Comparison between field measurements of ⁸⁵Kr around the BNFL Sellafield reprocessing plant and the predictions of the NRPB R-91 and UK-ADMS atmospheric dispersion models
by R. Hill, I. Lowles, I. Teasdale, N. Chambers, C. Puxley, T. Parker
International Journal of Environment and Pollution (IJEP), Vol. 16, No. 1/2/3/4/5/6, 2001

Abstract: Air concentrations of the radioisotope krypton-85 (⁸⁵Kr), released from the BNFL Sellafield reprocessing site, were compared with the predictions of two atmospheric dispersion models NRPB R-91 and the next generation UK-ADMS model (version 3). Data on stack emissions and local meteorology were used as model input, whilst building effects were included using a simple ''effective stack height'' approach. Both models tended to make conservative estimates of air concentrations, with slightly higher overestimations being predicted by the UK-ADMS model. Both models had similar fractions of predictions within a factor of two (35% for UK-ADMS and 34% for R-91) and five (56% for UK-ADMS and 62% for R-91) of the measurements. It was concluded that, when using the simple ''effective stack height'' approach, there was little discernible advantage of applying the UKADMS model in preference to the R-91 model at the BNFL Sellafield site. Further research will investigate the influence of the UK-ADMS ''complex effects'' modules on the dispersion predictions.

Online publication date: Mon, 07-Jul-2003

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