Exposure Screening Guidelines

DOE-STD-3014-96

APPENDIX A

Scope. Chapter 4 presents the numerical screening and evaluation guidelines used in this

standard to determine at what stage in the approach the analysis of aircraft crash is sufficient.

This appendix presents the basis for the selection of these guidelines.

Exposure Screening Guidelines. Protecting the health and safety of the public is a

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primary concern when considering the risk from releases of hazardous material resulting

from aircraft crash. This standard establishes three screening criteria for determining

whether a particular facility poses a potential threat to the public. These criteria set

exposure levels below which there are unlikely to be any significant health effects, even

to the maximally exposed individual in the offsite population. Each of these criteria is

listed below, along with the basis for its selection. Note that the criteria reflect a

consistent approach toward the selection of radiological and chemical exposure

guidelines, as opposed to an attempt to provide directly comparable guidelines. It would

be ideal if there were total consistency between the guidelines for radioactive exposures

and chemical exposures. However, given that chemicals act in different ways upon the

human body, and given that regulation of hazardous chemicals and radioactive materials

has historically never sought consistency (and given the desire to make as much use as

possible of already established regulatory precedents), it is too much to expect that total

consistency could be achieved here.

A.1.1 Exposure Screening Guidelines for Exposures Evaluated at the Site Boundary.

Radiological exposure - 25 rem (0.25 sievert [Sv]) committed effective

dose equivalent (CEDE).

Basis: First, note the distinction between committed effective dose

equivalent (CEDE) and total effective dose equivalent (TEDE). The

former is the accumulated dose over 50 years following inhalation or

ingestion of radionuclides. The latter includes, in addition, the dose

resulting from external irradiation.

A TEDE of 25 rem (0.25 Sv) at the site boundary has precedent as a

siting criterion, referenced in DOE Order 6430.1A, General Design

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