Nuclear Waste Capsule Shielding for Deep Geological Storage
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Solution Overview
Problem
Current methods for disposing of nuclear waste are costly, hazardous, and inefficient, with existing technologies requiring expensive intermediate steps and inadequate radiation shielding, leading to challenges in safely transporting and storing high-level nuclear waste.
Innovation Solution
The development of nuclear waste capsules with integrated neutron and gamma radiation shielding, using borated stainless steel and tar-like deposits as protective mediums, allowing for safe transport and long-term storage in deep geological formations, minimizing intermediate steps and overall costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional surface storage methods are used for high-level nuclear waste, then the waste can be stored with basic infrastructure, but the operational costs become extremely high (hundreds of millions of dollars annually) and the safety risks increase due to continuous cooling requirements and surface accessibility
Solution Approach 1:
The nuclear waste is segmented into individual capsules, each independently sealed and shielded. This segmentation allows each capsule to be a self-contained safety unit that can be stored independently, eliminating the need for continuous active cooling infrastructure and reducing operational costs while maintaining safety.
Solution Approach 2:
A geologic formation acts as an intermediary barrier between the nuclear waste capsules and the surface environment. This natural intermediary provides passive cooling and isolation, eliminating the need for expensive active cooling systems and reducing operational energy requirements while enhancing safety through multiple barrier layers.
2Object-affected harmful factors
If nuclear waste is transported with adequate radiation shielding, then personnel safety is protected, but the capsule weight and complexity increase significantly
Solution Approach 1:
Radiation shielding is applied locally and selectively to the capsule components that require protection during transport, rather than uniformly throughout the entire capsule structure. This localized approach provides adequate radiation protection for personnel while minimizing unnecessary weight addition to the capsule system.
Solution Approach 2:
The shielding design provides partial protection adequate for transport distances and conditions, rather than excessive protection designed for indefinite storage. This partial action approach achieves the necessary safety level for transport while avoiding the weight penalty of over-engineered shielding.
3Reliability
If intermediate processing steps are performed on nuclear waste before storage, then the waste can be better prepared for long-term storage, but the cost and time requirements increase significantly
Solution Approach 1:
The waste is processed and encapsulated into sealed capsules with integrated shielding before storage, performing the necessary preparation actions in advance. This preliminary action ensures the waste is ready for long-term storage without requiring further intermediate processing steps, reducing both time and cost while maintaining reliability.
Solution Approach 2:
The capsule design is self-sufficient, providing its own shielding and containment without requiring external processing or maintenance infrastructure. This self-service capability eliminates the need for complex intermediate processing steps and reduces the time required to prepare waste for storage.
4Object-affected harmful factors
If extensive radiation shielding is implemented for nuclear waste storage, then radiation protection is improved, but the device complexity and material requirements increase
Solution Approach 1:
The capsule employs composite material construction, combining different materials with complementary properties to achieve effective radiation shielding. This composite approach provides the necessary protection while maintaining a relatively simple capsule structure, avoiding the complexity of multiple separate shielding components.
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 approach provides effective radiation protection during transport and storage, ensuring personnel safety and environmental security while reducing operational and economic burdens by minimizing the need for extensive shielding and intermediate processing steps.
Implementation Method 1
the neutron absorbing medium/layer can be designed and implemented to provide the required level of radiation protection, neutron slowdown, and neutron shielding necessary
Implementation Method 2
there is a strong need for improved radiation shielding materials and techniques for waste container capsules so that the HLW can be safely transported and disposed of effectively
Data Source
AI summary
Embodiments of the present invention center around systems and methods for long-term disposal of high-level nuclear waste that is to be placed inside of particular waste-capsules that are in turn to be placed into wellbores that are located in deep-geologic-formations. Mostly or fully intact spent nuclear fuel rod assemblies may be internally packed in the waste-capsules. A given waste-capsule may include a protective-medium around the contained nuclear waste, a corrosion protective layer around the protective-medium, and a neutron absorbing and/or slowdown layer around the corrosion protective layer. The protective-medium may be in the form of a mold or injected into the waste-capsule. The protective-medium may shield against gamma radiation and protect the waste-capsule from degradation. Further, a transporter is described for surface transportion of loaded nuclear waste-capsules so that the loaded nuclear waste-capsules may be safely transported to a drilling-rig site for insertion into the wellbore.