CRUD Deposit Power Transfer Analysis via SEM Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods fail to accurately measure power transfer characteristics of nuclear fuel assemblies with accumulated CRUD deposits, particularly in unmonitored regions of the reactor core, leading to inefficient operation and economic losses due to fuel depletion and heat transfer inefficiencies.
Innovation Solution
A method involving scanning electron microscope image analysis to determine the number and size of capillaries and steam chimneys in CRUD deposits on nuclear fuel rods, allowing for calculation of power transfer characteristics and heat flux, which can be applied to both fuel rods and steam generator tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in-core monitors are placed within the core to measure power generation at specified positions, then measurement precision of power output is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses scanning electron microscope imaging to create detailed copies/maps of CRUD deposit surfaces, allowing indirect measurement of heat transfer characteristics without placing physical monitors in all core locations. The surface topology images serve as proxies for direct power measurement.
Solution Approach 2:
The patent replaces mechanical/physical monitoring devices with an imaging-based analytical system. Instead of using in-core power monitors that require physical insertion into the reactor core, the method uses SEM imaging combined with computational analysis of CRUD surface features to infer power transfer characteristics.
2Reliability
If conservative assumptions are made for non-measured assemblies, then safety margins are maintained, but productivity and fuel utilization decrease
Solution Approach 1:
The patent replaces conservative assumption-based calculations with imaging-based empirical analysis. By using SEM images to directly assess CRUD deposit characteristics and calculate heat transfer coefficients, operators can determine actual fuel assembly performance rather than relying on conservative estimates, thereby improving fuel utilization while maintaining safety.
Solution Approach 2:
The patent changes the approach from using fixed conservative parameters to dynamically calculated parameters based on actual CRUD deposit morphology. The heat transfer coefficient is not assumed but calculated from measured surface area ratios and deposit characteristics, allowing more accurate assessment of fuel assembly performance.
3Measurement precision
If CRUD deposit analysis is performed to understand heat transfer mechanisms, then measurement precision of power transfer is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the complex problem of measuring power transfer through CRUD deposits into manageable components: (1) obtaining SEM images of CRUD surfaces, (2) analyzing surface topology features, (3) calculating surface area ratios, and (4) determining heat transfer coefficients. This stepwise approach makes the measurement process systematic and manageable.
Solution Approach 2:
The patent introduces an intermediary analytical framework that connects observable CRUD surface features to unobservable heat transfer characteristics. The surface area ratio serves as an intermediary parameter that can be measured from images and then used to calculate the heat transfer coefficient, bridging the gap between what can be observed and what needs to be determined.
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
Provides a detailed, objective, and cost-effective analysis of CRUD heat transfer mechanisms, correlating localized neutron flux with heat production, improving the accuracy of power measurement and extending the useful life of nuclear fuel assemblies.
Implementation Method 1
A method involving scanning electron microscope image analysis to determine the number and size of capillaries and steam chimneys in CRUD deposits
Implementation Method 2
Provides a detailed, objective, and cost-effective analysis of CRUD heat transfer mechanisms
Implementation Method 3
determine the number and size of capillaries and steam chimneys in CRUD deposits
Implementation Method 4
determine the number and size of capillaries and steam chimneys in CRUD deposits
Data Source
Figure 1
AI summary
A method to characterize the power transfer of a nuclear component is provided including the steps of obtaining a sample of a deposit layer on a side of a nuclear component, obtaining a scanning electron microscope image of an outside surface of the sample, obtaining a scanning electron microscope image of an inside surface of the sample, analyzing the scanning electron microscope images of the outside and inside surfaces of the sample for a presence of capillaries and steam chimneys, and calculating the power transfer of the component based on a number of steam chimneys in the deposit layer.