engleski

Risk Assessment of Radioactive Waste Disposal Facilities

This paper contains a short description of analytical method for risk assessment of radioactive waste disposal facilities based on calculation of a so-called concentration reduction factor. A conceptual model of a simple near-field intrusion scenario (receptor well), that is being analyzed is described and a review of input parameters characterizing radioactive waste, technical design of facility and site is given. The selected input parameters refer to a surface type of disposal facilities for low and medium level radioactive waste, which are assumed likely to be built in Croatia. The results reached by the analytical method developed by the authors of the article are compared to the results acquired on the same example by applying computer codes GWSCREEN and PAGAN. The authors state a good level of correspondence between them and point out the fact that the analytical method is conservative enough to serve as and adequate approximation to computer codes. The advantages of the analytical method are simplicity of application and minimum requirements for input parameters. This renders itself particularly convenient when only a conceptual technical design is available and when the siting process is not completed so that input parameters are not known to the extent necessary for application of sophisticated computer codes. Furthermore, analytical method approximates disposal facility performance and site characteristics by only one factor (concentration reduction factor), which represents a measure of isolation characteristics of a facility and a site. Such approach enables a simple comparison of various technical designs at a certain site, i.e. a certain technical design on various sites. The next significant advantage of analytical method is a relatively simple uncertainty analysis. As an example for this, the paper gives a short survey of one-parameter analysis of uncertainty of total concentration reduction factor for the Sr-90 case.

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