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DOE-STD-3014-96
APPENDIX A
onsite guidelines are not needed. Thus, the analyst's obligation is to
justify why they should be used in a specific case, not why they are not
being used. In particular, it should be noted that, because of the
differences between the offsite and onsite guidelines and the way the
exposure calculations are performed, the onsite guidelines are totally
useless when the site boundary is within 300 m (984 ft) of the facility and
are very likely to be useless when the site boundary is within 1000 m
(3280 ft) of the facility.
A.1.3 Potential Contamination to the Environment Exposure Screening Guidelines.
The final topic considered in developing the exposure screening guidelines was
potential contamination of the environment. In most cases, it was felt that
exposure to the general public was a sufficient surrogate for offsite
environmental contamination. Similarly, if onsite contamination were an issue,
then exposure to onsite workers was considered a sufficient surrogate. Although
it was recognized that this may not always be the case, there was no obvious set
of accidental contamination guidelines readily available for incorporation into this
standard. This is in large part due to the fact that there are many different types
of environmental receptors (as opposed to only one, a human, for health and
safety), and these receptors vary in their sensitivity to different hazards. For this
reason, providing specific guidelines for environmental contamination was felt to
be impractical. As stated in Section 1.3, "Applicability," it is left to the analyst to
determine whether special conditions exist that would warrant a specific
evaluation of environmental impacts in those cases where such analysis is not
warranted by health and safety concerns. Again, the default position is that such
analyses are not needed, and the burden is on the analyst to justify their
inclusion.
Frequency Screening Guidelines. The DOE has issued a standard, DOE-STD-3009-94
A.2
(Reference 1), providing guidance for the preparation of Safety Analysis Reports (SARs).
This standard states that an external event should be analyzed as a design basis
accident (DBA) if its frequency of occurrence exceeds 1E-6/y conservatively estimated,
or 1E-7/y, realistically estimated. Aircraft crash impacts are human-caused external
A-6


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