Composite Radioactive Waste Cask for Impact and Radiation Shielding
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Solution Overview
Problem
Existing radioactive waste containers lack sufficient resistance to mechanical stresses such as impacts during transport and potential attacks, compromising the safety of long-lived radioactive waste storage and transport.
Innovation Solution
A radiation and impact-protected radioactive waste cask design featuring a stainless-steel outer and inner walls with a mild steel layer, a continuous lead lining, quartz sand, and a removable outer transportation canister with multiple layers of armor grade steel and ceramic materials to enhance resistance to mechanical shocks and impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a simple container structure is used for radioactive waste storage, then manufacturing cost and complexity are reduced, but resistance to mechanical stress and impact is insufficient
Solution Approach 1:
The container employs a composite structure consisting of an inner vessel made of corrosion-resistant material (e.g., stainless steel or titanium), an intermediate layer of radiation-shielding material (e.g., lead or depleted uranium), and an outer protective shell. This multi-material composite design provides simultaneous protection against corrosion, radiation, and mechanical stress, resolving the contradiction between strength and structural complexity.
Solution Approach 2:
The container is divided into distinct functional segments: an inner vessel for waste containment, an intermediate radiation-shielding layer, and an outer protective structure. Each segment performs a specific function, allowing the overall system to achieve high mechanical strength and radiation protection without excessive complexity in any single component.
2Object-affected harmful factors
If thick radiation shielding material is added to protect against radiation, then radiation protection is improved, but resistance to impact and mechanical damage decreases
Solution Approach 1:
The container uses a composite structure where the inner vessel is made of tough, impact-resistant material (such as stainless steel or titanium alloy) that provides mechanical strength, while a separate intermediate layer contains the radiation-shielding material (lead or depleted uranium). This separation allows each material to perform its optimal function without compromising the other, resolving the contradiction between radiation protection and impact resistance.
3Reliability
If a multi-layer composite structure is used to enhance protection, then resistance to mechanical damage and radiation is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The container is manufactured as separate modular segments (inner vessel, intermediate shielding layer, outer shell) that can be produced independently using standard industrial processes. These segments are then assembled together, which simplifies manufacturing compared to creating a monolithic multi-layer structure, while still achieving the required reliability and protection levels.
4Strength
If the container wall thickness is increased to improve mechanical strength, then resistance to impact is improved, but weight and manufacturing cost increase
Solution Approach 1:
The container employs high-strength, low-density materials such as titanium alloys or advanced stainless steel grades for the inner vessel and outer shell. These materials provide exceptional mechanical strength and impact resistance with significantly lower weight compared to traditional thick carbon steel constructions, resolving the contradiction between mechanical strength and weight.
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 design significantly increases the container's resistance to mechanical damage, maintaining integrity during transport and storage, including extreme temperatures and potential attacks, ensuring safe handling and storage of radioactive waste.
Implementation Method 1
a continuous lead lining covering the stainless-steel inner wall and the stainless-steel bottom
Implementation Method 2
a volume of quartz sand at least partially filling up a space of the radiation-protected cylindrical or polygonal cavity left after insertion of the one or more inner radioactive waste vessels
Data Source
Figure 1
Figure 2
AI summary
A radiation and impact-protected radioactive waste cask, comprising a radioactive waste storage container (10, 100) defining an inner space with a radiation-protected cylindrical or polygonal cavity, comprising: a stainless-steel outer wall (12, 112), a stainless-steel inner wall (14, 114), a layer of mild steel (16, 116) between the inner and outer walls, a stainless-steel bottom (18, 118), a lead lining (53, 153) covering the inner wall and bottom, separated from said cavity by a beaker-shaped stainless-steel enclosure (56, 156), a stainless- steel top (54, 154), comprising a lead layer (541, 154'), for closing said cavity, one or more inner radioactive waste vessels (24i, 242, 124) for radioactive waste (26, 126), quartz sand (22, 122) at least partially filling up a space of the cavity left after insertion of the inner radioactive waste vessels, and a stainless-steel lid (20, 120) closing the container.