Measurement of secondary emissions during laser cutting of steel equipments

Pilot, G.; Fauvel, S.; Gosse, Xavier; Dinechin, G. de; Vernhet, Didier

doi:10.1016/j.nucengdes.2007.10.028

Cited by 27 publications

(4 citation statements)

References 1 publication

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“…Only a specific fraction of particulate matter (PM) penetrates in the human body by the respiratory tracts. In particular, the particle size having 50% of penetration for the respirable fraction is 4 µm aerodynamic diameter, corresponding to the penetration in the deepest region of the human lung [7] and it is an aerosol particle size typically expected for cutting techniques [8]. Concerning the chemical composition associated to the respirable fraction of aerosols (or other conventional fractions as the inhalable or thoracic fractions [7]) in such dismantling context, very rare works dealt with the characterization of both chemical composition and particle size distribution when radiating material (or simulant) is cut.…”

Section: Introductionmentioning

confidence: 99%

Characterization of chemical composition and particle size distribution of aerosols released during laser cutting of fuel debris simulants

Dazon

Porcheron

Journeau

et al. 2020

Journal of Environmental Chemical Engineering

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Section: Introductionmentioning

confidence: 99%

Characterization of chemical composition and particle size distribution of aerosols released during laser cutting of fuel debris simulants

Dazon

Porcheron

Journeau

et al. 2020

Journal of Environmental Chemical Engineering

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“…As above-mentioned, laser cutting results in a relatively small amount of removed mass and aerosol emission from the cutting material [2]. Besides, the samples tested in this study were relatively small in size.…”

Section: Cuttings and Particle Analysismentioning

confidence: 84%

“…Comparing to the mechanical cutting or other cutting techniques (e.g. plasma torch, arc air, arc saw), laser cutting technique causes the lowest removed mass and the lowest aerosol emission from the cutting material [2]. Fuel debris simulants have been developed based on the theoretical compositions of fuel debris [3,4], and laser cuttings have been tested on different types of simulants.…”

Section: Introductionmentioning

confidence: 99%

Microparticles with diverse sizes and morphologies from mechanical and laser cutting of fuel debris simulants and geopolymer as a covering material

Zhou

Saito

Suzuki

et al. 2021

Journal of Nuclear Science and Technology

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During the decommissioning of Fukushima Daiichi nuclear power plant, the dismantling of massive fuel debris is important for the defueling process. The production and dispersion of radioactive microparticles highly depends on the cutting technique implemented. Previous studies have been conducted on the development of cutting techniques and the treatment of radioactive particles generation during the cutting process. Besides, adequate understanding of the microparticle products during the cuttings of fuel debris is of vital necessity. Nowadays, geopolymer application is proposed as a covering material during the fuel debris retrieval in order to keep the structural integrity of damaged components. In this study, the microparticle products during mechanical and laser cutting of fuel debris simulants (Hafnium oxide and Tungsten(IV) oxide pellets) and geopolymer material were investigated. The cuttings have been carried out for samples of the simulants, geopolymer, and simulants with geopolymer covering. The generated particles were collected and investigated by laser diffraction particle size analyzer and Scanning Electron Microscope with X-ray spectrometry. Particles with diverse sizes and morphologies were observed from the products of each sample. It also appears that particles with unique sizes and morphologies can generate from the laser cuttings due to the thermal effect of laser cutting.

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“…At the same time, owing to the high energy density imparted to a laser irradiated material, fine particles, droplets and fragments from a laser interaction region are generated and dispersed away from the interaction region. This is an issue from the point of view of maintaining safe condition for workers especially for the decommissioning of atomic nuclear facilities [6][7][8] as well as clean material surfaces and safe working conditions in the industrial applications [9][10][11][12]. The laser techniques are expected to be one of the candidates in the debris retrieval technologies at the Fukushima Daiichi Nuclear Power Station [6].…”

Section: Introductionmentioning

confidence: 99%

Observation and characterization of quasi-continuous wave kW-class laser interaction with metal and metal oxide targets using a high-speed camera and microscopes

Daido

Yamada²,

Saruta³

et al. 2023

Phys. Scr.

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Characterization of kW class quasi-continuous wave (a pulse duration of 10 ms) laser interaction with metal targets and those with metal oxide targets are presented in respect to the laser induced breakdown and the successive laser induced melting and evaporation coupled with a mechanical response followed by ejection of various kinds of particles and fragments. An experiment was performed using 0.3-5 kW fiber lasers coupled with a high-speed camera to observe dynamics of the interaction. Ejected fine particles with <1 μm diameters and particles with > a few μm diameters were collected using a cascade impactor and a home-made collector, respectively and these were observed with electron microscopes. Shapes of irradiation marks were observed with a digital optical microscope. We also measured total ejected mass from a target. The experimental results reveal that firstly the laser threshold intensity of the interaction with the meal target was lower and more stable than those with the metal oxide targets. Secondly, in the stainless steel targets, the dynamics of molten layer created by thermal conduction from the laser heated thin layer and successive particle ejection with less mechanical response by the adjacent solid layer are dominant processes, while in the metal oxide targets, the fracturing in the relatively deeper interaction region coupled with brittle material response having relatively large laser shot to shot fluctuation appears to play a significant role in addition to the laser induced melting.

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Measurement of secondary emissions during laser cutting of steel equipments

Cited by 27 publications

References 1 publication

Characterization of chemical composition and particle size distribution of aerosols released during laser cutting of fuel debris simulants

Characterization of chemical composition and particle size distribution of aerosols released during laser cutting of fuel debris simulants

Microparticles with diverse sizes and morphologies from mechanical and laser cutting of fuel debris simulants and geopolymer as a covering material

Observation and characterization of quasi-continuous wave kW-class laser interaction with metal and metal oxide targets using a high-speed camera and microscopes

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