The reason we don't reprocess in the United States has nothing to do with economic reasons; economically it makes perfect sense with natural uranium being .725 U-235 and commercial operations at 3-5% enrichment. The reason we don't reprocess here is politically and socially influenced. The military does reprocess because they use a fairly high enrichment. TRIGA test and research reactors use 19.5% enriched fuel, which is re-processed, but General Atomics sold the TRIGA program to AREVA so fuel is shipped to France for reprocessing after use.