Definition and optimization of a MELCOR model of the IFMIF-DONES Argon Purification Subsystem Manjavacas Lucas, Antonio Vázquez-Barroso, M. A. Torregrosa-Martín, Claudio Maestre, J. Martín-Fuertes, Francisco IFMIF-DONES MELCOR Particle accelerators Safety Nuclear fusion Lithium This work has been financed by the Consejo de Seguridad Nuclear, Spain through the “Subvención de I+D+i SUBV-12/2021 Ref. PR-051-2021”. In addition, it has been financed by the Junta de Andalucia through the project “SE2021 UGR IFMIF-DONES” co-financed by the European Regional Development Fund ERDF “A way to make Europe”/“Andalusia moves with Europe”. Finally, the work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). IFMIF-DONES will be an experimental facility designed to irradiate material samples under conditions similar to those expected in future fusion power reactors. As a radiological facility, it requires the precise design of specific safety subsystems to ensure the protection of the public, the plant personnel and the environment. This is the case of the Argon Purification Subsystem (ArPS), which is responsible for ensuring the inertization of those rooms where liquid Li may be present, involving a risk of fire and hazardous releases. In this context, it is important to set Ar purity requirements as design input for the ArPS to ensure this inertization while being technically sound due to the large amounts of volumes involved. To support this design process, a MELCOR simulation model of the IFMIF-DONES ArPS has been developed. Using this model, we perform a parametric study to analyse the performance of this subsystem under different configurations. The goal is to keep the impurity concentrations of the inert rooms stable during a year of operation in order to minimize the risk of Li reactions, while ensuring dynamic confinement and reducing Ar consumption. In addition, the transition between maintenance and operation modes is considered, analysing the effect of different transition periods and injected Ar inventory. 2024-07-02T08:21:42Z 2024-07-02T08:21:42Z 2024-07-02 info:eu-repo/semantics/article A. Manjavacas et al. Definition and Optimization of a Melcor Model of the Ifmif-Dones Argon Purification Subsystem. Fusion Engineering and Design 205 (2024) 114560. https://doi.org/10.1016/j.fusengdes.2024.114560 https://hdl.handle.net/10481/92914 10.1016/j.fusengdes.2024.114560 eng info:eu-repo/grantAgreement/EC/EUROfusion/101052200 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier