Aerodynamic Entrainment and Resuspension

DOE-HDBK-3010-94

5.0 Surface Contamination; Summary

Materials that do not undergo brittle fracture: airborne release by

shock-vibration.

Bounding

ARF 1E-3/RF 1.0

A erod yn am ic E n train m en t an d R esus pen sion

Bounded by ARR and RF postulated for aerodynamic entrainment of powders (section 4.4.4).

Indoors or outdoors exposed to ambient conditions (normal process facility

ventilation flow or less, or nominal atmospheric windspeeds < 2 m/s with

gusts up to 20 m/s) following an event:

Bounding

ARR 4E-5/hr; RF 1.0

Buried under debris exposed to ambient conditions or under static conditions

within the structure following an event:

Bounding

ARR 4E-6/hr; RF 1.0

Use of the values given above for short time frames (<100 hours) would not introduce

serious error due to the severe depletion of the source. For time periods exceeding

100 hours, the reduction of the source can be accounted for from the entrainment of

material. In general, these values are intended for immediate post-accident conditions and

freshly deposited material. They would overestimate releases from long-term contamination

(i.e., months to years) and are not appropriate for such use.

H E P A F ilters

T h erm al S tres s

Based upon conservative extrapolation of the maximum experimental measurement of release

of particles accumulated by the passage heated air through HEPA filters.

Bounding

ARF 1E-4/RF 1.0

E xp losive S tres s

The effect most closely resembling stresses in a given explosive-type accident scenario is

chosen. There is no need to assume cumulative releases for all effects cited.

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