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About the position We invite applications for a PhD Research Fellow position in Computational Nuclear Physics and Reactor Simulations at the Department of Physics. The PhD Research Fellow will be part of the Norwegian Nuclear Research Centre (NNRC).  NNRC is a cross-disciplinary collaboration between Norway’s leading institutions within nuclear physics and nuclear chemistry research: University of Oslo (UiO), Norwegian University of Life Sciences (NMBU), and Institute for Energy Technology (IFE). The Centre addresses major research questions within the nuclear field spanning topics from nuclear properties and medical isotope production to reactor simulations and environmental radiochemistry. Starting date as soon as possible, preferably before December 1st, 2026. The fellowship period is three years. The position may include a fourth year, resulting in a total of 25% of the appointment being dedicated to other career-development activities, normally teaching and/or supervision. This is determined based on the department’s needs and the candidate’s qualifications.” No one can be appointed for more than one PhD Research Fellowship period at the University of Oslo.  Project description/work tasks The Nuclear Physics group at UiO is involved in several research themes within the Norwegian Nuclear Research Centre (NNRC), from fundamental research within nuclear properties and nuclear fission, to more applied research within nuclear simulations and radionuclide production and speciation. This PhD Research Fellow will mostly contribute to nuclear simulations (reactor simulations). The project will include reactor simulations of future reactor systems with a focus on systems relevant for Norway. The objective is to further develop and validate machine-learning surrogate models derived from high-fidelity multiphysics simulations of reactor transients and quantify how surrogate uncertainties propagate through system safety analysis of nuclear installations, using tools such as open simulations platforms. This research will be part of a larger international collaboration and be a part of the Norwegian Nuclear Research Centre. The candidate is expected to contribute to and partake in activities organised by the Centre. What skills are important in this role? The Faculty of Mathematics and Natural Sciences has a strategic ambition to be among Europe’s leading communities for research, education and innovation. Candidates for these fellowships will be selected in accordance with this, and expected to be in the upper segment of their class with respect to academic credentials. Required qualifications: Master’s degree or equivalent in physics or nuclear technology, with specialization in nuclear physics or reactor physics Foreign completed degree (M.Sc.-level) corresponding to a minimum of four years in the Norwegian educational system A solid background in scientific computing, for example Python Candidates without a master’s degree have until 1 October 2026 to complete the final exam. Desired qualifications: The following qualifications are considered strongly desirable and will be used in the ranking of the candidates: Experience with reactor simulations in for example OpenMC or system codes, like RE-LAP Experience with data analysis techniques  Experience using ML Familiarity with data analysis tools such as ROOT Knowledge of reactor physics and nuclear structure from master-level courses Teaching experience Language requirement: Good oral and written communication skills in English English requirements for applicants from outside of EU/ EEA countries and exemptions from the requirements: https://www.mn.uio.no/english/research/phd/regulations/regulations.html#toc8 Grade requirements: The norm is as follows: The average grade point for courses included in the Bachelor’s degree must be C or better in the Norwegian educational system T