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| Entered date | Event description | |
|---|---|---|
| ENS 52399 | 29 November 2016 06:19:00 | While operating in mode 1 at 100% rated thermal power an approximately 150 gallon oil spill occurred in the switchyard. Westar Energy personnel were performing corrective maintenance on the station's #6 transformer that required cleaning the oil. The #6 transformer was out of service at the time. The oil was being transferred to a group of hold up tanks. One of the tanks overflowed before the next tank could be placed in service. This resulted in the spill of approximately 150 gallons of UNIVOLT N 61 B, electrical insulating oil onto gravel and soil. The spill has been stopped. The oil had recently been sampled and there were no detectable polychlorinated biphenyls, PCBs. A clean up plan is being developed. Condition Report 00109759 has been generated. The acting NRC Senior Resident has been informed. The reportable quantity for the oil is 5 gallons. The licensee has notified the State of Kansas Department of Health and Environment and the National Response Center. |
| ENS 49423 | 9 October 2013 22:47:00 | A review of industry operating experience with respect to fire induced damage to unfused Direct Current (DC) ammeter circuits in the control room has determined that the condition described below is applicable to Wolf Creek Nuclear Generating Station. This condition results in an unanalyzed condition with respect to 10CFR50 Appendix R analysis requirements. The original plant wiring design did not include overcurrent protection features to limit the fault current in these circuits. The wiring design for the ammeters contains a shunt in the current flow from each NK direct current (DC) battery or charger. Two leads run from the shunt to a current meter in the main control room (MCR). These leads are tied to the positive polarity of the NK battery system. The ammeter wiring attached to the shunt is not overcurrent protected. It is postulated that a fire could cause one of these ammeter wires to short to ground at the same time the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This would cause a ground loop through the unfused ammeter cable. This event could result in excessive current flow (heating) in the ammeter wiring to the point of causing a secondary fire in the raceway system. The secondary fire could adversely affect safe shutdown equipment. Reference Palo Verde plant event #49411. A Breech Authorization with compensatory Control Room hourly fire watch for this issue is in place and will remain in effect until this deficiency is resolved. This condition has been discussed with the Resident Inspector. Similar Events #49422 and #49419 |