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Device and method for simulating diffusion and collection of tiny gas at crevasse in offline sipping of fuel assembly

A technology for simulating fuel assemblies and gas diffusion. It is used in the reduction of greenhouse gases, the measurement of radiation, and climate sustainability. It can solve problems such as the increase in internal and external pressure differences, and achieve high reduction degree, high safety and economy. Design small-scale effects

Active Publication Date: 2020-08-11
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This online sipping device has high requirements on the environment for sipping, that is, it must be completed during the unloading process, and the power to promote the release of the fission gas 133Xe from the damaged port of the fuel rod is only the fuel assembly in the core and in the refueling pool The height change of the fuel rod increases the internal and external pressure difference of the fission gas in the fuel rod

Method used

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  • Device and method for simulating diffusion and collection of tiny gas at crevasse in offline sipping of fuel assembly
  • Device and method for simulating diffusion and collection of tiny gas at crevasse in offline sipping of fuel assembly

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in detail:

[0017] like figure 1 As shown, the present invention is a device for simulating the diffusion and collection of tiny gas at the break in the off-line sipping of fuel assemblies, including a rod core 101, an inner cylinder 102 and an outer cylinder 105, wherein the rod core 101 is used for simulating fuel element pellets, and the rod The core 101 is placed in the inner cylinder 102, and the inner cylinder 102 is used to simulate the gas space containing fission gas inside the fuel element; the side of the inner cylinder 102 is provided with a breach opening and closing device 103, which is used to simulate the breach of the fuel element; The bottom of 102 is connected to the multi-purpose gas system; the outer cylinder 105 simulating the water circuit, and the inner cylinder 102 for simulating fuel elements are placed inside, and the outer cylinder 105 i...

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Abstract

A device for simulating diffusion and collection of tiny gas at a crevasse in offline sipping of a fuel assembly comprises an inner cylinder for simulating a fuel element and an outer cylinder for simulating a water loop. A rod core for simulating a fuel element pellet is arranged in the inner cylinder, and the inner cylinder is filled with tracing gas. The outer cylinder contains water and the inner cylinder, and the outer cylinder can control the temperature and pressure of a water bath environment. A crevasse opening and closing device is arranged between the inner cylinder and the outer cylinder, so that under-pressure locking, crevasse opening and crevasse size changing of crevasses can be realized, and simulation of offline sipping processes of fuel elements with different damage degrees can be realized.

Description

technical field [0001] The invention relates to the field of sipping during reactor shutdown and refueling, in particular to a device and method for simulating the diffusion and collection of microscopic gas at breaches in off-line sipping of fuel assemblies. Background technique [0002] The high temperature and strong irradiation conditions in the nuclear reactor will cause the risk of damage to the fuel element cladding. Therefore, during the refueling period of the reactor shutdown, the nuclear fuel assembly will be checked for damage and leakage by the sip test. The sipping test is to isolate the fuel assembly in a specified container, rely on the decay heat of the fuel itself or heat it with a heater to make the soluble fission products or fission gas escape, and then extract the sample and analyze it with a radiation detector. [0003] According to the existing reactor operating experience, the fuel assembly sipping device is mainly divided into two types: online sipp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/04G21C17/00G01T7/02
CPCG01T7/02G21C17/001G21C17/042Y02E30/30
Inventor 章静于启帆苏光辉秋穗正巫英伟田文喜
Owner XI AN JIAOTONG UNIV
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