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

3.M. LIMITENG CONDITIONS FOR OPER.ATI03 AND S'C;RVEIXALANCE
REUUI-REMENTS
3.3!4.3 BUILDING 991 COMPLEX AUTOMATIC PLENUM DELUGE SYSTEMS
BASES
BACKGROUKD The BULDING 991 COMPLEX liandles arid stores low-level waste (LLW and
TFG was containers (including uiue ovemack containers (POCs)) of various
tmes. All POC containers arc packaeed in robust metal containers that are not
suscmtible to fin damage. Ail of the other waste ConLahiers inside the buildings
are metal dnims or metal crates. Wooden LLW ctatcs are uernlitted to be stored
outside of the buildings in areas covered bv the Automatic Sprinkler Svstem. The
BUILDING 99'1 COMPLEX also handles and stwes Twe €3 shipaincr containers
holding. SNM for off-site shipment. All SNM containers m packwcd in robust
metal containers that arc not susceDtibk to fire darnme.
Revision 1
September 1993
Tha combustible loading irr the interior iriastt: container storax areas of the
BUILDING 991 COMPLEX is minimal. consk&w of dm-wotectinn dvwood
sheets benvecn dnun tops and metal pallets in stacked drum confinurbions,
crate-urotectino ~Iastic covers between stacked metal crates, and limited transicnt
combustible materials. Wooden pallets are not permitted to be -sed for waste
container storaee in the BUILDING 991 COMPLEX. Exterior wasre container
storare mas of the BUILDING991 COMPLEX Dotentiallv have a higher
combus3ible loadinrr (e.??.. emutv wooden des. wooden LLW crates).
Fires impacting waste containers werc cvaiuated in the FSAR Safetc. Analwis.
The and\& evaluated fires initiating in the interior waste container storage areas.
the exterior wooden LLW crate storaee ares, and the office areas which an
contiguous to waste container storage areas. Tlie Autoinatic Pleirum Deluge
Svstems arovide DEFENSE-IN-DEPTH urotection of the filters in the Filtered
Exhaust Ventilation Systems from ignition and burning as a result of larger than
aialvzcd facilit7: h s that occur in ventilated areas.
The Buildinc 99 1 Filtered Exhaust Ventilation Svstem consists of a sin& stare of
HEPA filters. A pfenum deluge svstenl inside the aienum consists of thrce
~rimm subsystems: 1) an automatic dehm svstenr located upstream of the
plenum demister screen that is actuated bv anv of the pftnum heat detectors
repisenna 190°F; 3 a denlister screen located upstream of the HEPA filter stwe,
and 3) a manual defuge mscem located after the demister screen but before the
HEPA filter stw c. The build in^ 985 Filtered Exhaust Venaation System
consists of mo stages of HEPA filters and the plenum contains equivalent
subsvstems to the Building 991 plenum.
A-65
Buildins 99 1 Complex FSAR
Appendix A
I