New capabilities of simulating fission product transport in circuits with ASTEC/SOPHAEROS v.1.3

Cousin, F.; Dieschbourg, K.; Jacq, F.

doi:10.1016/j.nucengdes.2008.03.018

Cited by 41 publications

(16 citation statements)

References 18 publications

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“…For example, for particles in the size range 1 nm -10 μm, the upper bound is N B ≤ 50. Subsequent simplifi cation is associated with the supposition that all particles, irrespective of size, have the same composition as, for example, in the SOPHAEROS module [6,7], determined by the overall mass balance of the components in the aerosol phase. Then, the composition of the particles does not change upon coagulation.…”

Section: Methods Of Fixed Monodispersed Modesmentioning

confidence: 99%

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Modeling the Coagulation of Aerosols of Fission Products

Sorokin

2015

At Energy

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Methods for modeling the coagulation in an aerosol code developed for calculating the behavior of multicomponent aerosols are examined. A comparative analysis is made and the methods are tested on model problems for conditions characterizing the formation of aerosols of fi ssion products in the fi rst loop of VVER during an accident with depressurization of fuel elements.The primary method for performing a safety analysis of NPP and radiation contamination of the environment as a result of a beyond design basis accident is modeling, using special integral codes, the behavior of the reactor at all stages of the accident. Accurate modeling of the formation and transport of aerosols in the fi rst loop is a necessary condition for making a quantitative assessment of the radiation contamination of the rooms in the containment shell [1,2]. Aerosols are formed as a result of nucleation of vapors of fi ssion products, structural materials, and possibly uranium oxides of the fuel matrix. Particles of the corrosion and aerosols of nonvolatile fi ssion products can also be a source of heterogeneous centers. The radius of the aerosol particles in the fi rst loop during an accident ranges from 10 -9 to 10 -5 m [2-4].A code is being developed for modeling the behavior of multicomponent aerosols. A spatial cell with a uniform distribution of the gas and aerosol components and the thermodynamic parameters of the medium is studied. The approximation with composite particles whose composition is the average for all particles of a given size is being examined. In addition, the composition can be different for particles of different size. We note that the direct modeling of the dynamics of multicomponent aerosols presupposes that the dependence of the phase density of the particles on the mass of the components comprising a particle is taken into account. However, this approach is currently not implemented in the integral codes because the computational time is excessive.A universal method of modeling the dynamics of aerosol particles is the method of fractions. In this method, the particle size spectrum, for example, of a volume, is subdivided into individual fractions with fi xed or moving boundaries. As a result, the general integro-differential equation governing the dynamics of aerosols becomes a system of nonlinear fi rst-order differential equations for the concentration or mass of the particles in each fraction [2,5]. The main drawback of this method is induced numerical diffusion along the size axis as a result of the artifi cial redistribution of a defi nite fraction of the particles formed after collisions into a fraction with sizes larger than the actual size. An obvious method of minimizing the effect is to increase the number fractions considered. However, in this case, the computing time increases accordingly as the squared size of the system of equations. For this reason, it is important to use effi cient numerical algorithms to minimize the computing time while maintaining acceptable accuracy.In the present work, tw...

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Section: Methods Of Fixed Monodispersed Modesmentioning

confidence: 99%

“…In the present work, two approaches of the fractional method, considered as options in the model being developed, are compared on model problems: fi xed monodispersed modes -the simplifi ed version is used in the module SOPHAEROS [6,7] -and fi xed average monodispersed modes [8].…”

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confidence: 99%

Modeling the Coagulation of Aerosols of Fission Products

Sorokin

2015

At Energy

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“…The latter are computed by the SOPHAEROS module [19] which takes into account the vapour phenomenas (chemical reaction, condensation and homogeneous nucleation) and the aerosol behaviour as the agglomeration, deposition, the mechanical resuspension and the heterogeneous nucleation. This modelling considers control volumes in which it is assumed that the vapour phase is at the thermodynamic equilibrium.…”

Section: Simulation Of Accidental Scenariomentioning

confidence: 99%

Progress on source term evaluation of accidental events in the experimental fusion installation ITER

Virot

Barrachin

Vola

2015

Fusion Engineering and Design

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“…The average particle size and geometric standard deviation are taken from those used in an analysis with the SOPHAEROS code (Cousin et al, 2008). STORM test SR11 Phase 6 conditions (see Table 3)…”

Section: Average Radius (µM)mentioning

confidence: 99%

Resuspension of small particles from multilayer deposits in turbulent boundary layers

Zhang

Reeks

Kissane

et al. 2013

Journal of Aerosol Science

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We present a hybrid stochastic model for the resuspension of micron-size particles from multilayer deposits in a fully-developed turbulent boundary layer. The rate of removal of particles from any given layer depends upon the rate of removal of particles from the layer above which acts as a source of uncovering and exposure of particles to the resuspending flow. The primary resuspension rate constant for an individual particle within a layer is based on the Rock'n'Roll (R'n'R) model using non-Gaussian statistics for the aerodynamic forces acting on the particles (Zhang et al., 2012). The coupled layer equations that describe multilayer resuspension of all the particles in each layer are based on the generic lattice model of Friess & Yadigaroglu (2001) which is extended here to include the influence of layer coverage and particle size distribution. We consider the influence of layer thickness on the resuspension along with the spread of adhesion within layers, and the statistics of non-Gaussian versus Gaussian removal forces including their timescale. Unlike its weak influence on long-term resuspension rates for monolayers, this timescale plays a crucial and influential role in multilayer resuspension. Finally we compare model predictions with those of a large-scale and a mesoscale resuspension test, STORM (Castelo et al., 1999) and BISE (Alloul-Marmor, 2002).

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New capabilities of simulating fission product transport in circuits with ASTEC/SOPHAEROS v.1.3

Cited by 41 publications

References 18 publications

Modeling the Coagulation of Aerosols of Fission Products

Modeling the Coagulation of Aerosols of Fission Products

Progress on source term evaluation of accidental events in the experimental fusion installation ITER

Resuspension of small particles from multilayer deposits in turbulent boundary layers

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