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The draing of noble metals in vitrified nuclear waste by a melter with a sloping floor -Research Report on Solidification of High-Level Liquid waste

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五十嵐 寛; 高橋 武士

not registered; Takahashi, Takeshi

高レベル廃液ガラス固化技術開発の一環として核分裂生成物中の白金族元素に対応したガラス溶融炉を開発するため、白金族元素挙動に及ぼす炉底勾配の影響を評価した。試験溶融炉は、溶融表面積が実規模の約十分の一で、炉底の勾配が30度および45度の2種類である。ガラス原料には白金族元素を含有するガラスカレットを使用した。30度炉底勾配試験溶融炉の運転では白金族元素の影響が観察されたが、45度炉底勾配試験炉では、白金族元素の影響は認められなかった。白金族元素抜き出し率は、30度炉底勾配試験で約30%であるのに対し、45度炉底勾配試験では約80%であった。試験終了後に炉内残留物の観察を行ったところ、30度の斜面上に最大約40mmの厚さの堆積物が認められたが、45度の斜面には炉底付近で20mm前後の堆積物が残っている程度であった。試験結果から、45度炉底勾配は白金族元素の抜き出しに有効であるとともに、その炉構造は炉底における若干量の白金族元素の堆積に対しても、有効であると判断された。

Joule heated ceramic melter has been developed to vitrify high-level liquid wastes (HLLW) from reprocessing nuclear spent fuel at Power Reacter and Nuclear Fuel Development Corporation (PNC). Noble metal elements such as ruthenium, paladium and rhodium are contained as fission products in the HLLW. The operational chracteristics of Joule-heated ceramic melter were studied on the effects of these elements. Two small scale melters with sloped floor were fabricated and tested. The slope was 30$$^{circ}$$ and 45$$^{circ}$$ for each. The operational characteristics including electrode resistance, temperature profile etc. were monitored. The drain efficiency of noble metal elements from the melters during the glass drain operation were evaluated. After the test operation, the melters were cut after cooled with the glass left in the melting cavities, following the termination of the test operations. The sediments of the precipitations of the noble metal elements were evaluated from the sectional observation for the melter. The results from the studies were compared between 30$$^{circ}$$ and 45$$^{circ}$$ slopes and discussed. It was concluded that the 45$$^{circ}$$ sloped floor was clearly effective to drain the noble metal elements and the structure of the 45$$^{circ}$$ sloped floor melter was compatible with some amount of precipitates at the bottom.

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