Currently Skimming:
Letter Report
Letter Report
Pages 1-18
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From page 1... ...
Smith: May ~ I, 2000 As you are aware, the Centers for Disease Control =d Prevention (CDC) asked the National Research Council's Committee on the Assessment of CDC's Radiation Studies to review and comment on the Draft Final Report titled "Source Term Calculation and ingestion Pathway Data Retneval Evaluation of Matenals Released Mom the Savannah River Site".
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From page 2... ...
in Augusta, Georgia, after a visit to the Savannah River Site (SRS) on the afternoon of March 30, 1999, the committee was further charged with reviewing and commenting on 7J "The Community Executive Summary prepared" by CDC and RAC for public informational purposes ".
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From page 3... ...
For carcinogenesis, they used the EPA slope factors, which are generally based on a linear extrapolation from the upper confidence bound on the data-based estimate of nsk. The committee notes, however, that for the chemical source terms the results are scattered throughout chapters ~ 7 and ~ ~ and that as a result of this scattering it Is difficult to fonn a unified picture of the relative magnitude of releases of venous chemicals.
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From page 4... ...
a) The NCRP method should be described briefly.
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Why does the concentration decrease as the wind frequency increases? The total quantity of material going over a specific spot increases as wind frequency increases, but how does frequency affect concentration?
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For example, if the national average was not used for sulfur in coal, why should it be used for mercury in coal? In summary, the committee cautions RAC and CDC that careful attention be given to evaluating the chemical source terms.
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From page 7... ...
Figures 4.4-5 and 4.4-6 give more detail about the area where these releases occurred. Sampling line losses, a likely outcome given the long sampling lines connecting the sampling probes and filter connectors, are discussed in the report as are possible impacts of venous types of filter paper and sampling velocities.
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From page 8... ...
Both for consistency and as an aid to readers, a similar summary should be added to Section 4.4. Because the factors of conservatism used in the NCRP screening might not be uniform?
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From page 9... ...
Thus, the basic data on which source terms were estimated could be better for potential chemical releases than for radionuclide releases, but this requires demonstration. It should be noted, however, that for the chemical source teens the results are scattered throughout chapters 17 and is, and it is difficult to form a unified picture of the relative magnitude of releases of venous chemicals.
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From page 10... ...
The RAC effort to compile and assess all useful environmental monitoring data is descnbed in chapters S-14 of the Draft Final Report. The data included both published summary reports and raw data (read from handwntten ledgers preserved on microfiIm)
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From page 11... ...
As noted above, however, probably the most important iodine releases took place in 1956, before the milk-monitonng program began. Raw data by location are available ordy through 1973, after which only published annual summaries by sampling location were found.
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From page 12... ...
Surfacewater sources for these communities are at least 40 miles from SRS, and it appears unlikely that SRS has made a significant contribution of tritium to the drinking water, although increased levels have occasionally been detected. In contrast, Snaking water taken from the Savannah River downstream of SRS (at Savannah and Beautort)
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From page 13... ...
In some cases these data virtually rule out the existence of exposure contnbut~ons Tom the SKY, e.g., Cs-137 Tom either agricultural products or game. In other cases (tritium in drinking water taken from the Savannah River, contribution of radionuclides Cs-137 from fish, I-131 from milk especially in 1956)
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From page 14... ...
Releases to surface water might have much greater political importance than releases to air because of the concern with the Savannah River. The soluble or possibly soluble radionuclides in groundwater are Cs-137, Sr-90, I-13l, Co-60, P-32, and Zn-65.
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From page 15... ...
For example, the figure related to I-131 release estimates in curies per year uses a log-scale plot, instead of a linear plot which would have made the distinction between elemental and organic iodine clearer. Obviously missing from the community executive summary is any discussion of how the tntium or iodine releases would pose a risk to human or animal populations.
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From page 16... ...
If not, summarize the main points here. The committee recommends that CDC and RAC reexamine the community executive summary in the light of the recent study on stakeholders' risk perception at SRS, published in the December 1999 issue of Risk Analysis ("Risk Perception in Context: The Savannah River Site Stakeholder Study", by Bryan L
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From page 17... ...
In addition to the obvious scientific value of such information, the availability of much of the underlying data should provide further confidence to the public that a thorough job of mining and analyzing the data was done by RAG and associates. Finally, we append to this report some editorial comments that should be helpful in the preparation of the final report.
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From page 18... ...
Editorial Comments: p.
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