De Pietri, MarcoFiorina, C.Le Tonqueze, Y.Juárez Mañas, Rafael2024-10-032024-10-032024-08De Pietri, Fiorina, Le Tonqueze, & Juarez. (2024). Computational study of the Nitrogen-16 source term in the ITER vacuum vessel cooling circuit through the coupling of system-level analysis code and CFD. Nuclear Engineering and Technology, 56(8), 2990-2998. https://doi.org/10.1016/J.NET.2024.03.0011738-5733 | eISSN 2234-358Xhttps://doi.org/10.1016/j.net.2024.03.001https://hdl.handle.net/20.500.14468/23875This is a Submitted Manuscript of an article published by Elsevier in "JNuclear Engineering and Technology, 56(8), 2990-2998", available at: https://doi.org/10.1016/j.net.2024.03.001Este es el manuscrito enviado del artículo publicado por Elsevier en "Nuclear Engineering and Technology, 56(8), 2990-2998", disponible en línea: https://doi.org/10.1016/j.net.2024.03.001In ITER, the evaluation of the activated water radiation source and its impact on the radiological levels is necessary to demonstrate compliance with the safety requirements. The use of simplified or conservative approaches often results in the application of expensive constraints on the installation that impact its economics, operations, and construction schedule. In this work, we propose a novel methodology to calculate the activated water source term with a higher degree of realism. The methodology is based on the coupling of a system-level code with a Computational Fluid Dynamics (CFD) code in an explicit, one-way approach. We apply this methodology to the evaluation of the 16N radioisotope within the ITER Vacuum Vessel Primary Heat Transfer System (VV-PHTS) cooling circuit in a steady-state and transient scenarios. We chose this system since previous analyses of the VV-PHTS were done with simple, ad-hoc calculations that yielded results that differed by up to a factor of five, underscoring a higher level of uncertainty. As a result, we generate a computational model of the source term that can be used to evaluate the radiological condition surrounding the cooling systems during the operations.eninfo:eu-repo/semantics/openAccess33 Ciencias Tecnológicas::3320 Tecnología nuclearartículofusion neutronicswater activationITER