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(ITERP/20) Dielectric Properties of the ITER TFMC Insulation after Low Temperature Reactor Irradiation

K. Humer¹⁾, H. W. Weber¹⁾, R. Hastik²⁾, H. Hauser²⁾, H. Gerstenberg^3)
 
1) Atominstitut der österreichischen Universitäten, A-1020 Wien, Austria
²⁾ Institut für Werkstoffe der Elektrotechnik, TU Wien, A-1040 Wien, Austria
³⁾ TU München, FRM Reaktorstation, D-85748 Garching, Germany

Abstract.  The insulation system for the Toroidal Field Model Coil of ITER is a fiber reinforced plastic (FRP) laminate, which consists of a combined Kapton/R-glass-fiber reinforcement tape, vacuum-impregnated with an epoxy DGEBA system. Pure disk shaped laminates, disk shaped FRP/stainless-steel sandwiches, and conductor insulation prototypes were irradiated at 5 K in a fission reactor up to a fast neutron fluence of 10²²m^{- 2} ( E > 0.1MeV) to investigate the radiation induced degradation of the dielectric strength of the insulation system. After warm-up to room temperature, swelling, weight loss, and the breakdown strength were measured at 77 K. The sandwich swells by 4% at a fluence of 5×10²¹m^{- 2} and by 9% at 1×10²²m^{- 2}. The weight loss of the FRP is 2% at 1×10²²m^{- 2}. The dielectric strength remained unchanged over the whole dose range.

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