Coaming bolt detection device for nuclear power plant

Abstract

The invention discloses a coaming bolt detection device for a nuclear power plant. The coaming bolt detection device for the nuclear power plant comprises a remote control system, an underwater operation platform and a cable connected between the remote control system and the underwater operation platform; the underwater operation platform comprises a buoyancy compartment, a camera holder, an ultrasonic probe tool rack, a plurality of vertical propellers and a plurality of horizontal propellers; the camera holder and the ultrasonic probe tool rack are arranged on one side of the buoyancy compartment; and spin axes of at least two of the vertical propellers are arranged in a splayed shape. The vertical propellers adopts the splayed layout, the underwater operation platform ascends and descends when the two propellers runs in the same direction at the same speed, and the lateral migration is implemented when only one propeller moves, so that the flexibility of the underwater operation platform is improved.

Description

technical field [0001] The invention relates to the field of nuclear power detection equipment, in particular to a nuclear power plant coaming bolt inspection device. Background technique [0002] The coaming assembly of a nuclear power plant is an important component of the reactor core. It is used to enclose the nuclear fuel assembly. Its working environment is complex, including high temperature, high pressure, strong neutron radiation and vibration. After long-term operation, the coaming bolts used as fasteners It is easy to produce radiation stress corrosion crack IASCC. Damaged coaming bolts will loosen the coaming connection and reduce the overall stiffness of the coaming assembly. Under the impact of the primary circuit coolant, the loose coaming assembly will cause damage to the nuclear fuel assembly. In the 1980s, the United States, France, Finland and other countries found damage and corrosion of the coaming bolts during the in-service inspection of their nuclear...

AI Technical Summary

Problems solved by technology

The main disadvantages of SURPEEM-ROSA V are: when the equipment is used, it needs to be assembled on site, and this process needs to occupy the mobile crane system in the nuclear island; The structure of the device is adjusted

The main disadvantages of MIDAS VI are: the position of the ultrasonic probe of this equipment cannot be adjusted in micro-motion, which is not conducive to the alignment between the ultrasonic probe and the coaming bolts; the cylindrical buoyancy chamber has poor ability to resist left and right swings; the equipment cannot perform lateral movement

The main disadvantages of Beihang's micro underwater robot are: the main structure of the equipment is made of polymer structure, which is prone to radiation embrittlement and fracture after a long time in the nuclear power environment; the equipment cannot perform lateral movement under water

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