05000458/FIN-2008003-02
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Finding | |
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| Title | Inadequate Risk Assessment While Troubleshooting Results in Unanticipated Reactor Power Oscillations |
| Description | The inspectors identified a noncited violation of 10 CFR 50.65(a)(4) when operators failed to perform an adequate risk assessment associated with a reactor start-up while performing troubleshooting, and during maintenance activities on the main turbine electro hydraulic control system. This resulted in unanticipated oscillations in reactor power and pressure. The licensee entered this issue into their corrective action program as Condition Report RBS-2008-4284. Using NRC Manual Chapter 0612, Appendix E, Section 3, Item 7(e), this finding is more than minor because Entergys risk assessment had errors and incorrect assumptions that put the plant in a higher risk category. The risk assessment also failed to consider emergent maintenance activities that could increase the likelihood of initiating events. Using Manual Chapter 0609, Significance Determination Process, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, the finding is determined to have very low safety significance (Green) because the incremental core damage probability deficit for the affected time period is less than 1.0E-6. This finding has a crosscutting aspect in the area of human performance component of decision making because the licensee did not use conservative assumptions in decision making and adopt a requirement to demonstrate the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disapprove the action H.1(b) (Section 1R13) |
| Site: | River Bend  |
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| Report | IR 05000458/2008003 Section 1R13 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | P Goldberg B Baca P Elkmann G Miller B Tindell G Larkin C Norton |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - River Bend - IR 05000458/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2008Q2
Self-Identified List (River Bend)
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