05000338/FIN-2013005-02
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Finding | |
|---|---|
| Title | Fuse Failures in 1H Emergency Diesel Generator Governor Circuit |
| Description | An unresolved issue (URI) was identified by the inspectors relating to an issue involving the licensees failure to establish and implement adequate PM for the 1H EDG control system fuse holders that were susceptible to relaxation of the spring clips. At 0005 on October 6, 2013, during the performance of 1-PT-83.7H, 1H EDG 24-Hour Run, the 1H EDG unexpectedly unloaded without warning or operator action and was tripped from the control room by the operators after 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> of operation. The 1H EDG is the Unit 1 Train A EDG that supplies emergency 4160V AC power to the Vital Electrical Distribution System Bus 1H. The 1J and 1H EDGs are the Unit 1 dedicated redundant power supplies of emergency 4160V AC power to the Vital Electrical Distribution System. At the time of the event 1J EDG was operable. The licensee entered this event in their corrective action program as CR528386 and initiated an apparent cause evaluation ACE19593, 1H-EDG Loss of Load During 24-hr Testing. The licensee stated in their ACE of the 1H EDG that the fatigue of the fuse clip most likely occurred from repeated insertion and removal of the fuses during the recent troubleshooting, maintenance, and the recent outage upgrade of the governor control system. The inspectors require additional information from the licensee to determine if there is a performance deficiency which is more than minor. This issue is identified as URI 05000338/2013005-02, Fuse Failures in 1H Emergency Diesel Generator Governor Circuit. |
| Site: | North Anna  |
|---|---|
| Report | IR 05000338/2013005 Section 4OA2 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Toth G Kolcum M Bates M King R Carrion R Claggd Bacong Kolcum J Laughlin J Reece K Miller M King R Clagg |
| INPO aspect | |
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Finding - North Anna - IR 05000338/2013005 | ||||||||||||||||||||||||||||||||||||||
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Finding List (North Anna) @ 2013Q4
Self-Identified List (North Anna)
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