ENS 40618
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ENS Event | |
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19:03 Mar 28, 2004 | |
Title | Both Emergency Diesel Generators Inoperable Due to Closed Fuel Oil Transfer Cross-Tie Valve |
Event Description | CNS was operating at 100% power in Mode 1 with Emergency Diesel Generator (EDG) #1 inoperable due to increased levels of particulates in the EDG Fuel Oil Storage Tank and supply piping. EDG #2 was determined to be operable with compensatory measures in place, including maintaining the two diesel fuel oil storage tanks tied together. With the crosstie valves open and the storage tank levels equalized, evaluation has shown that flow rates between the #2 EDG Fuel Oil Storage Tanks is low enough during EDG #2 operation to preclude excessive contamination of the EDG #2 Fuel Oil Storage Tank.
At 13:03 hours CST one of the two valves that cross-tie the two Emergency Diesel Generator Fuel Oil Storage Tanks together was found in the closed position, which was in conflict with the Operability Evaluation such that EDG #2 was determined to be inoperable. The valve was opened immediately and EDG #2 was declared operable. The cause of the event is under investigation. The NRC Resident Inspector has been notified of this event. |
Where | |
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Cooper Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+1.4 h0.0583 days <br />0.00833 weeks <br />0.00192 months <br />) | |
Opened: | Peter Donahue 20:27 Mar 28, 2004 |
NRC Officer: | Mike Ripley |
Last Updated: | Mar 28, 2004 |
40618 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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