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 20 of 196 for “"LEU+"”.
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LEU+ to HALEU nuclear fuel cycle transitions and dynamic reactor models
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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CFD in support of development and optimization of the MIT LEU fuel element design
… effect of lateral power distribution of the MITR LEU fuel design was analyzed using Computational Fluid Dynamics. Coupled conduction and convective heat transfer were modeled for uniform and non-uniform lateral power distributions. It was concluded that, due to conduction, the maximum heat flux …
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Friction pressure drop measurements and flow distribution analysis for LEU conversion study of MIT Research Reactor
… on the conversion to low-enriched uranium (LEU) fuel at the MITR, together with the supporting thermal hydraulic analyses, propose different fuel element designs for optimization of thermal hydraulic performance of the LEU core. Since proposed fuel design has a smaller coolant channel height …
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LEU+ Fuel Cycle Investigation of the BWRX-300 Design Using Neutronic and Two-Phase Thermal Hydraulic Analyses
… focus on utilizing low enriched uranium plus (LEU+) fuel to further improve the cycle length and subsequent economics of the current fleet of reactors and other PWR concepts ([1], [2]). These considerations and trends justify the need for current research on adopting LEU+ for the BWRX-300 …
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Maximum hypothetical accident analysis for HEU to LEU fuel conversion at the University of Missouri Research Reactor
… fuel to 19.75% low-enrichment uranium (LEU) U-Mo monolithic fuel. Under chapter 13 of NUREG-1573, MURR must perform several safety analyses, one of which was the maximum hypothetical accident (MHA) analysis. For the 10-minute dose to workers in containment, a committed effective dose …
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Estimate of radiation release from MIT reactor with low enriched uranium (LEU) core during maximum hypothetical accident
… enriched uranium (HEU) to low enriched uranium (LEU) for fuel. A component of the conversion analysis includes calculating the maximum hypothetical accident (MHA) dose implications for the two types of fuel. In this work, the dose levels at the site exclusion area boundary were calculated for the …
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Evaluation of the thermal-hydraulic operating limits of the HEU-LEU transition cores for the MIT Research Reactor
… Uranium (HEU) fuel to Low Enrichment Uranium (LEU) fuel. The currently selected LEU fuel design contains 18 plates per element, compared to the existing HEU design of 15 plates per element. A transitional conversion strategy, which consists of replacing three HEU elements with fresh LEU fuel …
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Thermal hydraulics analysis of the MIT research reactor in support of a low enrichment uranium (LEU) core conversion
… uranium (HEU) core to a low enrichment uranium (LEU) core using a high-density monolithic UMo fuel. The design of an optimum LEU core for the MIT reactor is evolving. The objectives of this study are to benchmark the in-house computer code for the MITR, and to perform the thermal hydraulic …
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LEU-HEU Mixed Core Conversion Thermal-hydraulic Analysis and Coolant System Upgrade Assessment for the MIT Research Reactor
… uranium (HEU) fuel to the low enriched uranium (LEU, <20%-enriched U-235) fuel, as part of the global non-proliferation initiatives. A high-density, monolithic uraniummolybdenum (U-10Mo) fuel matrix is chosen. The fuel element design is changed from 15-plate finned HEU fuel to 19-plate unfinned …
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Expanding and optimizing fuel management and data analysis capabilities of MCODE-FM in support of MIT research reactor (MITR-II) LEU conversion
… enriched Uranium (HEU) to low enriched Uranium (LEU), as required by recent non-proliferation policy. With the same core configuration and similar assembly type, high-density monolithic U-Mo fuel will replace the current HEU fuel with comparable performance. Part of the required analysis for …
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Development of a core design optimization tool and analysis in support of the planned LEU conversion of the MIT Research Reactor (MITR-II)
… enriched uranium (HEU) to low enriched uranium (LEU), as part of a global effort to minimize the availability of weapons-grade uranium. In support of efficient fuel management analysis with the new LEU fuel, a core design optimization tool has been developed. Using a coarse model, the tool can …
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Excess leucine in diets for growing pigs negatively affects growth performance, nitrogen balance, and metabolism of branched-chain amino acids and tryptophan
… to determine the effects of excess dietary Leu on metabolism of branched-chain amino acids (BCAA) and to demonstrate the interactions among BCAA and Trp in diets fed to growing pigs. In experiment 1, the objective was to determine the effects of excess dietary Leu on growth performance, N …
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The Effects of Exercise and Dietary Protein on Leucine Oxidation in Laboratory Rats
… of the essential branched-chain amino acid, leucine (leu), increases in response to exercise. The purpose of this thesis was to investigate the effects of exercise and dietary protein on leu metabolism by measuring in vivo leu oxidation (leu ox) and in vitro branched-chain alpha-keto acid …
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Loss-of-flow analysis of an unfinned, graded fuel meat, LEU monolithic U-10Mo fuel design in support of the MITR-II fuel conversion
… uranium (HEU) fuel to the low-enriched uranium (LEU, <20% 235U) fuel. This reduction in enrichment decreases the neutron flux level due to parasitic absorption by 238U. The neutron flux may be compensated for by increasing the reactor's nominal operating power level to 7.0 MW. Thus a neutronic …
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Study of turbulent single-phase heat transfer and onset of nucleate boiling in high aspect ratio mini-channels to support the MITR LEU conversion/
Heat transfer in high aspect ratio mini-channels has important applications for materials test reactors using plate-type fuel. These fuel plates typically possess coolant channels with hydraulic diameters on the order of 4 mm or less. The single and two-phase heat transfer in such channels has not …
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Examination of the conversion of the U.S. submarine fleet from highly enriched uranium to low enriched uranium
… warrant a fresh look at low enriched uranium (LEU). Evidence suggests that the mission space of the submarine force might be changing in such a way to relax previous constraints that made LEU cores more challenging. Estimates show that high density fuels can produce LEU core sizes that are …
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Protein quality and distribution determines anabolic signaling, cellular energetics, and body composition
… complex. Consumption of the amino acid leucine (Leu) is a key factor determining the anabolic response of muscle protein synthesis (MPS) and mTORC1 signaling to a meal. Research from this dissertation demonstrates that the peak activation of MPS following a complete meal is proportional …
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The acute effects of l-Leucine and l-Isoleucine on glycemic responses in healthy and inactive adults
… the “priming” effect of pre-ingested L-Isoleucine (ISO) and L-Leucine (LEU) on glucose metabolism and glycemic hormones in healthy, inactive adults. We hypothesized that preingested ISO and LEU would diminish the post prandial rise in glucose prior to a 75 g oral glucose tolerance test …
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Effects of Leucine on Skeletal Muscle During 14 d Bed Rest in Middle-aged Adults
… acutely ill patients. The essential amino acid leucine has been shown to acutely stimulate muscle protein synthesis (MPS), a decrease in which mechanistically drives inactivity-induced losses in muscle. This study evaluated the effects of leucine supplementation (0.06 g • kg • meal-1; LEU) with …
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Purification of Two Myosin -Degrading Proteases From Porcine Skeletal Muscle
… soybean trypsin inhibitor, antipain, leupeptin and beta-mercaptoethanol, but not altered by E-64, pepstatin, or EDTA. Using radiolabeled DFP, a protein with Mr 32,000 was identified on an SDS gel as a DFP-binding protein, which was either the serine protease or a catalytic subunit …
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