Method of recovering and storing radioactive iodine by freeze va

Details Method of recovering and storing radioactive iodine by freeze va Method of recovering and storing radioactive iodine by freeze va

1991-08-15

1993-10-12

Walsh, Donald P.

Compositions

Radioactive compositions

252630, 376310, 264 05, 976DIG377, 976DIG378, 976DIG395, G21F 916

Patent

active

052522580

ABSTRACT:
The invention provides a method of recovering and storing radioactive iodine by a freeze vacuum drying process, in which off-gas generated when spent fuel is subjected to shearing and dissolving treatments is scrubbed and, when necessary, is subjected to a precipitation treatment by addition of additives, after which waste liquid containing radioactive iodine is freeze-dried by a freeze vacuum drying process to recover radioactive iodine as iodine compounds. As a result, since the radioactive iodine does not vaporize, release of the radioactive iodine into the environment can be eliminated. In addition, consumption of a collecting agent such as silver zeolite for collecting vaporized radioactive iodine can be reduced. The iodine compounds containing the recovered radioactive iodine is given the same composition as a stable, naturally occurring mineral and is solidified and mineralized as by a high-pressure press. This makes it possible to store long half-life .sup.129 I radioactive iodine safely for an extended period by sealing recovered radioactive iodine in stable minerals for a long period of time.

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