ORGANIC BOUND TRITIUM PUBLIC DOSES DUE TO TRITIUM EMISSIONS FROM CERNAVODA NUCLEAR POWER PLANT: A CASE STUDY

摘要

In a CANDU type reactor, such those of Ceranvoda NPP (Romania), tritium is generated by thermal-neutron-capture reactions: ~2H (n, γ) ~3H mainly in moderator and heat transfer system. Further, during maintenance and normal operation, a very small amounts of tritiated heavy water (DTO) may escape and diffuse in the environment. Absorbed and metabolised by plants, DTO contribute to the formation of the Organic Bound Tritium (OBT) which finally enters food chain reaching human body. Our results, based on the experimental data regarding DTO environmental content in the vicinity of Cernavoda NPP, OBT/DTO ratio as well as food consumption have showed that for routine releases of DTO into air and water, the OBT contributes with less then 25% to the total public tritium dose, which, at its turn was, at Cernavoda city, less than 0.3 μSv y~（-1）.