05000244/FIN-2010004-01
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Finding | |
|---|---|
| Title | Failure to Adequately Assess the Risk of Technical Support Center Inverter Maintenance |
| Description | The inspectors identified a very low safety significance (Green) non-cited violation (NCV) of 10 CFR 50.65, Maintenance Rule, paragraph (a)(4), when Ginna did not perform an accurate risk assessment prior to removing the technical support center (TSC) battery charger and fire system S01, suppression for the auxiliary building basement cable trays, from service, which resulted in an underestimation and lack of awareness of the risk during these maintenance activities. Ginna\'s corrective actions included immediately updating their risk model to reflect the actual plant configuration. When re-evaluated, the core damage frequency (CDF) risk, during the maintenance, increased from low to medium. The finding is more than minor because if the overall risk had been correctly assessed, it would have placed Ginna into a higher risk category. The finding is associated with the configuration control attribute of the Mitigating Systems cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined that the finding is of very low safety significance because the incremental core damage probability deficit was less than 1.0E-6. This finding has a cross-cutting aspect in the area of human performance, work control, in that Ginna operators were not fully apprised of the work status of the TSC inverter work and its operational impact (H.3.b per IMC 0310). |
| Site: | Ginna  |
|---|---|
| Report | IR 05000244/2010004 Section 1R13 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | S Pindale G Hunegs K Young F Arner G Dentel N Perry R Rolph L Casey |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Ginna - IR 05000244/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Ginna) @ 2010Q3
Self-Identified List (Ginna)
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