Total Collapse

DOE-HDBK-3010-94

7.0 Application Examples; Production Support Lab Example

C. Total Collapse. The release phenomena for liquids in gloveboxes is again

considered to be bounded by free-fall spill. The ARF and RF for free-fall spill of

2 E-4 and 0.5 (section 3.2.3) for aqueous solutions is again arbitrarily selected.

The release phenomena for solids will vary by type. Metals will not experience any

significant release, and therefore all solids are considered to be powders. Although

these powders are contained inside glass vials and, in some cases, metal containers,

they are assumed to be loose powder for the sake of simplicity. The loose powder

experiences three release effects. The first is shock-vibration of clump powder, for

which the ARF and RF are 1E-3 and 0.1 (subsection 4.4.3.3.1). The second is free-

fall spill as the glovebox structure in the free-fall zone collapses. The ARF and RF

for this phenomena are 2E-3 and 0.6 (subsection 4.4.3.1). The final release

phenomena is air turbulence generated by the impact of debris. The bounding ARF

and RF for this phenomena are 1E-2 and 0.2 (subsection 4.4.3.3.2). The combined

cumulative ARF x RF value for all three phenomena is 2.7E-3. Waste pails are

assumed to experience surface contamination shock-impact, for which the ARF and

RF are 1E-3 and 1.0 (subsection 5.2.3.2).

The facility HEPA filter media is encased in the filter housing and loaded in a steel

plenum housing. Even if the plenum was on a second level of the collapsing facility,

this effect cannot be considered unenclosed HEPA filter media. Accordingly, the

ARF and RF of 5E-4 and 1.0 (subsection 5.4.4.1) for crush-impact of enclosed

HEPA filters is used.

For the sake of simplicity, the MARs are the maximum listed in Table C-2,

"Production Support Lab Facility Hazard Identification." The blast release effects

identified above are applied to all of the material in the lab rooms for a conservative

initial screen to estimate an initial source term of:

Liquid

560 g * 1.0 * 2E-4 * 0.5

= 0.06 g

Powder

550 g * 1.0 * 2.7E-3

= 1.5 g

Waste

140 g * 1.0 * 1E-3 * 1.0

= 0.1 g

Filters

18 g * 1.0 * 5E-4 * 1.0

= 9E-3 g

Total

1.7 g

Following the initial release, resuspension releases are evaluated as well. The

bounding resuspension rate assessed for liquids covered with debris is 4E-8/hr

(subsection 3.2.4.5) and 4E-6/hr for powders covered by debris (subsection

4.4.4.1.2). No resuspension is assumed from HEPA filter media. If all of the waste

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