D3.7: Advanced transient heat deposition models for Serpent 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 modeling the same small modular reactor (SMR)
transients using high fidelity and reduced order methods.
Serpent 2 continuous energy Monte Carlo particle transport code within the Kraken framework
constitutes part of the two steps Serpent-Ants calculation chain that aims to provide full core
reduced-order neutronics solution via Ants nodal diffusion solver based on the pre-calculated (microgroup
constants) data from Serpent, as well as high-fidelity, reference, solution by itself.
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.
A group-based decay heat curve-fitting methodology is proposed within the future needs of Serpent
calculations simulations to be conducted in Task 3.4 of the McSAFER project.