Ball cone irradiation sample stopple with self-locking pressurized water reactor

Abstract

The invention belongs to nuclear power plant pressurized water type reactor structure technology, and particularly discloses a ball cone irradiation sample stopple with a self-locking pressurized water reactor. The stopple is composed of an upper end head, a substrate, an optical shaft, a water pressure pushing rod, a cone ring, a ball, a locknut and two springs, wherein the upper end head is positioned at the upper end of the substrate, the spring is arranged in the substrate, the cone ring is positioned at the lower end of the substrate, the water pressure pushing rod penetrates the center of the cone ring and enters the inner cavity of the substrate, the cone surface of the cone ring is fitted with the ball, and the two springs are mounted outside the water pressure pushing rod in a sleeving manner. The cone ring and the ball are mounted below the substrate, and the ball and the cone ring are tightly fitted, through the adoption of the designed pushing rod structure, and the cone surface pushes the ball outwards to ensure that the ball and the wall of an irradiation sample hole are locked automatically. The irradiation sample stopple is simple and not high in processing precision, and can not be affected by cold water long term corrosion in operation process. Higher safety margin can be obtained after uniform loading of a plurality of balls, and the additional arrangement of the overload protection structure can further improve safety.

Description

technical field [0001] The invention belongs to the structural technology of pressurized water nuclear reactors in nuclear power plants, and in particular relates to a hole plug for irradiation samples. Background technique [0002] An irradiation sample rack is arranged on the hanging basket cylinder of the internal components of the pressurized water reactor. The sample material placed in the irradiated sample rack is exactly the same as that of the reactor pressure vessel, so that it can be taken out at different stages of the reactor life for mechanical performance tests. Correspondingly, a hole is opened on the flange of the hanging basket corresponding to the position of the irradiated sample rack, so that the irradiated sample can be disassembled later with a special long-rod tool. In order not to generate additional side flow, the irradiated sample is placed at the opening position The hole plug plays the role of restricting the bypass flow during the operation of t...

AI Technical Summary

Problems solved by technology

[0003] At present, the irradiated sample hole plug of pressurized water reactor is composed of an upper end, a base, an optical axis and a spring, see the attached figure 1 , this structure has no self-locking function. After the upper reactor internals that press the irradiated sample hole plug are disassembled, the irradiated sample hole plug is washed by the primary loop coolant when the reactor safety injection test or failure occurs. The possibility of randomly scattered in the reactor, there is a big hidden danger

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