Metallography detection method of MOX pellets

Abstract

The invention belongs to the technical field of product analysis and inspection, and particularly relates to a metallography detection method of MOX pellets. MOX fuel pellets with intact surfaces andno cracks are selected, and sodium sulfide is added into epoxy resin to configure an inlay sample agent; the MOX fuel pellets are placed in the central position of phenolic resin inlay sample sleeves,the inlay sample agent is poured in, and after standing and solidification of the inlay sample agent, inlaid samples are taken from the inlay sample sleeves; the inlaid samples are arranged in clamping plates of a grinding and polishing device and fixed, grinding is conducted on grinding and polishing plates from coarse to fine separately, and sample water is washed each time when the grinding and polishing plates are replaced; the washed samples continue to be arranged in the grinding plates and fixed, and the samples are polished on a lint, meanwhile the Al2O3 grinding and polishing liquidis poured on the grinding and polishing plates, and the samples are washed with water after the grinding and polishing; corrosion soaking is conducted on the ground and polished samples using a corrosion liquid prepared from HNO3 and HCl, and then the surfaces of the samples are washed with water after the corrosion soaking, and rinsing and dry blowing are conducted using anhydrous ethanol. According to the metallography detection method of the MOX pellets, accurate measurements of the grain sizes of the pellets and equivalent diameters of pores can be achieved.

Description

technical field [0001] The invention belongs to the technical field of product analysis and detection in the nuclear fuel production process, and in particular relates to a metallographic detection method of MOX pellets. Background technique [0002] Grain size and pore equivalent diameter are the key technical parameters of MOX fuel pellets, which have guiding significance for the setting of fast pressing and sintering process parameters of fuel cores, and the microstructure of pellets directly affects the pellets in the reactor. Effect. At present, the traditional fuel pellet metallographic measurement technology mainly has four shortcomings. First, the MOX fuel pellet structure is small and contains a central hole structure. The traditional PWR pellet grinding and polishing process will cause MOX pellets to crack and break The second is that MOX fuel pellets contain uranium and plutonium elements, so the corrosive agent of traditional pellets is not suitable for MOX pell...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a metallographic detection method of MOX pellets, which solves the problems of low grinding and polishing efficiency and unobvious corrosion effect, and realizes accurate measurement of pellet grain size and pore equivalent diameter