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DOE-HDBK-3010-94
5.0 Surface Contamination; Summary
circumstances are bounded by suspension postulated for loose surface
contamination from shock/impact stresses (see subsection 5.2.3.2):
Bounding
ARF 1E-3/RF 1.0
For the situation where the combustible material is packaged in a relatively
robust container (e.g., hard pail, drum) that is opened or fails due to impact
with the floor or impaction by falling debris (shock-vibration induced by
impact), the bounding ARF and RF are based on reasoned judgment that
suspension under these circumstances will be bounded by suspension postulated
for debris impacting powders in cans (see subsection 4.4.3.3.2):
Bounding
ARF 1E-3/RF 0.1
A erod yn am ic E n train m en t an d R esus pen sion
No applicable data were found. The bounding ARRs and RFs quoted are based on reasoned
judgement that entrainment under these conditions would be bounded by suspension of
powders under similar circumstances (see 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.
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