05000346/FIN-2013004-03
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Finding | |
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| Title | RCP Trip, RPS Actuation and Reactor Trip Results from the Installation of a RCP Motor Repair Part Not Suitable for the Application |
| Description | A self-revealed finding of very low safety significance was identified for the licensees failure to procure and install appropriate replacement parts for repair of the Reactor Coolant Pump (RCP) 1-2 motor during the 2010 refueling outage. Specifically, a degraded terminal strip in the motor\'s current transformer (CT) circuit was replaced with a new terminal strip that had substandard fasteners. The licensee\'s procurement process did not have any provisions in place to ensure the fasteners (screws) were of the appropriate quality for the application, and some of the screws ultimately failed due to vibration induced fatigue causing a reactor trip when the RCP tripped due to an electrical fault. No corresponding violation of NRC requirements was identified. The finding was determined to be of more than minor significance because it was associated with cornerstone attribute of design control and adversely affected the cornerstone objective: To limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The finding was determined to be of very low safety significance (Green) because it resulted in a reactor trip without any corresponding loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition, and there were no other abnormal events such as fire, flooding, or high energy line breaks (HELBs). The finding had a cross-cutting aspect in the area of human performance, resources component, because the licensee had failed to ensure that the replacement terminal strip, which ultimately was cause of the reactor trip, was adequate for its service environment. |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2013004 Section 4OA3 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Dunlop J Neurauter P Pelke D Kimble T Briley J Steffes |
| CCA | H.1, Resources |
| INPO aspect | LA.1 |
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Finding - Davis Besse - IR 05000346/2013004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2013Q3
Self-Identified List (Davis Besse)
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