Deep Geological Caverns for Nuclear Waste Disposal
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Solution Overview
Problem
Current methods for storing and disposing of radioactive waste, such as in deep geological formations, are inefficient and unsafe due to limitations in creating large, durable human-made caverns that can prevent radionuclide migration and accommodate substantial quantities of waste.
Innovation Solution
The development of advanced oilfield drilling technologies, including under-reaming and improved drilling rig capabilities, allows for the creation of large, deep human-made caverns with controlled geometry and engineered barriers to contain radioactive waste, enabling safe and volumetrically significant storage and disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If large diameter caverns are fabricated in deep geological formations, then storage capacity and safety against radionuclide migration are improved, but manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The patent employs nested drilling operations where a small-diameter pilot wellbore is first created, then progressively enlarged through multiple reaming passes. Each reaming operation enlarges the cavity to the next size increment, ultimately forming the large-diameter cavern. This nested approach allows complex large-scale cavern fabrication by breaking it into manageable sequential steps, directly resolving the contradiction between cavern volume and manufacturing ease.
2Volume of stationary object
If human-made caverns are created in deep geological formations, then radioactive waste storage capacity increases, but the risk of cavern leakage and radionuclide migration into surrounding rocks and aquifers increases
Solution Approach 1:
The patent applies prior cushioning by creating engineered barrier systems and sealing structures before waste injection. These barriers are installed in advance to prevent potential leakage and radionuclide migration, cushioning against future failure modes. The barriers are designed to maintain containment integrity even if the cavern structure degrades over geologic time, thus resolving the contradiction between storage capacity and containment safety.
3Ease of manufacture
If solution mining is used to create salt caverns, then cavern fabrication is achievable, but cyclic pressure operations cause salt creep reducing cavern volume over time
Solution Approach 1:
The patent changes the fundamental parameter of cavern creation from solution mining (chemical dissolution) to mechanical drilling and reaming (physical removal). This parameter change eliminates the cyclic pressure operations that cause salt creep, while still achieving cavern fabrication. The drilled cavern maintains its volume stability over geologic time without the degradation issues of solution-mined caverns, resolving the contradiction between manufacture ease and duration stability.
Data Source
AI summary
Systems and methods for long-term disposal of radioactive or nuclear waste materials, in liquid, solid, and/or other physical forms, into human-made caverns, within deep geologic rock formations, derived from a wellbore, are manufactured by use of drilling and reaming technologies. The radioactive waste may be preprocessed from original surface storage site(s), transported, temporarily surface stored, and then finally further processed at a selected well site before injection into the subterranean deep human-made caverns within the host rock (deep geologic rock formations).