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Hasegawa, Shoichi; Kato, Takashi; Aso, Tomokazu; Ushijima, Isamu*; Tatsumoto, Hideki; Otsu, Kiichi*; Ikeda, Yujiro
LA-UR-06-3904, Vol.2, p.402 - 407, 2006/06
In JSNS, the hydrogen of super critical state is adopted as moderators. Therefore the cryogenic hydrogen system is prepared, which consists of hydrogen circulating unit and transfer lines to moderators. The hydrogen system will immediately discharge hydrogen when an off-normal event occurs. In case of emergency, helium gas will be inputted to an insulation vacuum of the transfer line in order to enhance the heat transfer and the hydrogen discharge time should be shortened. Then, it is impotant to estimate the behaviour of pressure and velocity of discharging hydrogen in the emergency. During hydrogen discharge, the pressure rise in the discharge piping should be kept below the design pressure of 0.1 MPa. The result of analysis shows that the pressure of helium gas injection is suitable less than 0.04Mpa, and that the maximum hydrogen discharge flow is evaluated to be 0.047 kg/s after around 150 seconds. After five minutes with this condition, the hydrogen of around 90% in the moderator piping is discharged. Safety hydrogen release in the case of emergency can be established.
Aso, Tomokazu; Teshigawara, Makoto; Hasegawa, Shoichi; Muto, Hideki; Aoyagi, Katsuhiro; Nomura, Kazutaka; Takada, Hiroshi
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no abstracts in English
Aso, Tomokazu
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no abstracts in English
Aso, Tomokazu
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The deregulation of high-pressure gas equipment related to the cryogenic engineering field is progressing by the technological progress. On the other hand, in the design, structure, and operation of the equipment, the self-responsibility of business operators and operating equipment managers is being questioned. In addition, a wide variety of dangers in new technologies have been pointed out widely in industry. The Environment and Safety Committee meeting on technical risks and safety measures in the field of cryogenic engineering will be held with the "risk assessment" as a safety measure in mind. I will introduce the safety measures for the cryogenic hydrogen system for the neutron source operating at J-PARC's Materials and Life Science Experimental Facility as a field of hydrogen utilization in line with the chemical plant and space environment fields.