Abstract: A decommissioning action of the pilot facility for uranium isotope enrichment was taken in 1985.9-1986. 12. It's the stage 3 decommissioning, requiring the building to be released for unrestricted use; all equipments to be removed from the site, and decontaminated to acceptable level. This decommissioning action include: dismantling the units, disassembly of the parts of plant, package, transport,decontamination, radiation monitoring, waste management, and treatment of materials. Decontamination is implemented mainly by chemical process, while using mechanical and smelting methods as supplementary measure. More than 1300 tons of metal parts are decontaminated with positive effect. Event waste is about 50 tons. Monitoring on personnel, work site, and environment suggested that risks produced from decommissioning are insignificant.