ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses

We conducted an experiment to clarify nitrogen gas behavior at low pressures during reflux condensation in a pressurized water reactor (PWR) with the rig of safety assessment/large scale test facility (ROSA/LSTF) at Japan Atomic Energy Agency. The primary pressure was lower than 1 MPa under the cons...

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Autores principales:	Takeshi TAKEDA, Iwao OHTSU
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	pwr rosa/lstf nitrogen gas inflow reflux condensation non-uniform flow relap5 code Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/08f08fcb104b47628d959344af22eb64
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spelling	oai:doaj.org-article:08f08fcb104b47628d959344af22eb642021-11-26T07:21:52ZROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses2187-974510.1299/mej.18-00077https://doaj.org/article/08f08fcb104b47628d959344af22eb642018-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/4/5_18-00077/_pdf/-char/enhttps://doaj.org/toc/2187-9745We conducted an experiment to clarify nitrogen gas behavior at low pressures during reflux condensation in a pressurized water reactor (PWR) with the rig of safety assessment/large scale test facility (ROSA/LSTF) at Japan Atomic Energy Agency. The primary pressure was lower than 1 MPa under the constant core power of 0.7% of the volumetric-scaled (1/48) PWR nominal power, unlike a previous related test with the LSTF. Steam generator (SG) secondary-side collapsed liquid level was maintained at a certain liquid level above the SG U-tube height. Nitrogen gas was injected stepwise into each SG inlet plenum at a certain constant amount. The primary pressure and the degree of subcooling of the SG U-tubes were largely dependent on the amount of nitrogen gas accumulated in the SG U-tubes. Nitrogen gas accumulated from the outlet towards the inlet of the SG U-tubes. Non-uniform flow behavior was observed among the SG U-tubes with nitrogen gas ingress. The RELAP5/MOD3.3 code indicated remaining problems in the predictions of the primary pressure and the degree of subcooling of the SG U-tubes depending on the number of nitrogen gas injection. We investigated further the applicability of the RELAP5 code with different models for the SG U-tubes to the prediction of the non-uniform flow behavior through sensitivity analyses.Takeshi TAKEDAIwao OHTSUThe Japan Society of Mechanical Engineersarticlepwrrosa/lstfnitrogen gas inflowreflux condensationnon-uniform flowrelap5 codeMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 4, Pp 18-00077-18-00077 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	pwr rosa/lstf nitrogen gas inflow reflux condensation non-uniform flow relap5 code Mechanical engineering and machinery TJ1-1570
spellingShingle	pwr rosa/lstf nitrogen gas inflow reflux condensation non-uniform flow relap5 code Mechanical engineering and machinery TJ1-1570 Takeshi TAKEDA Iwao OHTSU ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
description	We conducted an experiment to clarify nitrogen gas behavior at low pressures during reflux condensation in a pressurized water reactor (PWR) with the rig of safety assessment/large scale test facility (ROSA/LSTF) at Japan Atomic Energy Agency. The primary pressure was lower than 1 MPa under the constant core power of 0.7% of the volumetric-scaled (1/48) PWR nominal power, unlike a previous related test with the LSTF. Steam generator (SG) secondary-side collapsed liquid level was maintained at a certain liquid level above the SG U-tube height. Nitrogen gas was injected stepwise into each SG inlet plenum at a certain constant amount. The primary pressure and the degree of subcooling of the SG U-tubes were largely dependent on the amount of nitrogen gas accumulated in the SG U-tubes. Nitrogen gas accumulated from the outlet towards the inlet of the SG U-tubes. Non-uniform flow behavior was observed among the SG U-tubes with nitrogen gas ingress. The RELAP5/MOD3.3 code indicated remaining problems in the predictions of the primary pressure and the degree of subcooling of the SG U-tubes depending on the number of nitrogen gas injection. We investigated further the applicability of the RELAP5 code with different models for the SG U-tubes to the prediction of the non-uniform flow behavior through sensitivity analyses.
format	article
author	Takeshi TAKEDA Iwao OHTSU
author_facet	Takeshi TAKEDA Iwao OHTSU
author_sort	Takeshi TAKEDA
title	ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
title_short	ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
title_full	ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
title_fullStr	ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
title_full_unstemmed	ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses
title_sort	rosa/lstf test on nitrogen gas behavior during reflux condensation in pwr and relap5 code analyses
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/08f08fcb104b47628d959344af22eb64
work_keys_str_mv	AT takeshitakeda rosalstftestonnitrogengasbehaviorduringrefluxcondensationinpwrandrelap5codeanalyses AT iwaoohtsu rosalstftestonnitrogengasbehaviorduringrefluxcondensationinpwrandrelap5codeanalyses
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ROSA/LSTF test on nitrogen gas behavior during reflux condensation in PWR and RELAP5 code analyses

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