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6 DESIGN FEATURES
The purpose of this section is to list passive DESIGN FEATURES important to safety in
the BUILDING 991 COMPLEX. DESIGN FEATURES are passive features that reduce the
frequency andor mitigate the consequences of uncontrolled releases of radioactive or other
hazardous materials from the facility to protect the health and safety of the public, collocated
workers, or immediate workers. Passive features credited in the accident analyses are discussed
in Table 3. Configuration management of DESIGN FEATURES important for safety are
addressed in Chapter 3, Safeg Management Programs, of the FSAR.
Building Structure / Internal
firebanier(fireratedwailand
firedoorsseparatingoffice
area from Room 134)
Table 3 BUILDING 991 COMPLEX DESIGN FEATURES
Metal Waste I The metal waste containers and drums used for the storage of radioactive waste
ContaineIdDmms*
are required to meet on-site transportation requirements. These containers are
relied on in the analysis to: (1) not be breached by falls of less than four feet;
(2)resist breaching due to material handling equipment impacts; (3)resisl
breaches from forklift tine impacts; (4)retain container lid due to intemal
overpressure from exposure to expected fires; (5)not propagate fires from
container to container when exposed to fires; and (6) Survive external explosion
peak overpressure of less than 22 pounds per square inch gauge (psig) (55-gallon
drums). These containers are also expected to provide resistance to breaching
from structural failures of the building - during natural phenomena hazards and
extemal events ("/EE).
Pipe Overpack Containers* The POCs are required to meet on-site transportation requirements. The POCs
are relied upon &the analysis to: (1) not bebreached by falls from any heights
expected during normal operations; (2)not be breached by material handling
equipment impacts; (3) resist breaches by structural member impacts; (4) not be
breached by external flammable gas explosions; (5)resist breaches by forklift
tine impacts; (6) not be breached by intemal hydrogen explosions; and (7) not be
breached by extemal fires expected during operations other than by direct torch
flame impingement. The POCs are also expected to provide resistance to
breaching from structural failures of the building during ~t~~al phenomena
hazards &d external events ("WEE).
T'ypeBShippingContainers* The SNM TypeB shipping container is required to meet TypeB shipping
Revision 1. A-I34
Septcmher 1.999
impingement.
The fire barrier, wall and fire doors, that separates the Building 991 office area
from the waste storage area (Room 134) was credited with eliminating the
potential of a large fire in the office area impacting waste containers in
Room 134. The credited portion of the fire barrier is the wall between the
Building 991 office area and Room 134, and the fire doors in the hallway
between the office area and Room 134.
Building 991 Complex FSAR I
Appendix A I