Experimental device for nuclide migration study under high temperature condition

Abstract

The invention relates to an experimental device for nuclide migration study under high temperature condition. The device is characterized in that: it comprises a PTFE diffusion liner and a metal outer frame. The diffusion liner is arranged at the opening of the metal outer frame, and is propped tightly by the top plate of the metal outer frame so as to be fixed in the outer frame. O-shaped gaskets are added to both sides of a central diffusion rock piece respectively, then the central diffusion rock piece is placed in the middle of two diffusion cell bodies, and by pressing the two diffusion cell bodies tightly, two diffusion cells are formed on two sides of the rock piece. The compressed O-shaped gaskets can play the role of buffering pressure and stressing the rock piece evenly, and also has a sealing effect. The diffusion liner and interfaces involved in the invention all adopt the PTFE material, thus having good aging resistance and high temperature resistance. Through application, the experimental device provided by the invention is expected to provide a reliable experimental platform for assessing the migration behavior of radionuclide at high temperature, and has good application prospects.

Description

technical field [0001] The invention relates to the field of nuclide migration research, in particular to an experimental device for nuclide migration research under high temperature conditions. Background technique [0002] The main types of nuclide migration research are divided into laboratory research and field research. The laboratory research mainly uses the diffusion cell to simulate the migration behavior of nuclides under the geological disposal conditions of high-level radioactive waste, so as to obtain a series of data such as apparent diffusion coefficient and effective diffusion coefficient. It can be seen that the diffusion cell is the basis of laboratory research, and its performance indicators and design functions will directly affect whether the diffusion experiment can be close to the conditions of geological disposal of high-level radioactive waste, so as to obtain more realistic data. [0003] Diffusion cells used in common diffusion experiments are main...

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Problems solved by technology

For some fragile materials, such as granite, etc., when the flange is tightened, a little carelessness will produce uneven force and cause the rock slice to break

The characteristics of high-temperature diffusion experiment are long-term (experiment period about 3-5 months), high temperature (about 80-100°C), and complex experimental conditions (large pH range and complex solution composition), so the above two conventional experimental devices Can not meet the experimental requirements very well

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