Matrices for RW immobilization

Summary:

All radioactive waste before disposing in underground repository must be conditioned, i.e. transformed in solidified form resistant to chemical (radionuclides must not be released if water enters the repository), radiation and thermal effects (consequences of RW components radioactive decay), and mechanically resistant (intact during transportation and placement in the disposal facility).

Various types of matrices (glass, ceramics, cements) have their own advantages and disadvantages. Specific types of RW require different types of matrices.

In our lab we investigate various matrix compositions that suit the best for traditional and new types of RW (e.g., obtained as a result of pyrochemical reprocessing of spent nuclear fuel waste).


Main scientific results:

  • We have formulated compositions of clay materials allowing to include up to 20 wt% of RW representing LiCl-KCl eutectics with fission products.
  • It was shown that cement materials are stable even at high radiation exposure (100 MGy).
  • We have detected the formation of secondary rhabdophane phases on the surface of monazite minerals as a result of radiation damage.

 


Selected publications:

  1. В.Y. Zubekhina, A.A. Shiryaev, B.E. Burakov, I.E. Vlasova, A.A. Averin, V.O. Yapaskurt, V.G. Petrov. Chemical alteration of 238Pu-loaded borosilicate glass under saturated leaching conditions // Radiochimica Acta, 2020, DOI: 10.1515/ract-2018-30970
  2. А.П. Варлаков, А.А. Жеребцов, В.Г. Петров, В.В. Капустин, Г.А. Варлакова, И.Э. Власова, И.Д. Харитонов, С.Н. Калмыков. Оценка радиационных и температурных нагрузок на цементный компаунд, содержащий имитаторы радиоактивных отходов // Радиоактивные отходы, 2020, DOI: 10.25283/2587-9707-2020-1-66-72
  3. А.А. Жеребцов, В.В. Капустин, Г.А. Варлакова, А.П. Варлаков, В.Г. Петров, И.Э. Власова, И.Д. Харитонов, С.Н. Калмыков. Химическая стойкость и структурные характеристики цементных компаундов с имитаторами радиоактивных отходов после воздействия ионизирующего излучения // Атомная энергия, 2019, DOI: 10.1007/s10512-020-00637-z
  4. А.П. Варлаков, В.В. Капустин, Г.А. Варлакова, А.А. Жеребцов, В.Г. Петров, Е.А. Ширшин, С.Н. Калмыков. Влияние радиационных нагрузок, характерных для высокоактивных отходов, на свойства цементной матрицы // Радиоактивные отходы, 2018.