05000306/FIN-2009010-02
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Finding | |
|---|---|
| Title | Failure to Ensure Design Measures Were Appropriately Established for the Unit 2 Component Cooling Water System |
| Description | An inspector identified apparent 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 2 CCW system 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 initiating events (such as high energy line break, seismic or tornado events) in the turbine building. This issue has been preliminarily determined to be of low to moderate safety significance (White).This issue was entered into the licensees corrective action program as corrective action document 1145695. Upon identifying this issue, the licensee immediately declared the Unit 2 CCW system inoperable and entered Technical Specification 3.0.3. The Technical Specification was exited following the closure of several system isolation valves approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> later. The closure of the isolation valves prevented the Unit 2 CCW system from being vulnerable to failure following events in the turbine building. 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. The initiating events in the turbine building could cause the CCW piping to fail. Loss of CCW inventory affects both trains of CCW based on the piping arrangement. The loss of both trains of CCW required a phase 3 significance determination. The results of the phase 3 assessment showed a delta core damage frequency of 3.2E-6, White. 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)). Since both the Unit 1 and Unit 2 cross-cutting aspects are from the same performance deficiency and are separated based on the risk determination, the aspect of H.1(a) counts as one cross-cutting aspect in this report. |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000306/2009010 Section 4OA5 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | Violation: White |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Thomas J Giessnerk Stoedterl Kozak P Zurawskic Pedersong Bowman J Giessner P Lougheed S Orth S West |
| Violation of: | Technical Specification |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - Prairie Island - IR 05000306/2009010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2009Q3
Self-Identified List (Prairie Island)
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