Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors

Many sensitivity calculations are necessary to evaluate the effect of the uncertainties of Core Disruptive Accident (CDA) scenarios on debris bed coolability for Sodium-cooled Fast Reactors (SFR). This paper describes a calculation model and a technique for high-speed calculations of debris bed cool...

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Autores principales:	Eiji MATSUO, Kyohei SASA, Yutaka ABE, Akihiro SHIBATA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	sodium-cooled fast reactor debris bed coolability high-speed calculation streamlined calculation model speed-up technique Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/15a1751c0a364668b8b70ea0dc91d3da
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spelling	oai:doaj.org-article:15a1751c0a364668b8b70ea0dc91d3da2021-11-29T05:53:24ZStudy on high-speed calculation of debris bed coolability for sodium-cooled fast reactors2187-974510.1299/mej.19-00457https://doaj.org/article/15a1751c0a364668b8b70ea0dc91d3da2020-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/2/7_19-00457/_pdf/-char/enhttps://doaj.org/toc/2187-9745Many sensitivity calculations are necessary to evaluate the effect of the uncertainties of Core Disruptive Accident (CDA) scenarios on debris bed coolability for Sodium-cooled Fast Reactors (SFR). This paper describes a calculation model and a technique for high-speed calculations of debris bed coolability. Firstly, the detailed coolability calculation model taking into account phase change and vapor-liquid advection for a boiling zone in the debris bed is derived as a single equation. The vapor-liquid advection is based on the momentum equation including inertial, viscous, capillary and gravitational effects. In addition, the streamlined calculation which ignores inertial and gravitational effects for the boiling zone is proposed. Secondly, both the detailed and streamlined calculation models are validated through the analysis of the Sandia ACRR-D10 in-pile experiments. Then, the effects of the ignoring on debris bed coolability are evaluated through sensitivity calculations. Thirdly, the speed-up technique for the streamlined calculation model is proposed which solves the boiling zone by the combination of transient and steady state calculations and allows using coarse mesh size and time step. Owing to the technique, the calculation time becomes about 1/50. The application of the speed-up technique to the streamlined calculation model is confirmed under typical SFR conditions. Finally, it is demonstrated that the streamlined calculation model and the speed-up technique enable us to perform many sensitivity calculations in a realistic time. The model and technique developed in this study is practical to evaluate the effect of the uncertainties of CDA scenarios on debris bed coolability for SFR.Eiji MATSUOKyohei SASAYutaka ABEAkihiro SHIBATAThe Japan Society of Mechanical Engineersarticlesodium-cooled fast reactordebris bed coolabilityhigh-speed calculationstreamlined calculation modelspeed-up techniqueMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 2, Pp 19-00457-19-00457 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	sodium-cooled fast reactor debris bed coolability high-speed calculation streamlined calculation model speed-up technique Mechanical engineering and machinery TJ1-1570
spellingShingle	sodium-cooled fast reactor debris bed coolability high-speed calculation streamlined calculation model speed-up technique Mechanical engineering and machinery TJ1-1570 Eiji MATSUO Kyohei SASA Yutaka ABE Akihiro SHIBATA Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
description	Many sensitivity calculations are necessary to evaluate the effect of the uncertainties of Core Disruptive Accident (CDA) scenarios on debris bed coolability for Sodium-cooled Fast Reactors (SFR). This paper describes a calculation model and a technique for high-speed calculations of debris bed coolability. Firstly, the detailed coolability calculation model taking into account phase change and vapor-liquid advection for a boiling zone in the debris bed is derived as a single equation. The vapor-liquid advection is based on the momentum equation including inertial, viscous, capillary and gravitational effects. In addition, the streamlined calculation which ignores inertial and gravitational effects for the boiling zone is proposed. Secondly, both the detailed and streamlined calculation models are validated through the analysis of the Sandia ACRR-D10 in-pile experiments. Then, the effects of the ignoring on debris bed coolability are evaluated through sensitivity calculations. Thirdly, the speed-up technique for the streamlined calculation model is proposed which solves the boiling zone by the combination of transient and steady state calculations and allows using coarse mesh size and time step. Owing to the technique, the calculation time becomes about 1/50. The application of the speed-up technique to the streamlined calculation model is confirmed under typical SFR conditions. Finally, it is demonstrated that the streamlined calculation model and the speed-up technique enable us to perform many sensitivity calculations in a realistic time. The model and technique developed in this study is practical to evaluate the effect of the uncertainties of CDA scenarios on debris bed coolability for SFR.
format	article
author	Eiji MATSUO Kyohei SASA Yutaka ABE Akihiro SHIBATA
author_facet	Eiji MATSUO Kyohei SASA Yutaka ABE Akihiro SHIBATA
author_sort	Eiji MATSUO
title	Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
title_short	Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
title_full	Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
title_fullStr	Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
title_full_unstemmed	Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
title_sort	study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/15a1751c0a364668b8b70ea0dc91d3da
work_keys_str_mv	AT eijimatsuo studyonhighspeedcalculationofdebrisbedcoolabilityforsodiumcooledfastreactors AT kyoheisasa studyonhighspeedcalculationofdebrisbedcoolabilityforsodiumcooledfastreactors AT yutakaabe studyonhighspeedcalculationofdebrisbedcoolabilityforsodiumcooledfastreactors AT akihiroshibata studyonhighspeedcalculationofdebrisbedcoolabilityforsodiumcooledfastreactors
_version_	1718407570459197440

Study on high-speed calculation of debris bed coolability for sodium-cooled fast reactors

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