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BASES
APPLICATION
TO SAFETY
ANALYSTS
{continued)
Revision I
Saptcrnber 1999
The faciiitv flammable gas edosion dominant accident scenario nrzsents low risk
to the public and the collocated workers but high risk to thc immcdiate worhcr
The FEVS does not mitigate accident conseauences for thc immediate workcr
Therefore, thc dominant s~enario risk aspects of the facilitv flammable gas
exulosion cannot be mi tigated bv the FEVS.
The radiological dose mnseauences of fire scenarios (other than those that occur
at the dock during shiminP or receivina) can be mitigated by the FEVS Dunng
the conduct of the ShiuDhg and receiving activities, the Room 170 dock doors are
open and the system is not credited for Room 147 or Roorn 170 accident
mitigation. However. the likelihood of fires occuninn in Room 147 or Room 170
during conduct of these activities is small comDared to the likelihood of fires
occurring during maintenance activities or durinv general, uiiatteiided waste
container stome. This low fire likelihood is attributed to die cons~it personnel
artcndance during the conduct of the receiDt and ShiDment activities and the
absence of significant ignition sources in the Room 170 activities (use of electric
forklifts and handcarts). Therefore. the bounding buildino interior fires that are
evduated in the dew analysis are considered to be mitipated by die FEVS.
The nietal containers that are received bv the facilik for sowe or st3gin~ are
either Tipe A or Tv~e B shipDing containers. These containers are not vulnerable
to MIS of less than four feet or thim feet. resDectivelv. Therefore. the onlv mill
vulnerability of the containers rests with the Tme A containers that are lifted or
stacked above four feet (Le. third tier or hider). Stacking ouentions above the
second tier are not conducted while the dock doors are OD~II and the recehiiig and
shiming activities are not exroeded to raise the containers above four feet
Therefore. the building interior, normal operation spills that are evaluated in the
safetv analvsis are mitisated bv the FEVS.
Metal containers that are moved during operations are esroosed to a potential for
forklift tine ~unchins. These container ouncture scenarios can occur whiie the
dock doors are open during; receiDt and shipment operations or can occur while the
dock doors are closed during. other operzrtions. Metal waste containers that 3n'
moved during: orm-ations create a potential for container hvdrolren csulosions each
time the containers are touchod. As in the case of the punctu~-~ accident scenarios,
container hvdronen explosion scenarios can occur whiie the dock doors are owl
during receiot and shiDment operations or m occur while the dock doors arc
closed during other oDerations.
A-5 1 Building 991 Complex FSAR I
APpenaA I