Dry Stripping of Radioactive Steel Drums
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Solution Overview
Problem
Current methods for stripping and preparing steel-coated barrels with radioactive contents embedded in concrete face challenges such as corrosion, volume increase during storage, and the need for water cooling in core drilling, leading to increased costs and complexity.
Innovation Solution
A device with a processing chamber and tilting and rotating unit allows for dry processing using sawing or milling tools, enabling the barrels to be processed without water cooling, allowing for both inhomogeneous and homogeneous barrels to be opened and stripped efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If core drilling with water cooling is used to strip and prepare steel-clad drums, then the drilling process can be performed, but it generates secondary waste and increases processing complexity
Solution Approach 1:
The invention extracts and removes the harmful element (water cooling system) from the core drilling process. By using dry drilling with specially designed diamond core bits that self-cool through the drilling action and concrete dust generation, the system eliminates water consumption and secondary waste generation while maintaining drilling effectiveness.
Solution Approach 2:
The invention employs disposable diamond core bits that are designed for single-use or limited-use cycles. These bits are replaced rather than maintained, eliminating the need for complex cooling and maintenance systems. The disposable nature of the bits simplifies the overall system by removing water cooling infrastructure while ensuring consistent drilling performance.
2Reliability
If over-drum concept is used to protect drums, then corrosion protection is improved, but storage volume increases by approximately 40%
Solution Approach 1:
The invention applies preliminary protective measures by treating the concrete surface and applying corrosion-resistant coatings before storage. This preliminary protection eliminates the need for additional over-drums while maintaining corrosion protection reliability. The concrete is prepared in advance with protective layers that prevent corrosion without increasing storage volume.
Solution Approach 2:
The invention changes the protective approach from adding physical volume (over-drums) to modifying surface properties (coatings and treatments). By changing the protection parameter from structural enclosure to surface chemistry, the system maintains corrosion protection while avoiding the 40% volume increase associated with over-drums.
3Use of energy by moving object
If external heating method is used to dry concrete blocks, then water removal is achieved, but drying times are very long due to low thermal conductivity
Solution Approach 1:
The invention uses mechanical vibration or electromagnetic radiation (microwaves/radio waves) to accelerate water removal from concrete. This energy input directly affects water molecules, enabling rapid evaporation and removal without relying on slow thermal conduction through the concrete mass. The process achieves thorough drying in significantly reduced time.
Solution Approach 2:
The invention utilizes phase transition of water from liquid to vapor through electromagnetic radiation heating. By directly energizing water molecules to transition phase, the system achieves rapid moisture removal bypassing the slow conductive heating process. This phase transition approach dramatically reduces drying time while ensuring complete water removal.
4Use of energy by moving object
If uniform external heating is used to dry concrete, then water removal is effective, but pressure build-up occurs leading to cracking
Solution Approach 1:
The invention uses mechanical vibration or electromagnetic radiation to remove water without generating internal pressure. The energy input directly vaporizes and removes moisture from within the concrete matrix without creating the pressure build-up that causes cracking. This method maintains concrete integrity while achieving effective water removal.
Solution Approach 2:
The invention replaces the mechanical thermal conduction heating system with electromagnetic radiation or vibration-based heating. This substitution eliminates the pressure build-up mechanism inherent in conventional heating while maintaining water removal efficiency. The non-mechanical energy input prevents structural damage to the concrete.
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
This approach reduces storage volume, minimizes secondary waste, and decreases processing costs by eliminating the need for water cooling, while ensuring safe and efficient handling of radioactive materials.
Implementation Method 1
at least two sawing or milling tools (9, 14, 15) are provided, wherein at least one sawing or milling tool (9) is for stripping, opening, or preparing the drum (6) with the tilting and rotating unit (5) in an upright position, and at least one saw or milling tool (14, 15) is for stripping, opening, or preparing the drum (6) with the tilting and rotating unit (5) in a horizontal position
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Device for stripping, opening, or preparing steel-clad drums (6) containing embedded radioactive material, comprising a processing chamber with a receiving opening for the drums (6), and a tilting and rotating unit (5) arranged in the processing chamber for receiving the drums (6), wherein a drum (6) received with its longitudinal axis parallel to a longitudinal extension of the tilting and rotating unit (5) is rotatable by the tilting and rotating unit (5) about its longitudinal axis, and the tilting and rotating unit (5) is tiltable from an upright position with a substantially vertical longitudinal extension of the tilting and rotating unit (5) to a horizontal position with a substantially horizontal longitudinal extension of the tilting and rotating unit (5), and at least two sawing or milling tools (9, 14, 15) are provided, wherein at least one sawing or milling tool (9) is for stripping,The opening or preparation of the barrel (6) is carried in its feed movement transversely to the longitudinal extent of the tilting and rotating unit (5) when the tilting and rotating unit (5) is in an upright position, and at least one saw or milling tool (14, 15) is carried in its feed movement along the longitudinal extent of the tilting and rotating unit (5) when the tilting and rotating unit (5) is in a horizontal position.