INES-event
INES 0

Fire in emergency diesel generator control panel during test

On 8 October, 1998, with the unit in day 33 of a refueling outage, an ALERT emergency classification was declared due to an electrical fire in the local control panel for the #12 emergency diesel generator (EDG). At the time of fire, the licensee was performing a 24 hour surveillance test of EDG following a major overhaul of the diesel engine. The local EDG operator noticed heavy smoke coming from the control panel and tripped the EDG and opened its output breaker before leaving the area. When site personnel wearing self contained breathing apparatuses arrived in the area several minutes later they found smoke but no flames. The ALERT was terminated shortly thereafter. The licensee determined that the smoke had come from a current limiting transformer for the generator exciter field.
Justification of the rating. This event is rated as level 0/below scale in accordance with Table 1 of the INES Users Manual as an event without initiator and with safety function availability within operational limits and conditions. Although the safety function "cooling of the fuel" was negatively impacted by the event, the EDG had previously been removed from service for the overhaul and the unit was in compliance with the plant Technical Specifications. In addition, had this event occurred while the until was operating, continued operation for a limited time with one inoperable EDG is within the scope of the plant Technical Specifications. This plant has a total of four EDGs.

Location: ENRICO FERMI-2
Event date: Thu, 08-10-1998
Nuclear event report
Legenda & explanation