低レベル放射性雑固体廃棄物のプラズマ溶融技術の基礎検討その2溶融固化体の性状に与える廃棄物組成の影響

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  • Fundamental Research on Thermal Plasma Technology for Treatment of Low Level Radioactive Solid Waste Part II Influence of Waste Composition on Material Properties of Solidified Products
  • テイレベル ホウシャセイ ザツ コタイ ハイキブツ ノ プラズマ ヨウユウ ギジュツ ノ キソ ケントウ ソノ2 ヨウユウコカタイ ノ セイジョウ ニ アタエル ハイキブツ ソセイ ノ エイキョウ

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Incombustible and combustible metallic materials simulating low level radioactive miscellaneous solid wastes generated from nuclear power plants are simultaneously melted by thermal plasma heating with non-radioactive tracers in oxidizing atmosphere (air). The solidified products show the following excellent properties suitable for final disposal.<br>The uni-axial compressive strength of slag layers is more than 50 MPa in every combination of materials.<br>The concentration of cold tracers and specific gravity are homogeneous in both metallic and slag layers of solidified products. Therefor, it must be easy to measure radioactivity of the waste form before final disposal.<br>The results of leaching test show that the solidified products have performance good enough to stabilize the radionuclides. <br>The cold tracers show a stable migration into solidified products and even Cs with a low boiling temperature can be captured in the slag layers more than 50 %.<br>From the above results, we concluded that the plasma melting technology can be applied to simultaneous treatment of miscellaneous solid wastes.

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