Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method

A dry method is one of fuel debris retrieval methods for decommissioning of TEPCO’s Fukushima Daiichi nuclear power station. However, the cooling of fuel debris must be fully maintained without water. Japan Atomic Energy Agency (JAEA) has evaluated the air-cooling performance of the fuel debris in t...

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Autores principales:	Shinichiro UESAWA, Susumu YAMASHITA, Mitsuhiko SHIBATA, Hiroyuki YOSHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	fukushima daiichi npp decommissioning dry method free convection heat transfer jupiter validation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/06c2e89e3ff24b8a8aa193e1ff306814
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spelling	oai:doaj.org-article:06c2e89e3ff24b8a8aa193e1ff3068142021-11-26T07:21:52ZValidation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method2187-974510.1299/mej.18-00115https://doaj.org/article/06c2e89e3ff24b8a8aa193e1ff3068142018-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/4/5_18-00115/_pdf/-char/enhttps://doaj.org/toc/2187-9745A dry method is one of fuel debris retrieval methods for decommissioning of TEPCO’s Fukushima Daiichi nuclear power station. However, the cooling of fuel debris must be fully maintained without water. Japan Atomic Energy Agency (JAEA) has evaluated the air-cooling performance of the fuel debris in the dry method by using JUPITER. Because JUPITER can represent the relocation of the corium, the unknown parameters, such as the composition and the position of the fuel debris at the RPV pedestal, can be reduced. By calculating the heat transfer of the fuel debris based on the corium relocation obtained with JUPITER, more accurate analysis of the air-cooling performance of the fuel debris in the dry method is expected. In order to evaluate the air-cooling performance of fuel debris in the dry method by using JUPITER, the validation of the free-convective heat transfer analysis of JUPITER were performed in this paper. In order to qualitatively evaluate results of JUPITER for configurations closer to experimental conditions and to decide physical values and positions to be measured in the validation, JUPITER was compared with OpenFOAM for the simple cuboid configuration which has the heating and cooling surfaces at the floor and the ceiling, respectively. The comparison proved that JUPITER can calculate the vertical temperature distribution as well as OpenFOAM on the condition of the lower heating amount. In the validation, JUPITER was compared with the heat transfer experiments of free convection in air adjacent to an upward-facing horizontal heating surface. The comparison proved that JUPITER was in good agreement with the experiment on the condition of the lower heating-surface temperature. The result indicated that JUPITER is a helpful numerical method to evaluate the free-convective heat transfer of the fuel debris in the dry method.Shinichiro UESAWASusumu YAMASHITAMitsuhiko SHIBATAHiroyuki YOSHIDAThe Japan Society of Mechanical Engineersarticlefukushima daiichi nppdecommissioningdry methodfree convectionheat transferjupitervalidationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 4, Pp 18-00115-18-00115 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	fukushima daiichi npp decommissioning dry method free convection heat transfer jupiter validation Mechanical engineering and machinery TJ1-1570
spellingShingle	fukushima daiichi npp decommissioning dry method free convection heat transfer jupiter validation Mechanical engineering and machinery TJ1-1570 Shinichiro UESAWA Susumu YAMASHITA Mitsuhiko SHIBATA Hiroyuki YOSHIDA Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
description	A dry method is one of fuel debris retrieval methods for decommissioning of TEPCO’s Fukushima Daiichi nuclear power station. However, the cooling of fuel debris must be fully maintained without water. Japan Atomic Energy Agency (JAEA) has evaluated the air-cooling performance of the fuel debris in the dry method by using JUPITER. Because JUPITER can represent the relocation of the corium, the unknown parameters, such as the composition and the position of the fuel debris at the RPV pedestal, can be reduced. By calculating the heat transfer of the fuel debris based on the corium relocation obtained with JUPITER, more accurate analysis of the air-cooling performance of the fuel debris in the dry method is expected. In order to evaluate the air-cooling performance of fuel debris in the dry method by using JUPITER, the validation of the free-convective heat transfer analysis of JUPITER were performed in this paper. In order to qualitatively evaluate results of JUPITER for configurations closer to experimental conditions and to decide physical values and positions to be measured in the validation, JUPITER was compared with OpenFOAM for the simple cuboid configuration which has the heating and cooling surfaces at the floor and the ceiling, respectively. The comparison proved that JUPITER can calculate the vertical temperature distribution as well as OpenFOAM on the condition of the lower heating amount. In the validation, JUPITER was compared with the heat transfer experiments of free convection in air adjacent to an upward-facing horizontal heating surface. The comparison proved that JUPITER was in good agreement with the experiment on the condition of the lower heating-surface temperature. The result indicated that JUPITER is a helpful numerical method to evaluate the free-convective heat transfer of the fuel debris in the dry method.
format	article
author	Shinichiro UESAWA Susumu YAMASHITA Mitsuhiko SHIBATA Hiroyuki YOSHIDA
author_facet	Shinichiro UESAWA Susumu YAMASHITA Mitsuhiko SHIBATA Hiroyuki YOSHIDA
author_sort	Shinichiro UESAWA
title	Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
title_short	Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
title_full	Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
title_fullStr	Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
title_full_unstemmed	Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method
title_sort	validation of free-convective heat transfer analysis with jupiter to evaluate air-cooling performance of fuel debris in dry method
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/06c2e89e3ff24b8a8aa193e1ff306814
work_keys_str_mv	AT shinichirouesawa validationoffreeconvectiveheattransferanalysiswithjupitertoevaluateaircoolingperformanceoffueldebrisindrymethod AT susumuyamashita validationoffreeconvectiveheattransferanalysiswithjupitertoevaluateaircoolingperformanceoffueldebrisindrymethod AT mitsuhikoshibata validationoffreeconvectiveheattransferanalysiswithjupitertoevaluateaircoolingperformanceoffueldebrisindrymethod AT hiroyukiyoshida validationoffreeconvectiveheattransferanalysiswithjupitertoevaluateaircoolingperformanceoffueldebrisindrymethod
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Validation of free-convective heat transfer analysis with JUPITER to evaluate air-cooling performance of fuel debris in dry method

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