ENS 47682

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v t e ENS Event
18:45 Feb 21, 2012
Title	Tritium Identified Onsite Above the Voluntary Reporting Threshold
Event Description	On February 17, 2012, North Anna Power Station (NAPS) was notified by its vendor laboratory that a water sample, taken from an onsite ground water sample point, was confirmed to contain tritium above the voluntary reporting threshold of 20,000 picocuries per liter(pCi/L). The water sample, measuring 53,300 pCi/L, was obtained as a part of ongoing activities to determine the source of tritium previously reported to the state and NRC on October 29, 2010 (Event Notification - 46377). Current hydrological studies have determined the ground water in the area migrates to the station power block which is in the opposite direction from the lake. The ground water at the power block is collected in building subsurface drains and transported to a clarifier for processing. Clarifier discharge is accounted for as a monitored liquid effluent release pathway under the radiological effluent control program in accordance with the station's Offsite Dose Calculation Manual. As such, there is no increase to the projected annual dose to a member of the public. There are also no sources of drinking water in this area. Sampling of eight (8) ground water sample points outside the station protected area show no detectable levels of tritium confirming there is no migration offsite. The NRC Resident Inspector has been notified. A 30 day written report will be submitted to the NRC in accordance with NEI 07-07, Industry Ground Water Protection Initiative - Final Guidance Document. The licensee will inform both state and local agencies.

ENS 47682 +/-
Where
North Anna Virginia (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
Time - Person (Reporting Time:+-4.8 h-0.2 days <br />-0.0286 weeks <br />-0.00658 months <br />)
Opened:	Don Taylor 13:57 Feb 21, 2012
NRC Officer:	Pete Snyder
Last Updated:	Feb 21, 2012
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v • d • e

v t e Emergency Notification System
North Anna with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
WEEKMONTHYEAR2023-09-18T18:20:00 [Table view]
[ENS list for North Anna]

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