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(45-02) Construction of Integrated and Structured Biosphere Models for the Assessment of Chemical and Radiological Impacts to Man and the Environment: The Symbiose Programme. Gonze, Marc-André*,1, Santucci, Pascal1, 1 IPSN, CE Cadarche, Bd 159, Saint-Paul-lez-Durance, France ABSTRACT- A lot of the existing biosphere assessment tools belonging to the nuclear circles were built 10 to 20 years ago. Their developments have usually led to calculational tools which are commonly deemed today as fit-for-purpose. Moreover, the time which has elapsed since their constructions has very often been used by developers and assessors as a way for performing validation and inter-comparison exercises, through international fora, like IAEA / VAMP, BIOMOVS II and IAEA / BIOMASS. However, it is also important to consider that during the same period the scientific content of radioecological modelling has progressed, requiring in return some model updates. Besides, programmes like BIOMOVS II and BIOMASS have highlighted the necessity to emplace any modelling performance within a methodological framework, so that to properly managed traceability, in terms of documentation and updates conduct, and model developments, in terms of system structures and definition of relevant endpoints. In particular, recent international discussions have emphasised the importance of addressing the modelling of the impact to the environment, even if its justification is still under review. For these reasons, the IPSN has launched a new modelling programme called Symbiose, the aim of which is to integrate the following aspects : first, the reliance on the fact that the biosphere transfers can be represented by the same mathematical formulation ; second, the biosphere source term, either punctual or diffuse, either routine-related or accidental, could be considered by the same type of model ; third, conceptual tools like flux / interaction matrices are relevant for managing biosphere components as belonging to generalised systems, with various structure levels and interactions, e.g. depending upon knowledge and future model purpose ; fourth, it is now important to forecast the integration of connected domains like the chemical / radiological fields, or the ecological modelling as such (population dynamics), all the more since the environmental protection should be tackled as a whole. Key words: Biosphere , Pollutant, Modelling |
