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DOE-HDBK-1113-98
Module 102 The Nuclear Fuel Cycle
Lesson Plan
Instructor's Notes
Highly enriched uranium was then named
"Oralloy" for "Oak Ridge Alloy," sometimes
abbreviated to "Oy." Depleted uranium was once
called depletalloy, but more commonly was called
"D-38" since it consists mostly of  238U. These
historical names are sometimes still used within the
DOE complex.
4.
Fabrication
The last step in the nuclear fuel cycle is changing
the enriched uranium into an appropriate form for
fabrication. The fabrication process differs
depending on the application. For fabrication of
fuel elements, the process generally includes the
following steps.
Uranium dioxide (UO2) is produced by
a.
reacting UF6 with water and then with a
hydroxide salt.
b.
The resulting precipitate is dried to form
"orange oxide," which is reduced with
hydrogen to form UO2 powder.
The UO2 powder is compacted into
c.
cylindrical pellets that are loaded into thin-
walled tubes made of either stainless steel
or an alloy of zirconium called "zircalloy."
27


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