Uranium Conversion and Recovery Facilities

DOE-STD-1066-99

13.5.2 The process should have ventilation that provides sufficient air movement around the

process area to prevent exposure of personnel to the hazardous liquid or vapor. The

design should incorporate roughing filters and/or other types of traps to remove

entrained organic liquid droplets from the process off-gas before the off-gas enters

the main ventilation ducting to prevent ventilation ducts from becoming coated with

the organic material, and thus, creating a fire hazard.

13.6 Reprocessing Facilities

To ensure the maintenance of the principal confinement systems within secondary

confinement, design features should include provisions for fire sprinklers, water fog, or other

suitable fire protection systems. This will provide rapid heat removal, reducing both the

pressurization of the process cell or canyon and loading of the ventilation system filters with

13.7 Uranium Conversion and Recovery Facilities

13.7.1 To the extent practical, the primary confinement system should be constructed of fire-

resistant materials, and the process equipment and process being confined should

be designed to prevent or minimize the probability of potential flammable or explosive

conditions. Confinement enclosures for flammable metals should be designed with

self-contained fire protection and extinguishing equipment; in some cases, inert

atmospheres may be desirable within the enclosures.

13.7.2 Physical isolation barriers should be designed for process areas that use hydrogen.

Pressurized hydrogen gas storage areas should be surrounded with fire-resistant

barriers. The pressurized hydrogen storage tanks should be capable of being

isolated from the distribution system using positive shutoff valves. The distribution

system should either be double-walled piped (pipe within a pipe) or have hydrogen

detectors located at strategic points, with the detector- activated capability of shutting

off hydrogen flow at the source.

13.7.3 Fire-resistant, physical isolation barriers should be designed for both the fluorine gas

storage area and process areas that use fluorine.

14. NUCLEAR FILTER PLENUM FIRE PROTECTION

14.1 Purpose and Scope

14.1.1 Much of the information pertinent to fire protection for very high efficiency air cleaning

filter plenums for nuclear applications is contained in technical papers, limited

distribution reports, and job specifications that are often not readily available to DOE

designers, facility managers, and fire protection engineers. This section provides

personnel responsible for filter installations with practical fire protection guidelines for

nuclear air cleaning final filter plenums. Collectively, this section summarizes findings

from technical papers and job specifications currently used at DOE sites and

information obtained from filter manufacturers to provide the user with the "best"

methods and state of the art fire protection for protection of exhaust plenum final filter

installations.