Whole-body magnetic resonance (MR) images were obtained, and contours of 15 organs (brain, eye, gall bladder, heart, kidney, liver, lung, pancreas, stomach, spleen, testes, thymus, thyroid, urinary bladder and uterus) and 9 bones (femur, tibia + fibula, humerus, radius + ulna, pelvis, cervical spine, thoracic and lumber spine, skull and clavicle) were segmented for organ volume rendering by anatomists using commercial software. A total of 121 healthy volunteers (66 males and 55 females), whose body dimensions were close to that of average Korean adults, were recruited for this study. These specifications were obtained using fuel percentage composition of U-232 as much as 10 13% and Pa-231 as much as 9.36 16.01%.In vivo organ mass of the Korean adult, male and female were presented for the purpose of radiation protection. The optimized design resulted in boiling water reactor with active volume 5,193.034 liter, power 182 MWt, operation time 28 years and maximum excess reactivity 0,56% dk/k. This paper describes the effect of addition of Pa-231 towards excess reactivity and operation time. Protactinium, Pa, was a nuclide which has the same characteristic such standard BP materials. Besides, they could left poison residue as few as they can in the end of fuel cycle. BP materials could absorb faster from fuel burn up because they have high cross section capture. In order to handle this safety consideration without increase control mechanically, there was possible to add burnable poison (BP) materials.
On the other hand, regarding the previous study [, neutronic performance of Thorium utilization as nuclear fuelwithout burnable poison materials additionyielded high excess reactivity. Thorium has several good neutronic properties so that could provide higher capacity factor, more stable and insoluble, very resistant to weapon-material proliferation, and more cost effective.
Thorium has a possibility as alternative nuclear reactor fuel.
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