Building a model of damage to the fractal structure of the shell of the fuel element of a nuclear reactor

Authors

DOI:

https://doi.org/10.15587/1729-4061.2022.263374

Keywords:

fuel element shell, shell damage model, fractal structure, fractal dimensionality

Abstract

This paper considers the physical processes in the structure of the material for a heat-emitting fuel element (FE) shell, caused by various damaging defects, on its outer and inner surfaces, and affecting the change in the geometric parameters of a nuclear reactor’s FE.

The task to improve the model of damage to an FE shell is being solved, taking into consideration structural and phase changes in the material of the shell with damaging defects on the outer and inner surfaces, in order to establish the actual criterion for assessing the FE hermeticity degree.

It is proposed to study the structure of the shell material with damaging defects (macropores and microcracks), which is a porous heterogeneous structure with fractal properties of self-similarity and scalability, to use the apparatus of fractal geometry.

A physical model of the FE shell has been built and proposed, in the form of a geometric cylinder-shaped figure, which makes it possible to investigate the fractal properties of the structure of the material of the damaged shell and their influence on a change in the geometric parameters of FE

An improved model of damage to the FE shell was derived, which makes it possible to take into consideration fractal increases in the geometric parameters of FE, for the established values of the fractal dimensionality.

Experimental studies of the FE shell, using the skin effect, confirmed the theoretical results and showed the validity of the choice of practical use of the fractal dimensionality parameter as an effective criterion for assessing the hermeticity degree of an FE shell. It has been experimentally established that the value of the fractal dimensionality of 2.68 corresponds to the maximum degree of damage to the shell for a leaky FE.

Author Biographies

Pavlo Budanov, Ukrainian Engineering Pedagogics Academy

PhD, Associate Professor

Department of Physics, Electrical Engineering and Power Engineering

Eduard Khomiak, Ukrainian Engineering Pedagogics Academy

PhD, Associate Professor

Department of Physics, Electrical Engineering and Power Engineering

Ihor Kyrysov, Ukrainian Engineering Pedagogics Academy

Senior Lecturer

Department of Physics, Electrical Engineering and Power Engineering

Kostiantyn Brovko, Ukrainian Engineering Pedagogics Academy

PhD, Associate Professor

Department of Physics, Electrical Engineering and Power Engineering

Sergiy Kalnoy, Ivan Kozhedub Kharkiv National Air Force University

PhD, Associate Professor

Department of Physics and Radio Electronics

Oleh Karpenko, Ivan Kozhedub Kharkiv National Air Force University

PhD, Associate Professor

Department of Physics and Radio Engineering

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Published

2022-08-29

How to Cite

Budanov, P., Khomiak, E., Kyrysov, I., Brovko, K., Kalnoy, S., & Karpenko, O. (2022). Building a model of damage to the fractal structure of the shell of the fuel element of a nuclear reactor . Eastern-European Journal of Enterprise Technologies, 4(8 (118), 60–70. https://doi.org/10.15587/1729-4061.2022.263374

Issue

Vol. 4 No. 8 (118) (2022): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2022 Pavlo Budanov, Eduard Khomiak, Ihor Kyrysov, Kostiantyn Brovko, Sergiy Kalnoy, Oleh Karpenko

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