Pressurized water reactor

A diagram of a pressurized water reactor.

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% Pressurized Water Reactor
% Author: Gloria Faccanoni 
%
\documentclass[a4paper,10pt,landscape]{article}
\usepackage[latin1]{inputenc}
\usepackage[Gray]{SIunits}
\usepackage[dvipsnames,pdftex,fixpdftex]{xcolor}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usepackage[hmargin=1cm,vmargin=1cm]{geometry}
\begin{document}
\centering
\begin{tikzpicture}[
        scale=0.7,
        annotline/.style = {stealth-},
        arrows1loop/.style={->,red},
        arrows2loop/.style={->,white},
        arrows3loop/.style={->,draw=Gray},
    ]
\draw[draw=Gray,double=Gray!10,double distance=4pt]
    (12,12) to[out=135,in=45](0,12)--(0,0)--(22,0)--(22,12)--(12,12)--(12,0);
\node[text width=4cm, text centered,font=\small] at (6,13)
    {Containment\\structure};
% legend
\begin{scope}[yshift=-2cm]
    \filldraw[draw=red,fill=red!10] (1,0) rectangle ++(2,1);
    \node[text width=4cm, font=\small,right] at (3,0.5)
        {Pressurized water\\(primary loop)};
    \filldraw[draw=blue,bottom color=blue!40,top color=Gray!30]
        (11,0) rectangle ++(2,1);
    \node[text width=4cm, font=\small,right] at (13,0.5)
        {Water and steam\\(secondary loop)};
    \filldraw[draw=Blue,fill=Blue!10] (21,0) rectangle ++(2,1);
    \node[text width=4cm, font=\small,right] at (23,0.5)
        {Water\\(cooling loop)};
\end{scope}
% 2nd loop --------------------------------------------------------------------
\begin{scope}[xshift=7.25cm,yshift=3cm]
 
 
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