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

JAEA-Testing 2011-007
JAEA-Testing 2011-007
(e) 3 rd treatment of the supernatant and precipitate
When the radioactivity concentration of the supernatant after secondary
treatment is higher than the criteria for discharge, transfer the water in the 1 ton
plastic tank to 100 L tank using a small capacity engine pump where 3rd treatment is conducted using the zeolite (photos shown below). Measure the
radioactivity of the transferred water and write down the measurement results in
the form, “Record 14: Radioactivity concentration in the supernatant before the
3rd treatment”.
Add zeolite to the water in the 100 L tank. No flocculant (PAC) is used in the 3rd treatment.
Transfer supernatant with the radioactivity concentration higher
than the criteria for discharge to the 100 L tank using a small
capacity engine pump, and provide 3 rd treatment using the zeolite.
Add zeolite only for the 3 rd treatment
Treat the precipitate left on the bottom of the tank using the same method as that
applied to the precipitate left on the bottom of the plastic tank, as described in the
section “(6) Treat the precipitate left on the bottom of the 1 ton plastic tanks”.
Keep at rest for one night and measure radioactivity concentration of filtrated
water accumulated in the tray, and write down the results in the form, “Record 15:
Radioactivity concentration in the water after filtration with a filter cloth”.
When the radioactivity concentration is lower than that in the criteria for
discharge, discharge the water in the tray. When it is higher, dilute the water with
the tap water, and discharge it after checking for the compliance.
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