Special gamma scanning measuring system for hot chamber and installation method thereof

Abstract

The invention relates to a special gamma scanning measuring system for a hot chamber and an installation method of the system. The special gamma scanning measuring system for the hot chamber comprises a support, a guide cylinder, a shielding transmission container, a hanging cylinder, a collimator, an attenuation shielding block, a shielding body, a gap positioning block, a gap block, a shieldingbox, a y-direction travel mechanism, steel cables, an x-direction travel mechanism, a detection trolley, a control system and the like. The special gamma scanning measuring system disclosed by the invention has advantages of simple structure, convenience in installation and dismounting, and safety and reliability. On the premise of thoroughly taking redundant functions into consideration, the special gamma scanning measuring system meets gamma scanning measuring requirements, and meanwhile, different hanging cylinders can be exchanged, and thus the measuring requirements of bar-shaped fuel assemblies, pipe-shaped fuel assemblies and the like can be met. By adopting the structural design of the square hanging cylinders and square guide cylinders, a function of respectively measuring four surfaces of each square assembly can be realized. The special gamma scanning measuring system for the hot chamber prevents staffs from being radiated by gamma rays. Different attenuation shield blocks and different gap blocks are designed to meet the measurement of different types of fuel assemblies and the measurement of different accuracy requirements. The shielding box is designed to avoid outside interference.

Description

[0001] technical field [0002] The invention relates to a scanning measurement system, in particular to a gamma scanning measurement system specially used in a hot chamber. Background technique [0003] Burnup is an important parameter of irradiated fuel assemblies. Various properties of the fuel assembly, such as the interaction between the core and the cladding, the formation of the cladding oxide film and the change of the material microstructure are all related to the burnup depth. At present, the gamma scanning method is a more suitable measurement method for measuring the relative burnup distribution of fuel assemblies. The gamma scanning technology can non-destructively measure the gamma rays emitted by the fission products generated in the irradiated fuel, so as to obtain the relative burnup distribution curve of the entire fuel assembly. At the same time, it also provides an important basis for sampling other properties of fuel assemblies, such as metallographic ...

AI Technical Summary

Problems solved by technology

[0004] Due to the large size of the square fuel assembly, it cannot move horizontally in the small space of the hot chamber shell. At the same time, the gamma spectrometer detector must be kept stable during the measurement process and cannot be moved. The existing hot cell structure cannot install the gamma spectrometer. detector

So gamma scan measurements cannot be done in a hot chamber

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