Japan Earthquake: nuclear plants
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Feb25-12, 03:28 AM
pp 319 and following
f. Establishment of specific spots recommended for evacuation
By April 22 when deliberate evacuation areas and emergency evacuation preparation
zones had been established,
spots where annual cumulative radiation dose might exceed
20mSv assuming that the radiation dose levels continued afterwards had been found in
parts of Date-shi and Minami-soma-shi
. However, the distribution of these spots was not
understood for an extended area, but for a limited area. Hence,
Emergency Response Center did not designate those entire areas including these points as
deliberate evacuation zones. Instead, they decided to take a wait-and-see approach
observe how radiation dose might decrease with time by monitoring them over time.
on June 3, MEXT estimated cumulative radiation dose and
found that there were spots where the estimated annual cumulative radiation dose for one
year after the nuclear accident might exceed 20mSv
of a criteria for deliberate evacuation
zones, in parts of Date-shi and Minami-soma-shi, which are located outside the deliberate
In response to this fact, the NERHQ discussed the adoption of concrete measures for
locations where spots with high radiation dose were found in some areas and created a
guideline referred to as "Response to specific spots estimated to exceed an integral level of
exposure of 20mSv over a one-year period after the accident." The guideline stated that
spots where the estimated annual cumulative radiation dose over a one-year period after
the nuclear accident might exceed 20mSv should be designated as "specific spots
recommended for evacuation," and that the NERHQ should notify all residents living in
these spots and assist and support their evacuation. On June 16, the Government
Emergency Response Center asked the NSC for its advice on this guideline. That same
day, the NSC responded to this request replying to the effect that it had no objection to the
Government Emergency Response Center' ideas, although it might be necessary to
consider possible ways to solve this problem without conducting an evacuation, including
finding ways to decontaminate the areas that were only partially contaminated with high
concentration of radioactive materials.
Based on this advice, the NERHQ decided that the spots where the estimated annual
cumulative radiation dose over a one-year period might exceed 20mSv should be
designated as specific spots
That same day, Chief Cabinet
Secretary Edano released a statement to that effect.
It was decided that the NERLHQ should specify spots, per house, where
decontamination is not easy and are estimated to exceed 20mSv/year, through mutual
consultation between the Fukushima prefectural government and the cities, towns or
villages where those spots are located. Through mutual consultation with the respective
municipal governments, the NERLHQ designated parts of Date-shi on June 30 and
November 25, parts of Minami-soma-shi on July 21 and August 3, and parts of
Kawauchi-mura as specific spots recommended for evacuation.
for evacuation have not been issued with
pursuant to the provisions of Article 20, Paragraph 3 of the Act on
Special Measures Concerning Nuclear Emergency Preparedness.
This policy is based on
the idea that specific spots
for evacuation are not dangerous enough
instruct all residents to begin evacuation since radiation levels will be minimal if residents
leave the area, and that the government will provide information to alert them to the
possibility of radiation exposure and support residents if they need to be evacuated.
All formatting mine.