21. Discharges from nuclear plants within the nuclear fuel cycle introduce fission products to the environment. 22. In principle, breeder fuel cycles can recycle and consume all actinides, leaving only fission products. 23. The uranium fuel cycle is spread across a number of facilities in the United States. 24. Protactinium-233 is also part of the thorium fuel cycle . 25. In thorium fuel cycle thorium-232 absorbs a neutron in either a fast or thermal reactor. 26. Uranium enrichment is part of the fuel cycle . 27. As a research and development program, GNEP is an outgrowth of the Advanced Fuel Cycle Initiative 28. This is the chemistry associated with any part of the nuclear fuel cycle , including nuclear reprocessing. 29. Thorium is an alternate fuel cycle to uranium. 30. It is, however, not trivial to compare the power density produced by different fusion fuel cycles .
