Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant

A new method has been developed to assess potential challenges by forest fire smoke on a cooling function of a decay heat removal system (DHRS) of a sodium-cooled fast reactor. Combinational numerical simulations of a forest fire propagation and a smoke transport were performed to evaluate a cumulat...

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Autores principales:	Yasushi OKANO, Hidemasa YAMANO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	forest fire external hazard smoke particle matter air filter decay heat removal system sodium cooled fast reactor farsite aloft-ft Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/e62361b0d39647459b893db7a813b376
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spelling	oai:doaj.org-article:e62361b0d39647459b893db7a813b3762021-11-26T06:51:30ZNumerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant2187-974510.1299/mej.15-00592https://doaj.org/article/e62361b0d39647459b893db7a813b3762016-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/3/3_15-00592/_pdf/-char/enhttps://doaj.org/toc/2187-9745A new method has been developed to assess potential challenges by forest fire smoke on a cooling function of a decay heat removal system (DHRS) of a sodium-cooled fast reactor. Combinational numerical simulations of a forest fire propagation and a smoke transport were performed to evaluate a cumulative amount of smoke captured on air filters of the DHRS. The forest fire propagation simulations were performed using FARSITE code to evaluate a temporal increase of a forest fire spread area, a frontal fireline location, reaction intensity, and fireline intensity. Peripheral boundary of the forest fire spread area is shaped like an ellipse on the terrain, and the active forest fire area from which smoke is produced as a forest fire product is increased with forest fire spread. The smoke transport simulations were performed using ALOFT-FT code where a spatial distribution of smoke density, especially of particle matter (PM), is evaluated. The snapshot (i.e. at a certain time step) outputs by FARSITE on the reaction intensity and the fireline intensity were utilized as the input data for ALOFT-FT, while it was conservatively assumed that the smoke generated from the active forest fire area along the periphery boundary rises up from the frontal fireline location nearest to a nuclear power plant (NPP) and that prevailing wind transports all smoke to an NPP in the leeward side. The evaluated time-dependent changes of spatial PM density were utilized to calculate a cumulative amount of PM captured on the air filters of the DHRS. Sensitivity analysis was performed on prevailing wind speed to which both the fireline intensity and the smoke transport behavior are sensitive. The total amount of PM on the air filters was conservatively estimated around several hundred grams per m2 which is well below the utilization limit.Yasushi OKANOHidemasa YAMANOThe Japan Society of Mechanical Engineersarticleforest fireexternal hazardsmokeparticle matterair filterdecay heat removal systemsodium cooled fast reactorfarsitealoft-ftMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 3, Pp 15-00592-15-00592 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	forest fire external hazard smoke particle matter air filter decay heat removal system sodium cooled fast reactor farsite aloft-ft Mechanical engineering and machinery TJ1-1570
spellingShingle	forest fire external hazard smoke particle matter air filter decay heat removal system sodium cooled fast reactor farsite aloft-ft Mechanical engineering and machinery TJ1-1570 Yasushi OKANO Hidemasa YAMANO Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
description	A new method has been developed to assess potential challenges by forest fire smoke on a cooling function of a decay heat removal system (DHRS) of a sodium-cooled fast reactor. Combinational numerical simulations of a forest fire propagation and a smoke transport were performed to evaluate a cumulative amount of smoke captured on air filters of the DHRS. The forest fire propagation simulations were performed using FARSITE code to evaluate a temporal increase of a forest fire spread area, a frontal fireline location, reaction intensity, and fireline intensity. Peripheral boundary of the forest fire spread area is shaped like an ellipse on the terrain, and the active forest fire area from which smoke is produced as a forest fire product is increased with forest fire spread. The smoke transport simulations were performed using ALOFT-FT code where a spatial distribution of smoke density, especially of particle matter (PM), is evaluated. The snapshot (i.e. at a certain time step) outputs by FARSITE on the reaction intensity and the fireline intensity were utilized as the input data for ALOFT-FT, while it was conservatively assumed that the smoke generated from the active forest fire area along the periphery boundary rises up from the frontal fireline location nearest to a nuclear power plant (NPP) and that prevailing wind transports all smoke to an NPP in the leeward side. The evaluated time-dependent changes of spatial PM density were utilized to calculate a cumulative amount of PM captured on the air filters of the DHRS. Sensitivity analysis was performed on prevailing wind speed to which both the fireline intensity and the smoke transport behavior are sensitive. The total amount of PM on the air filters was conservatively estimated around several hundred grams per m2 which is well below the utilization limit.
format	article
author	Yasushi OKANO Hidemasa YAMANO
author_facet	Yasushi OKANO Hidemasa YAMANO
author_sort	Yasushi OKANO
title	Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
title_short	Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
title_full	Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
title_fullStr	Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
title_full_unstemmed	Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
title_sort	numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/e62361b0d39647459b893db7a813b376
work_keys_str_mv	AT yasushiokano numericalsimulationsofforestfirepropagationandsmoketransportasanexternalhazardassessmentmethodologydevelopmentforanuclearpowerplant AT hidemasayamano numericalsimulationsofforestfirepropagationandsmoketransportasanexternalhazardassessmentmethodologydevelopmentforanuclearpowerplant
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Numerical simulations of forest fire propagation and smoke transport as an external hazard assessment methodology development for a nuclear power plant

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