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Journal Articles

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.

Oral presentation

Study on inspection and repair technologies toward the demonstration reactor of JSFR, 1; Project summary

Yamashita, Takuya; Ueda, Masashi; Yamaguchi, Toshihiko; Tagawa, Akihiro; Uemoto, Yohei*; Tsujita, Yoshihiro*

no journal, , 

We are studying in service inspection of JSFR in reactor vessel and steam generator tubes. This paper describes that development of under sodium inspection in reactor vessel.

Oral presentation

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.

Oral presentation

Development of under sodium viewer, 2; Imaging test in water

Yui, Masahiro*; Uemoto, Yohei*; Kurokawa, Masaaki*; Taniguchi, Yoshihiro*; Chikazawa, Yoshitaka; Aizawa, Kosuke; Ara, Kuniaki

no journal, , 

Inspection technique in opaque liquid metal coolant is one of the important issues for safety warranty of Liquid Metal Fast Breeder Reactor (LMFBR) core. To facilitate operations and maintenance activities, an under sodium viewer (USV) has been developed. In this study, the receiving sensitivity of the USV was increased by adopting the structure which can reduce the noise in the receiving sensor. In addition, it was confirmed that the developed sensor has the targeted performance.

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