ENS 42242
ENS Event | |
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19:45 Jan 4, 2006 | |
Title | Unanalyzed Condition Related to Emergency Diesel Fuel Oil Tank Vortex Formation |
Event Description | At 1345, 1/4/06, Callaway Nuclear Plant completed a preliminary evaluation of the potential for vortex formation at the suction of the Emergency Diesel Generator fuel oil transfer pumps. This evaluation was performed in response to industry operating experience concerning an NRC finding identified during a utility inspection. The preliminary conclusion was that the existing Technical Specification level requirements for the Emergency Diesel Generator underground fuel oil storage tanks may be non-conservative and should be increased by an additional 489 gallons. This will result in a six day fuel oil volume requirement of 69,746 gallons and a seven day fuel oil volume requirement of 80,816 gallons.
A review of indicated fuel oil storage tank levels for the last three years was conducted and it was determined that there was sufficient fuel oil contained within the underground storage tanks to satisfy the new, higher volume requirements. In those instances where the volume would have been below the new requirements, this condition was already being tracked in the Callaway Plant Equipment Out of Service Log (EOSL) to satisfy associated Technical Specification requirements. It was conservatively decided to institute administrative controls utilizing plant procedural controls and establish new, elevated fuel oil tank level limits which will ensure vortex formation can not occur. Once the evaluation results are finalized, a review of all actions taken to date will be performed to ensure all required actions have been identified and appropriate measures taken to ensure compliance. The licensee notified the NRC Resident Inspector.
The evaluation discussed in the original notification has been completed. Administrative minimum limits for fuel oil level established to maintain compliance with the original Technical Specification Emergency Diesel Generator underground fuel oil volume requirements were in fact sufficient to ensure the prevention of vortex formation at the suction of the fuel oil transfer pumps. The fuel oil transfer subsystem remained capable of performing its safety function; therefore, there are no applicable reporting criteria under 50.72 or 50.73 and Event Notification 42242 is retracted. The licensee notified the NRC Resident Inspector. Notified R4DO (Graves). |
Where | |
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Callaway Missouri (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-1.27 h-0.0529 days <br />-0.00756 weeks <br />-0.00174 months <br />) | |
Opened: | Keith Duncan 18:29 Jan 4, 2006 |
NRC Officer: | Bill Huffman |
Last Updated: | Feb 16, 2006 |
42242 - NRC Website | |
Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 548062020-07-30T13:15:00030 July 2020 13:15:00
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