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Rubina Nasir,Faiza Aziz,Sikander M. Mirza,Nasir M. Mirza 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.3
Experimental measurements of the response of BF3 detector to a 3 Ci AmeBe neutron source for threedifferent reflecting materials, i.e., aluminum, wood, and Perspex of varying thicknesses have been carriedout. The varying contribution of wall effect to the response due to change in active volume of the detectorhas also been determined experimentally. Then, a Monte Carlo code has been developed for the calculationof the neutron response function of the BF3 detector using source biasing and importance sampling. This code simulates the BF3 detector response exposed to the neutron field in a three-dimensionalsource, detector, and reflecting medium configurations. The results of simulation have been comparedwith the corresponding experimental measurements and are found to be in good agreement. Theexperimental neutron albedo measurements for various values of Perspex thickness show saturatingbehavior, and results agree very well with the data obtained by Monte Carlo simulation.
Rubina Nasir,Sikander M. Mirza,Nasir M. Mirza 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.4
This work looks at the effect of changes in kinetic parameters on simultaneous reactivityinsertions and beam tube flooding in a typical material testing reactor-type researchreactor with low enriched high density (U3Si2-Al) fuel. Using a modified PARET code,various ramp reactivity insertions (from $0.1/0.5 s to $1.3/0.5 s) plus beam tube flooding($0.5/0.25 s) accidents under uncontrolled conditions were analyzed to find their effects onpeak power, net reactivity, and temperature. Then, the effects of changes in kinetic parametersincluding the Doppler coefficient, prompt neutron lifetime, and delayed neutronfractions on simultaneous reactivity insertion and beam tube flooding accidents wereanalyzed. Results show that the power peak values are significantly sensitive to theDoppler coefficient of the system in coupled accidents. The material testing reactor-typesystem under such a coupled accident is not very sensitive to changes in the promptneutron life time; the core under such a coupled transient is not very sensitive to changesin the effective delayed neutron fraction.