Neutronics Shield Experiment for ITER at the Frascati Neutron Generator FNG

Publisher Summary Radiation loads are critical issues for the International Thermonuclear Experimental Reactor (ITER) shielding design. Limits on radiation induced displacement damage, insulator dose, and He production are imposed for all components assumed to be permanent or semi-permanent, that is, the toroidal field coil, the vacuum vessel, the blanket backplate, and the coolant manifold. Limits on the nuclear heating of the toroidal field magnet are also imposed. Radiation loads to ITER components are routinely calculated by using current state-of-the-art neutron, photon transport codes, and nuclear data, such as the Monte Carlo code and the fusion evaluated nuclear data library cross-section data file. A neutronics bulk shield experiment has been initiated by Frascati Neutron Generator with the main objective to validate the shielding performance of the ITER predicted by calculations. This chapter discusses the results of this experiment, that provide experimental data on the relevant nuclear quantities on a mock-up of the ITER inboard shield where the critical loads are found.