Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for measuring underwater bending and twisting position of irradiated fuel assembly

A technology of fuel assembly and measurement method, which is applied in the fields of nuclear reactor monitoring, reactor, nuclear power generation, etc., can solve the problems of discontinuous measurement process, low measurement efficiency, large measurement error, etc. The effect of positive error

Active Publication Date: 2018-04-27
NUCLEAR POWER INSTITUTE OF CHINA
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the measurement process is not continuous when measuring the bending and twisting position of the underwater fuel assembly, and multiple measurements are required, resulting in low measurement efficiency and large measurement errors, which affect the underwater bending and twisting of the fuel assembly. The purpose of this method is to provide a method for measuring the bending and torsion of fuel assemblies underwater after irradiation. This method is easy to operate and can quickly and non-contact the bending and twisting of fuel assemblies within the first time after irradiation. Measurement; the use of ruler calibration reduces the visual error of the video image and improves the measurement accuracy; it can realize the longitudinal continuous measurement of the fuel assembly and improve the measurement efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for measuring underwater bending and twisting position of irradiated fuel assembly
  • A method for measuring underwater bending and twisting position of irradiated fuel assembly
  • A method for measuring underwater bending and twisting position of irradiated fuel assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as Figure 1 to Figure 6 As shown, a method for measuring the underwater bending and twisting position of the fuel assembly after irradiation, setting the positioning grid in the fuel assembly to be 10 layers, and first measuring the bending degree:

[0037] (1) To measure the bending degree, the longitudinal height value of the positioning grid 3 in the fuel assembly 2 should be measured first, and a 10m ruler should be erected in the longitudinal direction of the fuel assembly, and the height value of the positioning grid should be read according to the video. The actual distance between two adjacent longitudinal slits 4 on the positioning grid 3 is a standard distance of 12.32mm;

[0038] (2) Fix a collimated plumb line 1 at a distance of 10mm from the edge line of the fuel assembly positioning grid, then adjust the position of the camera so that the edge of the grid and the plumb line are located in the center of the display screen, and move the camera from top...

Embodiment 2

[0049] Such as Figure 1 to Figure 6 As shown, the positioning grid in the fuel assembly is set to be 12 layers, and the curvature measurement is performed first:

[0050] (1) To measure the bending degree, the longitudinal height value of the positioning grid 3 in the fuel assembly 2 should be measured first, and a 10m ruler should be erected in the longitudinal direction of the fuel assembly, and the height value of the positioning grid should be read according to the video. The actual distance between two adjacent longitudinal slits 4 on the positioning grid 3 is a standard distance of 14.58mm;

[0051] (2) Fix a collimated plumb line 1 at a distance of 20mm from the edge line of the fuel assembly positioning grid, then adjust the camera position so that the edge of the grid and the plumb line are located in the center of the display screen, and move the camera from top to bottom to record collection;

[0052] (3) Read the pixel value of 165 from the edge contour line of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for measuring the underwater bending and torsion shape of a fuel assembly after irradiation. The standard distance on the positioning grid is taken; the collimation plumb line is fixed on the edge line of the positioning grid of the fuel assembly, and the camera is moved to collect video; Read the pixel value on the video and the pixel value between two adjacent vertical slits on the positioning grid, and get the curvature by fitting; read the scale value of the scale and the corresponding pixel value on the display screen, and fit the pixel value and Angle value relationship curve; read the pixel value of the distance from the edge of the positioning grid to the coincident plumb line when the two plumb lines coincide in the video; continue to move the camera to end the video recording; get the twist of the lower tube base relative to the upper tube base . The method is easy to operate, and can realize rapid and non-contact measurement of the curvature and twist of the fuel assembly within the first time after irradiation; the use of ruler calibration reduces the apparent error of the video image and improves the measurement accuracy; it can realize The longitudinal continuous measurement of the fuel assembly improves the measurement efficiency.

Description

technical field [0001] The invention belongs to the field of poolside inspection of irradiated fuel assemblies in the nuclear fuel cycle, and in particular relates to a method for measuring underwater bending and torsion shape of irradiated fuel assemblies. Background technique [0002] Fuel assemblies in nuclear power plants are subject to increasingly harsh operating conditions such as high fuel consumption, chemical changes in long-term circulating water, and high power peak factors when low leakage occurs. Fuel assemblies are easily deformed and cannot be returned to the stack for reuse. Fuel rods swell after irradiation. Even broken. As an effective means of evaluating the radiation stability and integrity of fuel assemblies, poolside inspection technology undertakes an important task to ensure the safe operation of nuclear power plants. [0003] As an important part of the poolside inspection technology, the underwater bending and twisting measurement technology of fu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G21C17/10
CPCG21C17/10Y02E30/30
Inventor 陈哲江林志任亮尹春燕邝刘伟熊源源余飞杨陈军
Owner NUCLEAR POWER INSTITUTE OF CHINA