THE MODELLING OF NATURAL PROCESSES - A PROBABILISTIC APPROACH IN THE ASSESSMENT OF RADIONUCLIDE TRANSFER IN THE GEOSPHERE AND BIOSPHERE
The question arises as to what level of sophistication of chemical data will finally be regarded as sufficient for safety assessment analyses. In view of the difficulties in obtaining most of the data and the quantity that will be required to completely define the various environmental systems considered, a practical approach needs to be developed. The development and application of probabilistic assessment models, which use input data in terms of parameter distributions, is part of the approach being followed by the CEC Joint Research Centre Ispra. In the present paper a preliminary uncertainty sensitivity analysis has been performed on a probabilistic radiological assessment code applied to the sub-seabed high level radioactive waste disposal option. The principal aim of this study was to compare the effect of the uncertainties admitted for the geospheric and biospheric sub-system and to identify the dominant sub-systems of the code as a whole. The results show that the geospheric sub-system uncertainties dominate. This is probably related to the molecular diffusivities and retention coefficients which have principal control over the transport of radionuclides through the geosphere.
Bibliographic Reference: SEMINAR ON THE ENVIRONMENTAL TRANSFER TO MAN OF RADIONUCLIDES RELEASED FROM NUCLEAR INSTALLATIONS, BRUXELLES (BELGIUM), OCT. 17-21, 1983 - WRITE TO CEC LUXEMBOURG DG XIII/A2, POB 1907 MENTIONING PAPER E 31145 ORA
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Record Number: 1989122037500 / Last updated on: 1987-01-01
Available languages: en