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DOE-HDBK-3010-94
Appendix B; Production Support Lab
3.1.5.3 F ire M itigation D esign an d P ractices
Whenever possible, construction materials are noncombustible or fire resistant. The exterior
walls and roof of the building have a minimum 2-hour fire rating while the concrete interior
walls and gypsum board over steel stud walls have minimum 2- and 1-hour fire ratings
respectively. Major structural components of the gloveboxes and process material are made
of noncombustible material.
Combustible liquids are not allowed in gloveboxes as part of the combustible loading control
program in effect, except for one 50-ml bottle of a hexone-based solvent used for sample
extractions. Potentially combustible wipes are limited by this program as well to
approximately six in line at any one time. In normal operation, non-installed combustibles in
the operating areas consist of desks, chairs, papers and books, electrical insulation, and
flammable liquid storage cabinets. The latter normally contain several liter bottles of a
hexone-based extraction solvent and/or several bottles of flammable chemicals such as ether,
as well as miscellaneous cleaning chemicals.
A reasonable amount of clutter, largely in the form of empty sample vials (glass or impact-
resistant plastic), tools, and glassware, can be found in analytical gloveboxes. However, the
major sources of combustible material in lab gloveboxes are electrical wiring, glovebox
gloves, sample label paper, and possibly sample vials if temperatures become hot enough.
Wiring is installed in accordance with codes and housed in conduits or sealed raceways.
Wiring penetrates gloveboxes through pave connectors to prevent an insulation fire from
progressing into gloveboxes. The glovebox gloves are made of materials such as Hypalon
and will melt and burn at elevated temperatures. However, the number of gloves is limited,
and storage of used gloves in a line after removal is forbidden by procedure.
3.1.5.4 F ire D etection an d A larm S ystem
The lab has three types of fire detectors available: ionization, photoelectric, and thermal. All
three are used in individual rooms, while only thermal detectors are used in gloveboxes and
ventilation plenums. Exceeding the setpoint on any detector will initiate an alarm in the
operating area, the facility control room, and the site fire department. Failure of a detector
and interruption of signal flowpath by such means as a wire break will initiate an alarm as
well.
3.1.5.5 F ire S u p p ression S ystem
All analytical areas of the lab are equipped with automatic wet-pipe sprinklers in the
overhead, which actuate at temperatures slightly higher (approximately 155 F) than the fire
Page B-88


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