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591 results on '"Genin J"'

19. Posttreatment Assessment of Soft Tissue Tumors

Author

Vanel, D., Shapeero, L. G., Guinebretière, J. M., Lecesne, A., Genin, J., De Schepper, Arthur M., editor, Parizel, Paul M., editor, Ramon, Frank, editor, De Beuckeleer, Luc, editor, and Vandevenne, Jan E., editor

Published
1997
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21. The OSCAR code: a simulation tool to assess the PWR contamination for decommissioning

Author

DACQUAIT, Frederic, GENIN, J-Baptiste, FRANCESCATTO, Jerome, Benier, Gilles, GALASSI, Gaëlle, BROUTIN, Francois, Gherrab, Mehdi, Tevissen, Etienne, YOU, Dominique, Jobert, Thomas, CHIRENT, Thomas, Engler, Nathalie, Mariet, Clarisse, Laboratoire de Maitrise de la contamination et de la Chimie des Caloporteurs et du Tritium (LMCT), Service Mesures et modélisation des Transferts et des Accidents graves (SMTA), Département Technologie Nucléaire (DTN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département Technologie Nucléaire (DTN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, EDF (EDF), and FRAMATOME

Subjects
contamination, decommissioning, PWR, OSCAR, source term, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], simulation
Abstract

International audience; Knowing the contamination state of the end-of-life nuclear reactor systems by Long-Lived RadioNu-clides (LLRNs) is a key stage for the decommissioning process. Indeed, the initial state is necessary to optimize the decommissioning works and to manage the radioactive waste as well. To address this issue, the contamination state is usually characterized using different types of techniques: in-situ gamma spectrometry, gamma camera scanning, dose rate measurements, , ,  measurements of samples obtained by smears or scrapings and then chemical separation processes, scaling factor approach… To reduce the amount of these measurements and thus the Occupational Radiation Ex-posure (ORE) and the decommissioning costs, a method is to assess the level of contamination by simulation. Furthermore, at the design stage of a new reactor, its decommissioning has to be taken into account and a simulation tool, such as the OSCAR code, can predict the radioactive source term at the end of life of a future reactor.The OSCAR code (Outil de Simulation de la ContAmination en Réacteur - tOol of Simulation of Con-tAmination in Reactor) has been developed by the CEA in collaboration with EDF and Framatome since the 1970s. The OSCAR code simulates the production and transfer of Activated Corrosion Products (ACPs) and Actinides and Fission Products and (AFPs) in the reactor systems and thus calculates the masses and activities of radionuclides deposited inside piping and heat exchangers of different circuits. As the OSCAR code has been originally devoted to mainly an industrial objective, which is the reduction of the Occupational Radiation Exposure (ORE) for operating PWRs, it deals with the main ACPs, 60Co, 58Co, 54Mn…, which are short-lived radionuclides. Nevertheless, it also cal-culates LLRNs of interest for decommissioning, such as 55Fe, 63Ni, 90Sr, 239Pu…, most of which are difficult to measure. The OSCAR code is validated through on-site measurements, including the EMECC campaigns, an operational experience feedback unique in the world, that consist of measur-ing the gamma surface activities mainly of the PWR primary system but also of auxiliary systems.After a presentation of the features and modeling of the OSCAR code, the paper will present some OSCAR simulation results of long-lived ACPs and AFPs deposited inside PWR circuits and their comparison with measurements. Perspectives of the OSCAR code on the decommissioning pro-grams will also be discussed.

Published
2021

28. Inverse method to predict temperature and heat flux distribution in a cutting tool

Author

Xu, W., Genin, J., and Dong, Q.

Subjects
Heat -- Conduction, Thermodynamics -- Research, Engineering and manufacturing industries, Science and technology
Abstract

Researchers have developed a inverse problem for the thermoelastic model to address the contact problem in orthogonal cutting. This work aimed to establish the chip contact length, thermal gradient in the tool and contact stresses on the tool-workpiece interface. A Lower and Upper triangular Decomposition approach was used to solve the uniquely determined problem. It was found that the inverse problem is an ill-posed boundary value problem from the mathematical point of view. Its sensitivity matrix is very significant in the accuracy of the solution.

Published
1997

39. Mossbauer and XAS study of a green rust mineral; the partial substitution of [Fe.sup.2+] by [Mg.sup.2+]

Author

REFAIT, P., ABDELMOULA, M., TROLARD, F., GENIN, J-M. R., EHRHARDT, J.J., and BOURRIE, G.

Subjects
Minerals -- Analysis, Mineralogical research -- Analysis, Chemistry, Analytic -- Research, Earth sciences
Abstract

Layered double hydroxysalt green rusts, GRs, are very reactive compounds and their general formula, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] where x is the ratio [Fe.sup.3+]/[Fe.sub.tot], reflects the structure in which brucite-like layers alternate with interlayers of anions [A.sup.n-] and water molecules. A GR mineral was extracted from hydromorphic soils in Fougeres (France) and studied by X-ray absorption spectroscopy (XAS) and transmission Mossbauer spectroscopy (TMS). The XAS spectrum at the Fe K absorption edge of this mineral proved to be very similar to that of synthetic GRs. However, the radial distribution function obtained for the GR mineral proved to be intermediate between those of GR([MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]) and pyroaurite, that is between the [Fe.sup.2+]-[Fe.sup.3+] and [Mg.sup.2+]-[Fe.sup.3+] hydroxycarbonates. Consequently, a partial substitution of [Fe.sup.2+] by [Mg.sup.2+] occurs, leading to the general formula of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] where [A.sup.n-] is the interlayer anion. Unfortunately, the XAS spectra of various GR proved to be independent of the interlayer anion, and the nature of the anions present in the mineral GR could not be determined. The Mossbauer spectrum of the mineral, measured at 77 K, is composed of four quadrupole doublets: [D.sub.1] and [D.sub.2] due to [Fe.sup.2+] [[Delta] [approximately equals] 1.26 mm/s and [[Delta]E.sup.Q] [approximately equal] 2.5 and 2.9 mm/s, respectively] and [D.sup.3] and [D.sup.4] due to [Fe.sup.3+] [[Delta] [approximately equal] 0.46 mm/s and [[Delta]E.sup.Q] [approximately equal] 0.5 and 1.0 mm/s, respectively]. Finally, synthetic [Mg.sup.2+]-[Fe.sup.2+]-[Fe.sup.3+] hydroxycarbonates could be prepared by coprecipitation from Mg and Fe salts and lead to Mossbauer spectra similar to that of the mineral. In particular, the partial substitution of [Fe.sup.2+] by [Mg.sup.2+] proved to be consistent with the existence of the unusual doublet [D.sup.4].

Published
2001

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