The ITER tokamak neutronics reference model C-Model

The ITER Organization maintains neutronics reference models for nuclear analysis. The "lite" series of tokamak sector models has progressed over many years to the C-lite V1 model released at the end of 2013. Since then several model updates have been continuously implemented in various C-lite V2 models. The latest release, C-Model represents the 40 degrees regular sector of the tokamak up to the bioshield with central upper, equatorial and lower ports, i.e. an even-port configuration. C-Model, as previous C-lite models, is based on a modular concept of model envelopes which fill all space of the torus sector. This envelope block structure has been adopted to facilitate model update management on the basis of single standalone models, which can be easily replaced in the model assembly. C-Model has been significantly improved with respect to C-lite in terms of specific system model design status and level of detail, focused on in-vessel and vessel components. The development of those updated system models was conducted according to the quality standards of ITER reference models. Modelling instructions, documentation and verification formed an essential part of the related activities.