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Journal Articles

Raman spectroscopy of eutectic melting between boride granule and stainless steel for sodium-cooled fast reactors

Fukai, Hirofumi*; Furuya, Masahiro*; Yamano, Hidemasa

Nuclear Engineering and Technology, 55(3), p.902 - 907, 2023/03

https://doi.org/10.1016/j.net.2022.11.010

Times Cited Count：4 Percentile：83.63(Nuclear Science & Technology)

This paper addresses reaction products and their distribution of the eutectic melting/solidifying reaction of boron carbide (B $_{4}$ C) and stainless-steel (SS). The influence of the existence of carbon on the B $_{4}$ C-SS eutectic reaction was investigated by comparing the iron boride (FeB)-SS reaction by Raman spectroscopy with Multivariate Curve Resolution (MCR) analysis. The scanning electron microscopy with dispersive X-ray spectrometer was also used to investigate the elemental information of the pure metals such as Cr, Ni, and Fe. In the B $_{4}$ C-SS samples, a new layer was formed between B $_{4}$ C/SS interface, and the layer was confirmed that the formed layer corresponded to amorphous carbon (graphite) or FeB or Fe $_{2}$ B. In contrast, a new layer was not clearly formed between FeB and SS interface in the FeB-SS samples.

Journal Articles

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 1; Project overview and progress until 2020

Yamano, Hidemasa; Takai, Toshihide; Emura, Yuki; Fukuyama, Hiroyuki*; Higashi, Hideo*; Nishi, Tsuyoshi*; Ota, Hiromichi*; Morita, Koji*; Nakamura, Kinya*; Fukai, Hirofumi*; et al.

Proceedings of 13th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation and Safety (NUTHOS-13) (Internet), 12 Pages, 2022/09

This paper describes the project overview and progress of experimental and analytical studies conducted until 2020. Specific results in this paper are the measurement of the eutectic reaction rates and the validation of physical model describing the eutectic reaction in the analysis code through the numerical analysis of the B $_{4}$ C-SS eutectic reaction rate experiments in which a B $_{4}$ C pellet was placed in a SS crucible.

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with Multi-Physics modeling, 2; Points of discussion on debris conditions in Units 2 and 3

Sato, Ikken; Yamaji, Akifumi*; Furuya, Masahiro*; Oishi, Yuji*; Li, X.; Madokoro, Hiroshi; Fukai, Hirofumi*

no journal, ,

no abstracts in English

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 4; Consideration on possible RPV-boundary failure modes of Unit 2

Sato, Ikken; Yamaji, Akifumi*; Furuya, Masahiro*; Oishi, Yuji*; Li, X.*; Madokoro, Hiroshi; Fukai, Hirofumi*

no journal, ,

no abstracts in English

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 3; Overview of the project and progress of the first year

Yamaji, Akifumi*; Furuya, Masahiro*; Oishi, Yuji*; Sato, Ikken; Li, X.*; Fukai, Hirofumi*; Madokoro, Hiroshi

no journal, ,

no abstracts in English

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 5; Numerical analysis of simulant molten debris spreading and ablation on BWR pedestal experiments with MPS method

Li, X.*; Yamaji, Akifumi*; Duan, G.*; Furuya, Masahiro*; Fukai, Hirofumi*; Sato, Ikken; Madokoro, Hiroshi; Oishi, Yuji*

no journal, ,

Oral presentation

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 25; Project overview and progress until 2020

Yamano, Hidemasa; Takai, Toshihide; Emura, Yuki; Higashi, Hideo*; Fukuyama, Hiroyuki*; Nishi, Tsuyoshi*; Ota, Hiromichi*; Morita, Koji*; Nakamura, Kinya*; Fukai, Hirofumi*; et al.

no journal, ,

A research project has been conducting thermophysical property measurement of a eutectic melt, eutectic melting experiments and material analysis, physical model development for the eutectic melting reaction, and reactor application analysis in order to simulate the eutectic melting reaction and relocation behavior of boron carbide as a control rod material and stainless steel during a core disruptive accident in an advanced sodium-cooled fast reactor designed in Japan. This paper describes the project overview and progress until JFY2020.

Oral presentation

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 9; Fukushima-Daiichi Unit-3 plant data analysis focusing on estimated fuel debris relocation to the pedestal

Sato, Ikken; Yamaji, Akifumi*; Furuya, Masahiro*; Oishi, Yuji*; Li, X.*; Madokoro, Hiroshi; Fukai, Hirofumi*

no journal, ,

no abstracts in English

Oral presentation

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 29; Project overview and progress until 2021

Takai, Toshihide; Yamano, Hidemasa; Emura, Yuki; Higashi, Hideo*; Fukuyama, Hiroyuki*; Morita, Koji*; Nakamura, Kinya*; Fukai, Hirofumi*; Furuya, Masahiro*; Hong, Z.*; et al.

no journal, ,

A research project has been conducting thermophysical property measurement of a eutectic melt, eutectic melting reaction and relocation experiments, eutectic reaction mechanism investigation, and physical model development on the eutectic melting reaction for reactor application analysis in order to simulate the eutectic melting reaction and relocation behavior of boron carbide as a control rod material and stainless steel during a core disruptive accident in an advanced sodium-cooled fast reactor designed in Japan. This paper describes the project overview and progress until JFY2021.

Oral presentation

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 28; Three-dimensional Raman spectroscopic analysis of B $_{4}$ C-SS and FeB-SS eutectic melt

Fukai, Hirofumi*; Furuya, Masahiro*; Morita, Hidetoshi*; Yamano, Hidemasa

no journal, ,

Boron carbide (B $_{4}$ C), iron tetraboride (FeB) and stainless steel (SS) were eutectic-melted at 1250 $^{circ}$ C., and the reaction products were identified and their distribution was analyzed by three-dimensional Raman spectroscopy. In each case, it was found that a region containing Cr $_{2}$ O $_{3}$ as a main component was formed around B $_{4}$ C and FeB, and a region containing Fe $_{3}$ O $_{4}$ as a main component was formed on the outer periphery.

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Raman spectroscopy of eutectic melting between boride granule and stainless steel for sodium-cooled fast reactors

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 1; Project overview and progress until 2020

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with Multi-Physics modeling, 2; Points of discussion on debris conditions in Units 2 and 3

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 4; Consideration on possible RPV-boundary failure modes of Unit 2

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 3; Overview of the project and progress of the first year

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 5; Numerical analysis of simulant molten debris spreading and ablation on BWR pedestal experiments with MPS method

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 25; Project overview and progress until 2020

Estimation of the in-depth debris status of Fukushima Unit-2 and Unit-3 with multi-physics modeling, 9; Fukushima-Daiichi Unit-3 plant data analysis focusing on estimated fuel debris relocation to the pedestal

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 29; Project overview and progress until 2021

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 28; Three-dimensional Raman spectroscopic analysis of B $_{4}$ C-SS and FeB-SS eutectic melt