Interaction between B4C, 304 stainless steel, and Zircaloy-4 in H2O/H2 atmosphere at 1473 K

Xu Gao; Ryosuke Sasaki; Lichun Zheng; Shigeru Ueda; Sun joong Kim; Shin ya Kitamura; Yoshinao Kobayashi

doi:10.1080/00223131.2017.1403388

Interaction between B₄C, 304 stainless steel, and Zircaloy-4 in H₂O/H₂ atmosphere at 1473 K

Xu Gao, Ryosuke Sasaki, Lichun Zheng, Shigeru Ueda, Sun joong Kim, Shin ya Kitamura, Yoshinao Kobayashi

IMRAM - Center for Mineral Processing and Metallurgy (CMPM)

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The control blade and the fuel rod installed in channel box melt in steam during severe accident of a boiling water reactor. In order to clarify the melting phenomena and relocation of the structural material in the core of the reactor, interaction and melting behavior among B₄C, 304 grade of stainless steel (SST), and Zircaloy-4 in atmosphere containing H₂/H₂O at 1473 K are investigated. The results showed that the reaction at the interface between B₄C and SST under H₂O atmosphere was slow and an oxidation was observed after 3600 s. Under H₂O/H₂ atmosphere, the concentration of B and C in the SST increased and the SST melted. Despite the atmosphere, an oxide layer formed on the surface of Zircaloy-4, and thus the reactions proceeded slowly when the Zircaloy-4 was contacted with B₄C and SST. Under H₂O atmosphere, continuous oxidation happened to SST, and SST was partially melted. Under H₂ atmosphere, the SST was also melted due to the diffusion of B and C from the B₄C. In addition, the oxidation of B₄C affected the oxidation behavior of SST and Zircaloy, and thus the oxidation and the hydroxylation of B₄C in a severe accident was discussed thermodynamically.

Original language	English
Pages (from-to)	400-409
Number of pages	10
Journal	Journal of Nuclear Science and Technology
Volume	55
Issue number	4
DOIs	https://doi.org/10.1080/00223131.2017.1403388
Publication status	Published - 2018 Apr 3

Keywords

BC
melting
oxidation
stainless steel
steam
Zircaloy

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10.1080/00223131.2017.1403388

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@article{74920fc3ea974101bdf7a6fc8cbc5273,

title = "Interaction between B4C, 304 stainless steel, and Zircaloy-4 in H2O/H2 atmosphere at 1473 K",

abstract = "The control blade and the fuel rod installed in channel box melt in steam during severe accident of a boiling water reactor. In order to clarify the melting phenomena and relocation of the structural material in the core of the reactor, interaction and melting behavior among B4C, 304 grade of stainless steel (SST), and Zircaloy-4 in atmosphere containing H2/H2O at 1473 K are investigated. The results showed that the reaction at the interface between B4C and SST under H2O atmosphere was slow and an oxidation was observed after 3600 s. Under H2O/H2 atmosphere, the concentration of B and C in the SST increased and the SST melted. Despite the atmosphere, an oxide layer formed on the surface of Zircaloy-4, and thus the reactions proceeded slowly when the Zircaloy-4 was contacted with B4C and SST. Under H2O atmosphere, continuous oxidation happened to SST, and SST was partially melted. Under H2 atmosphere, the SST was also melted due to the diffusion of B and C from the B4C. In addition, the oxidation of B4C affected the oxidation behavior of SST and Zircaloy, and thus the oxidation and the hydroxylation of B4C in a severe accident was discussed thermodynamically.",

keywords = "BC, melting, oxidation, stainless steel, steam, Zircaloy",

author = "Xu Gao and Ryosuke Sasaki and Lichun Zheng and Shigeru Ueda and Kim, {Sun joong} and Kitamura, {Shin ya} and Yoshinao Kobayashi",

note = "Funding Information: This study is f inancially supported by the project of {"}Accessibility for removal of fuel debris in BWR plant after severe accident{"}, Japan Science and Technology Agency. Publisher Copyright: {\textcopyright} 2017 Atomic Energy Society of Japan. All rights reserved.",

year = "2018",

month = apr,

day = "3",

doi = "10.1080/00223131.2017.1403388",

language = "English",

volume = "55",

pages = "400--409",

journal = "Journal of Nuclear Science and Technology",

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TY - JOUR

T1 - Interaction between B4C, 304 stainless steel, and Zircaloy-4 in H2O/H2 atmosphere at 1473 K

AU - Gao, Xu

AU - Sasaki, Ryosuke

AU - Zheng, Lichun

AU - Ueda, Shigeru

AU - Kim, Sun joong

AU - Kitamura, Shin ya

AU - Kobayashi, Yoshinao

N1 - Funding Information: This study is f inancially supported by the project of "Accessibility for removal of fuel debris in BWR plant after severe accident", Japan Science and Technology Agency. Publisher Copyright: © 2017 Atomic Energy Society of Japan. All rights reserved.

PY - 2018/4/3

Y1 - 2018/4/3

N2 - The control blade and the fuel rod installed in channel box melt in steam during severe accident of a boiling water reactor. In order to clarify the melting phenomena and relocation of the structural material in the core of the reactor, interaction and melting behavior among B4C, 304 grade of stainless steel (SST), and Zircaloy-4 in atmosphere containing H2/H2O at 1473 K are investigated. The results showed that the reaction at the interface between B4C and SST under H2O atmosphere was slow and an oxidation was observed after 3600 s. Under H2O/H2 atmosphere, the concentration of B and C in the SST increased and the SST melted. Despite the atmosphere, an oxide layer formed on the surface of Zircaloy-4, and thus the reactions proceeded slowly when the Zircaloy-4 was contacted with B4C and SST. Under H2O atmosphere, continuous oxidation happened to SST, and SST was partially melted. Under H2 atmosphere, the SST was also melted due to the diffusion of B and C from the B4C. In addition, the oxidation of B4C affected the oxidation behavior of SST and Zircaloy, and thus the oxidation and the hydroxylation of B4C in a severe accident was discussed thermodynamically.

AB - The control blade and the fuel rod installed in channel box melt in steam during severe accident of a boiling water reactor. In order to clarify the melting phenomena and relocation of the structural material in the core of the reactor, interaction and melting behavior among B4C, 304 grade of stainless steel (SST), and Zircaloy-4 in atmosphere containing H2/H2O at 1473 K are investigated. The results showed that the reaction at the interface between B4C and SST under H2O atmosphere was slow and an oxidation was observed after 3600 s. Under H2O/H2 atmosphere, the concentration of B and C in the SST increased and the SST melted. Despite the atmosphere, an oxide layer formed on the surface of Zircaloy-4, and thus the reactions proceeded slowly when the Zircaloy-4 was contacted with B4C and SST. Under H2O atmosphere, continuous oxidation happened to SST, and SST was partially melted. Under H2 atmosphere, the SST was also melted due to the diffusion of B and C from the B4C. In addition, the oxidation of B4C affected the oxidation behavior of SST and Zircaloy, and thus the oxidation and the hydroxylation of B4C in a severe accident was discussed thermodynamically.

KW - BC

KW - melting

KW - oxidation

KW - stainless steel

KW - steam

KW - Zircaloy

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SN - 0022-3131

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JF - Journal of Nuclear Science and Technology

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ER -

Interaction between B₄C, 304 stainless steel, and Zircaloy-4 in H₂O/H₂ atmosphere at 1473 K

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Keywords

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