Japanese officials used claims of inaccuracy to divert release of critical radiation data despite validating concerns

Author: 2 Comments Share:

Japanese officials have failed to justify why it took them over a month to disclose large-scale releases of radioactive material in mid-March at the crippled Fukushima Daiichi nuclear power plant.

A special government tool had been producing critical maps, and other data, hourly since the first hours after the catastrophic earthquake and tsunami, some of the maps clearly showed a plume of nuclear contamination extending to the northwest of the plant, beyond the areas that were initially evacuated.

Japan’s nuclear safety agency and the science ministry had data on the spread of radioactive materials that could have prevented unnecessary radiation exposure, but decided to sit on it instead of reporting it to the crisis management center at the prime minister’s office.

Accurate or Not?

The ministry has argued that the data was only predictions and releasing it could have caused unnecessary public disorder, and since the tsunami had knocked out sensors at the plant: without measurements of how much radiation was actually being released by the plant, it was impossible to measure how far the radioactive plume was stretching.

“Without knowing the strength of the releases, there was no way we could take responsibility if evacuations were ordered,” said Keiji Miyamoto of the Education Ministry’s nuclear safety division.

However as it turned out later its predictions were fairly accurate, yet SPEEDI data was never used in mapping out the evacuation routes for Fukushima Prefecture residents.

A new report from Japan’s science ministry casts serious doubt on the officials that the readings were inaccurate, and exposes that central government confirmed that the  SPEEDI radiation fallout simulations were accurate, and reliable, but still refused to release the data for more than one month after the nuclear accident in Fukushima.

The science ministry’s report reveals that not only were ministry officials worried about the simulations, they also double checked the physical levels.

Continued on Page 2…


Previous Article

In-Focus Japan: 1 in 5 Evacuees might not be able to return home – More complaints filed against TEPCO and Officials – 2011 record year for renewables –

Next Article

Russia’s largest nuclear icebreaker reduced to transporting tourists to the North Pole this summer


  1. As you fear, all kinds of the radioactive polluted foods have already been sold and eaten everywhere in Japan thanks to irrational nationality…
    Here we have a new one.

    Test planting of rice and vegetables in their protective suits in Okuma town, Fukushima

    (Daily “Fukushima-Minpo”, Jun 13, 2012)

    The town of Okuma, all of which had been a hazard area because of TEPCO’s Fukushima Daiichi nuclear accident, did test planting of rice and vegetables in order to see the absorption of the radioactive into the crops in an open field on the 12th of June.

    According to the town, such test planting in this warning area is the first effort in the Futaba county of Fukushima. The town staff is to manage the crops and to examine the harvest from time to time.

    This was carried out in fields near town office in Shimonokami aza Shimizu area. They are to grow rice and vegetables in a 4-meter-square open field to determine radioactive concentration. As its experimental group, another one is provided with the topsoil removed about 5 cm depth for the same planting next to the fields.

    The town staff worked in protective suits. First they planted rice in a paddy field, then seeded carrot, spinach, white radish, etc. They said this would bring useful data for restart the crop production after several years.

    According to the town, radioactive index near its office shows 7-8 μSv/h.

    photo: Town staff planting rice in their protective suits

Leave a Reply