The invention discloses a
visual test device for simulating high-temperature and high-pressure working conditions of a
nuclear reactor core rod bundle channel prototype, the device is provided with a
core test layer and a multi-stage depressurization layer, and a
core test layer window on the side surface of the
core test layer is sealed and insulated by using a sealing ring and an insulating spacer; an
electric heating rod bundle is arranged in the core test layer; the multi-stage
pressure reduction layer is formed by coaxially arranging a plurality of cylindrical
pressure reduction layer windows outside the core test layer; circulating cooling water with stable pressure is respectively introduced into the core test layer and each
pressure reduction layer, the pressure of each path of circulating cooling water is different, and the
pressure difference of the two sides of each window is within the window material pressure bearing range; circulating cooling water in each pressure reduction layer is kept at a single-phase low temperature, so that
visual observation is facilitated, and the temperature of the sealing material is ensured to be lower than the
temperature resistance limit. According to the invention, the key technical problems of material strength limitation and
thermal expansion mismatch in the high-temperature and high-pressure
visualization test are solved, and a reliable
test platform is provided for the high-temperature and high-pressure
visualization of the reactor core rod bundle channel prototype.