D3.3: Advanced transient heat deposition models for Ants nodal solver including dynamic decay heat

One of the main objectives of the McSAFER project is to estimate the added benefit of using beyond the state-of-the-art high fidelity methods for reactor core physics compared to state of the art reduced order methods. This will be achieved by modelling the same small modular reactor (SMR) transients using high fidelity and reduced order methods.
Ants reduced order (nodal diffusion) solver within the Kraken framework constitutes one such reduced order solver as part of the two steps Serpent-Ants calculation chain that aims to provide full core neutronics solution based on the pre-calculated (micro-group constants) data from Serpent, continuous-energy Monte Carlo particle-transport code.
The availability of an advanced thermal energy deposition model in the time-dependent calculations to be conducted in the project is a must to produce accurate power distributions in transient or accident scenarios and design-basis parameters definition.
An explicit decay heat methodology, and its optimization via depletion system compression method, is proposed within the future needs of Ants calculations simulations to be conducted in Task 3.2 of the McSAFER project.