The Hanford Environmental Dose Reconstruction Project A Review of Four Documents (1994) / Chapter Skim
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VI. SUMMARY AND CONCLUSIONS
VI. SUMMARY AND CONCLUSIONS
Pages 30-36
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From page 30... ...
Different modeling methods are described for each pathway and depend on the available dose data, the degree of confidence justified by available data, and the level of sophistication deemed appropriate for the particular pathway and period being considered. The documents also cover the environmental accumulation and dose-assessment characteristics used to estimate the impacts of airborne releases of iodine-131 from the Hanford site.
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From page 31... ...
The release of 685 kCi of iodine-131 in 1944-1947 is the most important airborne source term. The operational measurements from the daily logs can be used reliably to determine iodine-131 inventories in the reactor fuel, and cooling times, power levels, and residual amounts are carefully considered.
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From page 32... ...
· Onsite groundwater pathways are not addressed; the committee recommends that this decision be discussed and justified. · The code DESCARTES itself, which is used to calculate the environmental concentrations of the radionuclides of interest, is not adequately described.
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From page 33... ...
However, biases that tend to increase the dose estimates have been accepted (for example, in the case of the chemical form to be considered) , triangular distributions have often been preferred to lognormal distributions, and obvious errors of a factor of 10 in the choice of some parameter values (for example, the deposition velocity or the immersion-dose rate factor)
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From page 34... ...
· Some areas in American Indian reservations are outside the current grid of major focus, and concern has been expressed for more information on the exposures and potential doses received by the American Indian communities. Americans Indians living in the area surrounding the Hanford site have been concerned about Hanford's impact on their historical lands and on the health of their people.
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From page 35... ...
Demographic and food-consumption data are to be collected and used as the basis for estimating preliminary iodine-131 doses for a range of life-style patterns characteristic of each of eight participating American Indian tribes. However, HEDR's effort that will go into modeling the aquatic pathways is not yet determined.
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From page 36... ...
The committee would like to see the final HEDR report before making a definitive judgment. Other specific comments and recommendations are in the appendix of this report.
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