Design and Stress Analysis of Extraterrestrial ... - The Black Vault

Figure 2.12 is a sketch of a fast neutron reactor. The working
medium is the eutectic Na-K, the nuclear fuel uranium carbide, the
reflector beryllium, the material of the regulating cylinders
beryllium. The heat-transfer agent has a loop-type feed.
The eutectic, passing through the two-layer shell 1 of the
housing, enters the reactor core through the openings in the pipe
panel 2. Part of the heat-transfer agent goes through the central
channel in the fuel element 3 and part into the cavity between the
fuel elements and then into the branch pipes of the reactor housing.
Thermal deformation of the core is compensated by installing )he
pipe panel 4 on sylphon bellows 5.
Figure 2.13 shows a heterogeneous reactor on intermediate neutrons.
This reactor consists of a housing with branch pipes (1, 2, 3), a
core (4, 5, 6), regulating devices (7, 8, 9) and shield 10.
The liquid metal enters the reactor housing through branch pipe
2, passes through the core and exits from the reactor through branch
pipe 3. The core is made up of disks 4 with openings through which
the pipes pass which connect it with the pipe panels 5 and 6.
The reactor is
regulated by cylinders 7; emergency control is
accomplished by tilting reflectors 8 and the reflectors 8 are moved
by mechanism 9. The shield 10 is of multilayer construction. Shadow
shielding is used; therefore, the outlines of the reactor must be
inscribed in it.
Figure 2.14 illustrates a reactor of the "Romashka" type, in
which heat transfer from the core is accomplished without a heattransfer
agent.
The reactor is cylindrical. The heat releasing elements 1 are
made in the form of plates of uranium dicarbide with 90% enrichment
by the uranium isotope U23. The core consisting of the fuel elements
and graphite plates 2 with a maximum temperature in the center of
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