| 摘要 |
PROBLEM TO BE SOLVED: To provide a passive reactor shutdown mechanism usable for a gas- cooled reactor. SOLUTION: A top plate 2 is provided on the upper end of a control rod drive shaft 1, a penetration hole is opened in the center of a control rod 4 to put through the control rod drive shaft 1, the control rod 4 is hung from the top plate 2 by way of a connection pin 5. A thermal expansion tool 6 is pinched between the control rod 4 and the top plate 2. When the surrounding becomes a high temperature, the thermal expansion tool 6 pushes the control rod 4, breaks the connection pin 5 and lets the control rod 4 fall in the core.
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