ASSESSMENT OF THE DISPERSION OF FISSION PRODUCTS IN THE ATMOSPHERE UNDER METEOROLOGICAL CONDITIONS OF LOW WIND SPEEDS WITH OR WITHOUT HIGH TEMPORAL AND SPATIAL VARIABILITY IN WIND SPEED DIRECTION
This study of atmospheric dispersion at low wind speed includes tracer experiments (SF-6, CEA - Cadarache site) and interpretation with a tri-Gaussian puff computer code of 6-CEA/EPSN. Interesting characteristic features of low wind speed under stable conditions were obtained. Slow temporal evolution of concentration in the field was observed with high concentration values a long time after release end. Interpretation of experimental results with the computer code, using certain standard deviations, shows reasonable agreement on maximum concentration values. However, the observed plume is narrower than calculated, and a better fit was obtained by modifying the standard deviations, especially reducing the transversal one. This effect is probably linked to site topography. Many observed differences between calculated and measured values are due to difficulty in evaluating the transport terms (wind speed and direction). Their punctual measurement gives a poor representation of mean pollutant transport, probably because of heterogeneity of wind field, at Cadarache, in low wind speed situations.
Bibliographic Reference: EUR 9925 EN (1985) MF, 118 P., BFR 300, BLOW-UP COPY BFR 590, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123081000 / Last updated on: 1987-01-01
Available languages: en