EDN: VXYUCB
Authors & Affiliations
Legkikh K.G., Fokina D.А.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Legkikh K.G. – Head of Laboratory. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-70-00 (add. 88-03); e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Fokina D.А. – Intern Researcher.
Abstract
The problem of processing liquid radioactive waste (LRW) is an important task in the operation of reactor installations of any type. In most cases, the processing of raw materials is reduced to minimizing their volume by classical evaporation. As a result, liquid radioactive concentrates (LRC) are formed – colloidal systems consisting of two phases: the aqueous part and the bottom residue – pulp. Pulp – mineral fine granules with an adsorbed layer of organics of complex chemical composition, therefore their direct cementation is impossible. The method of purification of LRC by a multi-stage sorption process using modifications of an inorganic sorbent is considered. Before the sorption process, a stage of oxidation of liquid radioactive concentrators and subsequent filtration was carried out in order to reduce the concentration of organic impurities. Otherwise, with an increased content of organic impurities, an undesirable process of etching of the sorbent occurs. Clinoptilolite, the most widespread sedimentary mineral in nature, was chosen as a sorbent for purification from α- и
β-nuclides, since it showed the highest degree of extraction for a α-nuclides – 99,99 %. In order to increase the degree of extraction by β-nuclides, method of modification of clinoptilolite into two forms were carried out:KLN-1 and KLN-2. The KLN-2 form proved to be the most effective for cleaning the LCR from β-nuclides, therefore, it will be more expedient to make several sorption columns with different modifications of the sorbent during the processing of LRC and LRW, this will ensure the greatest the degree of extraction. After the end of the service life, the sorption columns are proposed to be placed in the non-returnable protective container. The conducted studies have revealed the necessary stages of purification for both LRC and LRW.
Keywords
processing liquid radioactive waste, liquid radioactive concentrators, radiation safety, sorption purification, modification of sorbents, purification stages, curing technologies, oxidation of organic impurities, clinoptilolite, points long-terms storage
Article Text (PDF, in Russian)
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Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2025, no. 2, 2:21
