Septembre 2009SFRP Paris1 Contribution of CEA-Valduc centre on knowledge about atmospheric tritiated water transfers in the different compartments of the.

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Presentation transcript:

Septembre 2009SFRP Paris1 Contribution of CEA-Valduc centre on knowledge about atmospheric tritiated water transfers in the different compartments of the environment from survey data. Ph. GUETAT, A. TOGNELLI, L. VICHOT

Septembre 2009SFRP Paris2 Transferts Releases Atmospheric transfer Transfer Air / watertable /river –water –Tritium Food chain

Septembre 2009SFRP Paris3 Atmospheric Release : Tritium Constant annual Release for 10 y : about 1 gramme (358TBq) 100g/an 1g/an 100g/a 5g 1g

Septembre 2009SFRP Paris4 atmospheric Transfers Measures and assessments

Septembre 2009SFRP Paris5 Environment meteo Dry conditions Unstable Dry conditions stable rainy All stabilities

Septembre 2009SFRP Paris6 atmospheric Transfer measures and assessement NENWSE :

Septembre 2009SFRP Paris7 Hydrogeology

Septembre 2009SFRP Paris8 Bassin Versant de la Douix de Léry m Valduc Léry

Septembre 2009SFRP Paris9 Evolution of surface waters

Septembre 2009SFRP Paris10 Concentrations in tritium of the uper water table 1987

Septembre 2009SFRP Paris11 Concentrations in tritium of the uper water table 1997

Septembre 2009SFRP Paris12 Concentrations in tritium of the uper water table 2008

Septembre 2009SFRP Paris13 Free waters Data of environmental survey

Septembre 2009SFRP Paris14 rains less tritiated than air water vapor

Septembre 2009SFRP Paris15 Surface waters small influence of rains

Septembre 2009SFRP Paris16 Grass between air vapor and rain water

Septembre 2009SFRP Paris17 milk « average » of grass

Septembre 2009SFRP Paris18 When rain deposition small, vapor deposition can be seen Station on siteSouthNorth-EastNord-West HTO air vapor w (Bq/l) HTO rain (Bq/l) HTO soil (Bq/l) Average of monthly measurements in : continuous 2: points

Septembre 2009SFRP Paris19 Tritium organically bound (Bq/L of combustion water)

Septembre 2009SFRP Paris20 Water concentrations in air, rain, and vegetables : free and combustion

Septembre 2009SFRP Paris21 Combustion water/ free water

Septembre 2009SFRP Paris22 Conclusions Wet deposition (rains) more important than supposed for water table Air vegetable transfer more important than free water OBT transfer Must we measure OBT for survey purpose ? Which parameters in case of accident ? Validation of codes.