Mobile unit for enclosing hot solid waste in a metal matrix

Radon Scientific Planning Department, Moscow. Translated from Atomnaya Énergiya, Vol. 74, No. 6, pp. 531-533, June, 1993.     

Basic principles and proposals for rehabilitation of radioactively contaminated objects and grounds of the kirovo-chepetsk chemical works

The results of an examination of objects and grounds of the Kirovo-Chepetsk Chemical Works are presented. The methods used to perform a radiation survey are described briefly. The data obtained are used as a basis for a concept of rehabilitation of radioactively contaminated objects and grounds of the works. The radwaste volumes are determined for each object and possible ways to handle them are proposed. The technologies for handling radwastes are examined. The primary problems that must be solved without delay are determined.     

Radiation survey of radioactive objects at the Kirovo-Chepetsk chemical combine

The methods and means for performing a radiation survey of objects and grounds of the Kirovo-Chepetsk Chemical Combine are presented. Results of a survey of rooms in the combine and measurements of soil contamination levels on the grounds and of the specific activity of samples of radioactive wastes in temporary repositories and slag dumps are presented. The surveys make it possible to develop a concept and a project for rehabilitating these objects and grounds and to choose a technology for handling radioactive wastes during liquidation or preservation of repositories.     

Feasibility of Processing of Accumulated Liquid Radioactive Waste from BN-350 Reactor

It was found that the filtrate yielded by passing bottoms decantates through selective sorbents has the volume activity with respect to ¹³⁷Cs and ⁶⁰Co significantly greater than DK_b. A pretreatment of the bottoms before selective sorption was tested, which consisted in ozonation and subsequent filtration of the resulting precipitate. By the example of the liquid radioactive waste (LRW) decantate with the highest volume activity, it was shown that by combining the pretreatment with selective sorption it was possible to remove ¹³⁷Cs, ⁶⁰Co, and ⁵⁴Mn radionuclides from the decantate to the level under DK_b. Cementation of the slurries in the slurry/cement ratio of 0.3-0.7 was tested. It was proposed that the decantate freed from radionuclides be discharged into the Caspian Sea, and the slurry and secondary wastes yielded by decantate decontamination be included into cement compound.     

Handling radwastes during rehabilitation of contaminated objects and grounds of the Kirovo-Chepetsk Chemical Works

Possible ways to rehabilitate the objects and grounds of the Kirovo-Chepetsk Chemical Works are examined. The technology for handling radioactive wastes and methods for immobilizing radioactive wastes in repositories are briefly described. Ways to eliminate radwaste repositories containing medium-level wastes with fissile substances and α-emitters are proposed. The experience gained in such work abroad is examined and the problems which must be solved to rehabilitate the objects at the Works are noted.