  The supercritical, reactor core melting and nuclear fuel leaking accidents
have troubled fission reactors for decades, and greatly limit their extensive
applications. Now these troubles are still open. Here we first show a possible
perfect reactor, Molten-Salt Depleted-Uranium Reactor which is no above
accident trouble. We found this reactor could be realized in practical
applications in terms of all of the scientific principle, principle of
operation, technology, and engineering. Our results demonstrate how these
reactors can possess and realize extraordinary excellent characteristics, no
prompt critical, long-term safe and stable operation with negative feedback,
closed uranium-plutonium cycle chain within the vessel, normal operation only
with depleted-uranium, and depleted-uranium high burnup in reality, to realize
with fission nuclear energy sufficiently satisfying humanity long-term energy
resource needs, as well as thoroughly solve the challenges of nuclear
criticality safety, uranium resource insufficiency and low-carbon development.
They could provide safe, cheap, abundant, and clean energy resource and
electric power lasting thousands years for humanity.
