Shielded Plasma Cutting for Nuclear Waste Volume Reduction
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Solution Overview
Problem
The removal of highly irradiated materials from hazardous environments, such as nuclear reactors, poses challenges due to radiation exposure risks for workers and the high cost of shielded waste containers, with existing methods like manual cutting and hydraulic systems being inefficient and hazardous.
Innovation Solution
A volume reduction apparatus with a shielded housing and contactless cutting units, including laser or plasma cutters, that rotates and axially moves cutting heads to cut irradiated materials within a sealed environment, reducing the need for high-tonnage forces and hydraulic systems, and allowing for non-contact cutting and efficient waste reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual cutting methods are used to reduce volume of irradiated materials, then workers can directly control the cutting process, but workers are exposed to significant radiation doses which limits their ability to work safely and the amount of time they can spend on site
Solution Approach 1:
The patent replaces manual mechanical cutting operations with an automated robotic system that uses plasma arc cutting. The robotic manipulator positions and operates the plasma torch without human operators being present in the contaminated zone, eliminating direct radiation exposure while maintaining precise control over the cutting process through automated positioning systems
Solution Approach 2:
The patent introduces a remote-operated robotic system as an intermediary between the operator and the irradiated materials. The operator controls the cutting process from a safe location away from radiation, while the robotic manipulator performs the actual cutting operations inside the shielded container, acting as a mediator that transfers control without exposing humans to harmful radiation
2Volume of stationary object
If hydraulic systems with high strength presses are used to volume reduce irradiated components by crushing, then volume reduction can be achieved, but the system is slow, has mechanical wear leading to limited life, and depends on high tonnage forces and a sizable hydraulic system
Solution Approach 1:
The patent replaces the mechanical hydraulic pressing system with a thermal cutting-based volume reduction system. Instead of using high-tonnage mechanical forces to crush materials, the system uses plasma arc cutting to sever and fragment materials into smaller pieces, achieving volume reduction without the speed limitations and mechanical wear issues of hydraulic systems
Solution Approach 2:
The patent changes the fundamental parameter of volume reduction from mechanical compression (hydraulic pressing) to thermal separation (plasma cutting). This parameter change allows for faster processing speeds since cutting operations can be performed more quickly than mechanical compression, while also eliminating the mechanical wear and high-tonnage force requirements of hydraulic systems
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
The apparatus enables safe, high-speed, and reliable volume reduction of irradiated materials, reducing the need for shielded waste containers and minimizing radiation exposure, while offering a compact and cost-effective solution for decommissioning and refurbishment processes.
Implementation Method 1
at least one cutting head includes a laser cutter
Implementation Method 2
at least one cutting head includes a plasma torch
Data Source
AI summary
An apparatus for volume reduction of material removed from a hazardous environment. The apparatus includes a shielded housing for receiving a workpiece therein, at least one cutting unit having a cutting head operable for contactless cutting, and a drive unit for rotating the at least one cutting unit around a main axis so the cutting head cuts the workpiece.