Research on a New Type of High Temperature C-shaped Ring for Reactor Pressure Vessels
The C-shaped sealing ring is the core component that ensures the sealing of the pressure vessel in nuclear power plants,and its sealing performance is directly related to the safe and stable operation of nuclear power plants.At present,the commonly used C-shaped ring in nuclear power plants is a sealed layer coated with silver.However,the usage temperature of the silver coated C-shaped ring is generally limited to below 400 ℃.For a new type of high-temperature nuclear power unit reactor pressure vessel with a design temperature of up to 550℃ and multiple cold and hot temperature cycling conditions,this paper introduces the main structural materials,manufacturing process,and technical key of a new type of nickel coated C-shaped ring,and conducts various cold and hot comprehensive performance tests on the new nickel coated C-shaped sealed sample ring at room temperature and high temperature.The experimental results show that the leakage rate of the new nickel coated high-temperature C-shaped sealing ring studied can reach ≤5.0×10-6 Pa·m3/s at a high temperature of 550 ℃,which can be used for the engineering application of metal static sealing rings at 550℃ in nuclear power plants and other engineering fields.
nuclear power plantsnickel coatinghigh temperaturesealing ringresearch