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 16 of 16 for “"fuel pellets"”.
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Design and development of an automated pellet inspection system for nuclear fuel pellets
… inspection of uranium dioxide (UO2) fuel pellets at production speeds of two pellets per second is presented. The system tests the surface of each cylindrical ceramic pellet using three different methods: laser 2D profile, laser surface roughness, and machine vision camera. The …
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Production, characterisation and economic validation of fuel pellets from Cassia Tora (Tafas in hausa language) for domestic and industrial applications
… A laboratory scale method was used to produce pellets from cassia tora stems with pelletizing temperature conditions of 30, 45, 60, 75, 90, 105 and 120oC under a pressure of 50, 70, 90,120 and 140 MPa. A total of 30 pellets were produced under each condition of production. The physical and …
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An improved structural mechanics model for the FRAPCON nuclear fuel performance code
… Interaction (PCMI) for the FRAPCON nuclear fuel performance code, a new model, the FRAPCON Radial-Axial Soft Pellet (FRASP) model, was developed. This new model uses 1.5D structural mechanics to represent both the fuel pellet and cladding along with their interaction via interfacial forces. …
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MULTI-PHYSICS DESIGN AND ANALYSES OF LONG LIFE REACTORS FOR LUNAR OUTPOSTS
… the amount of highly enriched uranium (HEU) fuel in the core or by improving the neutron economy in the reactor through reducing neutron leakage and parasitic absorption. The amount of fuel in surface power reactors is constrained by the launch safety requirements. These include ensuring that …
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Torrefied-Hydrochar Blend Wood Biomass Improvement for Fuel Pellet Production: A Tree-to-Customer Analysis
… investigation of the economic feasibility of biofuel pellet production in Maine in the United States for sale in the United Kingdom. This work focuses on wood biomass improvement using dry torrefaction in combination with a hydrothermal carbonization (HTC) binder made from the same feedstock for …
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Heat transfer in vertical concentric cylinders in a high level nuclear waste repository
… temperature of the zirconium cladding on the fuel pellets can be determined.
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Evaluating the use of renewable fuel sources to heat flue-cured tobacco barns
… to explore options for the use of renewable fuels for heating tobacco barns. A two-year study conducted at the Virginia Tech Southern Piedmont Center evaluated the effectiveness and cost of curing flue-cured tobacco with a wood pellet burner. Additionally, field studies were conducted to …
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Developing a thermodynamic model for the U-Pd-Rh-Ru quaternary system for use in the modelling of nuclear fuel
… and palladium are fission products in nuclear fuels. These elements and their compounds change the properties of fuel pellets. Phase diagrams involving uranium have been constructed experimentally to study fission product behaviour, specifically diagrams containing the very stable UMe3 (where …
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Conceptual design of an annular-fueled superheat boiling water reactor
The conceptual design of an annular-fueled superheat boiling water reactor (ASBWR) is outlined. The proposed design, ASBWR, combines the boiler and superheater regions into one fuel assembly. This ensures good neutron moderation throughout the reactor core. A single fuel design is used in the core. …
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An assessment of silicon carbide as a cladding material for light water reactors
… and performance of a novel silicon carbide-based fuel rod cladding under PWR conditions was conducted. The novel design is a triplex, with the inner and outermost layers consisting of monolithic SiC, while the middle layer consists of a SiC fiberwound composite. The goal of this work was …
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Safety of light water reactor fuel with silicon carbide cladding
… of the performance of light water reactor (LWR) fuel rod with triplex silicon carbide (SiC) cladding - an emerging option to replace the zirconium alloy cladding - are assessed. Its behavior under accident conditions is examined with an integrated approach of experiments, modeling, and …
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High temperature steam oxidation of titanium-coated Zircaloy-2 and Titanium-Zirconium Alloys
… of high temperature steam and the Zircaloy fuel cladding within the reactor during a Loss-of -Coolant Accident (LOCA). The hydrogen, which collected in the reactor vessel and containment buildings, caused devastating hydrogen gas explosions which lead to the release of radioactive isotopes …
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Fuel failure detection, characterisation and modelling : effect on radionuclide behaviour in PWR primary coolant = Detección, caracterización y modelización de los defectos de las varillas de combustible y su efecto en el comportamiento primario de los reactores PWR
… actinide behavior in PWR primary coolant. From fuel pellets to plant waste, it is extremely important to monitor radionuclide behavior in order to determine as precisely as possible the radionuclide inventory, which can have a radiological impact. The presence of fuel cladding defects involves …
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Integridad estructural de vainas de combustible nuclear en condiciones de almacenamiento temporal en seco
… y absolutamente original. ABSTRACT The nuclear fuel pellets and the fission products are contained in thin-walled zirconium tubes, known as nuclear fuel cladding. The effect of the hydrogen content on the mechanical properties and fracture behaviour of nuclear fuel cladding was studied in this …
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Thermal Performance of Duplex Fuel
Made available in DSpace on 2017-07-06T18:49:09Z (GMT). No. of bitstreams: 3 Lam_Annie_W_MS.pdf: 51217607 bytes, checksum: db4c3fb2ab28998dbbe44adf22698e6e (MD5) Lam_Annie_W_MS_ABS.pdf: 584994 bytes, checksum: abbec9ad3276c16036d320cd605427de (MD5) license.txt: 4813 bytes, checksum: …
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Economic and fuel-performance analysis of extended operating cycles in existing light water reactors (LWRs)
… factors are broken into 2 basic categories, Fuel Cycle Economic Factors and Operations and Maintenance (O&M) Economic Factors. Results are evaluated relative to current practice: 18 calendar month cycles refueling 72 of 193 assemblies each shutdown for the case study PWR and 24 month cycles …