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effectively shielded and does not require a lightning protection system. Lightning protection for
the Buildings 996,997, 998 and 999 is not required since these structures are underground.
2.3.7 Building Drain System
Drains are located on the roof of Building 991 to drain water from the roof. The drains
flow directly into the sanitary waste system.
Sanitary drains are located throughout Building 991 and drain directly into the sanitary
waste system as discussed in Section 2.3.5.3.
2.3.7.1 Filter Plenum Drain Systems
The Building 985 plenum is supplied with a fire water holding tank to catch water from
operation of the plenum deluge system. The fire water holding tank is located in a pit at the east
end of Building 985. The tank is designed to collect the drains from the exhaust plenum in the
event the plenum fire sprinklers are activated. If water is introduced into this tank, Waste
Management is contacted for assistance in the disposal of the water. The system has a
recirculating system for sampling the water and a pump that discharges to a hose connection by
the east door of the building. By utilizing the pump and hose connection the contents could be
transferred to a mobile tank by hose and transported to a disposal site. The fire water holding
tank does not contain Raschig rings. In addition to the plenum drains, a sump pump in the fire
water holding tank also discharges to the tank.
The Building 991 roof plenum has no fire water holding tank. Water from the plenum
deluge system drains from a drain located in the plenum directly into the sanitary waste system.
2.3.8 Confinement Systems
The primary means of codhement in the Building991 Complex are the shipping
packages. The secondary me& of confinement is provided by the concrete construction of the
Building991 Complex. Since operations with unconfined materials are not allowed in the
Building 991 Complex (Le., waste containers are not opened in the complex), other confinement
systems are not required.
Currently, material being moved or stored in the Building 991 Complex is in approved
on-site or off-site shipping packages. TRU waste, received from the PA is packaged in
55 gallon drums, DOT-7A Type A Metal Waste Boxes, or Transuranic Package Transporter 11
(TRUPACT II) Standard Waste Boxes (SWs).
One type of 55-gallon dnun received and stored by the facility is the pipe overpack
container (POC). The POC was designed to optimize shipments of high plutonium content TRU
waste from Rocky Flats Environmental Technology Site WETS) to the Waste Isolation Pilot
Plant (WIPP). The container was approved for use in the TRUPACT I1 shipping container by
the Nuclear Regulatory Commission in February 1997. The POC consists of a seded pipe
Revision 1
Wlildmg 991 Complex FSAR
Sepbnher 1999 I