Plant for Cleaning NPP Still Bottoms

The plant is intended for processing of bottom stills formed during operation of nuclear power plants with VVER and RBMK reactors.

— Bottom stills are cleaned from radionuclides through ozonization, filtration, and selective sorption. Upon solidification of the solution, cleaned from radionuclides, it is treated as non-radioactive waste.
—Ozonization takes place in ejector devices while ceramic filters are used to separate sediment with radionuclides Со⁶⁰, Мп⁵⁴, Sr⁹⁰ etc. concentrated thereon. Selective cleaning from Cs is performed on ferrocyanide sorbents in container filters. The non-radioactive solution is solidified using a deep evaporation machine or a rotary film evaporator.
— Spent container filters along with the cement compound based on the ionization sediment are placed into a cask and are delivered to the SRW (solid radwaste) storage facility. Non-radioactive salts are dispatched to the factory waste disposal facility.

Ozone generator	Filtration unit	Deep evaporation unit	Non-radioactive melt grading section

LEVEL OF DEVELOPMENT

- Laboratory tests at seven nuclear power plants in CIS member-states;
- Bench tests at Kalinin and Kola NPPs, and at BN-350 reactor;
- Tests of experimental industrial plant at world's first NPP (Obninsk);
- Plant manufacture and commercial operation at Kola NPP since 2007.