05000280/FIN-2009005-02
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Finding | |
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| Title | Failure to perform an adequate operability determination for main control room isolation damper 1-VS-MOD-103D |
| Description | A self-revealing Green Finding was identified for the incorrect operability determination of main control room isolation damper 1-VS-MOD-103D. The damper, declared operable and left in-service following loss of power to its hydraulic pump on September 21, 2009 (CR 349003), failed to close on demand, on September 22, 2009. The damper was inoperable for approximately 19 hours2.199074e-4 days <br />0.00528 hours <br />3.141534e-5 weeks <br />7.2295e-6 months <br /> (CR 349075) before power was restored to the pump, the damper closed, and the actuator repaired. The finding, associated with the performance attribute of the barrier integrity cornerstone, is more than minor because it adversely affected the cornerstone objective as it relates to control room integrity, to provide reasonable assurance physical design barriers protect public health and safety. The finding, evaluated perMC-0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings, was determined to be of very low safety significance (Green) because it did not result in a loss of safety function or the loss of a singe train of the control room isolation boundary for more than its allowed outage time. This finding has a cross-cutting aspect in the area of problem identification, corrective action program, in that an adequate operability assessment that thoroughly evaluated the degraded condition of 1-VS-MOD-103D was not performed (P.1.c) |
| Site: | Surry  |
|---|---|
| Report | IR 05000280/2009005 Section 1R15 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | Finding: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | C Fletcher R Williams R Hamilton W Loo J Nadel A Vargas -Mendez C Welch G Mcco |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Surry - IR 05000280/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Surry) @ 2009Q4
Self-Identified List (Surry)
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