FIELD: recovery of radioactive waste solutions. SUBSTANCE: introduced in radioactive waste solution is concentrated solution of sodium hydroxide in the amount of 1.0 to 1.2 mole per 1.0 mole of ammonium nitrate or liquid radioactive waste containing sodium hydroxide. Mixture obtained is concentrated by evaporation at temperature of 90- 110 C, then vapor phase is rinsed and condensed. Sodium nitrate produced in the course of concentration of mixed-up solutions by evaporation is concentrated in bottoms solution. EFFECT: provision for complete recovery of ammonium nitrate containing solutions. 2 cl, 2 dwg, 1 tbl
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