Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors

This paper describes the development of a probabilistic risk assessment (PRA) methodology against a combination hazard of strong wind and rainfall. In this combination hazard PRA, a hazard curve is evaluated in terms of maximum instantaneous wind speed, hourly rainfall, and rainfall duration. A scen...

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Autores principales:	Hidemasa YAMANO, Hiroyuki NISHINO, Kenichi KURISAKA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	sodium-cooled fast reactor probabilistic risk assessment external hazard wind rainfall combination hazard Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/94f1d9708ac54684830761cf2f2b1eda
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spelling	oai:doaj.org-article:94f1d9708ac54684830761cf2f2b1eda2021-11-26T07:21:52ZDevelopment of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors2187-974510.1299/mej.18-00093https://doaj.org/article/94f1d9708ac54684830761cf2f2b1eda2018-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/4/5_18-00093/_pdf/-char/enhttps://doaj.org/toc/2187-9745This paper describes the development of a probabilistic risk assessment (PRA) methodology against a combination hazard of strong wind and rainfall. In this combination hazard PRA, a hazard curve is evaluated in terms of maximum instantaneous wind speed, hourly rainfall, and rainfall duration. A scenario analysis has provided event sequences resulting from the combination hazard of strong wind and rainfall. The typical event sequence was characterized by the function loss of auxiliary cooling system, of which heat transfer tubes could crack due to cycle fatigue caused by cyclic contacts with rain droplets. This cycle fatigue crack could occur if rain droplets enter into the air cooler of the system following the cooler's roof failure due to strong-wind-generated missile impact. This event sequence has been incorporated into an event tree which addresses component failure caused by the combination hazard. As a result, a core damage frequency has been estimated to be about 10-6/year in total by multiplying discrete hazard frequencies by conditional decay heat removal failure probabilities. The dominant sequence is the manual operation failure of an air cooler damper following the failure of external fuel tank due to the missile impact. The dominant hazard is the maximum instantaneous wind speed of 20−40 m/s, the hourly rainfall of 20−40 mm/h, and the rainfall duration of 0−10 h.Hidemasa YAMANOHiroyuki NISHINOKenichi KURISAKAThe Japan Society of Mechanical Engineersarticlesodium-cooled fast reactorprobabilistic risk assessmentexternal hazardwindrainfallcombination hazardMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 4, Pp 18-00093-18-00093 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	sodium-cooled fast reactor probabilistic risk assessment external hazard wind rainfall combination hazard Mechanical engineering and machinery TJ1-1570
spellingShingle	sodium-cooled fast reactor probabilistic risk assessment external hazard wind rainfall combination hazard Mechanical engineering and machinery TJ1-1570 Hidemasa YAMANO Hiroyuki NISHINO Kenichi KURISAKA Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
description	This paper describes the development of a probabilistic risk assessment (PRA) methodology against a combination hazard of strong wind and rainfall. In this combination hazard PRA, a hazard curve is evaluated in terms of maximum instantaneous wind speed, hourly rainfall, and rainfall duration. A scenario analysis has provided event sequences resulting from the combination hazard of strong wind and rainfall. The typical event sequence was characterized by the function loss of auxiliary cooling system, of which heat transfer tubes could crack due to cycle fatigue caused by cyclic contacts with rain droplets. This cycle fatigue crack could occur if rain droplets enter into the air cooler of the system following the cooler's roof failure due to strong-wind-generated missile impact. This event sequence has been incorporated into an event tree which addresses component failure caused by the combination hazard. As a result, a core damage frequency has been estimated to be about 10-6/year in total by multiplying discrete hazard frequencies by conditional decay heat removal failure probabilities. The dominant sequence is the manual operation failure of an air cooler damper following the failure of external fuel tank due to the missile impact. The dominant hazard is the maximum instantaneous wind speed of 20−40 m/s, the hourly rainfall of 20−40 mm/h, and the rainfall duration of 0−10 h.
format	article
author	Hidemasa YAMANO Hiroyuki NISHINO Kenichi KURISAKA
author_facet	Hidemasa YAMANO Hiroyuki NISHINO Kenichi KURISAKA
author_sort	Hidemasa YAMANO
title	Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
title_short	Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
title_full	Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
title_fullStr	Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
title_full_unstemmed	Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
title_sort	development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/94f1d9708ac54684830761cf2f2b1eda
work_keys_str_mv	AT hidemasayamano developmentofaprobabilisticriskassessmentmethodologyagainstacombinationhazardofstrongwindandrainfallforsodiumcooledfastreactors AT hiroyukinishino developmentofaprobabilisticriskassessmentmethodologyagainstacombinationhazardofstrongwindandrainfallforsodiumcooledfastreactors AT kenichikurisaka developmentofaprobabilisticriskassessmentmethodologyagainstacombinationhazardofstrongwindandrainfallforsodiumcooledfastreactors
_version_	1718409671499317248

Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors

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