Danube River Basin is the second river basin in Europe comprising 18 countries.Lower Danube Basin covers the Romanian-Bulgarian sub-basin downstream of CazaneGorge and the sub-basins of Siret and Prut River. Cernavoda Nuclear Power, a CANDUtype reactor, is situated in this region upstream Danube Delta. Taking into account thefuture development of this important Romanian nuclear objective, the knowledge ofthe present condition of tritium and C-14 concentrations levels becomes a necessity.Therefore, an extensive monitoring program for these isotopes, along the Romaniansector of the Danube River Basin, starting with Cazane Gorge and ending with the threebranches of the Danube Delta, has been started. The tributaries from this sector: Cerna,Jiu, Olt, Arges are included also in this ongoing project. Preliminary results of tritiumlevel measured in 17 locations within the mentioned areas are presented in the paper.This tritium level is compared with the tritium concentration in precipitation duringthe year 2006. In order to make an isotopic evaluation of water balance, the monitoringprogram will run during the year 2007 extending the scope of interest on stable isotopes:2 H, 18 O, 13 C and a multivariate statistical analysis will be developed.
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