Advanced Particle Method for Nuclear Reactor Severe Accident Analysis
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Solution Overview
Problem
Current methods for analyzing severe accidents in nuclear reactors lack comprehensive analysis of key phenomena such as mechanical structure changes, fluid motion, heat transfer, and neutron physics, which are crucial for safety characterization and accident mitigation.
Innovation Solution
An advanced particle method is employed to analyze severe accidents in nuclear reactors, incorporating particle geometry models, material property updates, mechanical structure calculations, thermal hydraulic calculations, chemical reaction assessments, and neutron physics analysis to capture cross-sectional changes and phase changes accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional analysis methods are used for severe accidents in nuclear reactors, then the analysis can be performed with simpler models, but the analysis lacks comprehensive coverage of key phenomena such as mechanical structure changes, fluid motion, heat transfer, and neutron physics
Solution Approach 1:
The patent combines multiple analysis modules (mechanical structure, fluid motion, heat transfer, phase change, chemical reaction, and neutron physics) into a unified particle method framework. This merging allows comprehensive analysis of severe accident phenomena while maintaining a consistent computational approach across all physical processes.
Solution Approach 2:
The particle method serves as a universal computational framework that can handle diverse physical phenomena simultaneously. Each particle carries multiple properties (mass, energy, momentum, chemical composition) and can represent different materials and phases, enabling the model to address mechanical, thermal, hydraulic, and nuclear aspects within a single methodology.
2Manufacturing precision
If traditional grid-based methods are used for analyzing severe accidents, then the computational framework is well-established, but mesh distortion problems occur during large deformation and phase change processes
Solution Approach 1:
The patent replaces the traditional grid-based mechanical framework with a particle-based approach. Instead of deforming mesh elements, material is represented by discrete particles that can freely move, change phase, and interact through defined interaction rules. This substitution eliminates mesh distortion while maintaining geometric accuracy through particle position tracking.
Solution Approach 2:
The particle method allows dynamic changes in particle properties (phase, temperature, pressure, velocity) without requiring changes to the underlying computational framework. Particles can transition between solid, liquid, and gas phases by modifying their state parameters, avoiding the need for remeshing or complex grid adaptation.
3Measurement precision
If comprehensive multi-physics analysis is implemented, then the safety characterization is improved, but the computational cost and complexity increase significantly
Solution Approach 1:
The system segments the complex multi-physics problem into distinct particle interaction modules (mechanical collisions, thermal exchange, mass transfer, chemical reactions, neutron interactions). Each module can be computed independently and efficiently, allowing parallel processing and reducing overall computational burden while maintaining comprehensive analysis capability.
Data Source
AI summary
A method for analyzing a sever accident in a nuclear reactor based on an advanced particle method includes steps of: 1) performing geometric modeling, setting initial conditions and boundary conditions; 2) updating material physical properties and key parameters; 3) performing mechanical structure module calculation, updating solid particle stress, strain, internal energy, displacement and velocity; 4) performing thermal hydraulic module calculation, updating fluid particle internal energy, position and velocity; 5) performing chemical reaction module calculation, updating particle matter composition and internal energy; 6) performing neutron physics module calculation, updating particle neutron flux density; and 7) outputting data. The method of the present invention is based on the discrete form of the advanced particle method, which is capable of accurately capturing cross-sectional changes, matter changes, and phase changes. Compared with grid method, the present invention can effectively avoid a mesh distortion problem existing in a large deformation.