Disclosed are an implementation method for a fast reactor type coupled
nuclear reaction, a
nuclear reactor and a fuel element therefor. A main reactor vessel of the
nuclear reactor comprises a
fission pool (201) and a moderation
pool (301) which are completely isolated from each other but coupled with each other, a reactor core (250) with fast
neutron characteristics is arranged in the
fission pool (201), moderator is arranged in the moderation pool (301), primary
coolant is separated from the moderator, and the primary
coolant passes through the
fission pool (201) rather than the moderation pool (301); and a heat
insulation layer is arranged between the fission pool (201) and the moderation pool (301) to block the heat exchange therebetween. Neutrons are allowed to pass through between the fission pool (201) and the moderation pool (301), so that the fission pool (201) and the moderation pool (301) can perform
neutron exchange and a coupled
nuclear reaction, fast neutrons produced by the reactor core (250) and moderated neutrons reflected into the fission pool (201) from the moderation pool (301) can make the reactor core (250) simultaneously perform coupled nuclear reactions induced by the fast neutrons and the moderated neutrons, thermal
neutron nuclear reaction can take place in the moderation pool (301), and the moderation pool (301) can be provided with a nuclear
control system and can implement ex-core coupled nuclear control. Because the moderation pool (301) of the fast reactor type coupled
nuclear reactor is provided with a
thorium breeding fuel
system, bred fuel can be extracted on line, nuclear element separation is safe and simple, and a solution is provided for the
bottleneck of the
thorium reactor technology.