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- 저자 : Boris F. Myasoedov (검색결과 1 건)
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Solidification of high level waste using magnesium potassium phosphate compound
Sergey E. Vinokurov,Svetlana A. Kulikova,Boris F. Myasoedov 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Compound samples based on the mineral-like magnesium potassium phosphate matrix MgKPO4 6H2Owere synthesized by solidification of high level waste surrogate. Phase composition and structure ofsynthesized samples were studied by XRD and SEM methods. Compressive strength of the compounds is12 ± 3 MPa. Coefficient of thermal expansion of the samples in the range 250e550 C is(11.6 ± 0.3) 10 6 1/ C, and coefficient of thermal conductivity in the range 20e500 С is 0.5 W/(m K). Differential leaching rate of elements from the compound, g/(cm2 day): Mg - 6.7 10 6, K - 3.0 10 4,P - 1.2 10 4, 137Cs - 4.6 10- 7; 90Sr - 9.6 10 7; 239Pu - 3.7 10 9, 241Am - 9.6 10 10. Leachingmechanism of radionuclides from the samples at the first 1e2 weeks of the leaching test is determinedby dissolution (137Cs), wash off (90Sr) or diffusion (239Pu and 241Am) from the compound surface, andwhen the tests continue to 90e91 days - by surface layer depletion of compound. Since the compositionand physico-chemical properties of the compound after irradiation with an electron beam (absorbeddose of 1 MGy) are constant the radiation resistance of compound was established
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