| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of a stop plug having sufficiently high airtightness, no function defect caused by radiation irradiation, a small space for valve loading, and a function for confirming normal operation after stop valve operation. SOLUTION: This stop plug is formed by providing a low-melting-point metal tube having the same inner diameter as a pipe diameter in the middle of the pipe which is a closing object, and by arranging a metal mesh material for holding the tube, an outer container, a heater for heating the low-melting-point metal, and a thermocouple for confirming stop plug behavior. COPYRIGHT: (C)2006,JPO&NCIPI
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