| 摘要 |
PURPOSE:To provide high safety by sealing a hollow hole inside with coolant in place of metallic sodium. CONSTITUTION:Manufacturing process is simplified by sealing a hollow hole 5 inside with compressed powder body 6 of no danger, and even if the compressed powder body 6 flows out due to a damaged valve, no harm is given to a human body or the like, and the heat in a shade-shaped part is transmitted rapidly to a stem 3 through the compressed powder body 6.
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