Nuclear power plant steam generator heat transfer tube stabilizing device and method

The invention provides a nuclear power plant steam generator heat transfer pipe stabilizing device and method, the stabilizing device comprises a connecting mechanism and at least one expansion mechanism, and the connecting mechanism is arranged in a target heat transfer pipe in a penetrating mode in the axial direction of the target heat transfer pipe; one end of the expansion mechanism is fixedly arranged on the connecting mechanism, the radial size of the other end of the expansion mechanism is adjustable, the expansion mechanism is located in the target heat transfer pipe, and the outer wall of the expansion mechanism abuts against the inner wall of the target heat transfer pipe in the working state of the target heat transfer pipe. According to the nuclear power plant steam generator heat transfer pipe stabilizing device, the connecting mechanism and the expansion mechanism are arranged in the heat transfer pipe, and when the heat transfer pipe is in the working state, the outer wall of the expansion mec