Development of under sodium viewer for next generation sodium-cooled Fast reactor; Imaging test in sodium

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

Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 7 Pages, 2019/05

Inspection technique in opaque liquid metal coolant is one of important issues for sodium-cooled fast reactors. Various under sodium viewers (USVs), including horizontal USVs for obstacle detection and imaging USVs, have been developed in several research institutes and countries. We aim practical realization of imaging USV which 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 of a receiving sensor. An issue for the sensitivity improvement of the receiving sensor is the sound pressure propagation inside the receiving sensor. Prototype tests in the water and sodium were conducted in order to resolve the issue. In addition, imaging experiments in the water and sodium were conducted using the improved receiving sensor. From the results of imaging experiments, the relation between obtained wave profile and the regeneration imaging was confirmed.

Studies on maintainability and repairability for Japan Sodium-cooled Fast Reactor (JSFR)

Isono, Kenichi; Kubo, Shigenobu; Chikazawa, Yoshitaka; Dozaki, Koji*; Oya, Takeaki*; Yui, Masahiro*

Proceedings of 22nd International Conference on Nuclear Engineering (ICONE-22) (DVD-ROM), 7 Pages, 2014/07

https://doi.org/10.1115/ICONE22-30175

Aiming at enabling maintenance and repair of almost all components in JSFR demonstration reactor to a level equivalent to that attained for the light water reactors, we identified a number of parts which have difficulty in maintenance and repair in main components of the reactor structure and the primary/secondary main coolant system. And we defined the criteria for design improvement and then provided candidates of improvement measures for the identified parts. Furthermore, we made a modification of the plant design in a consistent manner integrating the improvements investigated for each major component. A series of evaluations were conducted to check the feasibility as a power plant. As the result, we found that the concept could be adopted not only to the demonstration reactor (750 MWe) but to the commercial one (1500 MWe).

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.

Development of under sodium viewer for sodium-cooled fast reactor

Aizawa, Kosuke; Yui, Masahiro*; Hiramatsu, Takashi*

no journal, , 

We have developed under sodium viewer for sodium-cooled fast reactor. In particular, the receiving sensor and the transmission sensor has been developed. In addition, we have aimed a proficiency of an acoustic technology under sodium. Moreover, imaging experiments in the water and the sodium were conducted using the developed transmission and the developed receiving sensor. In this study, we will explain the developmental status.

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*; 加藤 潤悟*; 植本 洋平*

JP, 2015-059268  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とダイヤフラム16との間に、耐熱性を有し超音波を反射する伝搬防止板18を設けた。