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DOE-HDBK-1113-98
Module 105 Criticality Safety
Lesson Plan
Instructor's Notes
2. Controlling Uranium Inventories
One method to prevent a criticality is controlling
uranium inventories. Inventory control involves
knowing where the uranium is at the facility and the
level of enrichment of the uranium. Uranium enriched
in 235U or the presence of 233U is of concern for
criticality; therefore, these are materials of concern for
inventory control. Criticality is a concern for 238U if
fast neutrons are present.
Loss of control of fissile material presents a threat to
criticality safety at the facility and, in a worst case
scenario, to national security. It is no secret that
groups throughout the world are striving to become
nuclear powers. Even the appearance of a loss of
inventory control must be avoided to keep the public
trust and assure continued operations of DOE
programs. For these reasons, inventories of fissile
material are closely monitored.
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