Dept. Ingeniería Energética, Universidad Nacional de Educación a Distancia (UNED), C/ Juan del Rosal 12, 28040, Madrid, Spain.
ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067, St. Paul Lez Durance Cedex, France.
Sci Rep. 2023 Mar 2;13(1):3544. doi: 10.1038/s41598-023-30534-x.
During ITER operational life, a remote-handled cask will be used to transfer In-Vessel components to the Hot Cell for maintenance, storage and decommissioning purposes. Due to the distribution of penetrations for system allocation in the facility, the radiation field of each transfer operation presents a high spatial variability; all operations must be studied independently for workers and electronics protection. In this paper, we present a fully representative approach to describe the radiation environment during the complete remote-handling scenario of In-Vessel components in the ITER facility. The impact of all relevant radiation sources during different stages of the operation is addressed. As-built structures and 2020 baseline designs are considered to produce the most detailed neutronics model of the Tokamak Complex, the 400,000-tonne civil structure hosting the tokamak, up to date. Novel capabilities of the D1SUNED code have allowed to compute the integral dose, the dose rate and the photon-induced neutron flux of both moving and static radiation sources. Time bins are included in the simulations to compute the dose rate caused by In-Vessel components at all positions along the transfer. The time evolution of the dose rate is built in video format with a 1-m resolution, especially valuable for hot-spots identification.
在 ITER 的运行寿命期间，将使用远程操作的容器来将内部部件转移到热室中，以便进行维护、存储和退役。由于设施中系统分配的贯穿件分布，每次转移操作的辐射场具有高度的空间变异性；所有操作都必须针对工人和电子设备的防护进行独立研究。在本文中，我们提出了一种完全代表性的方法来描述 ITER 设施中内部部件的完整远程操作场景中的辐射环境。解决了操作不同阶段的所有相关辐射源的影响。考虑到已建结构和 2020 年基线设计，以最新的方式生成了托卡马克综合体的最详细的中子学模型，该综合体是容纳托卡马克的 40 万吨级民用结构。D1SUNED 代码的新功能允许计算移动和静态辐射源的积分剂量、剂量率和光子诱发中子通量。模拟中包括时间间隔，以计算在转移过程中内部部件在所有位置的剂量率。剂量率的时间演化以 1 米分辨率的视频格式构建，特别有利于识别热点。
