Since 1991, radiocarbon analyses of exhaust air have been part of the regular radioactivity monitoring program at the Krsko Nuclear Power Plant (NPP), a Westinghouse 632 MWe pressurized water reactor (PWR). Activity of CO2 and hydrocarbons has been identified; the former contributes ca. 43%. A normalized release of total 14C of 0.219 TBqGWe-1a-1 was obtained. Indoor air 14C concentrations in selected rooms inside the plant have generally been <5 Bq m-3, although rare peaks of >1000 Bq m-3 may be reached. Tree rings have shown slight enhanced 14C activity due to the operation of the plant.
[Radiocarbon Volume 39, Number 3, 1997]