Airborne Effluents

DOE-HDBK-1132-99

confirm that they can be heard in the ambient conditions of the area in which

they are placed. ANSI N2.3 provides guidance for the design of evacuation

alarm systems.

If a criticality excursion could potentially occur, including a potential for

personnel exposures, nuclear accident dosimeters should be installed. ANS

8.3, Criticality Accident Alarm System, provides guidance for criticality accident

alarms.

In addition to a local station alarm, radiation monitoring systems (i.e., criticality

alarms, CAMs, alarms associated with stack monitoring systems) should have

central (i.e., control room or radiation monitoring office) readout and alarm

panels that are accessible after an accident so that internal conditions can be

evaluated.

1.3.6

Airborne Effluents . For nonradioactive hazardous gaseous or airborne

effluents, the point of release is the point at which the effluent exits the stack,

vent, or other release points.

Exhaust ducts (or stacks) that may contain radioactive airborne effluents should

be provided with effluent monitoring systems. The monitoring capability should

cover the range from normal effluent concentrations to the maximum

concentration expected from a credible accidental release. For exhaust outlets

that may contain plutonium, uranium, enriched uranium, tritium, transuranics or

fission products, and other radioisotopes above ambient levels, two

independent monitoring systems should be considered.

Backup capability for monitoring systems should be considered in the design of

each system (e.g., redundant detectors, additional sample line ports, additional

sampler trains, etc.). Continuous stack sampling and continuous radiation

detection should also be considered. ANSI N13.1 provides guidance on

designing sampling systems that provide accurate, representative sampling of

effluent streams.

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