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Approach to Coupling 3-D Deterministic Neutron Transport and Full Field Computational Fluid Dynamics

ABSTRACT: Multi-physics analyses, including coupled three-dimensional (3-D) neutron transport and full eld computational uid dynamics (CFD), represent the future in advanced modeling of reactor cores. 3-D neutron transport and full- eld CFD simulations provide highly re ned and accurate solutions based on rst principles. Such an approach incorporates the full spatial and temporal coupling of interrelated physical phenomena for more detailed reactor analysis. Ultimately, this provides an advanced analysis environment leading to improvements in the level of detail in modeling and reduction of uncertainties in reactor safety. A model of a pressurized water reactor (PWR) fuel pin was developed for a 3-D neutron transport calculation and a full- eld CFD calculation in support of the proof-of-concept for a coupled simulation tool. This work discusses the model requirements for predicting localized feedback e ects in a nuclear reactor using a multiphysics approach. All aspects of the coupling methodology are presented, including results from the independent models, initialization of the coupled calculation, and the data exchange between the codes.

This work discusses the model requirements for predicting localized feedback e ects in a nuclear reactor using a multiphysics approach.