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Abstract

Tritium emissions due to continuous or accidental releases are of great importance in assessing the potential environmental and health impact of fusion power reactors. One of the more relevant processes in respect to local dose contribution after a release of elemental tritium is its conversion to HTO by microorganisms present in the soil. To study on a real scale the effect of soil characteristics on the reaction rate, some field trials have been performed, within the frame of an EC coordinated research project during which a certain quantity of tritium gas has been released in a tritium facility of the French Atomic Commission. A number of experimental groups from different countries have been involved in the detection of HT and HTO concentration in the field. The observed values, both in the air and on the soil, at different distances from the source point have then been compared with the results of the models, purposely adapted to investigate the phenomenon. In these models, the most important removal mechanisms of tritium and tritium compounds on the earth's surface have been taken into account. In spite of some differences in the modelling assumptions, the comparison between the calculated values of HT and HTO concentration shows general agreement. The same conclusion applies when comparing the code results with the experimental data, indicating that not only the most important features of the phenomenon have been well understood and modelled, but also that the numerical values of the parameters are correctly quantified.

Additional information

Authors: CRABOL B CEA (FRANCE) EDLUND O STUDSVIK ENERGY (SWEDEN) GRAZIANI G JRC ISPRA ESTAB. (ITALY) , CEA (FRANCE);STUDSVIK ENERGY (SWEDEN);JRC ISPRA ESTAB. (ITALY)
Bibliographic Reference: TOPICAL MEETING TRITIUM TECHNOLOGY IN FISSION, FUSION AND ISOTOPIC APPLICATION, TORONTO (CANADA), MAY, 1-6, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34009 ORA
Availability: Can be ordered online
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