OP
TOT
NUCLEAR FUEL
The pressurized
water
nuclear
'burns'
uranium
power
station
dioxide. The uranium dioxide is made
Nuclear Fuel Assembly
into small round pellets,
which are
encased in zirconium alloy cladding
cobweb structure-
control rod
spring-
and sealed by welding,
forming long,
upper pipe bed
thin, individual
fuel rods.
These
upper lattice
fuel rods are fixed in a lattice,
to
guide pipe
form
the
assembly. fuel
Currently fuel rod
mixing
large pressurized water nuclear power lattice
stations use a 17 x 17 array in their
fuel assemblies.
Nuclear Fuel Pellets
Fuel Rod hermetic
weld.
upper- end plug
spring-
aluminium oxidet
thermal separator.
uranium oxide
fuel pellet
zirconium
cladding
lower lattice
lower pipe bed lower
end plug
גנועומק.
The
900 megawatt power
station
generally has 157 fuel assemblies with
about
Diagram of Reactor Core Array
80 tonnes of uranium
dioxide.
The fuel
elements
loaded
initially are of
three
different
densities,
containing
1.8-2.1%,
2.4-2.6% and 2.9-3.2% of uranium-235, each of
which accounts for about one third
of the
total. About one third of the fuel is changed
each year. The replacement elements have
density of between 3.1 -3.4%.
a
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