Release of radiation in the accident at the Fukushima-1 underestimated twice

 

Agency for Nuclear and Industrial Safety of Japan (NISA) on Tuesday, June 7, announced the results of the examination, according to which the amount of radioactive material released into the atmosphere in the first days after a series of accidents at the nuclear power plant "Fukushima-1", was two times greater than previously thought. This is the agency "Kyodo".

Thus, in the first days of the crisis on the "Fukushima-1" release of radioactive substances into the atmosphere up to 770,000 terabecquerels. During the examination, it was found in particular that stood out from the second reactor is more hazardous than previously thought.

For it was before this data, the total release of radioactive material to the "Fukushima-1" was from 370,000 to 630,000 terabecquerels.

Experts NISA also published the results of its own assessment of the rods of the first, second and third reactors after the accident. In particular, it has been suggested that the process of melting of the rods in the first and second power was faster than estimated by the experts of the operating company, "Fukushima-1" Tepco.

According to NISA, the melted fuel in the first reactor has penetrated into the housing unit at about 20:00 local time on 11 March 2011 — after about five hours after the earthquake. A similar process took place in a second reactor in the late evening on March 14.

These data do not correlate with calculations Tepco. According to the company-operator "Fukushima-1", the first and second housing units were damaged on 12 and 16 March respectively.

It is expected that these NISA will be considered in the preparation of the report, which the Japanese delegation will speak at a conference this month organized by the IAEA.

Emergency situation at the plant "Fukushima-1" occurred because of the powerful earthquake on March 11 and the ensuing tsunami. As a result of the disaster at the nuclear power plant cooling system is disconnected, so that the fuel rods in the three operating reactors melted. Background radiation at the Japanese station and around the substantially increased, causing a Resident 20-kilometer radius of the population was evacuated.

In April 2011 disaster at the "Fukushima-1" has received the highest rating on the international scale — seven points. Earlier this way was assessed only nuclear accident at Chernobyl.

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