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Radiological Safety Trainign for Uranium Facilities
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Controlling Uranium Inventories - doe-hdbk-1113-98_reaffirm_2005_040157


DOE-HDBK-1113-98
Radiological Safety Training for Uranium Facilities
Module 105 - Criticality Safety
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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