Big Ten Two-Zone Homogenized Benchmark IEU-MET-FAST-007

[shabudarda]

Why do I get ERROR: Maximum number of lost particles has been reached. Please reply.

<cell id="1" material="1" region="-1 3 -4" /> <!-- Central Core -->
<cell id="2" material="2" region=" -2  5 -6 1 -3 4" /> <!-- Reflector -->

<surface id="1" type="z-cylinder" coeffs="0. 0. 26.67" />
<surface id="2" type="z-cylinder" coeffs="0. 0. 41.91" boundary="vacuum" />
<surface id="3" type="z-plane" coeffs="-28.8169" />
<surface id="4" type="z-plane" coeffs="28.8169" />
<surface id="5" type="z-plane" coeffs="-48.2600" />
<surface id="6" type="z-plane" coeffs="48.2600" />

material is

<!-- Intermediate Enriched Uranium (10 wt%) -->
<material id="1">
    <density units="sum" />
    <nuclide name="U234" ao="2.4761e-05" />
    <nuclide name="U235" ao="4.8461e-03" />
    <nuclide name="U236" ao="4.3348e-05" />
    <nuclide name="U238" ao="4.2695e-02" />
</material>

<!-- Depleted Uranium -->
<material id="2">
    <density units="sum" />
    <nuclide name="U234" ao="2.8672e-07" />
    <nuclide name="U235" ao="1.0058e-04" />
    <nuclide name="U236" ao="1.1468e-06" />
    <nuclide name="U238" ao="4.7677e-02" />
</material>

and setting is

<!-- Parameters for k-eigenvalue calculation -->
<run_mode>eigenvalue</run_mode>
<batches>50</batches>
<inactive>5</inactive>
<particles>1000</particles>

<!-- Starting source -->
<source>
    <space type="box" parameters="-1  -1  -1  1  1  1" />
</source>

[paulromano]

Response given in #35