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About appropriate disposal of removal soil caused by Mike Rothe pot correspondence



About 1 processing policy

 We kept in place where person in facility site did not enter after removing the soil when Motoichi for indication space radiation doses more than were measured in so-called "microspot" where radiation dose that was higher than the outskirts was measured extremely locally correspondence in Yokohama-shi, and having sealed in double plastic bag.

 About the removal soil which we kept in facility site, we measured space radiation dose again and decided to cope as follows based on result of a measurement.

(1)In the case of eyes cheap under for Motoichi result of a measurement

  As a general rule, we make backfill, covering up seed with soil handling of thickness around 10cm in facility site.
   ※Radiation doses decrease with progress of time, and it becomes in a safe state, but, according to "decontamination conduct guidelines by the municipalities" (Nuclear Emergency Response Headquarters), effect to cover radiation dose 74% by covering up seed with soil of thickness around 10cm is provided more.

(2)When result of a measurement is more than in indication of Motoichi correspondence

  As a general rule, we keep basement as higher than covering up seed with soil 30cm in facility site after having put in the plastic containers so that water does not enter. In addition, we mark to know place that we filled and state that we keep clearly.
   ※Because effect to cover radiation dose 98% is provided when we do covering up seed with soil of thickness 30cm according to "decontamination conduct guidelines by the municipalities" (Nuclear Emergency Response Headquarters), influence in ground extremely decreases.

 (1)Both, (2) cases measure space radiation dose of place that covered up seed with soil and confirm that we are safe without changing with neighboring measurements.

 In addition, we examine correspondence in radiation task force when the situation not to correspond to these occurs.


[reference 1] Indication of Motoichi correspondence
 
Distance from object Measurements
50cm or 1m We cope using 0.23μSv/h or more as an indication
1cm We cope using 0.59μSv/h or more as an indication


[reference 2] This policy makes decontamination-related guidelines (May, 2013: the second edition) according to "guidelines to affect storage on removal soil" (Ministry of the Environment).
http://www.env.go.jp/jishin/rmp/attach/josen-gl04_ver2.pdf

[reference 3] Decontamination conduct guidelines (Nuclear Emergency Response Headquarters) by the municipalities
http://www.meti.go.jp/press/2011/08/20110826001/20110826001-6.pdf


About the removal soil keeping in 2 schools and nursery school

 About disposal of removal soil caused by Mike Rothe pot correspondence, we established method of safe undergrounding processing in reference to guidelines on country in Motoichi. However, we added modi operandi to school and nursery school as follows to be able to give a flexible response in consideration for relief of protectors about the removal soil which we kept.

(1)In the case of eyes cheap under for Motoichi result of a measurement

  Should be correspondence of 1(1) mentioned above, but can enter container to bury depending on the situation of facility more deeply, and bury; dig up, and take hedge, and decide to be able to devise undergrounding method, and these correspondence decides to be able to do the handling same as following (2) more when it is difficult.

(2)When result of a measurement is more than in indication of Motoichi correspondence

  According to to this, we continue storage at place where child in facility site does not approach for the time being. In storage, we can tolerate long-term storage and measure space radiation dose regularly and confirm safe thing without changing with neighboring measurements.

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