Development of High Temperature Neutron Flux Detectors

This technical report outlines the development of a new generation of neutron flux detectors (NFDs) designed for use in next generation nuclear reactors. These detectors are essential for monitoring core reactivity and ensuring safe operation under extreme conditions, including high temperatures and corrosive environments. The report details the challenges faced with existing NFDs, which are not suitable for the harsher conditions anticipated in future reactors. It describes the design and manufacturing process of the new NFD, which can operate at temperatures up to 800°C, and highlights the collaborative efforts of a specialized project team. The report also emphasizes the materials used in the NFD construction, such as Inconel 625, and the rigorous testing protocols employed to validate its performance. Furthermore, it discusses the anticipated benefits of the new NFD, including reduced manufacturing costs and extended operational lifespan, which are expected to facilitate advancements in reactor design and efficiency. The report concludes with plans for further testing and qualification of the NFD by the end of 2024.