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Facilitv Fire Scenarios
Revision 1
Scotcmber 1999
Facility Fire Scenario 1 - 1 MW TRU Waste Drum Facility Fire: This facility fire
involves the contents of 3 TRU waste drums located in either the Building 996, north or
south waste storage areas. This scenario is assigned an unZzkdy frequency in each of the
Building 991 Complex metal waste container storage areas. The facility fire is assumed
to pyrolize the combustible contents of the 3 drums (600 grams WGPu equivalent
potentially involved) and release the radioactive material through drum seals that fail due
to the fire. The facility fire is evaluated as occurring in Room 170 but could occur in the
other portions of the south waste storage area, the north waste storage areas, or in the
Building 996 waste storage area.
Facility Fire Scenario 2 - 2 MW TRU Waste Drum Facility Fire: This facility fire
involves the contents of 6 TRU waste drums located in the south waste storage areas.
This scenario bounds or envelopes other facility fire scenarios due to the assignment of
an extreme& unlike& frequency (same size fire in north waste storage area is a beyond
extreme& unZikeZy event and same size fire in Building 996 waste storage area is an order
of magnitude less likely to occur even thought its in the same frequency bin) or due to
the number of containers involved in the fire (same size fire in north waste storage area
has same frequency but involves fewer drums). The facility fire is assumed to pyrolize
the combustible contents of the 6 drums (1,200 grams WG Pu equivalent potentially
involved) and release the radioactive material through drum seals that fail due to the fire.
The facility fire is evaluated as occurring in Room 170 but could occur in the other
portions of the south waste storage area, the north waste storage areas, or in the
Building 996 waste storage area.
Facility Fire Scenario3 - Medium to Large Wooden LLW Crate Facility Fire:
This facility fire involves the contents of 4 wooden LLW crates located in the West Dock
Canopy waste storage area. This scenario does not bound or envelop any other facility
fire scenarios and has an assignment of an unZike& frequency. The facility fire is
assumed to ignite the combustible contents of the 4 crates (12 grams WG Pu equivalent
potentially involved) and directly release the radioactive material. The facility fire is
evaluated as occurring in the West Dock Canopy waste storage area.
Facility Fire Scenario 4 - Major Wooden LLW Crate Facility Fire: This facility
fire involves the contents of 50 wooden LLW crates located in the West Dock Canopy
waste storage mea. This scenario bounds another facility frre scenario due to the number
of containers involved in the fire (smaller fire of same frequency in the West Dock
Canopy waste storage area involves only 30crates) and has an assignment of an
extreme& unZike& frequency. The facility fire is assumed to ignite the combustible
contents of the 50 crates (150 grams WG Pu equivalent potentially involved) and directly
release the radioactive material. The facility fire is evaluated as occurring in the West
Dock Canopy waste storage area.
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Building 99 1 Complex FSAR
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