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KMID : 0364920000250020075
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Journal of Radiation Protection and Research
2000 Volume.25 No. 2 p.75 ~ p.80
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Comparison of Measured and Predicted ³H Concentrations in Environmental Media around the Wolsung Site for the Validation of INDAC Code
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Abstract
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The predicted results of INDAC code were compared with measured ³H concentrations in air and pine-needle around the Wolsung site. The optimal sets of input data to INDAC were in addition selected by comparing the measured values with the predicted values of INDAC based on various conditions such as the release modes of effiuents into the environment, the classification of wind classes, and the consideration of terrain. The predicted ³H concentrations in air and pine-needle were shown to have good agreement with measured values, although there are some limitations such as uncertainties in measured values, complex topology around the site, and the land-sea breeze effects. The assumption on the ³H behavior in vegetables or plants that the ratio of ³H concentration in plant water to ³H concentration in atmospheric water is 1/2 was shown to be conservative in terms of the audit calculation performed by the regulator. It was also found that data sets based on mixed mode and no terrain data were not appropriate for the audit calculation ensuring the compliance with regulations. Thus, if the mixed mode is considered as the release mode of effiuents into the environment, meteorological data measured at 58 m height and terrain data should be used to evaluate the atmospheric dispersion factor.
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