Development of under sodium viewer for next generation sodium-cooled fast reactors

Aizawa, Kosuke; Chikazawa, Yoshitaka; Ara, Kuniaki; Yui, Masahiro*; Uemoto, Yohei*; Kurokawa, Masaaki*; Hiramatsu, Takashi*

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Next Generation Nuclear Systems for Sustainable Development (FR-17) (USB Flash Drive), 9 Pages, 2017/06

Inspection in opaque liquid metal coolant is one of important issues for sodium-cooled fast reactors. To facilitate operations and maintenance activities, various under sodium viewers (USVs), including horizontal USVs for obstacle detection for a long distance and imaging USVs for a short and middle distance imaging, have been developed in several research institutes and countries. In this study, an imaging USV for a middle distance, approximately 1 m, has been developed. The USV in this study adopts an optical receiving system which measures the vibration displacement of diaphragm by using a laser as a receiving sensor. This study mainly focuses on the sensitivity improvement for a transmission sensor and the receiving sensor. In addition, an imaging experiment in the water was conducted using the new transmission sensor and receiving sensor. The experimental results showed that the newly developed USV sensors can make higher resolution images of a target than the previous sensors.

Study on inspection and repair technologies toward the JSFR, 7; Development of electromagnetic thruster for under sodium vehicle

Tagawa, Akihiro; Yamashita, Takuya; Uemoto, Yohei*; Takeishi, Masayuki*

no journal, , 

For driving device of under sodium vehicle can not use motor with propeller. The main reason is that oil leaks occur most often at the shaft seals in motor. We developed electromagnetic thruster. The reason why electromagnetic thruster is that sodium have Electromagnetic-Hydro property.

超音波検査装置

近澤 佳隆; 荒 邦章; 相澤 康介

由井 正弘*; 谷口 善洋*; 植本 洋平*

JP, 2014-065251  Patent licensing information  Patent publication (In Japanese)

【課題】受信信号に重畳されるノイズを低減し、画像化における視認性を向上させることを可能とした超音波検査装置を提供する。 【解決手段】媒質40中に存在する被測定対象物50に対して超音波61を送信する送信センサ11と、受信センサ用貫通孔14Cを有するバックアッププレート14並びに受信センサ用貫通孔14Cを覆うダイヤフラム16を有する受信センサ12とを備え、被測定対象物50によって反射された超音波61の反射波62によるダイヤフラム16の振動を解析して被測定対象物50までの距離の測定または被測定対象物50の可視化を行う超音波検査装置において、バックアッププレート14又はダイヤフラム16又はその両方に、バックアッププレート14の内部又はダイヤフラム16の表面又はその両方を伝搬する超音波65,66を減衰させる超音波減衰手段を設けた。