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

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...

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Autores principales:	Michał Górkiewicz, Jerzy Cetnar
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	HTGR core design control rods Xe135 oscillations tungsten MC burnup calculations Technology T
Acceso en línea:	https://doaj.org/article/b9ed7db5c61148eab9024767bd6d42bf
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id	oai:doaj.org-article:b9ed7db5c61148eab9024767bd6d42bf
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spelling	oai:doaj.org-article:b9ed7db5c61148eab9024767bd6d42bf2021-11-11T16:05:47ZFlattening of the Power Distribution in the HTGR Core with Structured Control Rods10.3390/en142173771996-1073https://doaj.org/article/b9ed7db5c61148eab9024767bd6d42bf2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7377https://doaj.org/toc/1996-1073Control 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.Michał GórkiewiczJerzy CetnarMDPI AGarticleHTGR core designcontrol rodsXe135 oscillationstungstenMC burnup calculationsTechnologyTENEnergies, Vol 14, Iss 7377, p 7377 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	HTGR core design control rods Xe135 oscillations tungsten MC burnup calculations Technology T
spellingShingle	HTGR core design control rods Xe135 oscillations tungsten MC burnup calculations Technology T Michał Górkiewicz Jerzy Cetnar Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
description	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.
format	article
author	Michał Górkiewicz Jerzy Cetnar
author_facet	Michał Górkiewicz Jerzy Cetnar
author_sort	Michał Górkiewicz
title	Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
title_short	Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
title_full	Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
title_fullStr	Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
title_full_unstemmed	Flattening of the Power Distribution in the HTGR Core with Structured Control Rods
title_sort	flattening of the power distribution in the htgr core with structured control rods
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b9ed7db5c61148eab9024767bd6d42bf
work_keys_str_mv	AT michałgorkiewicz flatteningofthepowerdistributioninthehtgrcorewithstructuredcontrolrods AT jerzycetnar flatteningofthepowerdistributioninthehtgrcorewithstructuredcontrolrods
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Flattening of the Power Distribution in the HTGR Core with Structured Control Rods

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