Radwaste vitrification

Radwaste vitrification is currently one of most reliable and advanced methods of its disposal. The «Rasplav-Steklo» facility was developed in NITI for single-stage radwaste vitrification by induction melting in cold crucible.

In cooperation with St. Petersburg Electrotechnical University «LETI» and JSC «V.G. Khlopin Radium Institute» the following work was done:

  • The melters of different design were tested. A large-diameter cold-crucible melter with low-frequency induction was developed and manufactured in NITI. The efficiency of using the melter was demonstrated during phosphate glass synthesis
  • The glass composition chosen for radwaste vitrification was improved
  • Prototype radwaste was used during glass matrix synthesis experiments. Concentrate content in glass matrix was up to 30 wt-%. Radionuclide leaching rate was about 10-5g/cm2day, which is in compliance with the requirements to chemical stability of vitrified high-level radwaste
Technical characteristics
Met retention method Induction melting in cold crucible
Installed capacity, kW 160
Current frequency at elevated temperatures, MHz 0.44
Melt weight in crucible, kg up to 200
Melt temperature, °С up to 1500
Environment air
Melt composition phosphate and borosilicate glass + fission products
Possible melt handling operations Melt discharge

NITI has theoretical and experimental resources for conduction of research activities to try out different radwaste vitrification methods.