A visual fuel rod

Abstract

The invention provides a visual fuel rod, which is characterized in that it comprises: a lower end plug (1), a fuel cladding (2), a liquid column (3), an upper end plug (4) and a positioning winding wire (5), wherein, The liquid column (3) is arranged inside the fuel cladding (2), and the refractive index deviation between the liquid column (3) and the fuel cladding (2) is within 1%, the lower end plug (1) and the upper end plug (4) They are respectively connected to both ends of the fuel cladding (2) to seal the liquid column (3) in the fuel cladding (2), and the positioning wrapping wire (5) is wound and fixed on the outer surface of the fuel cladding (2). By providing a liquid with the same or similar refractive index inside the fuel cladding (2), it can meet the requirements of optical speed measuring equipment for refractive index matching and light transmission, and can also meet the requirements of mechanical strength. The present invention can be used to study fuel The velocity field and pressure field inside the component, etc.

Description

technical field [0001] The invention relates to the field of nuclear reactors, in particular to a visual fuel rod. Background technique [0002] Fuel assembly is a heat source with compact structure and high heat release rate per unit volume, and it is exposed to strong radiation for a long time. A typical liquid metal-cooled fast reactor fuel rod is a fuel rod bundle whose radial positioning is maintained by a spiral positioning wire or a grid-shaped positioning frame, and the axial positioning is maintained by a grid plate. The fuel rods are arranged in an equilateral triangle grid. The fuel assembly with positioning wires has a complex structure, dense flow channels, and lateral mixing, which can enhance heat transfer and reduce the probability of blockage. [0003] Liquid metal coolant is opaque, and non-contact optical velocity measurement technology cannot be used to observe the flow field inside the component. At the same time, liquid metal-cooled fast reactors oper...

AI Technical Summary

Problems solved by technology

[0004] If the selected fuel rods and working medium have poor light transmittance, it will be difficult or even impossible for the laser sheet light source to penetrate the fuel rods, which will make it difficult to obtain a clear velocity vector diagram during the experiment

If the refractive index deviation of the selected fuel rods and working fluid is large, it will cause serious refraction phenomenon after the laser light source enters the component, which will cause the distortion of the collected velocity vector image and cause a large measurement velocity error

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