Plant system and required water pool capacity for large scale BWRs with inherently safe technologies

The Fukushima Daiichi Nuclear Power Plant accident and its consequences have led to some rethinking about the safety technologies used in boiling water reactors (BWRs). We have been developing the following various safe technologies: a passive water-cooling system, an infinite-time air-cooling syste...

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Autores principales:	Kazuaki KITOU, Naoyuki ISHIDA, Akinori TAMURA, Ryou ISHIBASHI, Masaki KANADA, Mamoru KAMOSHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	inherently safe technology passive safety air-cooling system hydrogen explosion operation support system bwr Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/8f8c4fc5820f4faab592b9676f854d34
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spelling	oai:doaj.org-article:8f8c4fc5820f4faab592b9676f854d342021-11-26T06:30:10ZPlant system and required water pool capacity for large scale BWRs with inherently safe technologies2187-974510.1299/mej.15-00073https://doaj.org/article/8f8c4fc5820f4faab592b9676f854d342015-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/5/2_15-00073/_pdf/-char/enhttps://doaj.org/toc/2187-9745The Fukushima Daiichi Nuclear Power Plant accident and its consequences have led to some rethinking about the safety technologies used in boiling water reactors (BWRs). We have been developing the following various safe technologies: a passive water-cooling system, an infinite-time air-cooling system, a hydrogen explosion prevention system, and an operation support system to better deal with reactor accidents. These technologies are referred to as “inherently safe technologies”. The passive water-cooling system and infinite-time air-cooling system achieve core cooling without electricity. These systems are intended to cope with a long-term station blackout (SBO), such as that which occurred at the Fukushima facility. Both these cooling systems remove relatively high decay heat for the initial 10 days after an accident, and then the infinite-time air-cooling system is used alone to remove attenuated decay heat. The hydrogen explosion prevention system consists of a high-temperature resistant fuel cladding made of silicon-carbide (SiC) and a passive autocatalytic recombiner (PAR). The SiC cladding generates less hydrogen gas than the currently used zircaloy fuel cladding when core damage occurs, and the leaked hydrogen gas is recombined by the PAR. When a large-scale natural disaster occurs, fast event diagnosis and recognition of damaged equipment are necessary. Therefore, the operation support system consists of event identification and progress prediction functions to reduce the occurrence of false recognitions and human errors. This paper describes the following items: the targeted plant system; evaluation results on the required water pool capacity for 10-day water-cooling; development items for the water- and the air-cooling systems, the hydrogen explosion prevention system and the operation support system.Kazuaki KITOUNaoyuki ISHIDAAkinori TAMURARyou ISHIBASHIMasaki KANADAMamoru KAMOSHIDAThe Japan Society of Mechanical Engineersarticleinherently safe technologypassive safetyair-cooling systemhydrogen explosionoperation support systembwrMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 5, Pp 15-00073-15-00073 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	inherently safe technology passive safety air-cooling system hydrogen explosion operation support system bwr Mechanical engineering and machinery TJ1-1570
spellingShingle	inherently safe technology passive safety air-cooling system hydrogen explosion operation support system bwr Mechanical engineering and machinery TJ1-1570 Kazuaki KITOU Naoyuki ISHIDA Akinori TAMURA Ryou ISHIBASHI Masaki KANADA Mamoru KAMOSHIDA Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
description	The Fukushima Daiichi Nuclear Power Plant accident and its consequences have led to some rethinking about the safety technologies used in boiling water reactors (BWRs). We have been developing the following various safe technologies: a passive water-cooling system, an infinite-time air-cooling system, a hydrogen explosion prevention system, and an operation support system to better deal with reactor accidents. These technologies are referred to as “inherently safe technologies”. The passive water-cooling system and infinite-time air-cooling system achieve core cooling without electricity. These systems are intended to cope with a long-term station blackout (SBO), such as that which occurred at the Fukushima facility. Both these cooling systems remove relatively high decay heat for the initial 10 days after an accident, and then the infinite-time air-cooling system is used alone to remove attenuated decay heat. The hydrogen explosion prevention system consists of a high-temperature resistant fuel cladding made of silicon-carbide (SiC) and a passive autocatalytic recombiner (PAR). The SiC cladding generates less hydrogen gas than the currently used zircaloy fuel cladding when core damage occurs, and the leaked hydrogen gas is recombined by the PAR. When a large-scale natural disaster occurs, fast event diagnosis and recognition of damaged equipment are necessary. Therefore, the operation support system consists of event identification and progress prediction functions to reduce the occurrence of false recognitions and human errors. This paper describes the following items: the targeted plant system; evaluation results on the required water pool capacity for 10-day water-cooling; development items for the water- and the air-cooling systems, the hydrogen explosion prevention system and the operation support system.
format	article
author	Kazuaki KITOU Naoyuki ISHIDA Akinori TAMURA Ryou ISHIBASHI Masaki KANADA Mamoru KAMOSHIDA
author_facet	Kazuaki KITOU Naoyuki ISHIDA Akinori TAMURA Ryou ISHIBASHI Masaki KANADA Mamoru KAMOSHIDA
author_sort	Kazuaki KITOU
title	Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
title_short	Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
title_full	Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
title_fullStr	Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
title_full_unstemmed	Plant system and required water pool capacity for large scale BWRs with inherently safe technologies
title_sort	plant system and required water pool capacity for large scale bwrs with inherently safe technologies
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/8f8c4fc5820f4faab592b9676f854d34
work_keys_str_mv	AT kazuakikitou plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies AT naoyukiishida plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies AT akinoritamura plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies AT ryouishibashi plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies AT masakikanada plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies AT mamorukamoshida plantsystemandrequiredwaterpoolcapacityforlargescalebwrswithinherentlysafetechnologies
_version_	1718409792778665984

Plant system and required water pool capacity for large scale BWRs with inherently safe technologies

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