8 janvier 2015
La concentration du rejet en tritium aurait été de 7,52 millions de picocuries par litre et aucun autre radioélément n’aurait été détecté. Selon Associated Press, la quantité du rejet oscillerait entre 380 et 760 litres (*). La fuite a été isolée 45 minutes après son repérage.
Type : Fukushima 1 (BWR Mark I) - Puissance : 3458 MWth - Première divergence n° 1 : 08/1973 ; n° 2 : 07/1974 ; n° 3 : 08/1976
Available in english only.
Event Number : 50725
Facility : BROWNS FERRY - State : AL
Unit : [1] [2] [3] - RX Type : [1] GE-4,[2] GE-4,[3] GE-4
Event Date : 01/08/2015 - Event Time : 16:26
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Initial PWR Current PWR
1 N Y 100 % Power Operation 100 % Power Operation 2 N Y 100 % Power Operation 100 % Power Operation 3 N Y 100 % Power Operation 100 % Power Operation
Event Text
OFFSITE NOTIFICATION DUE TO LOW LEVEL TRITIUM SPILL
"On January 7, 2015, at approximately 0700 CST, a leak to the environment was identified. Tritium was present at a concentration of 7.52E-3 uCi/mL, which is above the US Environmental Protection Agency (EPA) drinking water standard of 20,000 picocuries per liter. No other radioactive isotopes were identified. The leak rate was estimated at approximately 0.5 gpm and determined to be from the condensate head tank. Water was accumulating on the concrete-lined reactor/refuel air zone air intake plenum with some accumulation of water on the ground in the area. The intake plenum contains three floor drains. Actions were immediately taken to terminate the leak once the flowpath was identified. The flowpath was terminated two hours and 45 minutes after identification. Based on system review and analysis, any tritiated water that would have made it to the floor drains would then be mixed with incoming raw water at two million gallons per minute. This mixed volume of water would then be circulated through the plant and discharged to the river with a resultant tritium concentration that is much less than detectable levels and well below US EPA drinking water standards. The station has established increased monitoring of groundwater at designated sample wells.
On January 8, 2015, at approximately 1645 CST in accordance with TVA procedures and the guidance of NEI 07-07 [Nuclear Energy Institute] for the Groundwater Protection Initiative, the licensee notified the Alabama Radiological Protection Department and Alabama Department of Environmental Management. The Limestone County Emergency Management Department will be notified."
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150109en.html#en50725
(*)___________
BROWNS FERRY NUCLEAR PLANT. ARCHIVED PHOTO-BROWNS FERRY NUCLEAR PLANT. (Non Staff)
The Associated Press By The Associated Press on January 12, 2015 at 10:02 AM
A newspaper reports that radioactive water leaked from a tank at an Alabama nuclear plant, releasing tritium into the environment.
The Chattanooga Times Free Press reports that the leak occurred last week at the Browns Ferry Nuclear Power Plant near Athens.
A spokesman for the Tennessee Valley Authority, which operates the plant, said the leak was quickly contained and presented no public risk.
The TVA said a drain line leaked 100 to 200 gallons of water containing tritium levels above acceptable drinking water standards.
In a report to the Nuclear Regulatory Commission, the TVA said it increased monitoring of water around the plant but hasn’t detected elevated tritium levels outside the plant.
Tritium is a radioactive form of hydrogen that occurs in nature and also as a byproduct of nuclear fission.
https://www.al.com/news/index.ssf/2015/01/leak_at_browns_ferry_nuclear_p.html
La boutique
Informez vous