Computational and Experimental Method for Determination of the Inertia of Thermocouples within the Framework of Pre-Reactor Tests of Experimental Fuel Rods

When studying the properties of candidate materials for fuel elements of designed nuclear power plants, the most important role is played by conducting reactor experiments. To obtain information about the temperature change of samples of experimental fuel rods in real time, they are instrumented wit...

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Bibliographic Details
Published in:Physics of atomic nuclei 2023-12, Vol.86 (12), p.2577-2584
Main Authors: Arefinkina, S. E., Abramov, A. N., Babenko, A. V., Gerstle, A. D., Dmitrieva, N. A., Erak, D. Yu, Efremov, P. K., Mikhin, O. V., Nichiporenko, Yu. B., Yakovlev, V. V.
Format: Article
Language:English
Subjects:
Error analysis
Experimental methods
Inertia
Materials selection
Nuclear fuel elements
Nuclear power plants
Particle and Nuclear Physics
Physics
Physics and Astronomy
Prototypes
Research facilities
Research methodology
Theoretical and Experimental Physics of Nuclear Reactors
Thermocouples
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Summary:When studying the properties of candidate materials for fuel elements of designed nuclear power plants, the most important role is played by conducting reactor experiments. To obtain information about the temperature change of samples of experimental fuel rods in real time, they are instrumented with thermocouples. The correctness of the performed measurements depends on various factors, an important one of which is the quality of the thermocouple seal on the surface of the test sample. As part of the preparation for conducting fuel experiments at the IR-8 reactor of the National Research Center Kurchatov Institute, it is necessary to conduct pre-reactor tests of experimental fuel rods and their prototypes. This article discusses a computational and experimental method, the use of which makes it possible to obtain the inertia of thermocouples attached to the test object in various ways. Requirements for the inertia of thermocouples used during testing are determined on the basis of the parameters of the considered nonstationary processes. Comparison of the total inertias of the fixed thermocouples and the experimental prototype can also be used to draw conclusions about the quality of the embedment. To test the proposed method for determining inertia, a special laboratory rig was created on which experimental values were obtained for thermocouples attached to the surface of the sample in two ways. A description and results of testing an analytical model for determining the error in measuring the sample temperature using thermocouples are provided. The possibilities of using the developed computational and experimental method in preparing reactor research of experimental fuel rods are considered.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778823120013