Canada continues to promote peaceful nuclear technology exemplified by the CANDU reactor. Unlike most designs, the CANDU does not require enriched fuel, and in theory is therefore much less likely to lead to the development of weaponized missile fuel. However, like all power reactor designs, CANDU reactors produce and use plutonium in their fuel rods during normal operation (roughly 50% of the energy generated in a CANDU reactor comes from the "in situ" fission of plutonium created in the uranium fuel), and this plutonium could be used in a nuclear explosive if separated and converted to metallic form (albeit only as reactor-grade plutonium, and therefore of limited military usefulness). Accordingly, CANDU reactors, like most power reactors in the world, are subject to safeguards under the United Nations which prevent possible diversion of plutonium. CANDU reactors are designed to be refuelled while running, which makes the details of such safeguards significantly different from other reactor designs. The end result, however, is a consistent and internationally accepted level of proliferation risk. The CANDU reactor was also proposed as a means of destroying surplus plutonium through using MOX fuel due to is capability of online fuel shuffling providing flexibility to deal with different reactor kinetics.