Tepco is going to discharge contaminated water to the sea, however, they would take over 56 years to discharge all tritium to the sea according to Tepco.
The tritium is contained in the contaminated water.
This is on the assumption that the retained water does never increase even by 1cc for the rest of time, and that they discharge tritium to the sea at the highest level everyday under the safety regulation.
The retained water contains 1 ~ 5 million Bq/L of tritium. (Tepco commented it is actually 5 million Bq/L.)
The volume of the whole retained water is 245,000,000 L.
The safety limit of tritium to discharge is 22,000,000,000,000 Bq/y.
Related article..Tepco started propaganda to downplay the risk of Tritium for discharging contaminated water to the sea [URL]
http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2013/images/handouts_130228_04-e.pdf
Ultra thanks→ http://kinoryu.cocolog-nifty.com/go_kinoryu/2013/03/post-4483.html
Iori Mochizuki
_____
Français :
Dans l’hypothèse la plus optimiste, Tepco va mettre plus de 56 ans pour déverser tout le tritium en mer
Tepco va déverser l’eau contaminée dans la mer, toutefois, selon Tepco, déverser tout le tritium dans la mer devrait leur prendre plus de 56 ans.
Le tritium est dans l’eau contaminée.
Ceci dans l’hypothèse que le volume d’eaux stockées n’augmentera plus jamais, même de 1 cm³ et qu’ils déversent tous les jours le tritium dans la mer au plus haut niveau autorisé par les règles de sécurité.
Les eaux retenues contiennent de 1 à 5 millions de Bq/L de tritium. (Tepco dit qu’en fait c’est à 5 millions Bq/L.)
Le volume total des eaux stockées est de 245 000 000 L. (ndt : 245 millions de litres)
La limite de sécurité pour le tritium déversé est de 22 000 000 000 000 Bq/an. (ndt : 22 millions de millions)
(ndt : 245 millions * 5 millions = 1 225 millions de millions => 1225/22 = 55,68 ans si h24 7/7j , donc >56 ans en réalité)
http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2013/images/handouts_130228_04-e.pdf
Un immense merci à http://kinoryu.cocolog-nifty.com/go_kinoryu/2013/03/post-4483.html
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Can anyone give the probability and extent of contamination and rate of bioaccumulation?
if you look at the Bq/Year number and divide by the seconds per year, they claim the safety limit of discharge
is 7 million Bq/second?
Is that possibly right?
Would that be a discharge for the entire solute?
now the half life is 12 years, so if they can store it in tanks for 100 years it will mostly breakdown, and the good part is it’s a Beta emitter, which is a high energy electron, so it’s not too dangerous to shield.
It may just be best to find a underground salt dome, and pump it down, if the dome holds integrity for
a century, that will work.
They could extract the tritium then paint all their roads and hiways with it so they can save the power normally used for street lighting.