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Underwater turnover mechanism of fuel assembly

A technology of overturning mechanism and fuel assembly, which is applied in the direction of reactor fuel elements, reactors, and reduction of greenhouse gases, etc. It can solve the problems that the processing process of radioactive fuel assemblies cannot be satisfied, and there is no precedent for the decommissioning of heavy water research reactors. It achieves a simple structure and satisfies the rotation position. Requirements, safe and reliable operation

Active Publication Date: 2013-01-09
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no precedent for the decommissioning of heavy water research reactors in China, and the fuel assemblies of pressurized water reactors are completely different from those of heavy water research reactors. The existing turning mechanism cannot meet the processing process of radioactive fuel assemblies.

Method used

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  • Underwater turnover mechanism of fuel assembly
  • Underwater turnover mechanism of fuel assembly
  • Underwater turnover mechanism of fuel assembly

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Experimental program
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Embodiment Construction

[0014] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0015] A fuel assembly underwater turning mechanism, such as figure 1 , 2 As shown, it is mainly composed of an annular baffle 6, a drive rod 10, a sleeve 2, an end cover 1, a ratchet 4, a pawl 12, a non-return pawl 3, a bracket 5, a pull rod 7, a positioning pin 11, and a positioning shaft 9 , the sleeve 2 and the ratchet 4 are installed on the bracket 5 through the positioning shaft 9 , the sleeve 2 and the ratchet 4 are fixed together and can rotate synchronously around the positioning shaft 9 . The annular baffle 6 with the upper opening is fixed on the bracket 5, and the axis of the annular baffle 6 coincides with the axis of the ratchet 4, that is, the annular baffle 6 and the ratchet 4 are coaxial, so that the end cap connected to the sleeve 2 can be guaranteed 1 always keeps the same distance from the ring baffle 6 during the rotation....

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Abstract

The invention discloses an underwater turnover mechanism of a fuel assembly, which comprises an annular baffle plate, a driving rod, a sleeve, end covers, a ratchet wheel, a pawl, a check pawl, a bracket, a pull rod, a positioning pin and a positioning shaft, wherein the annular baffle plate is fixed on the bracket, the sleeve and the ratchet wheel are arranged on the bracket through the positioning shaft, and the axis of the annular baffle plate is superposed with the axis of the ratchet wheel; the right upper end of a vertical hole of the positioning shaft is provided with a guide sleeve; the positioning pin can fall into the vertical hole of the positioning shaft along the guide sleeve; the positioning pin is connected on the pull rod; the end covers are arranged at two ends of the sleeve; and the driving rod is connected with the pawl. The invention provides the underwater turnover mechanism of the fuel assembly, which has simple structure and reliable action, is convenient to install, is turned over in deep water and meets the spatial requirements.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor engineering, in particular to an underwater turning mechanism for a fuel assembly. Background technique [0002] During the decommissioning process of the heavy water research reactor, the fuel assembly needs to be turned over in a certain underwater space, which requires a reliable operation process and is conducive to the radiation protection of the operator. At present, there is no precedent for the decommissioning of heavy water research reactors in China, and the fuel assemblies of pressurized water reactors are completely different from those of heavy water research reactors. The existing turning mechanism cannot meet the processing process of radioactive fuel assemblies. Contents of the invention [0003] The invention overcomes the deficiencies in the prior art, and provides a fuel assembly underwater turning mechanism with simple structure, convenient installation, reliable acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C19/00G21C19/375G21C19/10
CPCY02E30/30
Inventor 衣大勇张金山黄兴蓉庄毅姚成志
Owner CHINA INSTITUTE OF ATOMIC ENERGY