This research was supported by the U. S. Department of Energy (DOE);
Office of Nuclear Energy (NE);
Office of Science (SC);
and Office of Advanced Scientific Computing Research (ASCR) through the Scientific Discovery through Advanced Computing (SciDAC) project on Fission Gas Behavior. This research used resources of the Argonne Leadership Computing Facility;
which is a DOE Office of Science User Facility supported under Contract No. DE-AC02-06CH11357;
as well as the PNNL Institutional Computing at Pacific Northwest National Laboratory;