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  • MIGRATION PROCESS IN MARINE SEDIMENTS CAUSED BY HEAT SOURCES - SIMULATION EXPERIMENTS RELATED TO DEEP SEA DISPOSAL OF HIGH LEVEL RADIOACTIVE WASTES

Abstract

Higher temperatures (from 4 to 80 degrees C) cause changes of K-d values for different elements like those studied: Cd and Pu-239. For Cd this was a reduction by a factor 10 for the temperature range 4-80 degrees C while the preliminary data for Pu show for a range of 4-140 degrees C not yet large differences, although all K-d's were higher than those of the literature. This has to be investigated more in detail. The results on convection experiments, steered and followed by model calculations, demonstrated that the convection of pore water of 10-11 m s-1 can be achieved in days at temperature differences of 70 degrees C. The so far achieved results allowed model calculations on the relationship between the safe burial depth and both the temperature related K-d's and convection coefficients. An inverse square root relationship might be used for the increase in burial depth and the K-d's or apparent diffusion coefficients. Although the limited amount of results only allow premature conclusions, reduction of K-d's, due to heat, seems to be possible, in spite of the fact that this is not a general phenomenon for each radioisotope.

Additional information

Authors: DUURSMA E K, DELTA INSTITUTE FOR HYDROBIOLOGICAL RESEARCH, YERSEKE (THE NETHERLANDS);TECHNICAL UNIVERSITY TWENTE, ENSCHEDE (THE NETHERLANDS);VAN GELDERMALSEN L A, DELTA INSTITUTE FOR HYDROBIOLOGICAL RESEARCH, YERSEKE (THE NETHERLANDS);TECHNICAL UNIVERSITY TWENTE, ENSCHEDE (THE NETHERLANDS);WEGEREEF J W DELTA INSTITUTE FOR HYDROBIOLOGICAL RESEARCH, YERSEKE (THE NETHERLANDS), DELTA INSTITUTE FOR HYDROBIOLOGICAL RESEARCH, YERSEKE (THE NETHERLANDS);TECHNICAL UNIVERSITY TWENTE, ENSCHEDE (THE NETHERLANDS);TECHNICAL UNIVERSITY TWENTE, ENSCHEDE (THE NETHERLANDS), DELTA INSTITUTE FOR HYDROBIOLOGICAL RESEARCH, YERSEKE (THE NETHERLANDS);TECHNICAL UNIVERSITY TWENTE, ENSCHEDE (THE NETHERLANDS)
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS, NUCLEAR SCIENCE AND TECHNO VOL. 5, NO. 3, PP 451-512, 1983, (EUR 8710 E).
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