Source positioning device for radiographic inspection of welding seam of electric heating element of voltage stabilizer
An electric heating element, radiographic inspection technology, applied in nuclear power generation, material analysis using radiation, nuclear reactor monitoring, etc., can solve problems such as difficulty in identifying defects, low work efficiency, and difficulty in accurate positioning and installation of radioactive sources and films.
Pending Publication Date: 2021-12-07
CHINA NUCLEAR POWER OPERATION TECH
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Problems solved by technology
[0005] During the in-service inspection, the radiation dose at the bottom of the voltage stabilizer was as high as several millisieverts. The conventional method of inspection, using adhesive tape or elastic rope to fix the negative film cassette and source conduit, required several people to complete the inspection, not only The overall exposure dose is high and the work efficiency is low
Various cables at the bottom of the voltage stabilizer are criss-crossed, and the operating space and observation range of personnel are very limited. It is difficult to ensure the accurate positioning and installation of radioactive sources and films, resulting in distortion of weld images and difficult identification of defects. Get the ideal film quality
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[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] A source positioning device for radiographic inspection of welding seams of voltage stabilizer electric heating elements provided by the present invention includes an active positioning frame 1, an upper component 2, a rubber gasket 3, a film tray 4, a positioning screw 5, a pressing block 6, a support Base 7, wing nut 8 and two-way screw rod 9.
[0024] like figure 1 As shown, the film tray 4 is provided with a compression block 6, and the film tray 4 is also provided with a support base 7, one end of the two-way screw 9 passes through the support base 7 and is connected with the compression block 6, and the other end of the two-way screw 9 is connected to the butterfly Shaped nut 8 is connected, the film tray 4 is connected with the upper component 2 through the set screw 5, the upper component 2 is provided with a rubber ga...
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The invention discloses a source positioning device for radiographic inspection of a welding seam of an electric heating element of a voltage stabilizer which comprises a film tray, a pressing block is arranged on the film tray, a supporting base is further arranged on the film tray, one end of a two-way screw penetrates through the supporting base to be connected with the pressing block, the other end of the two-way screw is connected with a butterfly nut, the film tray is connected with an upper component through a positioning screw, and the source positioning frame is connected with the upper component. The device has the beneficial effects that the working efficiency can be improved, and the irradiation dose can be reduced.
Description
technical field [0001] The invention belongs to a radiation inspection device, in particular to a source positioning device for the radiation inspection of a welding seam of an electric heating element of a voltage stabilizer. Background technique [0002] The reactor coolant system is the core system within the pressure boundary of the primary circuit of a nuclear power plant, and its normal operation plays a vital role in nuclear safety. The pressure increase of the coolant system is mainly completed by 63 electric heating elements in the lower part of the voltage regulator. The expected life of the electric heating element is about 20 years, which is less than the overall operating life of the nuclear power plant. Therefore, each electric heating element needs to be replaced individually during the maintenance period of the nuclear power plant. [0003] The 63 electric heating elements are all arranged on three concentric circles with diameters of 1320.8mm, 1092.2mm and ...
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IPC IPC(8): G01N23/04G21C17/00
CPCG01N23/04G21C17/00Y02E30/30
Inventor 张亮毕海波孙武李世伟黄超严军伟
Owner CHINA NUCLEAR POWER OPERATION TECH