Fuel rod contact type measuring anti-collision structure and anti-collision method thereof

Abstract

The invention discloses a fuel rod contact type measuring anti-collision structure and an anti-collision method thereof. The fuel rod contact type measuring anti-collision structure comprises a base capable of sliding; a mounting block is arranged on the base and is connected with the base, a supporting slide block is arranged on the mounting block and can slide along the upper surface of the mounting block on the mounting block, and the sliding direction of the supporting slide block is the same as that of the base; a buffer mechanism is arranged on the supporting slide block and is connected with a measuring probe, the measuring probe can slide along with the buffer mechanism, and the sliding direction is the same as that of the supporting slide block. The fuel rod contact type measuring anti-collision structure and the anti-collision method thereof disclosed by the invention have the benefits that the anti-collision can be automatically realized; the pressure design increases step by step; the contact pressure can be limited within a safety range in the fuel rod contact type measuring process, so that not only is the larger moving range in the fuel rod contact type measuring process ensured, but also the contact pressure can be enabled not to damage the probe or a fuel rod.

Description

technical field [0001] The invention belongs to the field of pool edge inspection of irradiated fuel assemblies in the nuclear fuel cycle, and in particular relates to a fuel rod contact-type measurement anti-collision structure and an anti-collision method. Background technique [0002] Fuel assemblies work in high-temperature, high-pressure, and high-radiation circulating water. Due to the influence of assembly heat and thermal stress and other factors, it is easy to cause changes in the dimensions of fuel assemblies and fuel rods, making it impossible to return to the stack for reuse. As an effective means of evaluating the radiation stability and integrity of fuel assemblies, poolside inspection technology undertakes an important task to ensure the safe operation of nuclear power plants. [0003] Diameter measurement of fuel rods, oxide film thickness measurement and ultrasonic flaw detection are important components of poolside inspection technology. At present, the co...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing fuel rods are likely to be damaged due to collisions during contact measurement, which will directly cause the fuel rods to be unable to be returned to the stack for reuse, and follow-up work such as removal and replacement is required, which is not conducive to inspection The smooth development of the work brought huge economic losses, and provided a fuel rod contact measurement anti-collision structure and anti-collision method. The structure and method can automatically realize anti-collision, and the pressure design is gradually increased. The contact pressure is limited to a safe range during the rod contact measurement process, which not only ensures a large range of motion during the fuel rod contact measurement process, but also ensures that the contact pressure does not cause damage to the probe or fuel rod

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