Plutonium-Uranium Metallic Fuel Fabrication via Molten Salt Electroreduction
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Solution Overview
Problem
The conventional process of converting plutonium into a usable nuclear fuel oxide form is costly and involves numerous steps, hindering the utilization of surplus plutonium as an energy source due to toxicity and proliferation concerns.
Innovation Solution
A method of fabricating metallic fuel by combining plutonium oxide powder with uranium oxide powder, electroreducing the mixture in a molten salt bath to form a dendritic alloy, pressing to remove excess salt, and then isolating and alloying with zirconium or uranium to create a second alloy with reduced proliferation potential, suitable for forming reactor components like fuel rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plutonium is converted into oxide form for nuclear fuel, then the fuel can be used in reactors, but the process involves numerous steps and is expensive
Solution Approach 1:
The patent changes the physical state parameter of plutonium from oxide form to metallic form, fundamentally altering the material properties and enabling a simplified fabrication process. This parameter change allows direct electroreduction of plutonium salts to metallic fuel, eliminating multiple conversion steps required for oxide fuel production
Solution Approach 2:
The patent extracts the essential fuel-making process from the complex oxide conversion sequence by directly producing metallic plutonium fuel through electroreduction. This extraction isolates the core function of creating usable fuel while removing unnecessary intermediate oxidation and conversion steps
2Object-affected harmful factors
If plutonium oxide powder is combined with uranium oxide powder, then proliferation potential is reduced, but the fuel fabrication process becomes more complex
Solution Approach 1:
The patent creates a composite fuel material by combining plutonium and uranium in metallic alloy form. This composite approach achieves proliferation resistance through material composition while simplifying the overall fabrication process by using direct electroreduction of mixed salts rather than complex oxide processing
3Quantity of substance
If conventional oxide fuel manufacturing is used, then fuel can be produced, but cost increases significantly
Solution Approach 1:
The patent replaces the complex mechanical and chemical processing system for oxide fuel with an electrochemical system. By using electroreduction in molten salt, the process substitutes multiple mechanical steps (mixing, pressing, sintering) with a single electrochemical transformation, significantly reducing manufacturing complexity and cost
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 method reduces the proliferation potential of plutonium, increases the safety of the fuel fabrication process, and enables the use of surplus plutonium as a more efficient and safer energy source by converting it into a metallic fuel form with enhanced properties.
Implementation Method 1
The mixed powder may be electroreduced in a bath of molten salt so as to convert the mixed powder to a first alloy
Implementation Method 2
The first alloy may be isolated from the salt by melting the pressed alloy-salt mixture
Data Source
AI summary
A method of fabricating metallic fuel from surplus plutonium may include combining plutonium oxide powder and uranium oxide powder to obtain a mixed powder with reduced proliferation potential. The mixed powder may be electroreduced in a bath of molten salt so as to convert the mixed powder to a first alloy. The first alloy may be pressed to remove a majority of the molten salt adhered to the first alloy to form a pressed alloy-salt mixture. The first alloy may be isolated from the salt by melting the pressed alloy-salt mixture. The first alloy may be further processed to fabricate a fuel rod. Accordingly, the metallic fuel produced may be used in a fast reactor system, such as a Power Reactor Innovative Small Module (PRISM).