Assessment of Radioactive Liquid EffluentsRelease at IPEN-CNEN/SP

摘要

A continuous effluent monitoring program has been established at IPEN's plant in order toallow an environmental impact assessment due to radioactive liquid effluent discharge to sanitarysystem. Representative samples of radioactive liquid effluents are analyzed by using high resolutiongamma spectroscopy and instrumental neutron activation analysis, facing to Brazilian radioprotectionregulatory rules. The results are consolidating yearly in the Institute source-term. In this paper, resultsof the source-term are presented, concerning to years 2004, 2005 and 2006. The total activitydischarged was 8.5 x10~8Bq, 5.7x10~8Bq and 2.7x10~8Bq. respectively. As the release is stronglydependent on the total amount of the effluent and on the dilution factor, special attention is needed inorder to obtain the correct value of that last one. The estimated inside plant dilution factor,considering the recent facilities and the reshaping of the sewerage system was 80, 180 and 130, forperiod of 2004, 2005 and 2006 discharged liquid radioactive effluent.