05000335/FIN-2009003-01
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Finding | |
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| Title | Inadequate Risk Assessment When Performing Weekly Pump Venting |
| Description | The inspectors identified NCV of 10 CFR 50.65 (a)(4) when the licensee did not perform an adequate risk assessment which resulted in an underestimation of the associated risk while performing weekly Emergency Core Cooling System (ECCS)pump venting. On April 20, 2009, the inspectors were reviewing the Unit 2 control room chronological logs and noted that during the weekly High Pressure Safety Injection (HPSI) pump venting, the assessed risk using the Online Risk Monitor(OLRM) was recorded as green (low) instead of the required yellow (medium).During the venting evolution, the HPSI pump hand switch is taken to STOP rendering the pump incapable of performing its safety-related function to automatically inject water into the RCS, thereby requiring entry into the associated TS Action Statement and yellow OLRM risk determination. The issue was entered in the licensees corrective action program as CR 2009-12037.The finding was more than minor because it affected the Human Performance attribute of the Mitigating Systems cornerstone and using MC 0612, Appendix E, Example 7.e, because if the overall risk had been correctly assessed, it would have placed both units into a higher risk category. The finding was evaluated in accordance with MC 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process (SDP), and determined to be of very low safety significance (Green), using Flowchart 1. This determination was based on the incremental core damage probability deficit being less than 1E-6 for the given condition of the HPSI pumps being out of service during the weekly pump venting. This finding has a crosscutting aspect in the area of human performance, component of work control because the licensee did not incorporate appropriate risk insights when planning maintenance that effects the OLRM value. |
| Site: | Saint Lucie  |
|---|---|
| Report | IR 05000335/2009003 Section 1R13 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | A Nielsen G Kuzo L Lake R Aiello T Hoeg S Sanchez B Collins M Sykes D Forbes |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Saint Lucie - IR 05000335/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Saint Lucie) @ 2009Q2
Self-Identified List (Saint Lucie)
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