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Guidelines For Preparing Criticality Safety Evaluations at Department of Energy Non-Reactor Nuclear Facilities
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Contingency 1b


DOE-STD-3007-93
Likewise, the elevation of the small volume trap (well above manually handled containers
near floor level) avoids the need to consider portable process containers in contact with the trap.
The trap is fabricated of standard 4" diameter x 36" tall Corning conical Pyrex glass. Based on
Corning vendor data1, the design outside diameter is 4 17/32" with a 17/64" wall, giving an inside
diameter of 4". The trap volume is thus only 7.4 liters. The trap base is elevated about 11' "
8
above the Room 1021 floor.
There is no ready means for operator access to the trap. There is no operational incentive
to have a process container in close proximity to the trap.
CONTINGENCIES
1.
Loss of geometry control
(a) Transfer line leak, valve leak, trap breakage, etc., near the west wall of Room 1021
(b) Leak in transfer line to D-Wing
(c) Overfill of D-Wing storage tanks, line leak, etc., in D-Wing
(d) Loss of liquid to the wet vacuum system
(e) Use of an improper container for solution drainage from the trap
ANALYSIS
Contingency 1a
Any fissile solution release from the process equipment along the west wall of
Room 1021 will result in a simple solution spill into a safe geometry slab.
The other analyses demonstrate that this diked area could retain the entire solution
inventory of the Room 1201 west wall solution process equipment without exceeding a solution
depth of 0.75". Room 1021 is identified as an unsafe container exclusion area; large, open
containers are prohibited without specific Criticality Safety approval. Posting is present regarding
this limitation.
1-7


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