METHOD OF TREATING LIQUID RADIOACTIVE WASTES OF ATOMIC POWER STATIONS (VERSIONS) Russian patent published in 2008 - IPC G21F9/08 

FIELD: physics; nuclear technology.

SUBSTANCE: present group of inventions pertains to treatment of liquid radioactive wastes, and particularly to methods of concentrating, drying and solidifying an evaporate concentrate. The method of treating liquid radioactive wastes involves concentrating wastes through evaporation at 105-150°C by adding glycerine to liquid radioactive wastes, at ratio of 1:9-1:1 in the evaporation zone. A glycerine evaporate concentrate is obtained from the process of concentrating liquid radioactive wastes. This concentrate is subjected to thermal treatment at 150°-200°C. The glycerine concentrate formed as a result is returned to the liquid radioactive wastes treatment cycle. The porous anhydrous salt product obtained after distillation of glycerine is solidified by adding portions of a binding substance to it until formation of a homogenous in situ block. After adding each portion of binding substance, the product is cooled to 85°-95°C. The next portion of binding substance is added after heating the product to 105-150°C. The proposed group of inventions is aimed at simplifying the technology of neutralisation of liquid radioactive wastes, reduction of the amount of glycerine used when concentrating the wastes, and improving the environmental situation at places of permanent disposal of radioactive wastes.

EFFECT: simplification of the technology of neutralisation of liquid radioactive wastes, reduction of the amount of glycerine used when concentrating the wastes, and improvement of the environmental situation at places of permanent disposal of radioactive wastes.

3 cl, 1 tbl