Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents

In order to address the challenge of the future Fukushima Dai-Ichi Nuclear Power Station (1F) debris characterization a new Raman spectroscopy investigation of simulated debris obtained after two control blade degradation tests CLADS-MADE-01 and CLADS-MADE-02 has been performed. A mechanism of the B...

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Autores principales:	Anton PSHENICHNIKOV, Yuji NAGAE, Masaki KURATA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	bwr severe accident fukushima dai-ichi decommissioning control blade degradation b4c raman spectroscopy Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/22b00c51730f440e99f2e06c2476838e
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spelling	oai:doaj.org-article:22b00c51730f440e99f2e06c2476838e2021-11-29T05:53:24ZRaman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents2187-974510.1299/mej.19-00477https://doaj.org/article/22b00c51730f440e99f2e06c2476838e2020-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/2/7_19-00477/_pdf/-char/enhttps://doaj.org/toc/2187-9745In order to address the challenge of the future Fukushima Dai-Ichi Nuclear Power Station (1F) debris characterization a new Raman spectroscopy investigation of simulated debris obtained after two control blade degradation tests CLADS-MADE-01 and CLADS-MADE-02 has been performed. A mechanism of the B4C degradation during the beginning phase of a severe accident until approximately 1873 K is described. A sequence of material interactions of B4C with stainless steel resulted in partial transformation of B4C granules into pure graphite, that later experienced oxidation with formation of COx gas. Especially this mechanism is active during melting phase in oxidative environment. At the same time boron was associated with formation of new Cr-B-containing solid phases in liquid melt, that continued relocation depleted by Cr and B, which resulted in redistribution of elements within the degrading reactor core. This knowledge would provide new insights for understanding of the absorber blade degradation mechanism under specific accident conditions close to Fukushima Daiichi Unit 2 and Unit 3 reactors and especially would be helpful during potential characterization of metallic debris of 1F.Anton PSHENICHNIKOVYuji NAGAEMasaki KURATAThe Japan Society of Mechanical Engineersarticlebwrsevere accidentfukushima dai-ichi decommissioningcontrol blade degradationb4craman spectroscopyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 2, Pp 19-00477-19-00477 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	bwr severe accident fukushima dai-ichi decommissioning control blade degradation b4c raman spectroscopy Mechanical engineering and machinery TJ1-1570
spellingShingle	bwr severe accident fukushima dai-ichi decommissioning control blade degradation b4c raman spectroscopy Mechanical engineering and machinery TJ1-1570 Anton PSHENICHNIKOV Yuji NAGAE Masaki KURATA Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
description	In order to address the challenge of the future Fukushima Dai-Ichi Nuclear Power Station (1F) debris characterization a new Raman spectroscopy investigation of simulated debris obtained after two control blade degradation tests CLADS-MADE-01 and CLADS-MADE-02 has been performed. A mechanism of the B4C degradation during the beginning phase of a severe accident until approximately 1873 K is described. A sequence of material interactions of B4C with stainless steel resulted in partial transformation of B4C granules into pure graphite, that later experienced oxidation with formation of COx gas. Especially this mechanism is active during melting phase in oxidative environment. At the same time boron was associated with formation of new Cr-B-containing solid phases in liquid melt, that continued relocation depleted by Cr and B, which resulted in redistribution of elements within the degrading reactor core. This knowledge would provide new insights for understanding of the absorber blade degradation mechanism under specific accident conditions close to Fukushima Daiichi Unit 2 and Unit 3 reactors and especially would be helpful during potential characterization of metallic debris of 1F.
format	article
author	Anton PSHENICHNIKOV Yuji NAGAE Masaki KURATA
author_facet	Anton PSHENICHNIKOV Yuji NAGAE Masaki KURATA
author_sort	Anton PSHENICHNIKOV
title	Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
title_short	Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
title_full	Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
title_fullStr	Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
title_full_unstemmed	Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
title_sort	raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/22b00c51730f440e99f2e06c2476838e
work_keys_str_mv	AT antonpshenichnikov ramancharacterizationofthesimulatedcontrolbladedebristounderstandtheboriccompoundstransformationsduringsevereaccidents AT yujinagae ramancharacterizationofthesimulatedcontrolbladedebristounderstandtheboriccompoundstransformationsduringsevereaccidents AT masakikurata ramancharacterizationofthesimulatedcontrolbladedebristounderstandtheboriccompoundstransformationsduringsevereaccidents
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Raman characterization of the simulated control blade debris to understand the boric compounds transformations during severe accidents

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