05000482/FIN-2008003-05
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Switchyard Work Proceudre Resulted in a Loss of Offsite Power |
| Description | A self-revealing finding was identified for an inadequate switchyard maintenance work instruction which resulted in the loss of offsite power. On April 7, 2008, while the plant was defueled for a refueling outage and safetyrelated 4 kV Bus NB01 was secured for maintenance, offsite power was lost to the safety-related 4 kV Bus NB02 when switchyard workers tripped the incorrect \"breaker failure\" trip relay while testing the Rose Hill 345kV offsite switchyard breakers. The work orders only provided generic instructions. The incorrect closed trip relay made up the logic for the startup transformer protection circuit and extended the trip signal to all 345kV offsite breakers, resulting in the loss of power. The licensee entered this issue into their corrective action program as Condition Report 2008-1457. This finding is greater than minor because it is associated with the equipment performance attribute of the mitigating systems cornerstone and affected the objective to ensure availability and reliability of systems that respond to initiating events to prevent undesirable consequences. Using the shutdown findings significance determination process, the finding was determined to be of very low safety significance because the finding did not increase the likelihood of a loss of reactor coolant system inventory, degrade the ability to terminate a leak path or add reactor coolant system inventory when needed during shutdown operations. This finding had human performance crosscutting aspects in the area of resources because the work instructions did not provide complete and accurate information to ensure safety H.2(c) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2008003 Section 4OA3 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | Finding: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | K Clayton P Elkmann L Ellershaw S Cochrum C Long V Gaddy |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
| ' | |
Finding - Wolf Creek - IR 05000482/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Wolf Creek) @ 2008Q2
Self-Identified List (Wolf Creek)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||