Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"burnable poison"”.
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The use of burnable poison to improve uranium utilization in PWRS
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1982.
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Combining thorium with burnable poison for reactivity control of a very long cycle BWR
… together with gadolinium, erbium, or boron burnable absorber in BWR fuel assemblies for very long cycle is investigated. Nuclear characteristics such as reactivity and power distributions are evaluated using CASMO-4. Without thorium, the results show that gadolinium enriched in Gd-157 has …
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Reactor physics considerations for implementing silicon carbide cladding into a PWR environment
… modeled in CASMO-4E with varying enrichments, burnable poison layouts, and power conditions. Using these assemblies, full core, three-dimensional analyses were performed in SIMULATE-3 for operating conditions similar to the Seabrook Nuclear Power Station. In this study, SiC-clad fuel rods held …
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Application of genetic algorithm and deep reinforcement learning for in-core fuel management
… where fixed number of fuel enrichments and burnable poison distributions are assumed. The algorithms automatically shuffles the assembly positions to find the optimum loading pattern. It is determined that both algorithms are able to successfully start with a poorly performing core loading …
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Micro-heterogeneous thorium based fuel concepts for pressurized water reactions
… certain axially heterogeneous configurations, a "burnable poison" reactivity suppression effect appears at the beginning of irradiation. Analysis of the possible mechanisms behind these effects shows that they are due to a combination of changes in self-shielding, local fissile worth, and …
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Radioisotope Inventory Of Spent Nuclear Fuel In Mathematica
… in the reactor, compensating for fuel burnup, burnable poison burnout, and actinide and fission product buildup. It is shown, as an example, that the fractional reduction in boron concentration after a month of reactor operation is 2.3%. The normalized neutron flux in the example scenario is …
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A one-dimensional fuel burnup model of a PWR
… Xe-135, I-135, Sm-149, Pm-149 and the lumped burnable poison isotope. The flux was approximated by the sum of two trigonometric functions. The magnitude and shape of the flux were determined by holding power constant, constraining system to be critical and varying the soluble boron …
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Reactor physics assessment of thick silicon carbide clad PWR fuels
… to conduct optimization searches of burnable poison layouts and core reload patterns. All fuel/clad combinations have been modeled using 84 assembly reloads, and Thick SiC clad annular U0 2 has been modeled using both 84 and 64 assembly reloads. Dual Binary Swap (DBS) optimization via …
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An Effective Methodology for Thermal-Hydraulics Analysis of a VHTR Core and Fuel Elements
… flow, hotspots may occur at the location of burnable poison rods in the fuel elements, depending on the assumed volumetric heat generation rate in the rods. The helium bleed flow through the control rod channels reduces temperatures near them by 2-5 K, and only slightly increases the …
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The Design of Reactor Cores for Civil Nuclear Marine Propulsion
… studies is that a duplex fuel lattice needs less burnable absorber than uranium-only fuel to achieve the same poison performance. The higher initial reactivity suppression and relatively smaller reactivity swing of the duplex can make the task of reactivity control through BP design in a …