Tertiary Confinement System

DOE-HDBK-1132-99

measures to provide negative operating pressure in the secondary

confinement with respect to the tertiary confinement, especially where

variable flow primary confinement exhaust systems (fume hoods) are

utilized.

Tertiary Confinement System . The tertiary confinement system typically is the

exterior laboratory building and its associated ventilation system. It is an area

that is not contaminated and houses offices and other clean laboratory facilities.

The following design features should be incorporated into tertiary confinement

systems for laboratory facilities:

the use of a ventilation system separate from the primary confinement

ventilation system with appropriate air-cleaning capabilities (e.g., HEPA

filtration, radioiodine absorbers, scrubbers) and

measures to maintain operating pressure in the tertiary confinement

negative with respect to the atmosphere.

The secondary and tertiary confinement ventilation systems may be shared if

safety analysis indicates that this type of design is acceptable.

1.3

EFFLUENT CONTROL AND RADIATION PROTECTION

Introduction and Scope . This section addresses aspects of facility design

1.3.1

specifically intended to provide for effluent control and radiation worker

protection. Included are shielding, radiation monitoring systems, contamination

control, and effluent monitoring. This treatment is not exhaustive; many lessons

learned in design have been translated into regulations, Orders, and guidance

documents, especially 10 CFR 835, Occupational Radiation Protection; the

DOE RADIATION CONTROL MANUAL; and DOE O 420.1 and its guidance

documents.

Design of nuclear facilities should minimize personnel exposures to external and

internal radiological hazards, provide adequate radiation monitoring and alarm

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