Sr-90 level jumped up only 2 weeks after the performance test of multiple nuclide removing system

In order to purify the increasing contaminated water, Tepco is planning to install ALPS (Advanced Liquid Processing System).

The system is to remove 62 sorts of multiple radionuclides including Sr-90.

They started the performance test on 3/30/2013, however, Sr-90 already started being detected from the “purified” water.

The sample was taken on 4/12/2013, 2 weeks after the starting date of the test.

According to Tepco, 10,000Bq/m3 of Sr-90 was measured.

The previous test was conduced on 4/9/2013. The result was lower than 1,100 Bq/m3. The Sr-90 jumped up over 10 times after a certain time.

Tepco states the “purified” water will be discharged to the sea once they obtain the approval of the stakeholders.


Sr-90 level jumped up only 2 weeks after the operation of multiple nuclide removing system



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Français ;

Le niveau  en Sr 90 s’est multiplié par plus de 10 en 2 semaines après le début des tests de performance du système de filtrage multi-nucléides


Tepco a prévu d’installer le ALPS (Advanced Liquid Processing System) pour purifier les eaux contaminées qui augmentent.

Le système doit retirer 62 sortes de radionucléides multiples dont le Sr 90.
Ils ont commencé les tests de performance le 30 mars 2013, cependant le Sr 90 est déjà détecté dans les eaux “purifiées”.
L’échantillon a été pris le 12 avril 2013, 2 semaines après le début des tests.
Selon Tepco, ils ont relevé 10 000Bq/m³ de Sr-90.
Le test précédent était du 9 avril 2013. Son résultat était inférieur à 1 100 Bq/m³. Le Sr-90 a augmenté par plus de 10 fois au bout d’un certain temps.
Tepco affirme que l’eau “purifiée” sera déversée dans la mer une fois qu’ils auront l’accord des parties prenantes.

Sr-90 level jumped up only 2 weeks after the operation of multiple nuclide removing system

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About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


April 2013