Exposure Screening

DOE-STD-3014-96

Data - Information that is specific to the facility being analyzed but is unlikely to

have already been compiled in other documents. Such information is generally

needed only for aircraft crash analysis and would therefore not be readily available

unless a previous analysis has been performed.

Derived - Information that results from the application of this standard. Generally,

a derived input was an output of one of the previous steps of the analysis.

Exposure Screening. Exposure screening consists of performing a simplified,

3.1

conservative analysis of the potential hazardous material exposure to any member of the

public resulting from an aircraft crash into a facility. For the purpose of this screening, it is

assumed that the building is destroyed and all of the hazardous material available in the

building is impacted; conservative values for the amount of material that can be

transported and ingested are used, and it is assumed that the most direct and harmful

path is taken to the site boundary. Exclusions of well-confined material from the

hazardous materials inventory may be made, but should be justified on the basis of the

robustness of the material containment in a postulated aircraft impact environment. The

purpose of this step is to determine whether there is sufficient hazardous material

inventory in the facility that the worst possible release could cause measurable harm to a

member of the public (or, in certain cases, to a worker near the facility). The guidelines

(given in Section 4.1) are expressed in terms of a dose (for radioactive materials) or a

concentration (for chemical hazards) to the maximally exposed individual at or beyond the

site boundary. The methodology for the analysis is provided in Section 7.2.

The result of the analysis allows the analyst to determine what amount of radioactive or

hazardous chemical material would have to be present in the facility to exceed the

guidelines at or beyond the site boundary (see Chapter 4). The analyst can then

determine whether the facility inventory would exceed those guidelines. If the facility

inventory does not exceed the thresholds, the risk is deemed to be small and the results

are documented. If the facility inventory does exceed the thresholds, the analysis should

proceed to the next step.