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Source Term Calculation
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Atmospheric Dispersion - doe-std-3009-94_cn3_3-30-060140


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
Page A-6


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