Tuesday update (7th June 2011)

Fukushima nuclear power plant update: get all the data

Japan is racing to gain control of the crisis at the Fukushima nuclear power plant. Where does the most detailed data come from?
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    The revelation has raised fears that the situation at the plant, where fuel in three reactors suffered meltdown, was more serious than government officials have acknowledged."

    Last month The World Bank estimated the cost of the nuclear crisis at $235bn (£144bn) - making it one of the world's most expensive disasters.

    The operators of the plant, Tokyo Electric Power (Tepco), announced record losses of 1.25 trillion yen (£9.5bn) as they struggle with the nuclear crisis still present. Tepco also announced last month that there is data that would indicate that during the immediate aftermath of the earthquake and tsunami, the fuel rods in three of the reactors had melted.

    Although it may be some time after the radiation levels at the Fukushima Daiichi nuclear power plant rose: the severity level changed from five to seven - the same level as Chernobyl in 1986, the Fukushima plant is still being focused on as more information and images appear.

    Fukushima nuclear power plant has been closely scrutinised as reports flow in on the progress of the situation - Japan's nuclear board previously raised the nuclear alert level from four to five in the weeks following the disaster and the JAIF warned of products such as dairy and spinach being restricted for shipping. Explosions and reports of nuclear fuel rods melting at the power plant have meant progress on the situation has been closely followed as has the environmental effects with concerns for marine life and spreading radiation through seawater. There were also concerns over radioactive dirt found in a school playground in Fukushima.

    Industry body the Japan Atomic Industrial Forum are currently publishing daily updates of the status of power plants in Fukushima which give great detail into the condition of each reactor. Ranked from a level of low to severe, the update records the conditions of core and fuel integrity, water level and containment amongst other key information. These are some of the most in-depth and recent records and show how the crisis is being handled.

    The table below shows the status of the reactors in the Fukushima Daiichi (the largest of the Fukushima power plants) and is colour coded to show the severity. Green for low, yellow represents high and red shows those of severe significance as judged by the JAIF. We have used JAIF's update 154 as of 12:00 local time as this is the most up to the minute data we can get. The format of these reports has changed as of 6th June 2011 and are now focused on countermeasures and only reactors one to four, therefore some of the details collated before are now unavailable. For full details you can download the report from JAIF.

    A table of major incidents and accidents at the plants can be found in our spreadsheet as can the data for Daini, Onagawa and Tokai Daini Nuclear power stations. What can you do with this data?

    Data summary

    Fukushima nuclear power plant update - 7th June 2011

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    SOURCE: JAIF

    Environmental effect in the vicinity of the station: -Air dose rate: 5～121μSv/h at the NPS border （Monitoring Post),　366μSv/h at the south side of the office building,　14μSv/h at
    the wet gate　[6/7 09:00]
    -Some radioactive materials (I, Cs, Pu, Am Cm and Sr) has been detected in the soil sampled at the site.
    Radioactive materials have been detected in samples corrected from underground water and also seawater at or near the site.
    Environmental monitoring has been enhanced [4/16-]。

    Evacuation: <1> Shall be evacuated for within 3km from NPS, Shall stay indoors for within 10km from NPS (issued at 21:23, Mar. 11th) <2> Shall be evacuated for within 10km from NPS (issued at 05:44, Mar. 12th)
    <3> Shall be evacuated for within 20km from NPS (issued at 18:25, Mar. 12th) <4> Shall stay indoors (issued at 11:00, Mar. 15th), Should consider leaving (issued at 11:30, Mar. 25th) for from 20km to 30km from NPS　<5>The 20km evacuation zone
    around the Fukushima Daiichi NPS is to be expanded so as to include the area, where annual radiation exposure is expected to be above 20mSv. People in the expanded zone are ordered to evacuate within a month or so. People living in the 20 to
    30km and other than the expanded evacuation area mentioned above, are asked to get prepared for staying indoors or evacuation in an emergency (announced on Apr. 11th and issued on Apr. 22nd)

    Radiation exposure of the workers: 30 workers has been exposed to radiation more than 100 mSv as of 5/30. It was found that two plant operators had taken in high level
    of radioactive iodine into the body. Evaluation made by a research institute shows that their exposure dose is somewhere between
    200mSv and 580mSv. [announced by TEPCO on 6/3] *Emergency exposure dose limit has been set to 250mSv