05000482/FIN-2009003-02
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Finding | |
|---|---|
| Title | Inadequate Fuse Thermography Procedure Resulted in Blown Fuses and Unplanned Reactor Trip |
| Description | A self-revealing finding was identified for an inadequate thermography maintenance procedure that resulted in a reactor trip due to a loss of power to a main feed regulating valve controller. On April 28, 2009, the main feedwater regulating valve controller power supply fuses blew, isolating flow to steam Generator B. The fuses blew due to overheating of the fuse holder. Wolf Creeks root cause found that vendor information was previously used in 1995 to detect a process cabinet main power fuse holder that was hot. However, this guidance was not incorporated into the preventive maintenance thermography procedure. This issue was entered into the corrective action program as Condition Report 00016455.Failure to develop an adequate maintenance procedure for the 7300 process rack fuses was a performance deficiency. The inspectors determined that this finding was more than minor because it is associated with the procedure quality attribute of the Initiating Events cornerstone and it affected the cornerstone objective to limit the likelihood of those events that upset plant stability. The inspectors evaluated the significance of this finding using Inspection Manual Chapter 0609.04, and determined the finding to be Green because it did not result in both a reactor trip and loss of accident mitigation equipment. Consequently, this finding was determined to be of very low safety significance (Green). The inspectors also determined that the cause of the finding had a crosscutting aspect in the problem identification and resolution area associated with operating experience because Wolf Creek failed to use vendor information to assure plant safety. Specifically Wolf Creek utilized but failed to subsequently institutionalize operating experience in 1995 and 2009 by updating the thermography maintenance procedure |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2009003 Section 4OA3 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | G Guerra B Tharakan B Tindell C Long V Gaddy C Peabody P Jayroe |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Wolf Creek - IR 05000482/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q2
Self-Identified List (Wolf Creek)
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