Fusible Alloy Encasement for Spent Nuclear Fuel Storage
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Solution Overview
Problem
Current dry spent fuel storage and transport technologies are costly, operationally complex, and pose radiation exposure risks, with limitations in capacity and safety, particularly due to the need for canisters and transfer systems, which are not suitable for ultimate disposal without significant operational and capital costs.
Innovation Solution
The use of a containment vessel filled with a fusible alloy eutectic (FAE) material that encases hazardous waste materials like spent nuclear fuel, which solidifies at temperatures between 100°F and 300°F, reducing the need for canisters and transfer systems, and providing enhanced safety and security through improved heat transfer and radiation shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If canister-based concrete storage technology is used, then capital cost is reduced, but operational complexity and time increase
Solution Approach 1:
The invention merges the canister and transfer system functions into a single integrated cask design. The spent fuel is directly loaded into the cask without requiring separate canisters or transfer casks, eliminating the need for complex transfer operations while maintaining capital cost advantages of concrete storage.
Solution Approach 2:
The cask is designed to serve multiple functions: it provides storage, transport, and potential disposal capabilities in a single system. The cask can function as both a storage container and a transport package, eliminating the need for separate canister and transfer system infrastructure.
2Quantity of substance
If transfer cask systems are used, then spent fuel capacity is expanded, but radiation exposure risk increases
Solution Approach 1:
The invention extracts and eliminates the transfer cask system from the spent fuel management process. By directly loading spent fuel into final storage casks, the system removes the intermediate transfer step that exposes operators to radiation, while still achieving expanded storage capacity through efficient cask design.
3Reliability
If metal casks with bolted lids are used, then transport safety is improved, but operational time and cost increase
Solution Approach 1:
The cask is designed with pre-integrated cooling and shielding features that are built into the structure before spent fuel loading. This preliminary integration of safety features eliminates the need for time-consuming post-loading assembly operations while maintaining transport safety standards.
4Quantity of substance
If canisters and transfer systems are used, then storage capacity is increased, but disposal suitability is reduced
Solution Approach 1:
The cask is designed as a universal container that can serve both storage and disposal functions. The simplified single-loading design without separate canisters makes the cask suitable for ultimate geological disposal, while the efficient space utilization maintains high storage capacity.
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 operational costs, minimizes radiation exposure, and offers a safer, more secure method for storing and transporting hazardous waste, enabling extended reactor operation and more efficient disposal without the need for canisters and transfer systems, while maintaining regulatory compliance.
Implementation Method 1
The FAE material provides enhanced heat transfer
Implementation Method 2
The FAE material provides enhanced heat transfer and radiation shielding
Data Source
AI summary
An apparatus is provided for storing hazardous waste material, which includes one or more of spent nuclear fuel, radioactive material, and fissionable material. The apparatus comprises a containment vessel that encloses the hazardous waste material. A fusible alloy material, for example, a eutectic material, resides within the containment vessel and surrounds the hazardous waste material. In the preferred embodiments, it is suggested that the fusible alloy material exhibits liquidus and solidus or melting temperatures that are between about 100 and 300 degrees Fahrenheit for facilities using the apparatus and methods for liquid storage pool loading applications. For facilities using the apparatus and methods for dry loading, the fusible alloy materials may exhibit liquidus and solidus or melting temperatures that are between about 100 and 650 degrees Fahrenheit. The fusible alloy material is introduced in a liquid phase and eventually solidifies into a solid phase as the temperature of the hazardous waste material and/or the local environment decreases.