Stichting Laka

Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Tue, 28-05-1996
ERF description: On April 4, 1996, Palo Verde 2 experienced fires in two separate areas as a result of a single initiating event. Specifically, a fault in an improperly grounded essential lighting system isolation transformer caused fires in the control room and the Train"B" DC equipment room The first fire involved the essential lighting distribution panel and the control room emergency lighting uninterruptible power supply located in the control room on elevation 140-0. This fire created a smoke condition in the main control room behind the main control boards. The smoke layer extended down from the ceiling to a level just above the tops of the control boards. The smoke did not cause a control room evacuation. The licensee used the control room HVAC system in its smoke removal mode to clear the control room. The second fire involved the isolation transformer panel located in the Train "B" DC equipment room on control building elevation 100-0. Both fires were detected by the plant fire detection system and plant personnel in the control room. The site fire department promptly responded and extinguished these fires.
Justification: Using the guidance in paragraph III-2.10 this event is rated at level zero/below scale. Paragraph III-2.10 refers to Table II in Part III of the INES user's manual. The rating is obtained by entering the table in the row for Full safety function availability (cooling the radioactive material). This safety function remained "fully" available throughout this event. Since the hazard itself (the fire) is not considered an initiator, a rating of level zero is appropriate. The plant was in a refueling outage at the time of this event and all but one fuel assembly had been removed from the core. This rating is confirmed by the guidance contained in section III-3.1.1 (degradation of reactor core cooling) and section III-3.1.2 (events affecting the spent fuel pool) since neither core cooling nor spent fuel pool cooling was lost.
ERF rating date: 29-04-1996
ERF contact person: R.J. BARRETT
ERF address: United States
ERF affiliation: USNRC, EMERGENCY RESPONSE BRANCH, OFFICE FOR ANALYSIS AND EVALU

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