scope:

This standard covers requirements for the design, construction, and testing of the units and components which make up Engineered Safety Feature (ESF) and other high efficiency air and gas cleaning systems used in nuclear power plants.

Limitations

The standard does not cover functional design or sizing of a complete air cleaning system, redundancy or single-failure requirements, or the integration of individual air-cleaning units to comprise a complete air-cleaning system. It applies only to systems which employ particulate fdtration, ambient-temperature adsorption, or both, as the principal functional mechanism. It does not apply to condenser off-gas systems. Also, it does not apply to other applications which employ primarily gas storage or holdup, cryogenic adsorption or fractionation, or solvent absorption as the principal method of gas treatment. Nor does the standard cover requirements for containment isolation valves, recombiners, comfort heating, air conditioning, or ventilation to achieve ordinary cooling or industrial hygiene objectives.

Purpose

The standard identifies and establishes minimum requirements for filters, adsorbers, moisture separators, air heaters, filter housings, dampers, valves, fans, ducts, and other components of air-cleaning systems for a specific application in a nuclear power plant. The standard also establishes requirements for operability, maintainability, and testability of systems necessary for the maintenance of system reliability for the maximum design condition. Testing provisions are specified to verify the adequacy of the unit and component design, to verify that components have been properly fabricated and installed, and that the system will perform in accordance with specification requirements.