05000454/FIN-2009002-01
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Finding | |
|---|---|
| Title | Failure to Perform an Adequate Risk Assessment that Accounted for All Risk Significant Structures, Systems and components that were Unavailable Prior to Maintenance Activities. |
| Description | A finding of very low safety significance and associated NCV of 10 CFR 50.65(a)(4) was identified by the inspectors for the licensees failure to perform a risk assessment that accounted for the inability of the Unit 1 Essential Service Water suction valve 1SX001A to close before performing maintenance. The finding was more than minor because it was similar to NRC IMC 0612, Appendix E, Examples of Minor Issues, Example 7e, in that the elevated overall plant risk, when correctly assessed, would have required additional risk management actions. This finding had the potential to become a more significant event if the suction valve was required to mitigate flooding in the auxiliary building. The finding was determined to be of very low safety significance since the Incremental Core Damage Probability (ICDP) was calculated to be 9.44E-7 given that the condition existed for 14 days. The primary cause of this finding was related to the cross-cutting area of Human Performance for Resources (H.2(c)) because Valve 1SX001A was not added to the Paragon risk assessment computer program to allow the user to make effective risk assessments. The licensee entered this issue into their correction action program as Issue Report (IR) 889131 and performed a risk assessment for the condition |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2009002 Section 1R13 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | R Skokowski C Tilton J Dalzell M Holmberg R Ng C Thompson B Bartlett J Robbins J Cassidy R Jones |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Byron - IR 05000454/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2009Q1
Self-Identified List (Byron)
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