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Safety Policies and Controls - hdbk1113cn10102
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Radiological Safety Training for Uranium Facilities - index
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Criticality Monitoring Techniques - hdbk1113cn10104


DOE-HDBK-1113-98
Module 105 Criticality Safety
Lesson Plan
Instructor's Notes
- using materials known as poisons to absorb
neutrons and prevent them from being
absorbed by the uranium atoms,
- controlling material that surrounds containers
or systems containing uranium, and
- controlling uranium inventories.
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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