Draw Nuclear Reactor with moving flows

Draw Nuclear Reactor with moving flows

I want to draw a nuclear reactor. In texamples.net there is a template which is pretty much what I would like to do. The code is
% Pressurized Water Reactor
% Author: Gloria Faccanoni http://www.science.unitn.it/~gloria/home.htm
%
\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/.s