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  • REVIEW OF SPECIFIC EFFECTS IN ATMOSPHERIC DISPERSION CALCULATIONS. THE IMPACT OF SOURCE TERM CHARACTERISTICS AND THE PROCESSES THAT MODIFY THEM POST RELEASE ON DRY AND WET DEPOSITION RATES

Abstract

Task 1 was prompted by the reviews of Dry deposition and Wet deposition carried out under contract No. SR011-80 UK(B). The source term characteristics potentially influencing behaviour were identified and examined, showing that a number of source characteristics, in addition to those conventionally provided could significantly influence deposition behaviour. Linking with this, a review was undertaken of past reactor accident risk assessment and more recent source term studies. The study also resulted in a list of processes capable of transforming the released material vis-a-vis deposition characteristics, including processes occurring in the near field and also those occurring as the plume travels downwind. Scoping calculations were performed for some of the processes (idealized accident scenarios). In Task 2, statistical theory was used to describe the behaviour of a plume both before and after detachment, and the limitations of theory were discussed. A review of the lateral wind velocity spectra was undertaken to predict the plume behaviour as a function of travel time, stability category and release duration.

Additional information

Authors: COOPER P J, UKAEA, CULCHETH, WARRINGTON (UK);UNDERWOOD B Y, UKAEA, CULCHETH, WARRINGTON (UK);BREARLEY I UKAEA, CULCHETH, WARRINGTON (UK), UKAEA, CULCHETH, WARRINGTON (UK)
Bibliographic Reference: EUR 8935 EN (1985) FS, VOL. 3, 100 P., BFR 350, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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