Nitrogen injection stopped and Tepco started backup unit


Nitrogen injection was stopped for reactor 1, 2, 3, 10:55 4/4/2012, a plant worker reported.
At 0:16 4/4/2012, backup unit was started, at 0:30, nitrogen injection was restarted.
The reason why it stopped is now known.

Tepco still needs to inject nitrogen to each reactor to control hydrogen concentration.
If nitrogen injection stops for 30 hours, hydrogen concentration goes up to 4%, which may cause hydrogen explosion.

In case of reactor1, 23m2/h is injected to container vessel, 15.3m2/h is injected to pressure vessel, at the moment of 5:00 4/4/2012.

Control units are separated for each reactor, it can be assumed that the shared nitrogen generator had a trouble for some reason.

Nitrogen injection stopped and Tepco started backup unit


Source 2

時事通信 4月4日(水)12時21分配信




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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 2012