<?xml version="1.0"?>
<geometry>

  <!--
  ==============================================================
  Description: Infinite array of fuel pins
  Case:        OECD/NEA Source Convergence Benchmark 2, Case 1_2
  Written by:  Ruaridh Macdonald
  Date:        3/5/2012
  ==============================================================
  -->

  <surface id="1" type="z-cylinder" coeffs="0. 0. 0.412" />
  <surface id="2" type="z-cylinder" coeffs="0. 0. 0.475" />

  <surface id="3"  type="z-plane" coeffs="0." boundary="vacuum" />
  <surface id="4"  type="z-plane" coeffs="30."    />
  <surface id="5"  type="z-plane" coeffs="31.75"  />
  <surface id="6"  type="z-plane" coeffs="36.75"  />
  <surface id="7"  type="z-plane" coeffs="41.75"  />
  <surface id="8"  type="z-plane" coeffs="51.75"  />
  <surface id="9"  type="z-plane" coeffs="71.75"  />
  <surface id="10" type="z-plane" coeffs="357.45" />
  <surface id="11" type="z-plane" coeffs="377.45" />
  <surface id="12" type="z-plane" coeffs="387.45" />
  <surface id="13" type="z-plane" coeffs="392.45" />
  <surface id="14" type="z-plane" coeffs="397.45" />
  <surface id="15" type="z-plane" coeffs="399.2"  />
  <surface id="16" type="z-plane" coeffs="429.2" boundary="vacuum" />

  <surface id="20" type="x-plane" coeffs="-0.665" boundary="reflective" />
  <surface id="21" type="x-plane" coeffs="0.665"  boundary="reflective" />
  <surface id="22" type="y-plane" coeffs="-0.665" boundary="reflective" />
  <surface id="23" type="y-plane" coeffs="0.665"  boundary="reflective" />

  <!-- Surrounding water -->
  <cell id="1" material="1" region="20 -21 22 -23 3   -4"    />
  <cell id="2" material="1" region="20 -21 22 -23 4  -15  2" />
  <cell id="3" material="1" region="20 -21 22 -23 15 -16"  />

  <!-- Cladding, end plugs -->
  <cell id="4" material="2" region="  -2 4  -5"  />
  <cell id="5" material="2" region="1 -2 5  -14" />
  <cell id="6" material="2" region="  -2 14 -15" />

  <!-- Fuel regions 9->1 -->
  <cell id="7"  material="4" region="-1  5 -6"  />
  <cell id="8"  material="4" region="-1  6 -7"  />
  <cell id="9"  material="4" region="-1  7 -8"  />
  <cell id="10" material="4" region="-1  8 -9"  />
  <cell id="11" material="5" region="-1  9 -10" />
  <cell id="12" material="3" region="-1 10 -11" />
  <cell id="13" material="3" region="-1 11 -12" />
  <cell id="14" material="3" region="-1 12 -13" />
  <cell id="15" material="3" region="-1 13 -14" />

</geometry>
