was maintained following a tornado/high winds induced failure of the CCW system piping to the 122 spent fuel pool heat exchanger. Corrective actions for this issue included providing procedural guidance to isolate the Unit 1 CCW system from the 122 spent fuel pool heat exchanger following the receipt of a tornado watch and evaluating the need for additional tornado missile protection for the CCW system piping to the 122 spent fuel pool heat exchanger. This finding was determined to be more than minor because it impacted the design control and external events aspects of the Mitigating Systems Cornerstone. The finding also impacted the Mitigating Systems Cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. This finding was determined to be of very low safety significance due to the very low probability of the Prairie Island Nuclear Generating Plant experiencing a high wind condition that could generate a missile large enough to fail the Unit 1 CCW system piping to the 122 spent fuel pool heat exchanger. The cause of this finding was related to the cross-cutting element of Human Performance, Decision Making because the licensee failed to make safety-significant and risk-significant decisions using a systematic process to ensure that safety was maintained H.1(a |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2009010 Section 4OA5 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | K Stoedter L Kozak P Zurawski |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - Prairie Island - IR 05000282/2009010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2009Q3
Self-Identified List (Prairie Island)
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