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Experience after 10 years of monitoring 14C in the vicinity of the Nuclear Power Plant Krško, Slovenia

In this presentation we will summarize the 10-year-long experience in monitoring 14C activity in the close vicinity of the Krško Nuclear Power Plant (NPP) in Slovenia. Atmospheric CO2 samples have been taken in 2-month periods during the regular operation of the power plant, or in shorter periods during refuelling periods. Biological samples (apples, corn, wheat, grass, vegetables) have been samples twice a year (in summer and autumn) in two circles around the NPP, inner and outer, and at the control point 12 km from the plant. The aim of the monitoring was to estimating a possible influence of the NPP on environmental 14C levels and on the effective dose of local population through food chain. Increase of 14C activity in atmospheric CO2 was observed during and immediately after the refuelling of the power plant, performed every 18 months. Good correlation between the total 14C activity released in gaseous effluents and the 14C activity of the atmospheric CO2 has been observed. 14C activity in plants collected close to the Krško NPP is always higher than the activities on the control point, and depends both on the distance from the exhaust of the plant ventilation system and on wind direction: it is higher on the location in the SW-NE direction that coincided with the most pronounced wind directions. Higher 14C activities have been determined in plants collected in summer after the spring refuelling than in those collected during the following vegetation period after the autumn refuelling. This can be explained by the uptake of the CO2 of higher 14C activity for the process of photosynthesis after spring refuelling. To estimate the realistic effective dose due to ingestion to the population in the vicinity, a model of food consumption has been proposed. The calculated dose for the population at the NPP vicinity is not significantly different from the dose for the population at the control point.

14C ; monitoring ; atmospheric CO2 ; biological material ; NEK ; 10 years

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