JAEA-Testing-2011-007.pdf:46.74MB - 日本原子力研究開発機構

1. Introduction
JAEA-Testing 2011-007
JAEA-Testing 2011-007
Radioactive materials released into the environment during the accident at the
TEPCO Fukushima Daiichi Nuclear Power Plant due to the Great East Japan
Earthquake were dispersed widely and precipitated in different areas. Swimming
pools that children are awaiting opening in summer are not the exception.
The radioactive materials in the swimming pool could be removed safely by
processing the pool water according to correct treatment procedures based on
knowledge obtained to date.
The method we employed utilizes a mineral called zeolite and poly-aluminum
chloride (PAC) as a flocculant, which are commonly used for processing water.
Based on data and previous experience in decontamination tests of the swimming
pool water using this flocculant, we determined the essential elements of the work
flow and practical procedures, and compiled them as a guide for the
decontamination of the swimming pool water.
By following the procedures described and using materials and tools shown in this
guide, teachers, parents or volunteers could decontaminate the swimming pool
water, or private companies could establish a decontamination business.
Thus, this guide has two major purposes: to serve as a manual for the steady
step-by-step implementation of decontamination procedures of swimming pool
water, and to make records that allow verification of what works and how
correctly the work was completed, at a later stage.
As adults, all of us will cooperate to allow children to return to the swimming
pools – this is our desire. We prepared this guide with the hope that it will help
those adults engaged in this work in the future.
In presenting this guide, we also have a request to those of you using it. We
compiled all of our knowledge and our experience into this document, realizing
however, that this guide will not be complete. We would like to improve the guide
with you. Please inform us anything you notice about the guide that could be
changed or added to make it better.
The figure below show a whole picture of work described in the guide, intending to
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