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Radiation Heating Effects on B4C-SS Eutectic Melting and Its Relocation Behaviour.

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Title: Radiation Heating Effects on B4C-SS Eutectic Melting and Its Relocation Behaviour.
Authors: Ahmed, Zeeshan1 (AUTHOR) zeeshan@g.ecc.u-tokyo.ac.jp, Sharma, Avadhesh Kumar1,2 (AUTHOR), Pellegrini, Marco1 (AUTHOR), Yamano, Hidemasa3 (AUTHOR), Okamoto, Koji1 (AUTHOR)
Source: Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ). Mar2025, Vol. 50 Issue 5, p3361-3371. 11p.
Subjects: Control elements (Nuclear reactors), Fast reactors, Eutectic reactions, Stainless steel, Heat radiation & absorption, Boron carbides
Abstract: The advancement of sodium-cooled fast reactors (generation IV) faces a critical challenge related to core disruptive accidents. A primary issue is the boron carbide (B4C) and stainless steel (SS) eutectic reaction, leading to premature melting and molten pool formation with boron, affecting neutron balance. This study pioneers the use of radiative heating for high-resolution visualisation and quantification of the eutectic melt composition, providing a novel approach to observing the melting and candling phenomena. Experimental investigations were conducted with B4C pellets and powder in SS hollow claddings, replicating control rods, from 1150 to 1372 °C. The eutectic temperature for B4C pellets was found to be higher than that for B4C powder and invariant with the heating rate. Key findings include two distinct failure processes: SS cladding detachment forming molten droplets and fragmentation of B4C pellets, with sintering observed in B4C powder. X-ray diffraction analysis identified boride phases B0.9Cr0.9Fe1.1, (Cr,Fe)2B, γ-Fe, (Cr,Fe)23(B,C)6, and (Cr,Fe)5B3, solidified at 48–50 °C in argon. This novel study elucidates the eutectic behaviour and boride phase formation in severe reactor conditions, providing critical insights for reactor safety. [ABSTRACT FROM AUTHOR]
Copyright of Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Radiation Heating Effects on B<subscript>4</subscript>C-SS Eutectic Melting and Its Relocation Behaviour.
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  Data: <searchLink fieldCode="DE" term="%22Control+elements+%28Nuclear+reactors%29%22">Control elements (Nuclear reactors)</searchLink><br /><searchLink fieldCode="DE" term="%22Fast+reactors%22">Fast reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Eutectic+reactions%22">Eutectic reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Stainless+steel%22">Stainless steel</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+radiation+%26+absorption%22">Heat radiation & absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Boron+carbides%22">Boron carbides</searchLink>
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  Data: The advancement of sodium-cooled fast reactors (generation IV) faces a critical challenge related to core disruptive accidents. A primary issue is the boron carbide (B4C) and stainless steel (SS) eutectic reaction, leading to premature melting and molten pool formation with boron, affecting neutron balance. This study pioneers the use of radiative heating for high-resolution visualisation and quantification of the eutectic melt composition, providing a novel approach to observing the melting and candling phenomena. Experimental investigations were conducted with B4C pellets and powder in SS hollow claddings, replicating control rods, from 1150 to 1372 °C. The eutectic temperature for B4C pellets was found to be higher than that for B4C powder and invariant with the heating rate. Key findings include two distinct failure processes: SS cladding detachment forming molten droplets and fragmentation of B4C pellets, with sintering observed in B4C powder. X-ray diffraction analysis identified boride phases B0.9Cr0.9Fe1.1, (Cr,Fe)2B, γ-Fe, (Cr,Fe)23(B,C)6, and (Cr,Fe)5B3, solidified at 48–50 °C in argon. This novel study elucidates the eutectic behaviour and boride phase formation in severe reactor conditions, providing critical insights for reactor safety. [ABSTRACT FROM AUTHOR]
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  Group: Ab
  Data: <i>Copyright of Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s13369-024-09412-9
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        Text: English
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        Type: general
      – SubjectFull: Fast reactors
        Type: general
      – SubjectFull: Eutectic reactions
        Type: general
      – SubjectFull: Stainless steel
        Type: general
      – SubjectFull: Heat radiation & absorption
        Type: general
      – SubjectFull: Boron carbides
        Type: general
    Titles:
      – TitleFull: Radiation Heating Effects on B4C-SS Eutectic Melting and Its Relocation Behaviour.
        Type: main
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            NameFull: Ahmed, Zeeshan
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              M: 03
              Text: Mar2025
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              Y: 2025
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