Special System Guidelines

DOE-STD-1066-99

14.9 Special System Guidelines

14.9.1

Water Drains

14.9.1.1

Water drains with traps and a means to eliminate drain trap evaporation

should be provided in plenum floors to provide liquid run off control.

14.9.1.2

Plenum drains should be piped to either a process waste system or to

collection tanks.

14.9.1.3

Process waste systems and collections tanks should be of sufficient

capacity to capture all liquid from the water deluge spray systems for the

densities and durations required herein.

14.9.1.4

Criticality safety should be observed in all drainage and storage systems

where the potential for impacting fissile materials is encountered.

14.9.2

Limited Water Supply Systems

14.9.2.1

Limited water supply systems for the deluge water supply should be

permitted when a documented criticality potential exists in the final filter

plenum.

14.9.2.2

A documented criticality potential should be provided showing criticality

calculations and the total amount of water allowed in the plenum enclosure

before a limited water supply system is permitted.

14.9.2.3

Limited water supply can be accomplished by either limited capacity water

tanks or system water flow control valves.

14.9.3

Maximum Air Temperatures

14.9.3.1

When normal operating temperatures of final filter enclosure are expected

to exceed 200 oF (94 oC) or when operating temperatures of the final filter

enclosure exceed the manufacturer's limited continuous service

temperature rating, a method should be provided to cool the ventilation air

stream (for filter operating temperatures see Appendix B).

14.9.3.2

Normal operating temperatures do not include high temperatures

associated with fire conditions.

14.9.3.3

High operating temperatures in the final filter enclosure can be minimized

by long runs of ducts preceding the final filter enclosure, by intake of

dilution air from streams from other spaces, or by water cooling systems

inside the ducts.