Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Evaluation of reactor pulse experiments

  • I. Svajger (Jozef Stefan Institute, Reactor Physics Department) ;
  • D. Calic (Jozef Stefan Institute, Reactor Physics Department) ;
  • A. Pungercic (Jozef Stefan Institute, Reactor Physics Department) ;
  • A. Trkov (Jozef Stefan Institute, Reactor Physics Department) ;
  • L. Snoj (Jozef Stefan Institute, Reactor Physics Department)
  • Received : 2023.07.25
  • Accepted : 2023.11.10
  • Published : 2024.04.25
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Abstract

In the paper we validate theoretical models of the pulse against experimental data from the Jozef Stefan Institute TRIGA Mark II research reactor. Data from all pulse experiments since 1991 have been collected, analysed and are publicly available. This paper summarizes the validation study, which is focused on the comparison between experimental values, theoretical predictions (Fuchs-Hansen and Nordheim-Fuchs models) and calculation using computational program Improved Pulse Model. The results show that the theoretical models predicts higher maximum power but lower total released energy, full width at half maximum and the time when the maximum power is reached is shorter, compared to Improved Pulse Model. We evaluate the uncertainties in pulse physical parameters (maximum power, total released energy and full width at half maximum) due to uncertainties in reactor physical parameters (inserted reactivity, delayed neutron fraction, prompt neutron lifetime and effective temperature reactivity coefficient of fuel). It is found that taking into account overestimated correlation of reactor physical parameters does not significantly affect the estimated uncertainties of pulse physical parameters. The relative uncertainties of pulse physical parameters decrease with increasing inserted reactivity. If all reactor physical parameters feature an uncorrelated uncertainty of 10 % the estimated total uncertainty in peak pulse power at 3 $ inserted reactivity is 59 %, where significant contributions come from uncertainties in prompt neutron lifetime and effective temperature reactivity coefficient of fuel. In addition we analyse contribution of two physical mechanisms (Doppler broadening of resonances and neutron spectrum shift) that contribute to the temperature reactivity coefficient of fuel. The Doppler effect contributes around 30 %-15 % while the rest is due to the thermal spectrum hardening for a temperature range between 300 K and 800 K.

Keywords

Acknowledgement

The authors would like to thank to JSI TRIGA operators (Anze Jazbec, Marko Rosman, Sebastjan Rupnik, Andraz Verdir and former operator Darko Kavsek) for assistance in performing experiments and in colleating and analysing of measured data. The authors acknowledge the financial support from the Slovenian Research Agency (research core funding No. (P2-0073), research project no. (NC-0011) and research infrastructure core funding TRIGA Mark II research reactor).

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