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

uilding. Differential displacement between the two buildings along the corridor axis would be
minimized by soil friction and again no damage to the corridor or buildings is envisioned.
Corridor A, being underground, is not subject to tornado or winds loading, or impact from
tornado-driven missiles. (Ref. 15).
A structural evaluation (Ref. 21) of Building 998 was performed to assess the structural
integrity of Room 300 and Corridor A due to the depth of overburden soil load. The evaluation
consisted of a review of the structural drawings and inspection of the Room 300 and corridor
structures. The inspection of Room300 revealed that the concrete walls are in very good
condition. No signs of any structural stress was noted during the inspection. The inspection of
CorridorA indicated that the concrete walls are in very good condition. There were no
appearance of any structural overstress cracks. The only problem noted with Corridor A was the
hair line transverse cracks in the ceiling and walls at about the center of the length of the
corridor. These cracks are near the transverse construction joint that has a rubber membrane to
keep water from leaking through. Both the cracks and construction joint have leaked in the past.
The evaluation concluded that since the condition of Room 300 and Corridor A is good with the
present loads, and since no additional loads are planned, it is justifiable to certify the these areas
as structurally safe. (Ref. 21).
2.2.9 Building 985
Building 985 is a 2,400 square foot filter plenum facility, constructed in 1972. It is a
one-story structure adjacent to the northwest corner of Building 991. At the east end of the
building is a pit in which there is a tank for collecting water that would result from activation of
the plenum fire protection sprays. There are no Raschig rings in the tank.
Building 985 is approximately 60 feet long by 40 feet wide by 15 feet high. The
foundation of the building consists of 16 concrete caissons with two foot, 2% foot, and 3 foot
diameters and lengths varying from 13 feet to 34 feet. The caissons support reinforced concrete
grade beams 12 inches thick and five feet deep for interior walls and five feet three inches deep
for exterior walls. The floor slab is reinforced concrete eight inches thick on ground, nominally
1 1 inches thick for pads, and an average 12 inches thick for the sloping pit slab.
The pit walls are 12-inch thick reinforced concrete with an average height of 13 feet.
The exterior walls of the building are pre-cast concrete, six inches thick. Pre-cast concrete walls
are over 13 feet high. Cast-in-place straight wall and corner wall connections and continuous
perimeter concrete roof beams bond the walls together.
The main roof is precut concrete, twin tee construction with a two inch thick wire mesh
reinforced concrete topping, 1% inch thick insulation, and built-up roofing. The airlock roofs
are cast-in-place concrete.
Structural framing is poor due to excessive ground erosion at the west end and south side
of the building. The entryway and walkway is sinking and pulling away from the building
(Ref. 5). This condition has no effect on the function of the filter plenum system. The drainage
Revision I 2-16 Building 99 1 Complex FSAR
September 1999
I
-