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高温工学試験研究炉HTTRにおける溶融ワイヤを用いた制御棒の温度計測

Temperature measurement of control rod using melt wire in High-Temperature Engineering Test Reactor (HTTR)

濱本 真平; 栃尾 大輔; 石井 俊晃; 澤畑 洋明

Hamamoto, Shimpei; Tochio, Daisuke; Ishii, Toshiaki; Sawahata, Hiroaki

高温工学試験研究炉(HTTR)の制御棒温度を測定するために、制御棒の先端に溶融ワイヤを設置した。原子炉出力100%の状態から原子炉をスクラムさせた後、溶融ワイヤを制御棒から取り出し、外観を目視で観察した。その結果、融点が505$$^{circ}$$C以下の溶融ワイヤは溶融しており、融点が651$$^{circ}$$C以上の溶融ワイヤが溶融していないことが確認できた。よって制御棒先端の最高到達温度は、溶融ワイヤが設置されている位置で505$$^{circ}$$Cから651$$^{circ}$$Cの範囲にあることが分かった。また運転中の制御棒の最高到達温度は、制御棒被覆管材Alloy800Hの使用制限値900$$^{circ}$$Cを超えていないことを確認した。

A melt wire was installed at the tip of the control rod in order to measure the temperature of High Temperature engineering Test Reactor (HTTR). After experience with reactor scrum from the state of reactor power 100%, the melt wire was taken out from the control rod and appearance has been observed visually. It was confirmed that the melt wires with a melting point of 505 $$^{circ}$$C or less were melted, and the melt wires with a melting point of 651 $$^{circ}$$C or more were not melted. Therefore, it was found that the highest arrival temperature of tip of the control rods where the melt wires are installed reaches within the range of 505 to 651 $$^{circ}$$C. And it was found that the control rod temperature at the time of reactor scram does not exceed the using temperature criteria (900 $$^{circ}$$C) of Alloy 800H of the control rod sleeve.

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