tailieunhanh - Influence of the dissolved hydrogen concentration on the radioactive contamination of the primary loops of DOEL-4 PWR using the OSCAR code

The aim of this article is to evaluate the influence of the change in the Dissolved Hydrogen (DH) concentration on the contamination of the primary loops of DOEL-4 PWR, a Belgian unit. After the description of the principle of the OSCAR code, its use is illustrated with the simulation of DOEL-4. | Influence of the dissolved hydrogen concentration on the radioactive contamination of the primary loops of DOEL-4 PWR using the OSCAR code EPJ Nuclear Sci. Technol. 6 7 2020 Nuclear Sciences M. Gherrab et al. published by EDP Sciences 2020 amp Technologies https epjn 2020005 Available online at https REGULAR ARTICLE Influence of the dissolved hydrogen concentration on the radioactive contamination of the primary loops of DOEL-4 PWR using the OSCAR code Mehdi Gherrab1 Frédéric Dacquait1 Dominique You2 Etienne Tevissen1 Raphaël Lecocq3 and Kim Schildermans3 1 CEA DEN 13108 Saint-Paul Lez Durance France 2 CEA DEN 91191 Gif-sur-Yvette France 3 ENGIE LABORELEC 1630 Linkebeek Belgium Received 17 January 2019 Received in final form 9 June 2019 Accepted 22 January 2020 Abstract. Corrosion products are generated in the primary circuit during normal operation and are activated in the core. Those activated corrosion products mainly 58Co and 60Co coming respectively from the activation of 58 Ni and 59Co are then transported by the primary fluid and deposited on the out-of-flux surfaces steam generators primary coolant pipes . To minimize this radioactive contamination one needs to understand the behavior of corrosion products by carrying out measurements in PWRs and test loops combined with a reactor contamination assessment code named OSCAR. The aim of this article is to evaluate the influence of the change in the Dissolved Hydrogen DH concentration on the contamination of the primary loops of DOEL-4 PWR a Belgian unit. After the description of the principle of the OSCAR code its use is illustrated with the simulation of DOEL-4. Finally those calculations are compared to autoclave experiments called DUPLEX with thermodynamic and chemical conditions closed to those observed in PWRs. OSCAR calculations show that an increase in the DH concentration results in a decrease in 58Co surface activities. These results are consistent with those from .