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• W1509623003 abstract "An experimental study has been performed on a coupled-core system consisting of two reactors each of which can be made critical by itself, coupled neutronically by a graphite thermal column. Both steady-state and transient measurements were performed on the system. The steady-state measurement consisted of measuring the coupling coefficient between the two reactors. Also, series of measurements were performed while one of the cores was far subcritical and the coupling between the two cores was varied between 1.6 x 10{sup -2} and 1.6 x 10{sup -5} cents by the insertion of a water gap and from 1.6 x 10{sup -2} cents to 6.0 x 10{sup -4} cents by the insertion of a cadmium sheet between the cores. The transient portion of the study was performed by pulsing one of the reactors (the Illinois Advanced TRIGA) and following the pulse into the passive core (the Low Power Reactor Assembly). The first pulse series measured the pulse as it emerged from the thermal column and propagated through the water, where no fuel was present. This provided an analysis of the neutron source to the passive core. The second pulse series was performed with the passive core far subcritical (k{sub eff} {approx_equal} 0.94)more » and investigated the effects on the transient coupling of the insertion of water gaps of up to 9 inches or a cadmium sheet ({sigma}T = 3.2) between the two cores. Spatial measurements of the pulse in the far subcritical assembly also were performed. The third series of pulses investigated the characteristics of the pulse in the passive core when it was subcritical, just critical, and supercritical, The effects on the FWHM of the pulse in the passive core and on the delay time between the peak of the pulse in the TRIGA and the passive core were measured for the passive core having a k{sub eff} from 0.936 to 1.0015 and the initial period of the pulse in TRIGA varying from 15.6 {+-} .7 ms to 3.58 {+-} .05 ms. The FWHM increased from 13.5 {+-} 0.5 ms to 18.8 {+-} 0.5 ms and delay times increased from 3.6 {+-} 0.3 ms to 8.0 {+-} 0.3 ms with the increase in k{sub eff}. The delay time decreased from 9.1 {+-} 0.3 ms to 7.4 {+-} 0.3 ms during the decrease in the initial period of the pulse. A series of pulses was also run to measure the spatial effects on the pulse in a critical core. A one-energy group point-reactor kinetics model was successfully used to describe the behavior of the system. The transient coupling coefficient between the two reactors in this model was described by a constant factor with a time displacement, which was the pulse propagation time through the connecting thermal column. The parameters found from this model agree well with those previously calculated in other studies by Miley and Doshi or those measured in the steady state. Additional models for spatial effects and for a time-dependent coupling coefficient in the transient mode were tested with the data. (author)« less" @default.
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• W1509623003 date "1974-07-01" @default.
• W1509623003 modified "2023-09-25" @default.
• W1509623003 title "Experiments utilizing two coupled TRIGA-type reactors" @default.
• W1509623003 hasPublicationYear "1974" @default.
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