Juárez Mañas, RafaelCatalán Pérez, Juan PabloLópez Revelles, Antonio JesúsSauvan, PatrickJakhar, ShrichandPolunovskyi, EdouardLoughlin, MichaelSanz Gozalo, JavierOgando Serrano, Francisco M.2026-02-242026-02-242018-09-27Juárez, R., Catalan, J.P., Ogando, F., Lopez Revelles, A.J., Sauvan, P., Jakhar, S., Polunovskiy, E., Loughlin, M. y Sanz,J., (2018). ITER plasma source and building modelling to produce radiation maps. Nuclear Fusion 58(12), 1-8. https://doi.org/10.1088/1741-4326/aadf9c0029-5515https://doi.org/10.1088/1741-4326/aadf9chttps://hdl.handle.net/20.500.14468/31933This is an Accepted Manuscript of an article published by IOP Publishing in "Nuclear Fusion 58(12), 1-8", available at: https://doi.org/10.1088/1741-4326/aadf9cEste es el manuscrito aceptado del artículo publicado por IOP Publishing in "Nuclear Fusion 58(12), 1-8", disponible en línea: https://doi.org/10.1088/1741-4326/aadf9cThe ITER Tokamak Complex is the civil structure that will host the ITER Tokamak and the largest part of the associated systems. The dimensions are 120 m  ×  80 m  ×  60 m, built mostly of concrete, with over one thousand penetrations. During ITER operation, a radiation field will spread throughout the complex from diverse radiation sources. It must be characterized to check the compliance with the limits for electronics allocation and human intervention. However, the production of radiation maps in the ITER Tokamak Complex is a task of paramount sophistication due to challenges to adequately model in MCNP the radiation sources involved. In this work, two important methodological upgrades are presented. First, a new MCNP model of the Tokamak Complex, conceived to be computationally stable while capturing a conservative representation of the baseline. Second, a novel approach to model the plasma source, called a mosaic source, allows an unprecedented degree of realism and accuracy in terms of capturing the port specificities. Both represent a step change in the capacity to produce ITER radiation maps with increased reliability, augmenting previous versions. Examples of partial radiation maps are provided considering both methodological upgrades.eninfo:eu-repo/semantics/openAccess3320 Tecnología nuclearartículoITERTokamak ComplexRadiation mapsSource modellingMCNP1741-4326