Deep Borehole Isolation for Emergency Nuclear Material Containment
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Solution Overview
Problem
Current emergency procedures for containing radioactive materials during a nuclear reactor meltdown are inadequate as they do not allow for immediate in-situ disposal, requiring off-site transportation and using containment vessels that are unsuitable for emergency situations and non-reusable boreholes.
Innovation Solution
An in-situ disposal system using a deep borehole drilled near the source, which can be fully or partially cased, perforated, or intersecting permeable formations, combined with a gravity fracture, to isolate radioactive materials without the need for power and prevent steam explosions, allowing for rapid disposal of solids and liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If containment vessels are used to dispose of radioactive waste in deep boreholes, then the waste is isolated from humans and ecosystems, but the approach is unsuitable for emergency situations and the borehole cannot be reused
Solution Approach 1:
The invention removes the containment vessel from the disposal system, extracting only the essential function of isolation while eliminating the vessel's constraints. Radioactive material is disposed of directly into the borehole without intermediate containment structures, enabling both emergency response capability and borehole reusability while maintaining isolation through the borehole's depth and geological formation.
Solution Approach 2:
The borehole is prepared in advance at the nuclear facility site, positioned and constructed ready for immediate use during emergencies. This preliminary preparation eliminates the need for containment vessels during emergency disposal and allows the pre-positioned borehole to be reused for subsequent waste disposal operations.
2Quantity of substance
If off-site transportation of radioactive material is performed, then disposal capacity is available, but response time is delayed and additional containment risks are introduced
Solution Approach 1:
A borehole is drilled and prepared in advance at or near the nuclear facility site, positioned ready for immediate use during emergencies. This eliminates transportation delays and allows rapid disposal of radioactive material directly from the facility, while the borehole provides sufficient disposal capacity for emergency scenarios.
3Reliability
If deep boreholes are used for waste disposal, then isolation from the environment is achieved, but the complexity of the disposal system increases
Solution Approach 1:
The invention eliminates containment vessels and complex intermediate disposal structures, extracting only the essential deep borehole component. The simplified system uses the borehole itself as the isolation mechanism through its depth and geological formation, reducing overall system complexity while maintaining reliable environmental isolation.
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 system effectively isolates radioactive materials from the environment, preventing steam explosions and ecosystem exposure, eliminating the need for off-site transportation, and enabling reuse of the borehole for future emergencies.
Implementation Method 1
a dense slurry or fluid mixed with the radioactive material creates and propagates the gravity fracture as the radioactive material is being disposed of
Implementation Method 2
creates and propagates the gravity fracture
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
A system and method (10) to safely isolate radioactive material (M) during an emergency includes a borehole (20) located in close proximity and at a depth sufficient to safely isolate the material (M). In one embodiment, no external power source is required. In another embodiment, a fully cased borehole (20) with an insulating barrier at the bottom (25) is used to create a dry hole where hot material (M) can be safely isolated without the risk of creating a steam explosion. In an embodiment used to isolate contaminated water (W), the borehole casing (21) is perforated and the perforation (23) intersects a permeable zone where water (W) could easily flow. In yet another embodiment, a gravity fracture is located at the bottom end (25) of the borehole (20), with the radioactive material (M) entering the gravity fracture. A dense slurry or fluid could be mixed with the radioactive material (M) to create and propagate the gravity fracture as the radioactive material (M) is being disposed of.