PU R P O S E . The purpose of this DSA chapter is to provide information necessary
to support the safety basis requirements of 10 CFR 830.
This chapter provides a description of site characteristics necessary for understanding the
facility environs important to the safety basis. Information is provided to support and
clarify assumptions used in the hazard and accident analyses to identify and analyze
potential external and natural event accident initiators and accident consequences external
to the facility. Expected products of this chapter, as applicable based on the graded
Description of the location of the site, location of the facility within the site, its
proximity to the public and to other facilities, and identification of the point where
the Evaluation Guideline is applied.
Specification of population sheltering, population location and density, and other
aspects of the surrounding area to the site that relate to assessment of the
protection of the health and safety of the public.
Determination of the historical basis for site characteristics in meteorology,
hydrology, geology, seismology, volcanology, and other natural events to the
extent needed for hazard and accident analyses.
Identification of design basis natural events.
Identification of sources of external accidents, such as nearby airports, railroads,
or utilities such as natural gas lines.
Identification of nearby facilities impacting, or impacted by, the facility under
Validation of site characteristic assumptions common to safety analysis that were
used in prior environmental analyses and impact statements, or of the need to
revise and update such assumptions used in facility environmental impact
Existing supporting documentation is to be referenced. Include brief abstracts of
referenced documentation with enough of the salient facts to provide an understanding of
the refe renced documentation and its relation to this chapter.