User's manual of the coupled CORE SIM neutronic and thermo-hydraulic tool
Rapport, 2014

This report presents how to use the coupled CORE SIM neutronic/thermo-hydraulic tool. The models and algorithms used in the coupled version of CORE SIM, as well as the demonstration of the tool were already presented in two companion reports. The novelty of the tool resides in its versatility, since many different systems can be investigated and different kinds of calculations can be performed. More precisely, both critical systems and subcritical systems with an external neutron source can be studied, static and dynamic cases in the frequency domain (i.e. for stationary fluctuations) can be considered. For each situation, the three dimensional distributions of static neutron fluxes, all thermo-hydraulic parameters, their respective first-order noise are estimated, as well as the effective multiplication factor of the system. The main advantages of the tool, which is entirely MATLAB based, lie with the robustness of the implemented numerical algorithms, its high portability between different computer platforms and operative systems, and finally its ease of use since no input deck writing is required. The present version of the tool, which is based on two-group diffusion theory, is mostly suited to investigate thermal systems, both Pressurized and Boiling Water Reactors (PWR and BWR, respectively). The tool is freely available on direct request to the authors of the present report.

core simulator

coupled neutronics/thermal-hydraulics

noise analysis


Victor Dykin

Chalmers, Teknisk fysik, Nukleär teknik

Christophe Demaziere

Chalmers, Teknisk fysik, Nukleär teknik


Annan teknik

Annan fysik



CTH-NT - Chalmers University of Technology, Nuclear Engineering: 302

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