05000416/FIN-2013002-07
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Finding | |
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| Title | Reactor Scram Due to Moisture in Isophase Bus Duct |
| Description | The inspectors reviewed a self-revealing finding for the failure to identify a degraded isophase bus duct view port window, which allowed water to intrude into the duct and caused an automatic reactor scram on January 14, 2013. The licensee took corrective action to stop the water intrusion into the isophase bus duct and to electrically isolate the spare transformer from the energized transformers. The licensee entered this issue into the corrective action program as Condition Report CR-GGN-2013-00319. The failure to identify a degraded isophase bus duct view port window is a performance deficiency. The finding is more than minor because it is associated with the Initiating Events Cornerstone attribute of human performance and adversely affected the associated cornerstone objective to limit the likelihood of those events that upset plant stability and that challenge critical safety functions during power operations. Using NRC Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, the inspectors determined that the issue affected the Initiating Events Cornerstone. In accordance with NRC Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings at Power, the inspectors determined that the issue has a very low safety significance (Green) because it caused only a reactor trip and did not cause a loss of mitigating equipment relied on to transition the plant from the onset of a trip to a stable shutdown condition. The finding has a cross-cutting aspect in the area of human performance associated with the decision-making component because the licensee did not use conservative assumptions in decision-making. |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2013002 Section 4OA3 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | B Rice D Proulx J Braisted J Laughlin R Smith S Achen S Hedger S Makor |
| INPO aspect | |
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Finding - Grand Gulf - IR 05000416/2013002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2013Q1
Self-Identified List (Grand Gulf)
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