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Oral presentation

Development of balloon pressure control device for observing the complete small intestine using an ileus tube type endoscope

Seki, Takeshi; Naganawa, Akihiro*; Oka, Kiyoshi; Sato, Noriyasu*; Yoshino, Junji*

no journal, , 

The double-balloon and capsule endoscopes are difficult to use such endoscopes in patients who suffer from intestinal obstruction and adhesion. We have developed a new endoscope that can be used in patients who suffer from these problems; the device consists of an ileus tube and an optical fiberscope (1.1 mm in diameter). When this endoscope is removed from the body at a constant speed, the entire small intestine can be observed by controlling the internal pressure of balloons of the ileus tube to sufficiently maintain the state of the bowel. In this research, we developed a device to control the internal pressure of the balloon to facilitate the observation of the entire small intestinal area. The internal pressure control device developed by us consists of an ileus tube, a medical syringe, a motor, a pressure sensor, and so on. The medical syringe is used to control the balloon's internal pressure by pushing and pulling the plunger using the motor. To realize a very accurate control performance, we incorporated a two-degrees-of-freedom control system to control the balloon internal pressure. We experimented on three aspects of the device to evaluate its performance (Reference response property, Disturbance rejection property and Maintenance of pressure level). These results suggested that it is possible to remove the ileus tube from the small intestine at a constant speed.

Oral presentation

New Reactor Cavity Cooling System (RCCS) having passive safety features, 2; Experimental study on heat transfer characteristics using a scale model

Sato, Noriyasu*; Yamaguchi, Shuhei*; Matsumoto, Tatsuya*; Morita, Koji*; Takamatsu, Kuniyoshi

no journal, , 

After Fukushima Daiichi nuclear disaster by TEPCO, a cooling system to prevent core damage became more important from the perspective of defense in depth. Therefore, a new, highly efficient RCCS with passive safety features without a requirement for electricity and mechanical drive is proposed. Employing the air as the working fluid and the ambient air as the ultimate heat sink, the new RCCS design strongly reduces the possibility of losing the heat sink for decay heat removal. The RCCS can always stably and passively remove a part of the released heat at the rated operation and the decay heat after reactor shutdown. Last year, we built the scale-down heat removal test facility and now conduct experiments to understand the heat-transfer characteristics. As a result, we could assess effect of radiation quantitatively for passive decay heat removal from the RPV.

Oral presentation

Study on heat transfer characteristics of reactor cavity cooling system with passive safety features; Experimental investigation using a scaled model

Yamaguchi, Shuhei*; Sato, Noriyasu*; Matsumoto, Tatsuya*; Morita, Koji*; Takamatsu, Kuniyoshi

no journal, , 

After Fukushima Daiichi nuclear disaster by TEPCO, a cooling system to prevent core damage became more important from the perspective of defense in depth. Therefore, a new, highly efficient RCCS with passive safety features without a requirement for electricity and mechanical drive is proposed. Employing the air as the working fluid and the ambient air as the ultimate heat sink, the new RCCS design strongly reduces the possibility of losing the heat sink for decay heat removal. The RCCS can always stably and passively remove a part of the released heat at the rated operation and the decay heat after reactor shutdown. In 205, we built the scale-down heat removal test facility and now conduct experiments to understand the heat-transfer characteristics. As a result, we could assess effect of radiation quantitatively for passive decay heat removal from the RPV.

Oral presentation

An Experimental investigation on heat transfer characteristics using a scaled model of a reactor cavity cooling system with passive safety features

Yamaguchi, Shuhei*; Sato, Noriyasu*; Matsumoto, Tatsuya*; Morita, Koji*; Takamatsu, Kuniyoshi

no journal, , 

After Fukushima Daiichi nuclear disaster by TEPCO, a cooling system to prevent core damage became more important from the perspective of defense in depth. Therefore, a new, highly efficient RCCS with passive safety features without a requirement for electricity and mechanical drive is proposed. Employing the air as the working fluid and the ambient air as the ultimate heat sink, the new RCCS design strongly reduces the possibility of losing the heat sink for decay heat removal. The RCCS can always stably and passively remove a part of the released heat at the rated operation and the decay heat after reactor shutdown. Last year, we built the scale-down heat removal test facility and now conduct experiments to understand the heat-transfer characteristics. As a result, we could assess effect of radiation quantitatively for passive decay heat removal from the RPV.

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