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\subsection{Modules}\label{sect:mod}
\vskip 0.2cm
Reactor calculations using DONJON are performed by means of
sequential execution of several user-selected modules, according to the
user-defined computing scheme.
Each module is designed to perform some particular tasks.
The detailed description of DONJON modules is given in \Sect{modesc1}
to \Sect{modesc4}.
In order to perform the reactor calculations, it is also
required to use some DRAGON and TRIVAC modules.
For more details on DRAGON modules specification, refer to its user
guide\cite{dragon}; for more details on TRIVAC modules
specification, refer to its user guide\cite{trivac}.
Because the code execution is controlled by CLE-2000,
it is also possible to use the DRAGON utility modules\cite{cle2000,dragon}.
A brief description
of each module that can be executed using DONJON is given below.
A short description of each data structure that can be used in DONJON
is given in \Sect{dat}.\\
\vskip 0.2cm
\begin{itemize}
\item The following DRAGON modules can be executed using DONJON:
\end{itemize}
\vskip 0.2cm
\begin{ListeDeDescription}{mmmmmmmm}
\item[\moc{GEO:}] module used to create or modify a reactor geometry.
The spatial locations of the reactor material mixtures must also be defined
using the \moc{GEO:} module. Only \dusa{3-D} Cartesian reactor geometries
are allowed with DONJON.
\item[\moc{MAC:}] module used to create or modify a \dds{macrolib}
containing the material properties, by directly specifying the group-ordered
macroscopic cross-sections for each selected material mixture.
\end{ListeDeDescription}
\vskip 0.2cm
\begin{itemize}
\item The following TRIVAC modules can be executed using DONJON:
\end{itemize}
\vskip 0.2cm
\begin{ListeDeDescription}{mmmmmmmm}
\item[\moc{TRIVAT:}] module used to perform a \dusa{3-D}
numerical discretization or ``tracking" of the reactor geometry.
\item[\moc{TRIVAA:}] module used to compute the set of system
matrices with respect to the previously obtained "tracking" information.
\item[\moc{FLUD:}] module used to compute the numerical solution
to an eigenvalue problem, corresponding to a previously obtained
set of system matrices.
\end{ListeDeDescription}
\vskip 0.2cm
\begin{itemize}
\item The following are short descriptions of utility modules that
can be executed using DONJON:
\end{itemize}
\vskip 0.2cm
\begin{ListeDeDescription}{mmmmmmmm}
\item[\moc{UTL:}] module used to perform several utility actions
on a data structure.
\item[\moc{DELETE:}] module used to delete one or many data structures.
\item[\moc{GREP:}] module used to extract a single value from a data structure.
\item[\moc{END:}] module used to delete all the local linked lists, to close
all the remaining local files and to return from a procedure; or to terminate
the overall DONJON execution controlled by the GAN generalized driver.
\end{ListeDeDescription}
\vskip 0.2cm
\begin{itemize}
\item The following are short descriptions of DONJON modules:
\end{itemize}
\vskip 0.2cm
\begin{ListeDeDescription}{mmmmmmmm}
\item[\moc{CRE:}] module used to create a \dds{macrolib} containing
the material properties, by interpolating the nuclear properties from a
mono-parameter database, previously generated in the lattice code.
\item[\moc{NCR:}] module used to create a \dds{microlib} or a \dds{macrolib} containing
the material properties, by interpolating the nuclear properties from a
multi-parameter database, previously generated in the lattice code.
\item[\moc{AFM:}] module used to create a \dds{macrolib} containing
the material properties, by interpolating the nuclear properties from a
multi-parameter feedback model database, previously generated in the lattice code.
\item[\moc{USPLIT:}] module used to create an extended reactor
material index over the whole mesh-splitted reactor geometry.
\item[\moc{RESINI:}] module used to define the fuel lattice, to create
the fuel-map geometry and to specify the global and local parameters.
\item[\moc{MACINI:}] module used to create an extended \dds{macrolib},
in which the properties are stored per each material region, over the
whole mesh-splitted reactor geometry.
\item[\moc{DEVINI:}] module used for \dusa{3-D} modeling of rod-type
devices in the reactor core.
\item[\moc{DETINI:}] module used to read and store detector information.
\item[\moc{LZC:}] module used for \dusa{3-D} modeling of liquid zone
controllers in the reactor core.
\item[\moc{DSET:}] module used to set the new devices parameters,
that can be used for the reactivity worth studies.
\item[\moc{MCC:}] module used to modify the fuel map in order to compute a Doppler
or general reactivity coefficient.
\item[\moc{MOVDEV:}] module used to compute the time-dependent
positions of the moving rod-type devices.
\item[\moc{NEWMAC:}] module used to create an extended \dds{macrolib},
that will contain the updated material properties, computed with respect to
the actual devices positions.
\item[\moc{FLPOW:}] module used to compute and print powers
and normalized fluxes over the reactor core.
\item[\moc{TAVG:}] module used to perform burnups calculation
according to the time-average model, compute burnups integration
limits, core-average exit burnup, axial power-shapes and channel
refuelling rates.
\item[\moc{TINST:}] module used to perform burnups calculation
according to the time-linear model and compute instantaneous burnups
values. This module is specific to Candu reactor refuelling.
\item[\moc{SIM:}] module used to perform burnups calculation
according to the time-linear model and compute instantaneous burnups
values. This module is specific to PWR reactor refuelling.
\item[\moc{DETECT:}] module used to compute the mean flux at each detector site
and the response of each detector according to different types of
interpolation.
\item[\moc{CVR:}] module used for the core-voiding simulations.
\item[\moc{HST:}] module used to manage a full reactor execution in DONJON using explicit DRAGON
calculations for each cell (see \Sect{HSTData}).\cite{hst}
\item[\moc{NAP:}] pin power reconstruction module.\cite{Chambon2014,Fliscounakis2011}
\end{ListeDeDescription}
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