Electromagneitc Evaluations On Test Blanket Module Under Plasma Majior Disruptions

Test Blanket Module (TBM) is one of the important component in verifying thefeasibility of developing commercial and demonstration fusion reactor in theInternational Thermonuclear Experimental Reactor (ITER) plan. The main objective ofTBM is achieving tritium self-sustain, extract energy from the high temperatureenvironment, testing relevant procedure and design tool. Due to the plasma isconstrained in the environment of strong magnetic filed, if the plasma loses control andleads to disruption, the electromagnetic loads will be induced by the hugeelectromagnetic transients on TBM. It will bring risk to the stability and security ofITER. Therefore, the security of electromagnetic analysis is very important andnecessary in determining the security design of structure of TBM under the plasmatransients.Based on the Chinese solid breeder TBM, the safety study of electromagnetic onmajor disruption (MD) of plasma is researched in this paper. Firstly, the development ofHelium Cooled Ceramic Breeder TBM (HCCB TBM) and two characteristics of MDaccidental conditions are introduced and lay a foundation for later analysis. Secondly,by using the ANSYS software, a three-dimensional finite element model which includesall the electro-magnetic coils, HCCB TBM and the Frame structure is built. And Then,the electromagnetic loads such as the eddy currents and the Lorentz forces caused by theinteractions of the magnetic field with the eddy currents on TBM is evaluated bychoosing the liner and exponential decay of plasma currents as accident conditions.Thirdly, the Multidiscipline coupling analysis calculates the mechanical stress,deformation and temperature rise during the accidents on TBM. Finally, the calculatedresults are compared with the allowance range of material and structure, which showsthe current design of TBM satisfy the requirements of electromagnetic security.Moreover, due to the design of the HCCB TBM is not completely determine, thesensitivity analysis which compare the mechanical stress and deformation in different lengths of support cartridges is taken into account. It supplies the optimal reference forcurrent design.