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Communication Dans Un Congrès Année : 2010

The OSCAR code package : A unique tool for simulating PWR contamination

Gilles Ranchoux
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EDF
Julien Bonnefon
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EDF
Vincent Bonelli
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EDF
Martin Bachet
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EDF
Geoffroy Riot
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Frédéric Grangeon
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Résumé

Understanding the PWR primary circuit contamination by corrosion products, fission products and actinides is a crucial issue for reactor operation and design. The main challenges are decreasing the impact on personnel exposure to radiation, optimizing the plant operation, limiting the activity of the wastes produced during the reactor lifetime and preparing decommissioning. In cooperation with EDF and AREVA NP, CEA has developed the OSCAR code package, a unique tool for simulating PWR contamination. The OSCAR package results from the merging of two codes, which simulate PWR contamination by fission products and actinides (PROFIP code) and by activated corrosion products (PACTOLE code). These two codes have been validated separately against an extensive set of data obtained over 40 years from in-situ gamma spectrometry measurements, sampling and analysing campaigns of primary coolant, as well as experiments in test loops or experimental reactors, which are representative of PWR conditions. In this paper, a new step is presented with the OSCAR code package, combining the features of the two codes and motivated by the fact that, wherever they originate from, the contamination products are subject to the same severe conditions (300 °C, 150 bar, neutron flux, water velocity up to 15 m.s-1) and follow the same transport mechanisms in the primary circuit. The main processes involved are erosion/deposition, dissolution/precipitation, adsorption/desorption, convection, purification, neutron activation, radioactive decrease. The V1.1 version of the OSCAR package is qualified for fission products (Xe, Kr, I, Sr), actinides (U, Np, Pu, Am, Cm) and corrosion products (Ni, Fe, Co, Cr). This paper presents the different release modes (defective fuel rod release, fissile material dissemination, material corrosion and release), then the processes which govern contamination transfer, and finally, we give examples of the comparison of the OSCAR package results with measurements in French PWR primary circuit obtained for representative radioisotopes : $^{133}$Xe, $^{90}$Sr, $^{58}$Co, $^{60}$Co. In particular, we focus on the main upgrades in the OSCAR simulations compared to the PROFIP and PACTOLE codes : adaptation of the MARGARET module to assess fission product release out of fuel pellets in a defective rod, adsorption/desorption model development for strontium behaviour, multi-criteria calibration of input data which are not well known for corrosion product simulation.
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cea-04473988 , version 1 (22-02-2024)

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  • HAL Id : cea-04473988 , version 1

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J.B. Génin, Hervé Marteau, Frédéric Dacquait, Gilles Benier, Jerome Francescatto, et al.. The OSCAR code package : A unique tool for simulating PWR contamination. NPC 2010 - Nuclear PLant Chemistry 2010 - International Conference on Water Chemistry of Nuclear Reactors Systems, Jul 2010, Quebec city, Canada. ⟨cea-04473988⟩
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