7 mai 2014
La contamination de la nappe serait supérieure à 44 000 Bq en tritium mais ne justifiait pas une déclaration, selon la NRC : selon "US Environmental Protection Agency", la norme pour le tritium dans l’eau potable est de 20 000 pcie/l (740 Bq/l). A noter qu’aucun autre radioélément rejeté dans l’environnement n’est mentionné par la NRC alors que l’eau déversée dans la nappe était contaminée.
Type : PWR - Puissance : 3 x 2 658 MWth - Première divergence : 04/73 - 11/73 - 09/74
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n° : 50093 - Facility : OCONEE - State : SC - Unit :    RX Type :  B&W-L-LP, B&W-L-LP, B&W-L-LP
Event Date : 05/07/2014 - Event Time : 14:50
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(xi) - OFFSITE NOTIFICATION
1 N Y 100 Power Operation 100 Power Operation 2 N Y 100 Power Operation 100 Power Operation 3 N N 0 Refueling 0 Refueling
VOLUNTARY NOTIFICATION TO OFFSITE GOVERNMENT AGENCIES DUE TO LEAK OF WATER CONTAINING LOW LEVEL TRITIUM CONCENTRATION IN ACCORDANCE WITH NEI INITIATIVE 07-07
"A leak containing a low level tritium concentration assumed to be greater than 100 gallons of water, with the potential to reach groundwater, occurred at Oconee Nuclear Station. A water sample indicated that the tritium level was 3150 picocuries per liter ; which is less than a quarter of the US Environmental Protection Agency drinking water standard of 20,000 picocuries per liter for tritium.
"While conducting a transfer from one chemical treatment pond to another, water was observed seeping from the ground at a location near the transfer piping between the ponds. The transfer was terminated and the ground seepage subsided. Actions have been taken to prevent further use of the chemical treatment pond discharge path at this time. Based upon the on-site location and low tritium levels, there is no health or safety impact to the public or employees.
"Voluntary notification of state and local agencies is being made via the industry groundwater protection initiative ; measured tritium levels were below any required notification threshold."
Agencies notified : South Carolina Department of Health and Environmental Control, South Carolina Emergency Management, City of Seneca, City of Anderson, Greenville Water System, Oconee County Administration, Pickens County Administration, Anderson County Administration, Oconee County Emergency Management, Pickens County Emergency Management, Greenville County Emergency Management, and Clemson University Utility Services.