Nuclear Reactor Pressure Vessel is an important equipment of a nuclear power plant The pre-service and in-service inspection of the pressure vessel is clearly demanded in ASME code, RSEM code and nuclear safety guide issued by Nuclear Safety Bureau of China. The inspection result is the evidence to testify the integrity of the reactor pressure vessel and one of the key items on the safety evaluation about nuclear power plants. The nuclear reactor pressure vessel inspection machine is a complicated integrative electromechanic system. This system is a large remote control roboticized system consisting of high precision mechanical construction, electronic drag and control, advanced ultrasonic inspection technologies and computer technologies.
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