Measurements of miniature ionization chamber currents in the JSI TRIGA Mark II reactor demonstrate the importance of the delayed contribution to the photon fi eld in nuclear reactors
Radulović, Vladimir ...
The characterization of experimental locations of a research nuclear reactor implies the determination of neutron and photon fl ux levels within, with the best achievable accuracy. In nuclear ...reactors, photon fl uxes are commonly calculated by Monte Carlo simulations but rarely measured on-line. In this context, experiments were conducted with a miniature gas ionization chamber (MIC) based on miniature fi ssion chamber mechanical parts, recently developed by the CEA (French Atomic Energy and Alternative Energies Commission) irradiated in the core of the Jo ž ef Stefan Institute TRIGA Mark II reactor in Ljubljana, Slovenia. The aim of the study was to compare the measured MIC currents with calculated currents based on simulations with the MCNP6 code. A discrepancy of around 50% was observed between the measured and the calculated currents; in the latter taking into consideration only the prompt photon fi eld. Further experimental measurements of MIC currents following reactor SCRAMs (reactor shutdown with rapid insertions of control rods) provide evidence that over 30% of the total measured signal is due to the delayed photon fi eld, originating from fi ssion and activation products, which are untreated in the calculations. In the comparison between the measured and calculated values, these fi ndings imply an overall discrepancy of less than 20% of the total signal which is still unexplained
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