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Article

Flattening of the Power Distribution in the HTGR Core with Structured Control Rods

1
National Center for Nuclear Research, Division of Nuclear Energy and Environmental Studies, Andrzeja Sołtana 7, 05-400 Otwock, Poland
2
Faculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Changhyun Roh
Energies 2021, 14(21), 7377; https://doi.org/10.3390/en14217377
Received: 21 September 2021 / Revised: 19 October 2021 / Accepted: 28 October 2021 / Published: 5 November 2021
(This article belongs to the Special Issue Nulcear Energy and Technology)
Control rods (CRs) have a significant influence on reactor performance. Withdrawal of a control rod leaves a region of the core significantly changed due to lack of absorber, leading to increased fission rate and later to Xe135 buildup. In this paper, an innovative concept of structured control rods made of tungsten is studied. It is demonstrated that the radial division of control rods made of tungsten can effectively compensate for the reactivity loss during the irradiation cycle of high-temperature gas-cooled reactors (HTGRs) with a prismatic core while flattening the core power distribution. Implementation of the radial division of control rods enables an operator to reduce this effect in terms of axial power because the absorber is not completely removed from a reactor region, but its amount is reduced. The results obtained from the characteristic evolution of the reactor core for CRs with a structured design in the burnup calculation using the refined timestep scheme show a very stable core evolution with a reasonably low deviation of the power density and Xe135 concentration from the average values. It is very important that all the distributions improve with burnup. View Full-Text
Keywords: HTGR core design; control rods; Xe135 oscillations; tungsten; MC burnup calculations HTGR core design; control rods; Xe135 oscillations; tungsten; MC burnup calculations
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MDPI and ACS Style

Górkiewicz, M.; Cetnar, J. Flattening of the Power Distribution in the HTGR Core with Structured Control Rods. Energies 2021, 14, 7377. https://doi.org/10.3390/en14217377

AMA Style

Górkiewicz M, Cetnar J. Flattening of the Power Distribution in the HTGR Core with Structured Control Rods. Energies. 2021; 14(21):7377. https://doi.org/10.3390/en14217377

Chicago/Turabian Style

Górkiewicz, Michał, and Jerzy Cetnar. 2021. "Flattening of the Power Distribution in the HTGR Core with Structured Control Rods" Energies 14, no. 21: 7377. https://doi.org/10.3390/en14217377

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