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Visual fuel rod processing method of lead-cooled fast reactor

A processing method and fuel rod technology, applied in the field of nuclear reactors, can solve problems such as surface roughness not up to optical experiments, 3D printing processing is difficult to process, and multiple diffuse reflections of lasers, etc., to achieve small out-of-roundness, small impact, The effect of less bubble accumulation

Pending Publication Date: 2021-11-12
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using 3D printing technology to process fuel rod bundles with plexiglass tapes and wires, the surface roughness does not meet the requirements of optical experiments, and it is easy to cause multiple diffuse reflections of the laser and adhesion of tracer particles in the gaps; at the same time, 3D printing processing is difficult. Processing to obtain a longer experimental section
However, the cost of open mold casting is very high, and the mold needs to be reprocessed when changing the size of the fuel rod or winding wire

Method used

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  • Visual fuel rod processing method of lead-cooled fast reactor
  • Visual fuel rod processing method of lead-cooled fast reactor
  • Visual fuel rod processing method of lead-cooled fast reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Such as figure 1 Shown is a schematic structural view of the visualized fuel rods of the lead-cooled fast reactor in the present invention. The visualized fuel rod of the lead-cooled fast reactor of the present invention includes a plexiglass fuel rod 300 and a plexiglass winding wire 200 ; the winding wire 200 is wound on the outer surface of the plexiglass fuel rod 300 with equal pitch.

[0101] The upper end of the plexiglass fuel rod 300 is provided with an upper end plug 400, and the upper end plug 400 is provided with a rectangular square groove; To enhance the mechanical strength in the subsequent assembly process, it can also be changed to other metal materials.), such as Figure 2-3 As shown, the lower end plug 500 is provided with a circular boss and a rectangular square groove, as well as a positioning hole 700 of the lower end plug.

[0102] A visual fuel rod processing method for a lead-cooled fast reactor, comprising the following steps:

[0103] 1) Sel...

Embodiment 2

[0171] The pressure distribution and velocity distribution measurements were performed on the visualized fuel rods of the lead-cooled fast reactor prepared in Example 1 above.

[0172] The steps to measure the pressure distribution are:

[0173] 1) Inject the working medium; 2) Exhaust the circuit; 3) Open the filter to filter and remove impurities; 4) Adjust the temperature of the flowing working medium; 5) Adjust the frequency conversion device of the water pump to switch between different test conditions; 6) Use measurement and control The program monitors and collects data from measuring equipment such as thermocouples, flowmeters and pressure sensors; 7) Experimental data processing and analysis.

[0174] The steps to measure the velocity distribution are:

[0175] 1) Inject the working medium; 2) Exhaust the circuit; 3) Open the filter to filter and remove impurities; 4) Adjust the focal length of the laser beam according to the position of the laser beam and the fuel a...

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Abstract

The invention discloses a visual fuel rod processing method of a lead-cooled fast reactor. The method comprises the following steps: selecting an organic glass fuel rod and a winding wire; assembling a lower end plug at the lower end of the organic glass fuel rod and assembling an upper end plug at the upper end; assembling the connecting pipe and the upper end plug of the organic glass fuel rod, and binding and fixing by using an adhesive tape; connecting one end of the winding wire into the positioning hole of the lower end plug, winding the winding wire on the organic glass fuel rod in an equal-pitch mode, then fixing the tail end of the winding wire to the surface of the organic glass fuel rod, in the wire winding process, performing ultraviolet baking on the winding wire for synchronous curing, and finally detaching the connecting pipe; and baking the organic glass fuel rod, and coating the UV glue once to obtain the visual fuel rod of the lead-cooled fast reactor. The fuel rod with the winding wire, which is high in light transmission, accurate in screw pitch, firm in bonding and long in service life, can be obtained, and the center distance of adjacent fuel rods after assembly better conforms to a design value.

Description

technical field [0001] The invention relates to a visual fuel rod processing method for a lead-cooled fast reactor, which belongs to the technical field of nuclear reactors. Background technique [0002] Lead-cooled Fast Reactor (LFR) refers to a fast neutron reactor that adopts a closed fuel cycle, uses liquid lead-bismuth alloy (Lead-Bismuth Eutectic, LBE) as the coolant, and operates under high temperature and low pressure conditions. . The flow characteristics of the coolant in the fuel assembly have a very important influence on the safety and economy of the reactor system. As a common positioning part of LFR, wire wrapping has the following three functions: (1) to determine the distance between adjacent fuel rods; (2) to reduce the vibration and bending of the rod bundle; (3) to enhance the convective heat transfer of the rod bundle flow channel. Therefore, it is very important to carry out the research on the flow characteristics in the channel of the wrapped wire f...

Claims

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Application Information

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IPC IPC(8): G21C21/00
CPCG21C21/00Y02E30/30
Inventor 范大军顾龙彭天骥李荣杰何明翰唐延泽李金阳王大伟范德亮田旺盛李显文李秀凌
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI