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Saint-Pierre-du-Chemin, France

le Barillec O.,Adixen | Davenet M.,Adixen | Favre A.,Adixen | Bellet B.,INOPRO | And 4 more authors.
Solid State Phenomena | Year: 2013

Based on recent progress on laser-based wafer dicing equipment and process, the partners adixen, Fraunhofer IISB and JENOPTIK investigated the use of a vacuum based decontamination process to dry and to decontaminate the substrate surface of the diced wafers from water residuals, which are a side-effect of the TLS (thermal laser separation) approach. The decontamination process was achieved by using an adixen vacuum drying module prototype further to the JENOPTIK TLS dicing process. Within the frame of the European collaborative project "SEAL", supported by the European Commission, experimental assessment was conducted by Fraunhofer IISB (research institution) together with JENOPTIK and Adixen. © (2013) Trans Tech Publications, Switzerland. Source

Aufiero M.,Polytechnic of Milan | Brovchenko M.,Grenoble Institute of Technology | Cammi A.,Polytechnic of Milan | Clifford I.,Pennsylvania State University | And 8 more authors.
Annals of Nuclear Energy | Year: 2014

This paper deals with the calculation of the effective delayed neutron fraction (βeff) in circulating-fuel nuclear reactors. The Molten Salt Fast Reactor is adopted as test case for the comparison of the analytical, deterministic and Monte Carlo methods presented. The Monte Carlo code SERPENT-2 has been extended to allow for delayed neutron precursors drift, according to the fuel velocity field. The forward and adjoint eigenvalue multi-group diffusion problems are implemented and solved adopting the multi-physics tool-kit OpenFOAM, by taking into account the convective and turbulent diffusive terms in the precursors balance. These two approaches show good agreement in the whole range of the MSFR operating conditions. An analytical formula for the circulating-to-static conditions βeff correction factor is also derived under simple hypotheses, which explicitly takes into account the spatial dependence of the neutron importance. Its accuracy is assessed against Monte Carlo and deterministic results. The effects of in-core recirculation vortex and turbulent diffusion are finally analysed and discussed. © 2013 Elsevier Ltd. All rights reserved. Source

Rouch H.,INOPRO | Geoffroy O.,INOPRO | Rubiolo P.,Grenoble Institute of Technology | Laureau A.,Grenoble Institute of Technology | And 3 more authors.
Annals of Nuclear Energy | Year: 2014

A thermal-hydraulics study of the core of the Molten Salt Fast Reactor (MSFR) is presented. The numerical simulations were carried-out using a Computation Fluid Dynamic code. The main objectives of the thermal-hydraulics studies are to design the core cavity walls in order to increase the overall flow mixing and to reduce the temperature peaking factors in the salt and on the core walls. The results of the CFD simulations show that for the chosen core design acceptable temperature distributions can be obtained by using a curved core cavity shape, inlets and outlets. The hot spot temperature is less than 10 C above the average core outlet temperature and is located in the centre of the top wall of the core. The results show also a moderate level of sensitivity to the working point. © 2013 Elsevier Ltd. All rights reserved. Source

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