Solid Lithium-Lead Blanket for Fusion Reactors
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Solution Overview
Problem
Current solid breeder blankets for fusion reactors are economically unviable due to the high cost and limited availability of beryllium as a neutron multiplier, and alternative materials like lanthanide elements increase costs and reduce tritium production.
Innovation Solution
A solid lithium-lead blanket using a lithium-lead alloy as both neutron multiplier and tritium breeder, optimized for high melting point and stability, with an optimal lithium/lead atomic ratio determined through neutron physics and thermal hydraulics coupling, ensuring the alloy remains solid under fusion neutron deposition and cooling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beryllium is used as a neutron multiplier in solid breeder blankets, then neutron multiplication performance is improved, but material cost and construction cost increase significantly
Solution Approach 1:
The invention changes the material composition parameter from beryllium to lithium-lead alloy, specifically optimizing the lithium to lead atomic ratio (such as 1:3, 1:4, or 1:5) to achieve both cost reduction and maintained neutron multiplication performance. This parameter change allows the blanket to use abundant, low-cost materials while preserving essential neutronic functions.
Solution Approach 2:
The invention replaces expensive beryllium with cheaper lithium-lead alloy materials that are more abundant and economically viable for large-scale fusion reactor construction. The lithium-lead alloy provides a cost-effective alternative that maintains functional performance while dramatically reducing material costs.
2Ease of manufacture
If elementary lead is used as a neutron multiplier, then material cost is reduced, but melting point decreases causing liquid lead to penetrate coolant channels and block flow
Solution Approach 1:
The invention creates a composite lithium-lead alloy material that combines the low-cost advantage of lead with the high melting point contribution from lithium. The eutectic composition of this composite alloy ensures the melting point remains above operating temperatures (650-700°C), preventing liquid penetration while maintaining economic viability.
Solution Approach 2:
The invention changes the compositional parameters of lead by adding lithium in specific ratios, which fundamentally alters the phase diagram and melting characteristics. This parameter change transforms elementary lead from a low-melting-point material into a high-temperature stable lithium-lead alloy suitable for fusion reactor conditions.
3Reliability
If lanthanide elements are combined with lead to increase melting point, then thermal safety is improved, but material cost increases and tritium production performance decreases
Solution Approach 1:
The invention replaces expensive lanthanide elements with lithium, which is significantly more abundant and cost-effective. Lithium provides the necessary melting point elevation when combined with lead in eutectic ratios, achieving the same thermal safety goal without the high material costs associated with rare-earth elements.
Solution Approach 2:
The invention changes the alloying element parameter from lanthanide to lithium, fundamentally altering the material composition to achieve optimal balance between melting point, cost, and tritium production. The lithium-lead eutectic system provides superior performance compared to lanthanide-lead combinations across multiple parameters.
4Ease of manufacture
If lithium-lead alloy is used as both neutron multiplier and tritium breeder, then material cost is reduced and design is simplified, but the alloy must maintain solid state under high neutron deposition conditions
Solution Approach 1:
The invention optimizes the compositional parameters of the lithium-lead alloy, specifically the atomic ratio of lithium to lead (such as 1:3, 1:4, or 1:5), to ensure the eutectic melting point exceeds the maximum operating temperature under neutron irradiation. This parameter optimization guarantees phase stability while enabling dual-function operation as neutron multiplier and tritium breeder.
Solution Approach 2:
The invention makes the lithium-lead alloy serve multiple functions simultaneously: as neutron multiplier, as tritium breeder, and as a structurally stable material maintaining solid phase under irradiation. This multi-functionality simplifies the overall blanket design and reduces material costs compared to multi-material systems.
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 lithium-lead alloy reduces material costs and improves economic viability by eliminating the need for beryllium, maintaining tritium production efficiency, and simplifying the design and manufacturing process while enhancing thermal safety and thermoelectric conversion efficiency.
Implementation Method 1
a solid lithium-lead alloy... serves as a neutron multiplier and a tritium breeder
Implementation Method 2
breeding tritium to maintain a fusion reaction
Implementation Method 3
nuclear thermal deposition in the solid lithium-lead alloy generated due to an interaction between the solid lithium-lead alloy and a fusion neutron
Implementation Method 4
is moved out by the coolant flowing inside the structural skeleton for power generation
Data Source
AI summary
Disclosed is a solid lithium-lead blanket for a fusion reactor, where a solid lithium-lead alloy is adopted as a neutron multiplier and a tritium breeder, and is placed in a form of a unitary or binary pebble bed inside a structural skeleton composed of structural materials; and nuclear thermal deposition in the solid lithium-lead alloy generated due to an interaction between the solid lithium-lead alloy and a fusion neutron is moved out by a coolant. A proportion of lead atoms in the solid lithium-lead alloy is low, so that, under normal operations and accident conditions of the blanket, the solid lithium-lead alloy always remains in a solid state without melting, and tritium can be brought out of the reactor by purge gas flowing through the pebble bed to allow tritium self-sufficiency. The blanket of the present disclosure does not require beryllium to meet the requirements of tritium breeding.