ENS 44822
ENS Event | |
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02:56 Feb 2, 2009 | |
Title | Unusual Event and Reactor Scram Due to Main Transformer Fire |
Event Description | At 2156 EST, a fire occurred on Main Transformer M1A. The loss of the main transformer resulted in a reactor scram from full power without complications. The transformer deluge system activated. The fire brigade responded and offsite assistance from the fire department was obtained to help extinguish the fire. The fire department has since departed the site. An Unusual Event was declared at 2211 EST based on the transformer fire lasting longer than 15 minutes. The fire was extinguished at 2227 EST. A fire reflash watch was established. There was no damage to any other equipment besides the main transformer.
During the reactor scram transient, the isolation condenser actuated as expected and was subsequently secured. Four electro-magnetic relief valves actuated and reseated normally. The plant is currently in hot standby with reactor pressure at 927 psi and water level at 150 inches with all conditions stable and a normal electrical configuration. The licensee is assessing the criteria for exiting the UE at this time. The licensee has notified State and local government agencies and the NRC Resident Inspector.
The licensee terminated the UE at 2337 EST due to stable plant conditions with all entry criteria for the UE exited and no concern of reflash. The licensee did note that there is an oil sheen on the water around the transformer and indication of a small amount of oil dripping from the transformer. The licensee is taking efforts to contain the spill with spill kits and barriers. The NRC Resident has been notified. Notified R1DO (Schmidt), R1 (Bellamy), NRR EO (Blount), and IRD (McMurtray). Informed DHS (Banner) and FEMA (Barden).
Upon review of the electromagnetic relief valve performance during the reactor scram at 2156 EST on 2/1/09, two electromagnetic relief valves opened - not four (as originally reported). Due to subsequent seat leakage of one electromagnetic relief valve, the valve was cycled and was able to be reseated. At 0444 EST on 2/2/09 downstream relief temperatures confirmed that the valve had reseated. The licensee has notified the NRC Resident Inspector. R1DO (Schmidt) notified. |
Where | |
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Oyster Creek New Jersey (NRC Region 1) | |
Reporting | |
Emergency class: | Unusual Event |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
Time - Person (Reporting Time:+-3.85 h-0.16 days <br />-0.0229 weeks <br />-0.00527 months <br />) | |
Opened: | Andrew Zuchowski 23:05 Feb 1, 2009 |
NRC Officer: | Bill Huffman |
Last Updated: | Feb 2, 2009 |
44822 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | A/R |
Before | Power Operation (100 %) |
After | Hot Shutdown (0 %) |
Oyster Creek with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 531532018-01-06T10:24:0006 January 2018 10:24:00
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