Effects of Neutron Flux Distribution and Control Rod Shadowing on Control Rod Calibrations in the Oregon State TRIGA Reactor
Journal of Nuclear Engineering, ISSN: 2673-4362, Vol: 5, Issue: 1, Page: 13-25
2024
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Research Reports on Nuclear Engineering from Oregon State University Provide New Insights [Effects of Neutron Flux Distribution and Control Rod Shadowing on Control Rod Calibrations in the Oregon State TRIGA® Reactor]
2024 JAN 24 (NewsRx) -- By a News Reporter-Staff News Editor at Engineering Daily News -- New study results on nuclear engineering have been published.
Article Description
Control rod calibration experiment results for the Oregon State TRIGA Reactor (OSTR) immediately following LEU conversion in 2008, and MCNP 5 predicted rod worths from the 2008 LEU Conversion Safety Analysis Report (CSAR) are discussed. The reactivity worth of the four OSTR control rods is measured using the rod-pull method. Reactor power and period measurements in this method rely on the fission chamber power detector on the north side of the reflector. It is proposed that the location of the fission chamber and the neutron flux distribution in the core may result in an inaccurate reactor period measurement due to the asymmetry of the neutron flux distribution in the OSTR core. The asymmetry of the flux is believed to be more pronounced during super-criticality, resulting in errors in the time-of-power-rise measurements. As a result, control rod calibration experiments may under-predict or over-predict the reactivity worth of certain control rods. A time-independent Monte–Carlo method for the quantification of these effects is presented. Thermal flux maps at the core axial mid-plane are obtained from the model to inform discrepancies between predicted and observed results.
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