Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions

The objective of this paper is to analyze the ability of a VVER-1000 core and its control system to cope with a hypothetical main steam line break (MSLB) accident in case of multiple equipment failures. The study involves the use of advanced 3D core calculation models benchmarked and validated for r...

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Autores principales:	Mitkov Svetlomir, Spasov Ivan, Kolev Nikola
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/2106946a12504148a5f81fb79874d6de
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spelling	oai:doaj.org-article:2106946a12504148a5f81fb79874d6de2021-12-02T17:12:13ZThermal-hydraulic analysis of a VVER-1000 core in MSLB conditions2267-124210.1051/e3sconf/202132701013https://doaj.org/article/2106946a12504148a5f81fb79874d6de2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/103/e3sconf_pepm2021_01013.pdfhttps://doaj.org/toc/2267-1242The objective of this paper is to analyze the ability of a VVER-1000 core and its control system to cope with a hypothetical main steam line break (MSLB) accident in case of multiple equipment failures. The study involves the use of advanced 3D core calculation models benchmarked and validated for reactivity accidents in preceding studies. A MSLB core boundary condition problem is solved on a coarse (nodal) mesh with the coupled COBAYA/CTF neutronic/thermal hydraulic codes. The core thermal-hydraulic boundary conditions are obtained from a preceding full-plant MSLB simulation. The assessment of the core safety parameters is supplemented by a fine-mesh (sub-channel) thermal-hydraulic analysis of the hottest assemblies with the CTF code using information from the 3D nodal COBAYA/CTF calculations. Thirteen variants of a pessimistic MSLB scenario are considered, each of them assuming a number of equipment failures aggravated by eight control rods stuck out of the core after scram at different locations in the overcooled sector. The results (within the limitations of the adopted modeling assumptions) show that the core safety parameters do not exceed the safety limits in the simulated aggravated reactivity accidents.Mitkov SvetlomirSpasov IvanKolev NikolaEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 327, p 01013 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Mitkov Svetlomir Spasov Ivan Kolev Nikola Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
description	The objective of this paper is to analyze the ability of a VVER-1000 core and its control system to cope with a hypothetical main steam line break (MSLB) accident in case of multiple equipment failures. The study involves the use of advanced 3D core calculation models benchmarked and validated for reactivity accidents in preceding studies. A MSLB core boundary condition problem is solved on a coarse (nodal) mesh with the coupled COBAYA/CTF neutronic/thermal hydraulic codes. The core thermal-hydraulic boundary conditions are obtained from a preceding full-plant MSLB simulation. The assessment of the core safety parameters is supplemented by a fine-mesh (sub-channel) thermal-hydraulic analysis of the hottest assemblies with the CTF code using information from the 3D nodal COBAYA/CTF calculations. Thirteen variants of a pessimistic MSLB scenario are considered, each of them assuming a number of equipment failures aggravated by eight control rods stuck out of the core after scram at different locations in the overcooled sector. The results (within the limitations of the adopted modeling assumptions) show that the core safety parameters do not exceed the safety limits in the simulated aggravated reactivity accidents.
format	article
author	Mitkov Svetlomir Spasov Ivan Kolev Nikola
author_facet	Mitkov Svetlomir Spasov Ivan Kolev Nikola
author_sort	Mitkov Svetlomir
title	Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
title_short	Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
title_full	Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
title_fullStr	Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
title_full_unstemmed	Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions
title_sort	thermal-hydraulic analysis of a vver-1000 core in mslb conditions
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/2106946a12504148a5f81fb79874d6de
work_keys_str_mv	AT mitkovsvetlomir thermalhydraulicanalysisofavver1000coreinmslbconditions AT spasovivan thermalhydraulicanalysisofavver1000coreinmslbconditions AT kolevnikola thermalhydraulicanalysisofavver1000coreinmslbconditions
_version_	1718381423096758272

Thermal-hydraulic analysis of a VVER-1000 core in MSLB conditions

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