As an emerging energy, nuclear power plant is featured with environmental-friendliness and high efficiency and attracts a lot of attention due to radiation brought by its power supplies. Door, as a channel connecting the nuclear power plant with outside, plays roles of room divider, seal, zoning, personnel access and so on. There are many internal rooms in the nuclear power plant with different functions and characteristics. The special door of the nuclear power plant is the final barrier for blocking internal rays, airflow and other pollutants in the nuclear power plant from connecting the outside. The construction quality of the powered door directly affects the quality of the last line of defense, and is more related to safety running of the nuclear power plant.
Since American ‘9.11’ event, and aimed at the powered doors of nuclear power plants, it is requested that each door should have solid steel plates with a thickness of at least 152 mm, the side length of the door panel should be more than 4m, the net weight should be more than 30T, and moreover, the door should meet the special requirements of fire resistance, explosion resistance, bullet resistance, shock resistance and so on. This is the first powered door adopting such high requirements and large size in the world, thus, both the manufacturing difficulty and test difficulty are great.