Execute nearest point on initialization to set valid temperatures on the...

Execute nearest point on initialization to set valid temperatures on the openmc model before the first step is executed.

1568_pebble_yuhsiang_E524k/openmc_master.i

@@ -75,7 +75,7 @@
   [./average_temp]
     type = NearestPointAverage
     variable = temp
-    execute_on = 'timestep_end' # Evaluate on timestep end so OpenMC can get updated values next timestep
+    execute_on = 'initial timestep_end' # Evaluate on timestep end so OpenMC can get updated values next timestep
     points = '1.055000000000000071e+01 -1.294999999999999929e+00 -1.584999999999999964e+01
 1.290000000000000036e+01 -3.450000000000000178e+00 -1.584999999999999964e+01
 9.400000000000000355e+00 -7.400000000000000355e+00 -1.584999999999999964e+01