05000445/FIN-2014004-04
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Finding | |
|---|---|
| Title | Failure to Install an Insulated Bushing on a Generator Current Transformer Circuit Results in an Automatic Reactor Trip |
| Description | The inspectors reviewed a self-revealing finding for the licensees failure to follow an electrical installation specification and install an insulated bushing on the end of a flexible conduit. As a result, a generator current transformer conductor shorted to ground causing a generator trip and ultimately an automatic reactor trip. The licensee repaired the conductor and returned the unit to service. The licensee entered the finding into the corrective action program as Condition Report CR-2014-000579. The failure to follow an electrical installation specification and install an insulated bushing on the end of a flexible conduit was a performance deficiency. The performance deficiency was more than minor because it was associated with the human performance attribute of the Initiating Events cornerstone 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. Using Inspection Manual Chapter 0609, Attachment 04, Initial Characterization of Findings, and Appendix A, Exhibit 1, Initiating Event Screening Questions, the finding was determined to be of very low safety significance (Green) because although the finding caused a reactor trip, it did not involve the loss of mitigation equipment. The inspectors determined that the finding was not representative of current licensee performance and no cross-cutting aspect was assigned. |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2014004 Section 4OA3 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Kumana W Walker G Guerra J Kramer J Melfi M Wilk |
| INPO aspect | |
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Finding - Comanche Peak - IR 05000445/2014004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2014Q3
Self-Identified List (Comanche Peak)
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