Maintenance method for tokamak fusion reactors with downward access to torus inboard structures.

概要

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A concept of tokamak fusion reactor maintenance is presented. Reactor structures and maintenance machines are arranged so that the component inside a shielding structure can be replaced through the hatches located on the upper side of the torus shielding structure. The plasma vacuum boundary is constituted by the inside wall of the shielding structure. The magnet vacuum chamber contains two toroidal magnets in a single room, so that strong support structures can be placed between these toroidal magnets. A merit of this reactor is that the inboard reactor structures are accessible with keeping the magnet cryogenic condition and without disassembling any major reactor components. The practicability of this method will depend on the time required to move the blanket segments in the toroidal direction and to weld pipes by remote handling. A number of ideas for reducing this time are presented,
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