05000286/FIN-2008002-01
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Finding | |
|---|---|
| Title | Failure to Include Amsac Into Online Risk Assessments |
| Description | The inspectors identified a Green non-cited violation (NCV) of Title 10 of the Code of Federal Regulations (CFR) Part 50.65(a)(4), because Entergy did not assess and manage the increase in risk from maintenance activities prior to performing work on the Unit 3 plant computer static inverter that required the Anticipated Transient Without Scram (ATWS) Mitigating Safety Actuating Circuitry (AMSAC) to be bypassed. When questioned by the inspectors, operations personnel included AMSAC unavailability in the risk calculation and observed an increase in the calculated risk. Entergy entered the issue into their corrective action program for evaluation. The inspectors determined that this finding was more than minor because Entergy failed to include an unavailable, risk-significant system (AMSAC) in the plant on-line risk assessment during maintenance on the Unit 3 plant computer static inverter. In accordance with Inspection Manual Chapter (IMC) 0609, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, the inspectors determined that this finding was of very low safety significance because the difference between the correctly calculated core damage frequency (CDF) and Entergys original calculation was less than 1E-6. The inspectors determined that this finding had a crosscutting aspect in the area of Human Performance because Entergy did not appropriately plan work activities by incorporating appropriate risk insights for affected plant equipment. (H.3(a) |
| Site: | Indian Point  |
|---|---|
| Report | IR 05000286/2008002 Section 1R13 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | A Koonce E Cobey P Cataldo S Barr |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Indian Point - IR 05000286/2008002 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2008Q1
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