Michał Jędrzejczyk

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Building 39 (“Cyfronet”), room 203
ul. Andrzeja Sołtana 7
05-400 Otwock, Poland.
+48 22 273 1687





PhD Topic: Multi-Physics Uncertainty Analysis of High Temperature Gas Cooled Reactor
Supervisor: Prof. Tomasz Kozłowski

The development of the High Temperature Gas Cooled Reactors (HTGRs) requires verification of HTGR design and safety features with reliable high fidelity physics models and robust, efficient, and accurate codes. The predictive capability of coupled neutronics/thermal-hydraulics simulations for reactor design and safety analysis can be assessed with sensitivity analysis (SA) and uncertainty analysis (UA) methods. Uncertainty originates from errors in physical data, manufacturing uncertainties, and modelling and computational algorithms. SA is helpful to partition the prediction uncertainty to various contributing sources of uncertainty and error. SA and UA is required to address cost, safety, and licensing needs and should be applied to all aspects of reactor multi-physics simulation. Current SA and UA rely either on derivative based methods, stochastic sampling methods, or on generalized perturbation theory to obtain sensitivity coefficients. The proposed project will develop and new hybrid multi-physics uncertainty method to quantify the impact of different sources of uncertainties on the design and safety parameters of HTGRs. Only a parallel effort in advanced simulation and in nuclear data improvement will be able to provide designers with more general and well-validated calculation tools to meet design target accuracies.

Seminars and conference talks:

    • Establishment of reasonable model to simulate emergency passive coolant system in HTTR reactor. 03.11.2020, Otwock, NCBJ, Division of Nuclear Energy and Environmental Studies.