Fuel Element Radiometric Inspection Positioning Apparatus
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Solution Overview
Problem
Existing systems for inspecting irradiated fuel elements in nuclear reactors face challenges in accurately controlling the position of fuel elements relative to detectors, particularly due to large and complex germanium crystal-based detectors that require liquid nitrogen cooling, and difficulties in precise axial positioning.
Innovation Solution
An apparatus with a frame and positioning means, including support guides and pushing elements, ensures precise positioning of fuel elements during scanning, allowing for reliable measurements using smaller detectors at room temperature, and incorporates adjustable collimators and software for burn-up determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If germanium crystal-based gamma radiation detectors are used for measuring fuel elements, then measurement capability is improved, but device complexity and operational cost increase due to liquid nitrogen cooling requirements
Solution Approach 1:
The patent replaces expensive, complex germanium crystal detectors requiring liquid nitrogen cooling with simpler, room-temperature operational detectors. The invention uses detectors that can function at pool water temperature, eliminating the need for sophisticated cooling systems while maintaining adequate measurement capabilities for fuel element inspection.
Solution Approach 2:
The patent changes the operating temperature parameter of the radiation detectors from requiring liquid nitrogen cooling (cryogenic temperatures) to room temperature or pool water temperature. This parameter change enables the use of simpler detector technologies that do not require complex thermal management systems.
2Productivity
If conventional scanning methods with cranes or fixed detectors are used, then fuel element scanning is possible, but positioning precision deteriorates making it difficult to control distance between detector and fuel element
Solution Approach 1:
The patent introduces positioning means as an intermediary mechanism between the fuel element and the radiation detector. This positioning system includes mechanical guides and adjustment mechanisms that mediate the relative positioning, ensuring precise control of the distance between the detector and fuel element surface during scanning operations.
Solution Approach 2:
The patent incorporates feedback mechanisms through positioning means that monitor and adjust the distance between the fuel element and detector. The positioning system provides real-time control feedback to maintain the correct spacing, ensuring measurement accuracy throughout the scanning process.
3Reliability
If larger gamma radiation detectors are used for accurate measurements, then measurement reliability is improved, but device complexity and size increase
Solution Approach 1:
The patent employs smaller, simpler radiation detectors that operate at room temperature instead of requiring large germanium crystal detectors. The invention demonstrates that adequate measurement reliability can be achieved with compact detectors when proper positioning and calibration are implemented, eliminating the need for large detector volumes.
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 accurate and reliable radiometric inspection of fuel elements with improved positioning control, reducing operational complexity and costs, and optimizing measurements for various reactor types.
Implementation Method 1
at least one radiation detector, which can be a gamma radiation detector and/or a neutron detector
Implementation Method 2
at least one radiation detector, which can be a gamma radiation detector and/or a neutron detector
Data Source
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AI summary
The present invention relates to an apparatus for the radiometric inspection of a fuel element (100) comprising a frame (1) with an opening (2) configured so that the fuel element is moved through said opening, and with positioning means (51, 61) located in correspondence with said opening and configured for keeping at least one surface of the fuel element at a predetermined distance from a radiation detector when the fuel element is moved through said opening.