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+\subsection{The DRAGON Modules}\label{sect:DragonModules}
+
+The code DRAGON has been divided into main calculations sequences to
+which is generally associated a single calculation module. The only exception
+to this rule is the tracking sequence to which is associated many different
+modules, one for each of the standard CP calculation options and an additional
+module for diffusion calculations. However, this later module can only be used
+indirectly in the edition module of DRAGON. These modules perform the
+following tasks:
+  
+\begin{ListeDeDescription}{mmmmmmmm}
+
+\item[\moc{MAC:}]  module used to generate or modify a DRAGON
+\dds{macrolib} (see \Sect{DragonDataStructures}) which contains the group ordered
+macroscopic cross sections for a series of mixture (see \Sect{MACData}). This
+\dds{macrolib} can be either an independent data structure or it can be included
+as a substructure in a \dds{microlib}. The spatial location of these mixtures
+will be defined using the \moc{GEO:} module (see \Sect{GEOData}).
+
+\item[\moc{LIB:}]  module used to generate or modify a DRAGON
+\dds{microlib} (see \Sect{DragonDataStructures}) that can read a number of
+different types of microscopic cross-section libraries (see \Sect{LIBData}). Each
+such access requires a double interpolation (temperature, dilution) carried out
+by a subroutine specifically tailored to each type of library. Currently the
+formats DRAGLIB\cite{DragonDataStructures}, WIMS--D4\cite{WIMS-D}, MATXS\cite{MATXS}, WIMS--AECL\cite{WIMS}, 
+APOLLO\cite{Apollo,Apollo2} and NDAS format\cite{ndas} are supported. After having reconstructed the  microscopic
+cross sections for each isotope, they are then  multiplied  by the isotopic
+concentrations (particles per $cm^{3}$) and combined in such a way as to produce
+an embedded \dds{macrolib} (see \Sect{DragonDataStructures}). The spatial location
+of these mixtures will be defined using the \moc{GEO:} module (see
+\Sect{GEOData}).
+
+\item[\moc{GEO:}] module used to generate or modify a
+geometry (see \Sect{GEOData}).
+
+\item[\moc{SYBILT:}] the standard tracking module based on 1D collision
+probability or Interface Current technique (see \Sect{TRKData} and \Sect{SYBILData}).
+
+\item[\moc{EXCELT:}] the standard tracking module for 2D and 3D geometries as well as isolated 2D 
+cells containing clusters (see \Sect{TRKData} and \Sect{EXCELLData}).
+
+\item[\moc{NXT:}] the standard tracking module for 2D or 3D assemblies of cluster (see
+\Sect{TRKData} and \Sect{NXTData}).
+
+\item[\moc{SNT:}] the discrete ordinates tracking module (see
+\Sect{TRKData} and \Sect{SNData}).
+
+\item[\moc{MCCGT:}] the tracking module of the open characteristics flux
+solver (see \Sect{TRKData} and \Sect{MCCGData}).
+
+\item[\moc{BIVACT:}] the 1D/2D diffusion and $SP_n$ tracking module (see
+\Sect{TRKData} and \Sect{BIVACData}).
+
+\item[\moc{TRIVAT:}] the 1D/2D/3D diffusion and $SP_n$ tracking module (see
+\Sect{TRKData} and \Sect{TRIVACData}).
+
+\item[\moc{SHI:}] module used to perform self-shielding calculations
+based on the generalized Stamm'ler method (see \Sect{SHIData}).
+
+\item[\moc{TONE:}] module used to perform self-shielding calculations
+based on the Tone's method (see \Sect{TONEData}).
+
+\item[\moc{USS:}] module used to perform self-shielding calculations
+based on a subgroup method (see \Sect{USSData}). A method using physical
+probability tables (cf. Wims-7 and Helios) and the Ribon extended method
+are available.
+
+\item[\moc{AUTO:}] module used to perform self-shielding calculations
+based on the Autosecol method (see \Sect{AUTOData}).
+
+\item[\moc{ASM:}] module which uses the tracking information to
+generate a multigroup response or collision probability matrix (see
+\Sect{ASMData}).
+
+\item[\moc{FLU:}] module which uses inner-iteration approach or
+collision probability matrix to solve the transport equation for the fluxes
+(see \Sect{FLUData}). Various leakage models are available.
+
+\item[\moc{EDI:}] editing module (see \Sect{EDIData}). An equivalence method based
+on SPH method is available.
+
+\item[\moc{EVO:}] burnup module (see \Sect{EVOData}).
+
+\item[\moc{SPH:}] {\sl supermomog\'en\'eisation} (SPH) module (see \Sect{SPHData}). The \moc{SPH:}
+module can also be used to extract a \dds{microlib} or \dds{macrolib} from a \dds{multicompo} or \dds{saphyb}.
+
+\item[\moc{INFO:}] utility to compute number densities for selected isotopes in materials such as
+UO$_{2}$ or ThUO$_{2}$ (see \Sect{INFOData}).
+
+\item[\moc{COMPO:}] multi-parameter reactor database construction module (see
+\Sect{COMPOData}).
+
+\item[\moc{TLM:}] module used to generate a Matlab M-file to obtain a graphics representation of the \moc{NXT:} 
+tracking lines (see \Sect{TLMData}).
+
+\item[\moc{M2T:}] interface module for transforming a macrolib into a Trimaran/Tripoli multigroup file (see \Sect{M2TData}).
+
+\item[\moc{CHAB:}] cross section perturbation module similar to CHABINT (see \Sect{CHABData}).
+
+\item[\moc{CPO:}] burnup-dependent mono-parameter reactor database construction module (see \Sect{CPOData}).
+
+\item[\moc{SAP:}] multi-parameter reactor database construction module in SAPHYB format (see \Sect{SAPHYBData}).
+
+\item[\moc{MPO:}] multi-parameter reactor database construction module in MPO format (see \Sect{MPOData}).
+
+\item[\moc{MC:}] multigroup Monte-Carlo flux solution module (see \Sect{MCData}).
+
+\item[\moc{T:}] macrolib transposition operator (see \Sect{TData}).
+
+\item[\moc{DMAC:}] construction module for a Generalized Perturbation Theory (GPT) source (see \Sect{DMACData}).
+
+\item[\moc{SENS:}] sensitivity analysis of keff to nuclear data (see \Sect{SENSData}).
+
+\item[\moc{PSP:}] module to generate PostScript images for 2D geometries that can be tracked using the module 
+\moc{EXCELT:} or \moc{NXT:} (see \Sect{PSPData}).
+
+\item[\moc{DUO:}] module to perform a perturbative analysis of two systems using the Clio formula and to determine the origins
+of Keff discrepancies (see \Sect{DUOData}).
+\end{ListeDeDescription}
+
+A few modules ({\tt G2S:}, {\tt G2MC:} and {\tt SALT:}) have been introduced in DRAGON Version5 in
+order to facilitate the
+processing of geometries originating from the Geometry module of SALOME.\cite{salome}
+The methods presented in this section have been initially developed at CEA SERMA and
+integrated in the TDT code.\cite{tdt,lyioussi} In the course of year 2001, a subset of
+these methods have been integrated into a development version of DRAGON under the terms
+of its LGPL license as a prototyping exercise of the DESCARTES operation.\cite{salt}
+
+\vskip 0.08cm
+
+The track generator {\tt SALT:} is a direct descendent of this prototyping exercise.
+Later, we have extracted the 5000 lines of Fortran-90 code responsible for the track
+calculation and have rewritten them in a way consistent with the {\tt NXT:} tracking
+methodology and with the DRAGON architecture.
+
+\vskip 0.08cm
+
+The {\tt SALT:} module can process two types of geometries:
+\begin{itemize}
+\item {\sl Native geometries} are those defined using the {\tt GEO:} module and transformed into surfacic
+geometries using the {\tt G2S:} module. These geometries have many limitations related to their
+definition.
+\item {\sl Non-native geometries} are surfacic representations based on extensions of the SALOME platform.
+A first extension is the SALOMON tool presented in Ref.~\citen{ane15b}. ALAMOS is a more recent tool
+available at the Commissariat \`a l'\'Energie Atomique.\cite{alamos} Surfacic geometries produced by
+ALAMOS must be converted to the SALOMON format using the {\tt G2S:} module before calling the track
+generator {\tt SALT:}.
+\end{itemize}