Reactor coolant pump centering device and method

The invention belongs to the field of nuclear power engineering of nuclear power stations, and particularly relates to a reactor coolant pump centering device and method.The reactor coolant pump centering device comprises a centering device support, a connecting device, a dial indicator adjusting rod and a dial indicator, the connecting device is located below the centering device support, and the connecting device is fixedly connected with the centering device support; the dial indicator adjusting rod is slidably connected with the connecting device, and the dial indicator is installed on the dial indicator adjusting rod. The device is simple and light in structure and easy to mount and dismount, the coaxiality and parallelism of the reactor coolant pump and the motor can be verified and adjusted, meanwhile, the procedures of dismounting and mounting an oil tank cover on the upper portion of the motor, turning and the like are avoided, occupation of a ring crane in a nuclear reactor hall in the nuclear react