This paper presents the development and preliminary validation of the transient transport capability within the framework of the pin resolved, 2D-1D method in the core neutronics code MPACT. A description of the transient methodology developed in MPACT is first provided and then two alternative transient CMFD acceleration techniques are described, a one group (1G) and a multigroup (MG) CMFD. Results show that the MG CMFD is more effective for practical transient problems. The NEM nodal transient method is then presented as the ID axial solver for the 2D-1D method in MPACT. Numerical results are then presented for the 2D TWIGL and 3D SPERT benchmarks. The TWIGL results from MPACT are shown to agree well with the DeCART transport code and other reference solutions. Preliminary results are then shown for the SPERT Ⅲ test 86 case and the MPACT result is shown to be in reasonable agreement with the experimental data.
展开▼
