AP1000 upper and lower flywheels: The tungsten-based high specific gravity alloy produced by our company is used in the main pump of the cooling system used in Generation 3+ nuclear power plants. Due to its high density and performance, it is installed in the main pump of the nuclear power cooling system after precision machining. It is used as an inertial flywheel to ensure that the main pump system can continue to work to cool the nuclear power plant to avoid accidents when the nuclear power plant suddenly loses power.