A combined tooling for pasting and scribing of fuel assembly strain gauges

Abstract

The invention discloses a scribing combined tool for pasting a strain gage of a fuel assembly. The combined tool is used for scribing on a guide tube of the fuel assembly and comprises guide rods, a scribing block, scribing screws and a positioning plate. The scribing block is provided with a guide rod through hole and a guide tube through hole which are parallel to each other, the scribing block is further provided with three scribing through holes which are communicated with the guide tube through hole, the center line of the scribing through hole in the middle intersects with the center line of the guide tube through hole, and the distance between the center lines of the two scribing through holes in the two sides is the same as the width of the strain gage. The scribing screws are arranged in the scribing through holes, the tips of the scribing screws are close to the guide tube through hole, and the positioning plate is mounted on the guide tube. The combined tool is designed special for the fuel assembly, the datum line for pasting the strain gage can be scribed at the position needing to be scribed of the guide tube of the fuel assembly conveniently, quickly and accurately through the combined tool, accurate pasting of the strain gage can be guaranteed, and a foundational guarantee is provided for the accuracy of test data.

Description

technical field [0001] The invention relates to an auxiliary device for strain testing of fuel assemblies, in particular to a combined tool for sticking and scribing lines of strain gauges of fuel assemblies. Background technique [0002] The fuel assembly is the core component of nuclear power generation. It is composed of fuel rods, guide tubes, grids, upper nozzles, lower nozzles, etc. Its fuel rods are equipped with pellets for nuclear reactions, and its performance will affect nuclear power. operating efficiency and safety. In particular, safety is the most concerned about the operation of nuclear power. If an accident occurs during operation, it may lead to catastrophic consequences. In order to ensure safety, the newly designed fuel assemblies need to go through a series of tests before being put into the reactor. [0003] Strain test is an effective test method, which can be used to test the stress state of components in many mechanical tests of fuel components. T...

AI Technical Summary

Problems solved by technology

[0004] Use a vernier caliper or a height gauge to mark the line: due to the special structure of the fuel assembly, the overall structure is slender, and there are 24 guide tubes arranged on the longitudinal section. The strain gauges are pasted on the guide tubes, and the distance between the guide tubes is small. It is distributed in multiple layers; the axial reference line of the outer guide tube can be drawn by using the height gauge, but the circumferential reference line of the guide tube cannot be drawn, and the reference line of the inner layer cannot be drawn; It is very difficult to select the marking position datum on the fuel assembly, and then calculate the datum marking position based on this datum; use the vernier caliper to draw the axial line and part of the circumferential line of the outer guide tube, because the size of the guide tube is small, the diameter It is only about 12mm, and it is very difficult to draw a line accurately; the reference line on the inner guide tube cannot be drawn with a vernier caliper

[0005] Use a steel ruler and a scribing needle to mark the line: This method can only roughly draw the reference line for the sticking position of the strain gauge on the outside of the guide tube. The scribing is inconvenient to operate, and the scribing position is not accurate. It is also difficult for the axial and circumferential reference lines to coincide with the radial plane

There is absolutely nothing you can do to determine the reference line for the inside and the attachment position of the strain gauge with special angle requirements

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