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Smoke Detection System
Fire Phones
Fire extinguishers
Figures 2-6 through 2-9 provide an overview of the floor plan of the Building 991
Complex and show the general location of the automatic sprinkler system zones and locations of
the fire hydrants, post indicator valves (PIVs), fire extinguishers, Fire Department connections,
fire phones, inspector's test connections, fire alarms, and fire detection systems.
A description of the ftre suppression, detection and alarm system is provided below.
2.3.1.1 Fire Water Supply
The domestic cold water (DCW) system, as discussed in Section2.3.5.4, supplies the
water for the fire suppression systems for the Building 991 Complex. Major components of the
fire water supply consist of lines from the Site DCW supply system, PIVs, fire hydrants, Fire
Department connections, alarm check valves and distribution risers.
Two distribution risers support Building 991, including Building 998 (Room 300 and
Corridor A) and Building 989. These risers are designated as Systems A and B respectively.
The System A riser supports the wet pipe sprinkler system in Building 991 and a dry pipe system
valve from this riser feeds the dry-pipe sprinkler system for the East Dock and Building 989
This system also supports the plenum deluge system for the Building 991 roof plenum. The
System B riser supports the dry-pipe sprinkler system for the West Dock and the canopy area. A
third distribution riser supports Building 985. The fire suppression systems supported by each
fire water supply system are shown in Figures 2-6 through 2-9. For Riser System A and
Building 985 the water enters the building at the risers and passes through the alarm check valve
on its way to a retard chamber with a pressure-operated alarm switch and to the sprinkler system
piping. For Riser System B the water enters the building at the riser and, once the air pressure
has been reduced due to system activation, passes through to the sprinkler system piping. A PlV
at each line is normally locked in the open position but can be closed to isolate the supply line
Building 991 contains a horizontal standpipe system with eight 1-%-inch hose connections for
Fire Department use for System A. Hoses, racks, and nozzles have been removed from these
locations. There are no hose stations requiring support from System B. The Fire Department
connections for Systems A and B, located on the southwest corner of Building 991, consist of
Siamese (dual) 2-1/2-inch inlets that supply the sprinkler system or hose stations. The
connections are marked to indicate whether they supply sprinklers or hose stations. Check
valves keep water that is being pumped into the building hose station Fire Department
connections from charging the sprinkler system. The Building 985 Fire Department connections
are located on the south side of the building. A single connection is provided for the hose station
and a Siamese (dual) 2-1/2-inch inlet is provided for the sprinklers.
Revision 1
Scpicmber 1999
Building 991 Complex FShR