closure project manager - Document Request - U.S. Department of ...

Vertical cracks in the lintel sections have been noted over all of the doorways in
Building 996. The concrete cracking in the lintels of the interior walls of Building 996 has been
attributed to shrinkage cracks resulting from the original mass concrete placement. The 12 foot
thick concrete slab over each lintel was determined to be capable of readily arching all loads
over these spans, eliminating structural capacity concerns due to the cracking (Ref. 17). In
August 1992 a review of the Agbabian calculations as well as additional checks, indicated that
Building 996 met existing conventional and natural phenomena load requirements (Ref. 18).
2.2.7 Corridor B
Corridor B, also known as Tunnel 996, is a reinforced concrete structure that connects
Building 991 north and west to Building 996 and to the east end of Corridor C. The corridor is
an inverted Y-shaped underground corridor 10 to 12 feet wide and 11 to 13 feet high.
Corridor B, between Building 991 and Building 996, is secured to Building 991 but the
connection at Building 996 allows motion of the corridor relative to Building 996 along the
corridor axis. Since the corridor, Building 996, and the northern portion of Building 991 are
below grade, they will move with the ground during an earthquake and therefore differential
displacement between Building 991 and Building 996 transverse to Corridor B is not expected to
be large enough to cause any damage to the tunnel or either building. Differential displacement
between Building 991 and Building 996 along the corridor axis would be minimized by soil
e
friction and again no damage to the corridor is envisioned. Corridor B, being underground, is
not subject to tornado or winds loading, or impact from tomado-driven missiles. (Ref. 15).
2.2.8 Building 998
0
Building998 consists of a vault-like structure (Room300) and a corridor connecting
Building 991 to Room 300. The corridor is referred to as either Corridor A or Tunnel 998.
Room 300 is located north of Building 991 and connected to it by Corridor A. The room
has exterior dimensions of approximately 30 feet by 20 feet with two feet six inch thick
reinforced concrete walls, floor, and roof. The earth cover over Room 300 is up to 14 feet in
depth. Room 300 was found to be capable of withstanding the criterion seismic loading of
0.14 g horizontal acceleration at bedrock level. The room, being underground, is not subject to
tornado or wind loading, or impact from tornado-driven missiles. (Ref. 15).
Corridor A, also known as Tunnel 998, is an underground, reinforced concrete structure
connecting Room 300 to Building 991. The tunnel is seven feet six inches wide and 180 feet
long. The walls, roof and floor of the tunnel are 15 inches thick. The earth cover is estimated at
a maximum of 18 feet.
Corridor A is keyed to both Room 300 and Building 991. Since Room 300, the corridor,
and the northern part of Building 991 are below grade, they will move with the ground during an
earthquake and therefore differential displacement between the two buildings transverse to the
corridor is not expected to be large enough to cause any damage to the corridor or either
Revision 1
Building 99 1 Complex FSAR
Seplcmbcr 1939 I
-