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炉心燃料物質と黒鉛の化学的反応性に係る検討,2; 二酸化ウランと黒鉛の示差走査熱量分析

A Study on the chemical reaction between fuel materials and graphite block, 2; Differential scanning calorimetry of the uranium dioxide and graphite

内藤 裕之; 山本 雅也; 前田 茂貴   ; 榑松 繁*; 佐藤 勇*; 前田 宏治  

Naito, Hiroyuki; Yamamoto, Masaya; Maeda, Shigetaka; Kurematsu, Shigeru*; Sato, Isamu*; Maeda, Koji

二酸化ウラン(UO$$_{2}$$、劣化ウラン)焼結体と黒鉛ブロックの示差走査熱量分析を実施し、UO$$_{2}$$焼結体と黒鉛ブロックとの反応に係る基礎的なデータを取得した。試料最高温度1200$$^{circ}$$C(安全容器内想定条件の1000$$^{circ}$$Cに余裕をみた値)、酸素濃度10ppmまでの条件においてUO$$_{2}$$焼結体と黒鉛ブロックの反応は確認されず、「常陽」の安全容器内条件下ではUO$$_{2}$$焼結体と黒鉛の反応による黒鉛ブロックの有意な減肉は生じないと推定できた。

In this study, we obtained the fundamental data of the uranium dioxide pellet and the graphite block by differential scanning calorimetry. It is shown that there is no reaction between the uranium dioxide pellet and the graphite block under the maximum temperature 1200$$^{circ}$$C and the maximum oxygen concentration 10 ppm. Therefore, we consider that the graphite blocks will not be thinned by the reaction between the fuel materials and the graphite block in the safety vessel of the experimental fast reactor JOYO.

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