Mechanical characteristics and seismic response of divertor support structure with locking system

A full-scale divertor support structure with hydraulic jacks was fabricated, and mechanical and seismic loading tests were carried out. This mock-up structure has four hydraulic jacks for locking the divertor plate and three jacks for lifting. The weight of the divertor plate model is 1.2 tons, similar to practical plate. The mechanical test results show that the divertor locking system provides high positioning tolerance within 0.3 mm and 0.2 mm in the toroidal and vertical directions respectively. To confirm the seismic response of the hydraulic cotter, a dynamic loading test was carried out. The fundamental frequency of 27 Hz is the mode of toroidal direction vibration, and is relatively high compared with the predominant earthquake frequencies. No damage of the hydraulic jacks appears under seismic loads. According to the results of mechanical and dynamic loading tests, the feasibility of the divertor support structure is verified. (orig.)