Updates on Fukushima

- Since TEPCO suspected hydrogen gas accumulation in the Primary containment vessel, they open a valve and injected Nitrogen gas to unit 1.

- Started transfer of highly radioactive water from the turbine building of unit 3.

- On May 17th started to spray water to unit 4 spent fuel pools and injected hydrazine (corrosion inhibitor) at the same time.

- On May 18, started to spray the spent fuel pool of unit 2 and injected hydrazine as well.

- On may 18, removed approximately 10.5 m3 of contaminated water from the basement of unit 6.

Corrosion was expected because at first sea water was used to cool the reactors and the spent fuel pools. Hydrazine is a highly poisonous substance.

This map shows radiation levels around Fukushima