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Section 1 Systems
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Design Considerations - index
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Primary Confinement System - hdbk1132990025


DOE-HDBK-1132-99
The specifics of confinement system design, as they relate to a particular
facility, should be guided by an iterative process between safety analyses and
design. Safety analyses define the functional requirements of the design, such
as the type and severity of accident conditions that the confinement system
must accommodate. The design should also consider sources of functional
design requirements including maintenance, operability, and process
requirements. This section discusses primary, secondary, and tertiary
confinement systems, design of confinement ventilation systems, and aspects
of confinement system design by nuclear facility type. The American Society of
Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) HVAC
Applications Handbook provides general information regarding heating,
ventilation, and air conditioning (HVAC) design for confinement systems.
General Considerations. Confinement system features, including confinement
1.1.2
barriers and associated ventilation systems, are used to maintain controlled,
continuous airflow from the environment into the confinement building, and then
from uncontaminated areas of the building to potentially contaminated areas,
and then to normally contaminated areas.
For a specific nuclear facility, the number and arrangement of confinement
barriers and their design features and characteristics are determined on a case-
by-case basis. Typical factors that affect confinement system design are the
type, quantity, form, and conditions for dispersing the hazardous material,
including the type and severity of potential accidents. In addition, alternative
process and facility design features may reduce potential hazards and the
resulting requirements for confinement system design. Engineering evaluations,
trade-offs, and experience are used to develop a practical design that achieves
confinement system objectives.
Because the number and arrangement of confinement systems required for a
specific nuclear facility design cannot be predicted, this discussion describes a
conservative confinement system design that uses the three principal
confinement systems described below. The discussion assumes that three
I-8


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