North Anna Nuclear Power Plant Bearing Cooling Water Found Discharging into Lake

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Power Reactor Event Number: 47345
Facility: NORTH ANNA
Region: 2 State: VA
Unit: [1] [2] [ ]
RX Type: [1] W-3-LP,[2] W-3-LP
Notification Date: 10/14/2011
Notification Time: 15:30 [ET]
Event Date: 10/14/2011
Event Time: 14:40 [EDT]
Last Update Date: 10/14/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) – OFFSITE NOTIFICATION
Person (Organization):


Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N N 0 Cold Shutdown 0 Cold Shutdown
2 N N 0 Cold Shutdown 0 Cold Shutdown

Event Text


“On 10/14/2011 at 0322 [EDT], Operations identified during operator rounds that the bearing cooling tower basin was overflowing. Earlier in the night the control room had received a bearing cooling basin high level alarm, verified that the bearing cooling tower basin was not overflowing and was monitoring the level from control room indications. The Control Room indications of bearing cooling basin level had remained steady. The overflow condition was due to leak by from a motor operated valve (MOV) which had been used earlier to add water to the bearing cooling basin. The leaking MOV was manually torqued shut which isolated the overflow discharge. Investigation of the inaccurate level indication is ongoing.

“Samples of the bearing cooling water were analyzed by Chemistry. All chemical parameters analyzed were within VPDES (Virginia Pollutant Discharge Elimination System) limits. Bearing Cooling chemistry is maintained to ensure compliance with the North Anna VPDES permit. It is estimated that 272 gallons may have been discharged to the lake.

“At 1440 hours on October 14, 2011, a 24-hour notification of the unusual discharge was made to the Virginia Department of Environmental Quality In accordance with the North Anna VPDES permit.

“This issue is being reported per 10CFR50.72(b)(2)(xi) as an event where notification of other government agencies has been made.”

The licensee informed the NRC Resident Inspector.

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