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ナトリウム中目視検査装置の開発,3; Na中画像化試験

Development of under sodium viewer, 3; Imaging test in sodium

相澤 康介; 近澤 佳隆; 荒 邦章; 由井 正弘*; 神納 健太郎*; 平松 貴志*

Aizawa, Kosuke; Chikazawa, Yoshitaka; Ara, Kuniaki; Yui, Masahiro*; Jinno, Kentaro*; Hiramatsu, Takashi*

ナトリウム冷却高速炉の原子炉容器内構造物等の目視検査のために、超音波を用いたナトリウム中目視検査装置の開発を進めてきた。超音波の受信方式として金属箔(ダイヤフラム)の振動変位をレーザ光で検出する光方式の受信センサを採用した装置の実用化を目指している。要素技術の高度化に向けた要因に着眼し、水中及びナトリウム中(約200$$^{circ}$$C)試験を通じて、主に光方式受信センサ要素を対象とした音圧伝播挙動ならびに画像再構成に関わる支配要因について検討した。

Inspection in opaque liquid metal coolant is one of important issues for sodium-cooled fast reactors. To facilitate operations and maintenance activities, the under sodium viewer (USV) has been developed. JAEA works target practical use of the USV which adopts the optical receiving system. The optical receiving system measures the vibration displacement of diaphragm by using a laser as a receiving sensor. In this study, the experiments in water and in sodium focused on the improvement of elemental technology were conducted. From the experimental results, the controlling factor about the propagation behavior of sound pressure and the image reconstruction were investigated.

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