Radiation-Tolerance Qualification for Maintenance Tasks in the future fusion reactor: the FBG radiation tolerance assessment as case study

The radiation-tolerance assessment of components is required before their use in instrumentation links for the future International thermonuclear fusion reactor (ITER). In this paper, we will detail our methodology to find the most suitable components with regard to the specific ITER requirements and to evaluate the radiation-tolerance of components for the ITER instrumentation links. Our approach aims to identify and describe the main failure mechanisms, to build a radiation-tolerant component database and to develop component validation procedures, a first step towards ITER-dedicated quality assurance procedures for the radiation-tolerance assessment. We illustrate it by considering the in-fibre Bragg grating filter as case study. We summarise our gamma and mixed gamma-neutron irradiation. Finally, we propose a component validation procedure, as first step towards ITER-dedicated quality assurance procedures for the radiation-tolerance assessment of wavelength-selective fibre optic components