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IRSN, Institut de radioprotection et de sûreté nucléaire

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Enhancing Nuclear Safety


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EXTREME project - Launch report

Rapport DEI/SESURE n°2005-07

Summary

Due to the drastic decrease in artificial radioactivity levels from primary sources such as atmospheric fallout or industrial releases, radioactive storages constituted in the past within several environmental compartments act today as non negligible secondary sources. These delayed sources are particularly active during extreme meteo climatic events such as rainfalls or atmospheric deposits, floods, storms, etc… that may remove important mass, generate activity levels higher than the predicted ones from modelisation based on mean transfer process, and produce in a couple of hours or days fluxes similar to those accrued over several month or years. EXTREME aims at assessing the consequences on man and its environment of natural events that generate extreme radioactive stocks and/or fluxes within several environmental compartments (atmosphere, soils, rivers, coastal marine environment and deep sea areas).

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