Modeling Method for Random Distribution of Triso Fuel Particles in FCM Fuel Elements

Abstract

A method for modeling random distribution of TRISO fuel particles in an FCM fuel element, the method comprising the steps of: 1. setting the number of TRISO fuel particles, the size of the fuel element, the width of the fuel-free zone, and the radius of each layer of the TRISO fuel particles; 2. . Randomly generate the spherical center coordinates of TRISO fuel particles, and judge whether the coordinates are within the limits of the FCM fuel element, if not, regenerate the coordinates; 3. Starting from the i-th (i>1) TRISO fuel particles, judge and Whether each fuel particle constructed has a geometric overlap, and if it overlaps, the coordinates will be regenerated; 4. Establish the multi-layer geometry of the TRISO fuel particle and store the coordinates of the i-th fuel particle; 5. Determine whether the number of TRISO fuel particles is satisfied, If it is not satisfied, go back to step 2 and continue to generate coordinates; 6. Create the FCM fuel element geometry, use Boolean operations to distinguish fuel elements and TRISO fuel particles, and the modeling ends.

Description

technical field [0001] The invention relates to modeling of random distribution of TRISO fuel particles and belongs to the technical field, in particular to a modeling method for random distribution of TRISO fuel particles in FCM fuel elements. Background technique [0002] Full ceramic microcapsule (FCM) fuel is a kind of dispersed fuel element, and it is one of the important candidates in the new generation fuel concept Accident Tolerant Fuel (ATF). In terms of structure, the FCM fuel element contains a large number of triple-coated isotropic (TRISO) fuel particles, that is, the TRISO fuel particles are dispersed in the matrix to form the FCM fuel element. Buffer (loose pyrolytic carbon layer), IPyC (inner dense pyrolytic carbon layer), CVD-SiC (silicon carbide layer) and OPyC (outer dense pyrolytic carbon layer) are wrapped layer by layer outside the fuel core to form TRISO Fuel particles, and then randomly disperse TRISO particles in the matrix to form FCM fuel. Theref...

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Problems solved by technology

[0005] For example, in the document "D. Schappela, K. Terrani. Modeling the performance of TRISO-based fully ceramic matrix (FCM) fuel in an LWR environment using BISON. Nuclear Engineering and Design 335 (2018) 116–127.", the author adopted a The randomly distributed script establishes the FCM fuel pellet model with a radius of 4.72mm and a height of 13.5mm, but the disadvantage is that in order to save computing resources, the five-layer structure of TRISO fuel particles is simplified to a single-layer structure, that is, only the The geometry and physical properties of the outermost layer of OPyC are also selected from the physical properties of the outer dense pyrolytic carbon layer

[0008] To sum up, there are few research literatures on FCM fuel at home and abroad, and the modeling methods for FCM fuel elements have certain limitations. The geometry of TRISO fuel particles is relatively rough, and the geometry of FCM fuel elements cannot be fully simulated. Structure and behavior in the heap

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