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+\subsection{The \moc{MOVDEV:} module}\label{sect:movdev}
+
+\vskip 0.2cm
+The \moc{MOVDEV:} module can be used for the transient simulations and
+reactor control studies, which are related to the time-dependent rod-devices
+displacement in the reactor core. The rods can be inserted into or extracted
+from the reactor core, at constant or at variable speed of movement. The rod
+positions are recomputed at every given time step of movement. The new rod
+positions can be computed in several ways, based on either: current time increment
+and movement speed; relative change in rod positions; \dusa{or} current rod
+insertion level. The \moc{MOVDEV:} module allows the rod-devices to be
+displaced individually or simultaneously in groups.\\
+
+\noindent
+The \moc{MOVDEV:} module specification is:
+
+\begin{DataStructure}{Structure \moc{MOVDEV:}}
+\dusa{DEVICE} \moc{:=} \moc{MOVDEV:}
+\dusa{DEVICE} \moc{::} \dstr{descmove}
+\end{DataStructure}
+
+\noindent where
+
+\begin{ListeDeDescription}{mmmmmmmm}
+
+\item[\dusa{DEVICE}] \texttt{character*12} name of the \dds{device}
+object that will be modified by the module. The rods positions are updated
+according to the current time step of movement.
+
+\item[\dstr{descmove}] structure describing the input data to the
+\moc{MOVDEV:} module.
+
+\end{ListeDeDescription}
+
+\vskip 0.2cm
+
+\subsubsection{Input data to the \moc{MOVDEV:} module}\label{sect:movdevstr}
+
+It is possible to move several individual rods and/or several groups of rods
+simultaneously. A user must be aware that a particular device will not be displaced
+more than once during the same time step. Note that the input order of data to the
+module must be respected. 
+
+\begin{DataStructure}{Structure \dstr{descmove}}
+$[$ \moc{EDIT} \dusa{iprint} $]$\\
+\moc{DELT} \dusa{delt} \\
+$[[$ $\{$ \moc{ROD} \dusa{id} $|$
+\moc{GROUP} \dusa{igrp} $\}$ \\
+$\{$ \moc{INSR} $|$ \moc{EXTR} $\}$ \\
+$\{$ \moc{LEVEL} \dusa{value} $|$
+\moc{DELH} \dusa{delh} $|$
+\moc{SPEED} \dusa{speed} $\}$ $]]$  \\
+;
+\end{DataStructure}
+
+\noindent where
+\begin{ListeDeDescription}{mmmmmmmm}
+
+\item[\moc{EDIT}] keyword used to set \dusa{iprint}.
+
+\item[\dusa{iprint}] integer index used to control the printing on
+screen: = 0 for no print; = 1 for minimum printing (default value);
+larger values produce increasing amounts of output.
+
+\item[\moc{DELT}] keyword used to set \dusa{delt}.
+
+\item[\dusa{delt}] real value of the time increment for the current
+time step, given in sec.
+
+\item[\moc{ROD}] keyword used to specify the rod \dusa{id} number.
+
+\item[\dusa{id}] integer identification number of a rod-type device to be
+displaced. Each rod has a unique \dusa{id} number, ranging from 1 to
+\dusa{nrod}, as been defined in the \moc{DEVINI:} module (see \Sect{devrodstr}).
+
+\item[\moc{GROUP}] keyword used to specify a rod-group \dusa{igrp} number.
+
+\item[\dusa{igrp}] integer number of a group of rods that will be displaced
+simultaneously, with the same parameters of movement. Each group of
+rod-devices has a unique \dusa{igrp} number, ranging from 1 to \dusa{ngrp},
+as been defined in the \moc{DEVINI:} module (see \Sect{rodgroupstr}).
+
+\item[\moc{INSR}] keyword used to specify that a particular rod or a
+group of rods will be inserted into the reactor core during the period
+of time \dusa{delt}.
+
+\item[\moc{EXTR}] keyword used to specify that a particular rod or a
+group of rods will be extracted from the reactor core during the period
+of time \dusa{delt}.
+
+\item[\moc{LEVEL}] keyword used to specify the new level \dusa{value}.
+
+\item[\dusa{value}] real positive value of the rod insertion level at current
+time step. This value will be used to compute the new rod position in the
+reactor core. The insertion level is minimal (\dusa{value} = 0.0) when the
+rod is completely withdrawn, and it is maximal (\dusa{value} = 1.0) when
+the rod is fully inserted. For the partially inserted rod the insertion level
+must be: 0.0 $<$ \dusa{value} $<$ 1.0
+
+\item[\moc{DELH}] keyword used to specify the value \dusa{delh}.
+
+\item[\dusa{delh}] real positive (absolute) value of the relative change in the
+rod position during the period of time \dusa{delt}. This is a time-dependent
+rod displacement along the rod movement axis, which must be given in cm.
+
+\item[\moc{SPEED}] keyword used to set the current value of \dusa{speed}.
+
+\item[\dusa{speed}] real positive (absolute) value of the rod movement
+speed, given in cm/s. The rod speed can be kept constant or it can be
+modified at any time step \dusa{delt}. The devices could also have the
+different speeds of movement.
+
+\end{ListeDeDescription}
+\clearpage