X-Sentry Inc. is a company founded by PhD and master’s researchers from the Departments of Nuclear Engineering at Seoul National University and KAIST, developing sensor solutions capable of operating in the extreme conditions (high temperature, high corrosion, high pressure, and high radiation) of next-generation non-light-water SMRs. The company is currently focused on the rapid development of three core sensors—a cover gas composition sensor, a nuclear material concentration sensor, and a corrosion environment monitoring sensor—with the goal of establishing strong global references.