Dose Estimation

DOE-STD -3009-94

Appendix A

identification as described in section 3.3.2.1 of this standard, and should

represent documented maxima for a given process or activity. Such

documentation may be present in TSRs or lower-tier documents referenced in

TSRs, as necessary. While DOESTD-1027 excludes material in qualified

containers from consideration for the purposes of hazard classification, the

existence of such material should be acknowledged in a DSA. Such material

should later be excluded from the source term for the applicable accident

scenarios if the containers can be shown to perform their functions under the

accident environments. Exclusion of MAR from the source term may be based

on qualified containers (which may then be designated as SC design features),

consideration regarding the specifics of the accident scenario through the

definition of the damage ratio (defined below), or other appropriate means.

DAMAGE RATIO (DR). The DR is that fraction of material actually

impacted by the accident generating conditions. DOE-HDBK-3010 notes that

some degree of ambiguity can result from overlapping definitions of MAR and

DR in various applications. One consistent definition should be used

throughout a given DSA.

AIRBORNE RELEASE FRACTIONS (ARFs) AND RESPIRABLE

FRACTIONS (RFs). Bounding estimates for radionuclide ARFs and RFs for

a wide variety of MAR and release phenomena are systematically presented in

DOE-HDBK-3010. In those cases where there may be significant direct shine

contribution to dose, that contribution should be evaluated without the use of

the respirable fraction.

LEAKPATH FACTOR (LPF). The LPF is the fraction of material passing

through some confinement deposition or filtration mechanism. Several LPFs

may be associated with a specific accident, e.g., fraction passing from a

glovebox, fraction passing from a room, fraction passing through filtration vis-

-vis door leakage. For the purposes of the unmitigated release calculation, the

LPF should be set to unity.

A.3.3 Dose Estimation

The relevant factors for dose estimation are recepto r location, meteorological

dispersion, and dose conversion values. Specific guidance for each is provided

below.

DOSE CALCULATION LOCATION. For the purposes of comparison to

the EG, the comparison point is take to be the location of a theoretical MOI

standing at the site boundary. This location can also be beyond the DOE site

boundary if a buoyant or elevated plume is not at ground level at the DOE site

boundary. In such cases, the calculation location is taken at the point of

maximum exposure, typically where the plume reaches the ground level. It is

DOE practice and expectation that onsite individuals, both workers and public,

are protected under the Emergency Response plans and capabilities of its sites.

This protection, along with implementation of defense- in-depth and worker

safety philosophy, Safety Significant (SS) (and indirectly, through SC) SSC

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