Yields are higher in fast fission or in fission of heavier nuclei.
2.
Fast fission of in the secondary stage of a nuclear weapon contributes greatly to fallout.
3.
Fast fission or fission of some heavier actinides will produce 121m Sn at higher yields.
4.
The fast fission of also makes a significant contribution to the power output of some fast-neutron reactors.
5.
For example, its yield from U-235 is 0.0007 % per thermal fission and 0.002 % per fast fission.
6.
It was estimated that 15 20 % of the energy was released by fusion ( 60 80 kilotons ) and the rest was from fast fission.
7.
In the proposed water-cooled supercritical water reactor ( SCWR ), the proportion of fast fissions may exceed 50 %, making it technically a fast neutron reactor.
8.
"' BES-5 "'is an acronym for a Russian thermo-electric generator design in which the heat source is a fast fission nuclear reactor ( FNR ).
9.
Pressurized water reactors, like all thermal reactor designs, require the fast fission neutrons to be slowed down ( a process called moderation or thermal ) in order to interact with the nuclear fuel and sustain the chain reaction.
10.
However, fast neutrons have a better fission / capture ratio for many nuclides, and each fast fission releases a larger number of neutrons, so a fast breeder reactor can potentially " breed " more fissile fuel than it consumes.
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