ENS 41104
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ENS Event | |
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17:55 Oct 8, 2004 | |
Title | Unusual Event Due to Actuation of Carbon Dioxide Fire Suppression System in Turbine Building |
Event Description | The licensee experienced an apparently spurious actuation of the CO2 (carbon dioxide) suppression system in the North Anna Unit 1 turbine building (specifically the main turbine, low pressure turbine, and exciter area). The licensee responded and determined there was no fire and secured the CO2 release within two minutes. The event was classified as an unusual event per item K.13 of the emergency action levels due to onsite release of a toxic gas.
The licensee has pulled the actuation fuses on the system, isolated the CO2 storage tank, and is in the process of ventilating the area. A fire watch has been posted and the licensee is checking CO2 levels throughout the area. There were no injuries as a result of the discharge and no significant operational impairment. The licensee has notified appropriate state and local authorities as required due to the declaration of an unusual event. The licensee will also notify the NRC resident inspector.
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Where | |
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North Anna ![]() Virginia (NRC Region 2) | |
Reporting | |
Emergency class: | Unusual Event |
10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
Time - Person (Reporting Time:+-3.68 h-0.153 days <br />-0.0219 weeks <br />-0.00504 months <br />) | |
Opened: | Dave Nunberg 14:14 Oct 8, 2004 |
NRC Officer: | Bill Huffman |
Last Updated: | Oct 8, 2004 |
41104 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (74 %) |
After | Power Operation (74 %) |
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