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Takahashi, Naoki; Yoshinaka, Kazuyuki; Harada, Akio; Yamanaka, Atsushi; Ueno, Takashi; Kurihara, Ryoichi; Suzuki, Soju; Takamatsu, Misao; Maeda, Shigetaka; Iseki, Atsushi; et al.
Nihon Genshiryoku Gakkai Homu Peji (Internet), 64 Pages, 2016/00
no abstracts in English
Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.
JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09
Miyahara, Shinya; Ishikawa, Hiroyasu; Yoshizawa, Yoshio*
Nuclear Engineering and Design, 241(5), p.1319 - 1328, 2011/05
Times Cited Count：13 Percentile：69.64(Nuclear Science & Technology)Reaction behavior of carbon dioxide (CO
) with a liquid sodium pool was experimentally investigated to understand the consequences of boundary tube failure in a sodium-CO heat exchanger (HX). In this study, two kinds of experiments, namely fundamental experiment and demonstration experiment which simulate the incident of CO leakage in HX, were carried out to investigate the reaction behavior. From these experiments, it became clear that the exothermic reaction occurred above a threshold temperature, and useful and indispensable information such as the resulting temperature and pressure rise and the behavior of solid reaction products in the pool was obtained to evaluate the consequences of boundary tube failure incident in the sodium- CO heat exchanger.
Miyahara, Shinya; Ishikawa, Hiroyasu; Yoshizawa, Yoshio*
Proceedings of 17th International Conference on Nuclear Engineering (ICONE-17) (CD-ROM), 8 Pages, 2009/06
Reaction behavior of carbon dioxide (CO) with a liquid sodium pool was experimentally investigated to understand the consequences of boundary tube failure in a sodium-CO heat exchanger. In this study, two kinds of experiments were carried out to investigate the reaction behavior. In one experiment, about 1-5 g of liquid sodium pool were poured into flowing CO to obtain the information mainly about the thermo-chemical conditions to initiate the reaction and the chemical constituents of reaction products. During the experiment, visual observation was made using video-camera and the temperature change of the sodium pool and near the surface was measured by thermocouples. In the other experiment, CO was injected into about 200 g of liquid sodium pool to simulate the boundary failure in the sodium-CO heat exchanger. The temperature change of sodium pool and the cover gas was measured by thermocouples during the experiment. From these experiments, it became clear that the exothermic reaction occurred above a threshold temperature, and useful and indispensable information such as the resulting temperature and pressure rise and the behavior of solid reaction products in the pool was obtained to evaluate the consequences of boundary tube failure incident in a sodium-CO heat exchanger.
Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 7(4), p.452 - 461, 2008/12
Supercritical CO is being investigated as a material for a secondary cooling system of Na-cooled fast reactor in to avoid Na/water reaction. In this type of reactor, however, it is necessary to consider the consequences of Na/CO reaction, which might occur in the case of tube rupture in a heat exchanger between primary and secondary systems. Experiments were carried out with test equipment for the Na/CO reaction, which can handle 1-5 g order of Na. The solid products of the Na/CO reaction sampled from the equipment were analyzed by XRD and chemical analysis. From these experimental results, we proved that the reaction proceeded between liquid Na and CO. The Na/CO reaction stopped only the pool surface reaction with a small quantity of aerosol emission when the temperature was lower than 570
C. On the other hand, the reaction continuously proceeded with on orange-colored flame and aerosol release when the temperature was higher than 580C.
Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio*
Proceedings of 2005 International Congress on Advances in Nuclear Power Plants (ICAPP '05) (CD-ROM), P. 5688, 2005/05
Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.
gas turbine fast reactor, 6; Experimental study of sodium-carbon dioxide reaction, 2Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio
no journal, ,
Supercritical carbon dioxide (CO) is being investigated as a material for a secondary cooling system of sodium (Na) cooled fast reactor in order to avoid Na/water reaction. In this type reactor, however, it is necessary to consider the consequences of Na/CO reaction which might occur in the case of tube rupture in a heat exchanger between primary and secondary systems. Experiments were carried out with test equipment for Na/CO reaction and measured temperatures by thermocouples, which can handle 1-5g order Na. The solid products of Na/CO reaction sampled from the equipment were analyzed by X-ray diffraction (XRD) and chemical analysis. The parts of exhaust gases were analyzed by gas chromatography. From these experimental results, we proved that the reaction was generated between liquid Na and CO.
Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio*
no journal, ,
no abstracts in English
Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio*
no journal, ,
no abstracts in English
Ishikawa, Hiroyasu; Miyahara, Shinya; Yoshizawa, Yoshio*
no journal, ,
no abstracts in English
