Abstract
International Thermonuclear Experimental Reactor maintenance mission objectives and their effect on systems layout are reviewed through the example of the torus vacuum pumping systems. Applying maintenance requirements to this system has resulted in significant improvements in component accessibility. Further changes currently under review could result in a reduction in vacuum duct length, the addition of duct shielding to reduce neutron activation, a pump and valve assembly which can be serviced from the floor rather than solely from a crane, and provision for transport cacks to enter the pump room through an equipment airlock, large enough to permit the entry of robotic devices as well as construction equipment. This rearrangement could offers savings in overall height of the pump and valve assembly. An innovation in valve configuration will allow for on-line removal of the large vacuum valve seal discs without loss of vacuum. This has potential for reduced maintenance outage time and operating cost.
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