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The Large scale distributed system is constructed over long period of time step by step. Even under the construction, on-line operation is started in its system. Afer starting on-line operation, it continuously has to be tested and maintained in various area without stopping on-line operation. On the conventional on-line test technique on Autonomous Decentralized System, the on-line and the test data exist concurrently in the same system. The real-time response of on-line system is not assured.In this Paper, by clustering testlon-line subsystems and controlling data flow among each cluster autonomously, each different type of subsystem is isolated and protects perturbation from the other subsystem. The reliability and real time response of on-line system is assured.

Japan Atomic Energy Research Institute is constructing the International Thermonuclear Experimental Reactor common test facility for the Central Solenoid Model Coil which is around 180 tons, a forced-flow cooled magnet with the maximum pulsed operation of 2 T/s and generates the rated magnetic field of 13 T at 48 kA with stored energy of 668 MJ. The test facility consists of a coil vacuum chamber, a cryogenic system with the 5-kW refrigerator and 500-g/s cryogenic pump, two pairs of 50-kA current leads, two DC power supplies (50kA and 60kA) and two JT-60 pulsed power supplies (50 kA, k4.5 kV and k40 kA, k1.5 kV). The facility will be demonstrating the refrigeration and operation of a fusion pulsed magnet and the design and construction mill accumulate experience towards the construction of ITER.

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