Non-invasive Nuclear Reactor Core Imaging via Muon Detection
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Solution Overview
Problem
Current methods for inspecting nuclear reactor cores are invasive, risky due to radiation exposure, and provide limited, partial views of fuel conditions, making it difficult to assess damage and guide remedial actions effectively.
Innovation Solution
Non-invasive imaging using cosmic-ray muon detector arrays placed outside the reactor enclosure to measure muon scattering and absorption, generating detailed images of nuclear fuel conditions, including the presence of damage or molten fuel, without physical access to the reactor core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video endoscopy is used to inspect reactor core, then visual monitoring is achieved, but radiation exposure risk increases and inspection completeness deteriorates
Solution Approach 1:
The patent uses neutron detectors as intermediary devices placed outside the reactor enclosure to detect neutron radiation indirectly. These detectors act as mediators between the radiation source inside the reactor and the monitoring system, allowing measurement of core conditions without direct human exposure to high radiation zones.
Solution Approach 2:
The patent replaces the mechanical video endoscopy system with a radiation-based detection system using neutron detectors and gamma-ray detectors. This substitution eliminates the need for physical insertion of cameras into the reactor core, thereby avoiding radiation exposure risks while maintaining monitoring capability.
2Loss of information
If video endoscopy is used to inspect reactor core, then monitoring is performed, but inspection completeness and material identification capability deteriorate
Solution Approach 1:
The patent employs a multi-functional detection system that uses both neutron detectors and gamma-ray detectors to simultaneously achieve multiple objectives: monitoring fuel integrity, identifying material types, detecting damage conditions, and assessing overall reactor core status. This universal approach overcomes the limitation of video endoscopy which can only provide visual surface information.
Solution Approach 2:
The patent changes the detection parameter from optical (visual) to nuclear radiation (neutron and gamma-ray). This parameter change enables penetration through reactor enclosures and provides information about material composition and structural integrity that cannot be obtained through visual means alone.
3Loss of information
If invasive inspection methods are used to assess reactor damage, then detailed information is obtained, but time for remedial action decreases due to prolonged inspection
Solution Approach 1:
The patent implements continuous monitoring using neutron detectors and gamma-ray detectors that are already in place or can be quickly deployed outside the reactor enclosure. This preliminary and ongoing detection capability allows for immediate assessment of reactor conditions and rapid decision-making for remedial actions, eliminating the need for time-consuming invasive inspections after an incident.
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
Enables safe, comprehensive monitoring of nuclear reactor cores, providing crucial information on fuel condition and damage assessment, facilitating informed decision-making for remedial actions without exposing personnel to radiation.
Implementation Method 1
the detector arrays measure both muon scattering and absorption to enable imaging and characterizing not only the very high-Z fuel materials
Implementation Method 2
the detector arrays measure both muon scattering and absorption to enable imaging and characterizing not only the very high-Z fuel materials
Data Source
AI summary
Techniques, systems, and devices are disclosed for non-invasive monitoring and imaging of nuclear fuel inside a nuclear reactor using muon detector arrays. In one aspect, these detector arrays are placed outside the reactor vessel or building for investigating the reactors without access to the cores, therefore the imaging process is non-invasive. In some implementation, these detector arrays measure both muon scattering and absorption to enable imaging and characterizing not only the very high-Z fuel materials, but also other materials in the reactor, thereby obtaining a more complete picture of reactor status. When applied to damaged reactors, the disclosed proposed techniques, systems, and devices, through the process of providing an image, can reveal the presence (or absence) of damage to fuel rod assemblies or puddles of molten fuel at the bottom of the containment vessel, thus providing crucial information to guide decisions about remedial actions.