A5008682103- Nuclear Materials and Properties
- Nuclear and radioactivity studies
- Particle Dynamics in Fluid Flows
- Combustion and Detonation Processes
- Radioactive contamination and transfer
- Nuclear Engineering Thermal-Hydraulics
- Graphite, nuclear technology, radiation studies
- Atmospheric aerosols and clouds
- Risk and Safety Analysis
- Cyclone Separators and Fluid Dynamics
- Nuclear reactor physics and engineering
- Aerosol Filtration and Electrostatic Precipitation
- Radioactive element chemistry and processing
- Fluid Dynamics and Heat Transfer
- Atmospheric chemistry and aerosols
- Digital Holography and Microscopy
- Aeolian processes and effects
- Icing and De-icing Technologies
- Fusion materials and technologies
- Precipitation Measurement and Analysis
- Laser-induced spectroscopy and plasma
- Arctic and Antarctic ice dynamics
- Optical measurement and interference techniques
- Cryospheric studies and observations
- Meteorological Phenomena and Simulations
Institut de Radioprotection et de Sûreté Nucléaire
2014-2023
National Institute for Radiological Protection
2023
CEA Paris-Saclay
2015-2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2016
Institut de Recherche sur la Fusion par Confinement Magnétique
2014
Université de Tours
2007
École Nationale Supérieure de Mécanique et d'Aérotechnique
1997-2002
Centre National de la Recherche Scientifique
1997-2002
Université de Poitiers
1997-2002
Our objective was to develop an airborne optical sizemeter for atmospheric water droplet characterization. We chose the ILIDS (interferometric laser imaging sizing) method. This paper details acquisition method developed implement image processing and experimental tests performed validate The purpose is a strategy real-time data analysis in order obtain information on droplets size during flight; this work included EUFAR project that supported by 7th Framework Program of European Commission (FP7).
Cutting fuel debris (solidified corium) is an important issue for the decommissioning of Fukushima Daiichi Power Station. The main reasons developing and using suel simulants are presented. relative merits various types materials (stainless steel, zircalloy, sintered ceramic, cast-fused zirconia, metal + melted inactive simulants, prototypic debris, irradiated simulant) that can be used to test cutting have been assessed against criteria relevant technique itself also (radioactive) aerosol...
Abstract. In the case of severe accident with loss containment in a nuclear plant, radionuclides are released into atmosphere form both gases and aerosol particles (Baklanov Sørensen, 2001). The analysis radioactive scavenged by rain after Chernobyl highlights certain differences between modelling studies environmental measurements. Part these discrepancies can probably be attributed to uncertainties efficiencies used calculate particle collection raindrops, particularly drops diameter...
It is shown that the size and relative positions of two irregular rough particles can be analyzed using interferometric out-of-focus imaging despite overlapping their images. Simulations are confirmed by experiments done with ice generated in a freezing column.
The production and dispersion of contaminated aerosols during the laser cutting corium can potentially provide useful insights into contamination evacuation damaged reactors decommissioning. Quantitative assessments are fundamental to development a safety case for decommissioning Fukushima Daiichi plant. This collaborative work between IRSN, ONET Technologies CEA, managed by Mitsubishi Research Institute on behalf Japanese Ministry Economy, Trade Industry, presents characterization generated...
The objective of this article is to present the development and validation in flight an airborne probe that can measure clouds size droplets whose diameters are range [20 μm; 200 μm].
This work deals with the effect of injected gas density on characteristics liquid core observed at exit injection element used for cryogenic propulsion. The study was conducted atmospheric pressure both in water/air and oxygen/inert gas. techniques are visualization, optical fiber probe, a phase Doppler system. In keeping our predictions, we show that constant momentum flux ratio J between liquid, higher jet is, more is capable atomizing efficiently. A correlation presence probability (LPP)...
We present a system to characterize triphasic flow in 3D volume (air bubbles and solid irregular particles water) using only one CCD sensor. A cylindrical interferometric out-of-focus imaging setup is used determine simultaneously the position size of sand flow. The deduced from ellipticity their image. analysis interference fringes. characteristics are obtained speckle-like pattern. Experiments confirmed by simulations.
In order to study the heat and mass transfers between a spray of droplets atmosphere in thermal-hydraulics conditions representative severe accident Pressurized Water Nuclear Reactor, French Institute for Radioprotection Safety (IRSN) developed TOSQAN facility. The present paper presents development quantification an optical diagnostic, global rainbow refractometry, measure falling droplet temperature.
Abstract. This article presents new measurements of the efficiency with which aerosol particles accumulation mode size are collected by a 1.25 mm sized raindrop. These laboratory provide link to reconcile scavenging coefficients obtained from theoretical approaches those experimental studies. We here proof rear capture mechanism in flow around drops, has fundamental effect on submicroscopic particles. experiments thus confirm efficiencies theoretically simulated Beard (1974). Finally, we...
The general context of the article is related to development laser cutting technique for fuel debris retrieval on damaged reactors Fukushima Dai-ichi. IRSN and CEA are involved in a project, led by ONET, bring relevant elements analyze risk occurred dispersion aerosols emitted dismantling operations. Results regarding source term characterization during non-radioactive simulants were acquired experiments undertaken DELIA platform from CEA. realized aerosol sampling, size distribution...
TOSQAN is an experimental program undertaken by the Institut de Radioprotection et Surété Nucleaire (IRSN) in order to perform thermal hydraulic containment studies. The facility a large enclosure devoted simulating typical accidental flow conditions nuclear Pressurized Water Reactor (PWR) containment. facility, which highly instrumented with non-intrusive optical diagnostics, particularly adapted safety CFD code validation. present work studying interaction of water spray injection used as...