Journal of Nuclear Fuel Cycle and Environment
Online ISSN : 2186-7135
Print ISSN : 1884-7579
ISSN-L : 1343-4446
Research Article
Radionuclides Behavior during Nuclear Waste Melting by the Induction Heat Melting System
Masamichi ObataTakaya TeshimaTakafumi KurahashiYutaka KanagawaMasaru HayashiSatoshi KarigomeYoshihiro Akagawa
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JOURNAL FREE ACCESS

1998 Volume 4 Issue 2 Pages 21-30

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Abstract

  Simulated and real miscellaneous nuclear wastes were treated in the induction heating melter to form the molten product. The residual ratio and the distribution ratio of radionuclides during the melting process were measured for different operational conditions and type of waste.
  Laboratory-scale and mock-up scale tests were carried out, with radioactive tracers (C-14, Co-60, Ni-63 as a simulant of Ni-59 and -63, Sr-85 as of Sr-90, Tc-99, I-131 as of I-129, and Cs-134 as of Cs-137) and non-radioactive tracers (Co, Ni, Sr, Nb as of Nb-94, Re as of Tc-99, Cs, and Ce as of alpha nuclides).
  More than 50% of Cs remained in the molten product under the appropriate operational conditions. Nearly 100% of Co, Ni, Sr, Nb and Ce, and 85-100% of Re remained in the molten product. C-14 and I-131 did not remain. Co, Ni, Tc and Re were found in the metal layer of the molten product, Cs, Sr and Ce in the ceramic layer, and Nb in both layers. All elements were distributed uniformly in each of the layers.

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© 1998 Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan
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