Automated Fuel Pellet Loading for Nuclear Rod Manufacturing
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Solution Overview
Problem
The deviation in length of fuel pellets during the manufacturing process creates challenges in implementing an automated process for loading them into cladding tubes, requiring manual determination of the required number of pellets based on the charging length, which complicates the production of nuclear fuel rods.
Innovation Solution
An apparatus and method that includes a tray transfer unit, fuel pellet alignment unit, measurement unit, controller, and fuel pellet movement unit to automatically calculate and adjust the number of fuel pellets on a tray according to the cladding tube's length, using optical imaging and vacuum nozzles for precise alignment and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual operation is used to determine the required number of fuel pellets, then adaptability to length variations is improved, but productivity and automation extent deteriorate
Solution Approach 1:
The patent replaces the manual mechanical counting method with an optical measurement system using a camera and image processing algorithm. The system captures images of fuel pellets, automatically calculates their lengths, and determines the required number of pellets based on the cladding tube length, thereby eliminating manual intervention while maintaining adaptability to length variations.
Solution Approach 2:
The system enables self-service by allowing the measurement and calculation unit to automatically determine the required number of fuel pellets without human intervention. The apparatus measures pellet lengths, processes the data, and outputs the optimal count autonomously, making the process self-sufficient and highly productive.
2Measurement precision
If manual operation is used to determine the required number of fuel pellets, then measurement accuracy is improved through human judgment, but ease of operation and automation deteriorate
Solution Approach 1:
The patent replaces manual visual inspection and judgment with an automated optical measurement system. The camera captures high-resolution images, and the image processing algorithm precisely calculates pellet lengths and determines the required count, achieving both high measurement accuracy and operational ease through automation.
Solution Approach 2:
The patent introduces an intermediary measurement and calculation unit that acts as a bridge between the physical fuel pellets and the control system. This unit uses optical imaging and computational algorithms to accurately measure pellet dimensions and determine the optimal number, translating physical characteristics into actionable data without direct human measurement.
3Adaptability or versatility
If the number of fuel pellets is not constant due to accumulated variation, then adaptability to manufacturing variations is improved, but manufacturing precision and consistency deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the measurement and calculation unit continuously monitors the actual lengths of fuel pellets and adjusts the determined count accordingly. By using the measured lengths as feedback input, the system calculates the optimal number of pellets to achieve the target cladding tube length, compensating for accumulated variations and maintaining manufacturing precision.
Solution Approach 2:
The patent performs preliminary measurement and calculation of the required fuel pellet count before the actual loading process. By measuring pellet lengths in advance and calculating the optimal number needed to reach the target cladding tube length, the system prepares the precise configuration beforehand, ensuring manufacturing precision is maintained throughout the process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the automatic loading of fuel pellets in a unit of tray, improving the efficiency and productivity of nuclear fuel rod manufacturing by ensuring accurate calculation and adjustment of pellet numbers based on the cladding tube's length, thereby streamlining the process and reducing manual intervention.
Implementation Method 1
a measurement unit for measuring an entire length of the fuel pellets arranged in a row on the tray
Implementation Method 2
a fuel pellet movement unit for moving the fuel pellet between a tray of which length measurement is completed by the measurement unit and the waiting table
Data Source
AI summary
A method for loading fuel pellets for manufacturing a nuclear fuel rod is provided. The method includes arranging fuel pellets in a row on a tray, aligning the fuel pellets in the row on the tray such that the fuel pellets are closely in contact with one another, obtaining a total length of the pellets in the row by measuring the fuel pellets in the row on the tray, and comparing the total length with a predetermined length. When the total length is smaller than the predetermined length by a difference greater than an average unit length of the pellet, one or more fuel pellets are added in the row until to increase the total length until the difference becomes smaller than the average unit length of the fuel pellet.