Reactor Vessel Cutter Carriage With Wall Stabilization
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Solution Overview
Problem
Existing methods for cutting reactor vessels, particularly in decommissioned nuclear reactors, face challenges in efficiently and safely segmenting components due to high residual radioactivity and the need for precise cutting operations.
Innovation Solution
A reactor vessel cutting device equipped with a hoist system, cutter carriage, and stabilization systems, including magnetic or wedge stabilization, allows for precise mechanical cutting by suspending the cutter carriage and applying it to the vessel wall, enabling longitudinal and angular cuts with minimal footprint and efficient cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrical discharge cutting is used to remove specimens from reactor walls, then cutting can be performed in high radiation environments, but the cutting precision and control are difficult to maintain
Solution Approach 1:
The patent replaces electrical discharge cutting with a mechanical cutting system consisting of a cutter carriage, cutter head, and hoist system. This mechanical approach provides better control and precision while allowing operation in high radiation environments, as the system can be remotely operated and maintained under protective water.
Solution Approach 2:
The patent introduces water as an intermediary medium, maintaining the cutting system under protective water. This water barrier shields operators from radiation while allowing the mechanical cutting system to operate precisely on reactor components, solving both the radiation exposure problem and maintaining cutting accuracy.
2Ease of operation
If a rotating platform with cutting tools is inserted into the reactor vessel, then cutting operations can be performed inside the vessel, but the device complexity and reconfiguration requirements increase
Solution Approach 1:
The cutting system is segmented into modular components: a hoist system for positioning, a cutter carriage that can be independently controlled, and a cutter head with interchangeable tools. This segmentation allows the system to access different locations within the reactor vessel without requiring complete reconfiguration, reducing overall device complexity while maintaining accessibility.
Solution Approach 2:
The cutter carriage is designed with dynamic positioning capabilities through the hoist system, allowing it to be moved to different locations and orientations as needed. This dynamic adaptability eliminates the need for complex fixed rotating platforms, simplifying the overall device structure while maintaining full accessibility to the vessel interior.
3Manufacturing precision
If mechanical cutting is used for reactor vessel segmentation, then cutting precision is improved, but the weight and complexity of the cutting device increase
Solution Approach 1:
The hoist system serves as a counterweight and support mechanism, bearing the weight of the cutter carriage and allowing precise positioning without requiring the carriage itself to be heavily constructed. This separation of support function from cutting function reduces the moving weight of the cutter carriage while maintaining mechanical cutting precision.
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 safe and efficient cutting of reactor vessels by maintaining stability and control during mechanical cutting, facilitating the segmentation of reactor components without extensive reconfiguration, thus enhancing safety and operational efficiency.
Implementation Method 1
the cutter carriage includes a magnetic stabilization system secured to the carriage body and operable to hold the cutter carriage to a vessel wall of the reactor vessel
Data Source
AI summary
A reactor vessel cutting device, including a hoist system; a mechanical cutter; and a cutter carriage secured to the hoist system to be suspended by the hoist system. The cutter is secured to a carriage body of the cutter carriage to be carried by the carriage body. The cutter carriage includes a stabilization system secured to the carriage body and operable to hold the cutter carriage against a vessel wall of the reactor vessel. The cutter carriage is operable to apply the cutter to the vessel wall in a mechanical cutting operation when the cutter carriage is held against the vessel wall by the stabilization system. The hoist system is configured to bear the weight of the cutter and the cutter carriage during the mechanical cutting operation and the stabilization system is configured to carry cutting forces generated during the mechanical cutting operation.