Tritium transport and accountancy are central challenges for the design, safety, and performance assessment of fusion energy systems, requiring predictive modeling across multiple spatial and temporal scales. This paper presents recent developments in the Tritium Migration Analysis Program, version 8 (TMAP8), an open-source tritium transport modeling tool built on the Multiphysics Object-Oriented Simulation Environment (MOOSE) framework following high software quality assurance standards. TMAP8 enables fidelity-flexible simulations spanning from pore microstructure length scale to component-scale transport and up to system-level fuel cycle modeling within a single application. We introduce new modeling capabilities together with a substantially expanded suite of verification, validation, and benchmarking cases. The verification cases demonstrate accurate numerical solutions, while the validation cases assess predictive capability against experimental measurements. In addition, TMAP8 reproduces and benchmarks a recent tritium fuel cycle model, demonstrating ability over a wide range of scales. All verification and validation cases, input files, and analysis scripts are released as open source, supporting rigorous software quality assurance, transparent benchmarking, workforce development, and community reuse. These developments, in addition to the deployment of a simplified physics-based syntax, further establish TMAP8 as a robust multiscale modeling application for tritium transport analysis in fusion energy systems.
The development of the Plasma Control System (PCS) for ITER relies on control oriented models that enable rapid simulation while capturing the key off-normal operational scenarios. This work presents a dedicated framework to support Ion Cyclotron Heating (ICH) control design and validation within the PCS. The framework incorporates simplified models of the ICH plant, ion cyclotron wave–plasma coupling, and the impact of local gas injection on coupling conditions. It also includes the relevant PCS functional blocks and interfaces with the ICH system. All components are developed and integrated within the ITER PCS Simulation Platform (PCSSP). The models are designed to balance computational efficiency with sufficient fidelity to reproduce ICH specific dynamics and fault conditions relevant to the early ITER operational phase (SRO). Initial tests confirm that local gas injection controlled in real-time by the PCS can compensate for changes in the RF coupling resistance due to slow variations in the plasma position so that the requested ICH power can be maintained.
