Self-Burial Nuclear Fuel Container Using Residual Heat
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Solution Overview
Problem
Current methods for disposing of spent nuclear fuel are costly and raise safety concerns due to the need for deep geological repositories, with existing self-burial concepts being unimplemented due to doubts about safety and lack of suitable containers.
Innovation Solution
A container designed for deep underground deposition of spent nuclear fuel that utilizes residual heat from radioactive decay, supplemented by fresh fuel and a neutron source, to submerge itself up to 20 km below the Earth's surface, forming a well that can be used for geothermal energy and scientific research, with a unique structure and materials selection to ensure safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current deep geological repository methods are used for spent nuclear fuel disposal, then safety is improved, but cost increases significantly
Solution Approach 1:
The container uses its own radioactive heat generation to melt through rock and bury itself autonomously to depths of 20 km, eliminating the need for expensive external drilling equipment and operations. The spent fuel's residual heat becomes the driving force for its own disposal, making the system self-sufficient and dramatically reducing costs while maintaining safety through passive mechanisms.
2Ease of manufacture
If self-burial concept is implemented using residual heat only, then cost is reduced, but submersion speed is too slow
Solution Approach 1:
The invention combines multiple heat sources (residual radioactive decay heat from spent fuel, additional fresh nuclear fuel, and solar energy concentration) to accelerate the rock-melting process. This merging of thermal inputs increases the submersion speed from what would be achievable with residual heat alone, while still maintaining the cost advantage of passive self-burial without requiring expensive mechanical drilling systems.
3Power
If additional fresh fuel and neutron sources are added to increase heat production, then submersion capability is improved, but device complexity increases
Solution Approach 1:
The container is designed as a multi-functional system that simultaneously serves as: (1) a storage vessel for spent nuclear fuel, (2) a nuclear reactor core with fresh fuel and neutron sources for heat generation, (3) a thermal insulation structure, and (4) a self-burial device. By combining these functions into a single integrated structure, the invention increases power output without proportionally increasing complexity, as the same structural elements serve multiple purposes.
4Speed
If solar energy is used to accelerate submersion, then submersion speed is improved, but the method is limited to surface-level operations
Solution Approach 1:
Solar energy is used in the preliminary phase of the process to accelerate the initial rock-melting and container descent. Once the container reaches sufficient depth where solar heating is no longer needed, the system transitions to relying on internal radioactive heat sources for continued submersion. This preliminary use of solar energy provides a speed boost when most needed (at the surface) while the system remains adaptable to deep underground conditions where solar energy cannot reach.
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 container provides a safe, cost-effective method for long-term disposal of spent nuclear fuel, eliminating the need for intermediate storage and enabling scientific research, while generating geothermal energy and ensuring the waste remains buried indefinitely.
Implementation Method 1
The energy required for this submersion is drawn in part from the residual heat released by the radioactive decay in the spent fuel
Implementation Method 2
The heat produced can also be increased, for example, by electric heating in times of excess electricity, by burning methane or by solar energy directed into a well
Implementation Method 3
The speed of burning through the rock can be accelerated by means of concentrated sun energy, which is directed into the well by means of a system of mirrors and lenses
Implementation Method 4
the spent fuel in a special container causes the underlying rock to melt due to the release of residual heat, so that it burns through into great depths
Implementation Method 5
A well created with the container according to the invention can overcome this depth and thus provide also valuable scientific information
Data Source
Figure 1A~1D
Figure 2
AI summary
The invention relates to a container for deposition of spent radioactive fuel from nuclear power plants and a method for deposition spent radioactive fuel. The container according to the invention ensures the safe deposition of radioactive waste by submersion into a great depth (up to 20 km) below the Earth's surface. The energy required for this submersion is drawn in part from the residual heat released by the radioactive decay in the spent fuel and in part from the fresh fuel for nuclear power plants, which is added to the waste. When the container is submerged, a very deep well is created at the same time, which can then be used to obtain geothermal energy and to research the Earth's interior. The container according to the invention comprises as main parts a container body (1), a lid (2) and a casing part (3), wherein the body (1) and the lid (2) form a lower cylindrical part and the casing part (3) forms an upper cylindrical part, the body (1) being a cylindrical vessel with a cavity for storing nuclear fuel, the bottom (4) of which is shaped to penetrate into the rock.