An Online Calculation Method Applicable to Physical Thermal Engineering Coupling of Nuclear Reactor Components

Abstract

An online calculation method suitable for the physical thermal engineering coupling of nuclear reactor components, which accurately and reasonably models the different two-dimensional components in the three-dimensional components of the pressurized water reactor; completes the update of the input file through the physical thermal engineering coupling interface program, and calls the accurate two-dimensional Component program calculation to realize cross-section update; call the 3D transport solver to obtain the power distribution of the whole component, and after power reconstruction, transfer the data to the thermal program calculation to obtain the working condition distribution of the whole component, and reconstruct the working condition to realize the physical Mesh matching of thermal engineering program; calling the physical thermal engineering coupling interface program to determine whether the nuclear thermal coupling calculation is converged; this method reasonably models the components, calls the accurate transport solver, and solves the homogenization introduced in the nuclear thermal coupling calculation Error problems, and online calculation of component cross-sections to update cross-sections, and grid matching through physical grid power reconfiguration and thermal grid reconfiguration, avoiding errors in cross-section fitting and grid approximate matching.

Description

technical field [0001] The invention relates to the field of nuclear reactor physics calculations, in particular to an online calculation method suitable for the coupling of physics, heat and engineering of nuclear reactor components. Background technique [0002] Today, as design conditions and calculation accuracy requirements continue to increase, the field of nuclear reactor design hopes to achieve high-fidelity reactor physical calculations through accurate modeling and minimize the approximation and errors introduced in the upstream reactor calculation process. Analyze simulations. [0003] The core of the coupled calculation of physical and thermal engineering of nuclear reactor components is the matching of cross-section update and physical thermal grid. Under the current computing conditions of computers, the process of using deterministic programs to conduct coupled calculation and analysis of physics, heat and engineering can generally be divided into three steps...

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Problems solved by technology

[0009] 2. The second is to call the fitting relational formula of the few group parameters offline to update the section. The error generated during the fitting is difficult to carry out quantitative analysis, and the error brought here cannot be estimated;

[0010] 3. Finally, the grid of physical calculation and the grid of thermal program calculation are often inconsistent. If the grid is approximated, the error in it is also difficult to judge

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