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Volume - doe-hdbk-1113-98_reaffirm_2005_040099
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Radiological Safety Trainign for Uranium Facilities
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Controlling Uranium Inventories - doe-hdbk-1113-98_reaffirm_2005_040101


DOE-HDBK-1113-98
Module 105 Criticality Safety
Lesson Plan
Instructor's Notes
D.  Safety Policies and Controls
Achieving criticality involves bringing together many
factors that promote a sustained nuclear chain reaction.
To avoid criticality, one should be aware of the conditions
that would promote a criticality for the particular
materials they encounter, and avoid those conditions that
promote criticality.
1. General Criticality Safety Principles
Some things done to promote criticality safety
include:
analyzing work environments to assess the risk of
criticality and eliminate likely criticality concerns;
using carefully planned and approved procedures;
providing specific training for those personnel
working in areas where fissile materials are
present; and
implementing system design features that are
favorable to criticality safety. These features
include:
-  using containers with a size and geometry that
will not allow criticality,
-  designing piping systems to prevent buildup of
uranium and prevent criticality,
-  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.
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