A proposed formation mechanism of the Type-A radiocaesium-bearing microparticles released from Units 2/3 during the Fukushima Daiichi Nuclear Power Plant accident

Zheng, Lichun; Yan, Baiqiang; Peng, Bo; Li, Huabing; Jiang, Zhong‐Zhong; Ueda, Shigeru

doi:10.1016/j.jnucmat.2022.153623

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…One proposed origin of CsMPs suggests an interaction between Cs (as Cs 2 O) and up to 1% silicon present in the stainless steel of the internals and the reactor pressure vessel (RPV) at high temperatures. Experimental and thermodynamic evidences support the formation of oxidic phases rich in Fe, Si, and Cs, which could later evolve into type-A CsMPs through remelting 16 .…”

Section: Introductionmentioning

confidence: 93%

Origin and generation mechanism of type-A Cs-bearing microparticles from Fukushima Daiichi

Laffolley,

Journeau,

Grambow

2023

Preprint

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The Fukushima Daiichi accident resulted in the release of a novel form of radioactive Cs contamination into the environment, called Cs-bearing microparticles (CsMP). CsMPs constitute a substantial portion of the radioactive pollution near the nuclear power station and traveled beyond several hundred kilometers. Extensive characterization of the CsMPs revealed an amorphous silica matrix, along with Cs and other minor or trace elements such as Fe and Zn. This study explores the unclear generation mechanism of CsMPs by conducting experimental molten core concrete interactions (MCCI) as a source of Si and analyzing the resultant aerosols. The findings demonstrate that MCCI is in capacity to produce spherical submicronic and micronic particles, primarily composed of amorphous silica and incorporating elements akin to CsMPs. A humid atmosphere is found to favour an even closer chemical composition. Examination of the internal structure of the synthesized particles unveils numerous crystalline nanoinclusions, similar to those observed in CsMPs, possibly serving as nucleation sites for CsMP formation through the condensation of Si-rich vapors.

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Section: Introductionmentioning

confidence: 93%

Origin and generation mechanism of type-A Cs-bearing microparticles from Fukushima Daiichi

Laffolley,

Journeau,

Grambow

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The silica matrix implies that the generation process must include an abundant source of silicon. It could be stainless steel from the reactor pressure vessel (RPV) and from the structural materials [16],…”

Section: Generation Processmentioning

confidence: 99%

Thermodynamics of aerosols during a molten core-concrete interaction at Fukushima Daiichi Unit 2 estimated conditions

Laffolley

Journeau

Thilliez

et al. 2023

Annals of Nuclear Energy

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The formation mechanism of radiocesium-bearing microparticles derived from the Fukushima Daiichi nuclear power plant using electron microscopy

Hagiwara

Kondo²

2022

J Radioanal Nucl Chem

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A proposed formation mechanism of the Type-A radiocaesium-bearing microparticles released from Units 2/3 during the Fukushima Daiichi Nuclear Power Plant accident

Cited by 6 publications

References 41 publications

Origin and generation mechanism of type-A Cs-bearing microparticles from Fukushima Daiichi

Origin and generation mechanism of type-A Cs-bearing microparticles from Fukushima Daiichi

Thermodynamics of aerosols during a molten core-concrete interaction at Fukushima Daiichi Unit 2 estimated conditions

The formation mechanism of radiocesium-bearing microparticles derived from the Fukushima Daiichi nuclear power plant using electron microscopy

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