Gamma Ray Inspection of Nuclear Waste Canister Welds
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Solution Overview
Problem
The safe storage of nuclear waste, particularly spent nuclear fuel, poses challenges due to the need for reliable containment and inspection methods to ensure the integrity of welds in canisters, which is crucial for preventing leakage and ensuring long-term storage solutions.
Innovation Solution
A method and system utilizing a gamma ray image detector to inspect the welds of nuclear waste canisters by receiving gamma rays that travel through voids, generating an image, and determining the integrity of the welds, which can include rotating the canister or detector for comprehensive inspection, and using corrosion-resistant alloys like CRA 625 for the canister components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional storage methods (tunnels, boreholes) are used for nuclear waste, then storage capacity and accessibility are improved, but containment reliability and inspection capability deteriorate
Solution Approach 1:
The patent replaces mechanical inspection methods with gamma radiography technology. Gamma rays penetrate the weld structures and detect voids or defects through radiation transmission, providing non-contact, high-reliability inspection of containment welds without requiring physical access or mechanical disruption of the storage system.
Solution Approach 2:
The patent introduces gamma rays as an intermediary detection medium. The gamma ray image detector uses radiation transmission through the weld to indirectly identify defects, allowing inspection of containment integrity without direct physical contact with the hazardous material or structural components.
2Reliability
If weld inspection is performed on nuclear waste canisters, then containment reliability is improved, but inspection complexity and detection difficulty increase
Solution Approach 1:
The patent replaces complex mechanical inspection systems with gamma radiography. The gamma ray image detector automatically captures images of weld structures through radiation transmission, eliminating the need for complex mechanical disassembly, physical access, or traditional non-destructive testing methods.
Solution Approach 2:
The patent enables the weld structure itself to serve as the detection target. The gamma rays interact with the weld material and voids within the weld to create detectable images, allowing the structure to essentially inspect itself through radiation transmission without requiring external mechanical intervention.
3Measurement precision
If gamma ray image detection is used to inspect welds, then inspection reliability and void detection capability are improved, but device complexity and energy requirements increase
Solution Approach 1:
The patent uses the nuclear waste itself as the gamma ray source. The radioactive material within the canister emits gamma rays that naturally pass through the weld structures, eliminating the need for external gamma ray generators or complex radiation delivery systems.
Solution Approach 2:
The patent makes the nuclear waste serve multiple functions: it is both the hazardous material to be contained and the gamma ray source for inspection. This multi-functionality eliminates the need for separate inspection equipment and reduces overall system complexity.
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 allows for efficient and reliable inspection of welds in nuclear waste canisters, ensuring the containment of hazardous materials and reducing the risk of leakage, thereby enhancing the safety and effectiveness of nuclear waste storage solutions.
Implementation Method 1
receiving, at the gamma ray image detector, gamma rays from the nuclear waste that travel through one or more voids in the weld
Implementation Method 2
generating an image of the received gamma rays with the gamma ray image detector; and based on the generated image, determining an integrity of the at least one weld
Data Source
AI summary
Techniques for inspecting a weld of a nuclear waste canister include positioning a gamma ray image detector near a nuclear waste canister that encloses nuclear waste. The nuclear waste canister includes a housing that includes a volume in which the waste is enclosed and a top connected to the housing with at least one weld to seal the nuclear waste in the nuclear waste canister. The techniques further include receiving, at the gamma ray image detector, gamma rays from the nuclear waste that travel through one or more voids in the weld; generating an image of the received gamma rays with the gamma ray image detector; and based on the generated image, determining an integrity of the at least one weld.