Exposure Evaluation

DOE-STD-3014-96

(Reference 7), which does a range of calculations and selects the worst

case. Alternatively, Reference 3 contains a simplified screening

approach.

7.2.4.3

Hazardous Material Onsite Exposure Determination. In the rare instance

when assessment of exposure to onsite personnel outside the facility is

desired (see discussion in Appendix A, Section A.1.2), the onsite

evaluation guideline, per Section 4.1, is that individuals should not be

exposed to a concentration in excess of ERPG-3 (or an equivalent

measure) at a distance of 300 m (984 ft) in Atmospheric Dispersion

Category D with a windspeed of 4.25m/s (14 ft/sec). Reference 3

contains a tabulation of release rates for various chemicals that will just

meet this criterion.

Other Methods. For both radioactive and chemical releases, other techniques may

7.2.5

be proposed and will be evaluated for sufficiency on a case-by-case basis by the

cognizant safety authority.

Comparison to Guidelines. The exposure to the maximally exposed individual at or

7.2.6

beyond the site boundary will be compared to the exposure screening guidelines.

If the exposure screening guidelines are met, no additional analysis of aircraft

impact is required. If the exposure screening guidelines cannot be met, a more

detailed analysis will be performed, based on both an assessment of the aircraft

impact frequency (Chapter 5) and an evaluation of the structural response of the

facility/operation subjected to aircraft impact (Chapter 6), in accordance with the

approach described in Chapter 3.

Exposure Evaluation. The purpose of exposure evaluation is to determine, based on the

7.3

specific level of damage and phenomenology associated with a spectrum of aircraft

crashes into the subject facility, the extent to which individual members of the public

and/or site workers may be exposed to a release of radioactive or hazardous chemical

material. This section provides an overview of the evaluation approach. Further details

are provided in Appendix D.