ENS 49025
ENS Event | |
|---|---|
22:43 May 12, 2013 | |
| Title | Unusual Event Due to Fire on Auxiliary Transformer Inside Protected the Area |
| Event Description | At 1743 CDT on 05/12/13, Grand Gulf Nuclear Station declared an Unusual Event due to a fire lasting greater than 15 minutes in an auxiliary transformer inside the Protected Area (PA). The transformer was isolated. The plant continues to operate at 100% power. The license remains in a Unusual Event pending further investigation.
The licensee notified the NRC Resident Inspector and State and Local Authorities. Notified DHS SWO, FEMA, and DHS NICC.
The Licensee terminated the Unusual Event at 1921 CDT on 5/12/13 based on electrically isolating the auxiliary transformer and termination of smoke coming from the transformer. At no time were flames seen during this event. The transformer is located outside of the turbine building and is used to supply various loads and office space during outages. There was no other impact on the plant. The licensee notified the NRC Resident Inspector and State and Local Authorities. Notified R4DO (Drake), NRR EO (Bahadur), IRD (Marshall), DHS SWO, FEMA, and DHS NICC.
EN#49025 documents an emergency declaration of Notification of Unusual Event due to a fire lasting greater than 15 minutes within the protected area. The basis for retraction is that this event did not meet the definition of FIRE in NEI 99-01 Rev 5, 'Methodology for the Development of Emergency Action Levels'. This document was endorsed by the NRC on February 22, 2008 (see ADAMS ascension # ML080450149) and is part of the Grand Gulf Nuclear Station's current licensing basis. Per the guidance, a FIRE is defined as: Combustion characterized by heat and light. Sources of smoke such as slipping drive belts or overheated electrical equipment do not constitute FIRES. Observation of flame is preferred but is NOT required if large quantities of smoke and heat are observed. Grand Gulf performed interviews of operators and personnel responding to the event and subsequently examined photos of the affected auxiliary transformer. According to eyewitness reports from personnel, flames were not observed at any time nor was there any light emanating from the source of smoke. Personnel also reported that at the immediate vicinity of the smoke source, heat was not at a level which would be indicative of a fire. Photos of the affected transformer did not show signs of charring, burns, warping, or deformation as would be expected during a FIRE. Additionally, the definition of a FIRE specifically excludes overheated electrical equipment. Notified R4DO (Azua), NRR EO (Chernoff), and IRD (Morris). |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.47 h-0.145 days <br />-0.0207 weeks <br />-0.00475 months <br />) | |
| Opened: | Tj Reynolds 19:15 May 12, 2013 |
| NRC Officer: | John Shoemaker |
| Last Updated: | May 29, 2013 |
| 49025 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 550562021-01-07T07:24:0007 January 2021 07:24:00
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