METHOD OF CLEANING AND DECONTAMINATION OF EQUIPMENT ON NUCLEAR POWER PLANTS (VERSIONS) Russian patent published in 2010 - IPC G21F9/04 G21F9/06 G21F9/12 

FIELD: power industry.

SUBSTANCE: after equipment decontamination by acetic acid solutions containing oxygen, and stechiometric ortho-phosphoric and sulphuric acid or ortho-phosphoric excess is introduced into liquid radioactive waste (LRW) solution. After that resulting heterogenous product is subjected to thermal treatment under the temperature of 100-120°C. Acetic acid condensate is returned into decontamination process flow, and produced by heat treatment salt concentrates are embeded using traditional binding materials or phosphatic hardening materials as matrices.

EFFECT: process simplification of equipment deactivation and LRW decontamination, reducing consumption of chemical agents and radioactive wastes volume during deactivation, increasing the extent of salts introduction into suggested matrices, quality of hardened products and reliability of their long-term storage, improvement of ecological situation in the places of long-term storage of radioactive wastes.

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