05000373/FIN-2011002-01
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Finding | |
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| Title | Failure to Post Protected Pathway Signs for a Red Risk Path System |
| Description | A finding of very low safety significance and associated NCV of 10 CFR 50.65(a)(4), Maintenance Rule, was identified by inspectors for the licensees failure to implement all necessary prescribed risk management actions during a Unit 2 Reactor Core Isolation Cooling (RCIC) system maintenance window. Specifically, the licensee failed to post protected equipment signs for the Unit 2 systems whose unavailability would have taken the unit into a Red risk condition. The licensee entered this issue into their corrective action program (CAP). The inspectors determined that this performance deficiency is a finding and greater than minor because the licensee failed to implement prescribed compensatory measures of posting signs and barricades to protect the high pressure core spray (HPCS) equipment during the RCIC work window, hence degrading the HPCS safety function during this time; which is similar to Example 7.g in IMC 0612, Appendix E. The inspectors performed a Phase 1 screening with assistance from the Regional Senior Reactor Analyst (SRA) using IMC 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, Flowchart 2, Assessment of Risk Management Actions. The calculated change in Incremental Core Damage Probability (ICDP), or actual increase in risk during this work window, was 5.7x10-9, and the incremental large early release probability (ILERP), was 3.3x10-10. In accordance with Flowchart 2, since the ICDP was less than 1x10-6 and the ILERP was less than 1x10-7, the finding screened as Green. This finding has a cross-cutting aspect in the area of Human Performance, Work Practices, because the licensee failed to conduct first and second verifications and use independent peer checks or other human error prevention techniques when evaluating risk-significant and/or Technical Specification (TS)-related activities, which led to the missed postings for the protected pathway equipment (H.4(a)). |
| Site: | LaSalle  |
|---|---|
| Report | IR 05000373/2011002 Section 1R13 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | N Shah R Ruiz F Ramirez K Riemer M Mitchell J Neurauter J Yesinowski J Bozga M Learn A Scarbeary R Edwards L Rodriguez |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - LaSalle - IR 05000373/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2011Q1
Self-Identified List (LaSalle)
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