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Showing 1 to 20 of 33 for “"CRUD"”.
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CRUD resistant fuel cladding materials
CRUD is a term commonly used to describe deposited corrosion products that form on the surface of fuel cladding rods during the operation of Pressurized Water Reactors (PWR). CRUD has deleterious effects on reactor operation and currently, there is no effective way to mitigate its formation. The …
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A study of solute transport of radiolysis products in crud and its effects on crud growth on PWR fuel pin
… of radiolysis species (H2, O2, and H2O2) upon crud deposition and growth and also the effect of their concentration within the crud. A 3-D transient diffusion model has been developed to simulate solute transport of these radiolysis products in porous crud layer. It attempts to explain the …
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The Modeling of Crud Buildup in Nuclear Power Plants
Made available in DSpace on 2017-07-06T18:48:54Z (GMT). No. of bitstreams: 3 Kapinus_David_M_MS.pdf: 32618889 bytes, checksum: f50bc8a369dfa5210df24b7e6f05827d (MD5) Kapinus_David_M_MS_ABS.pdf: 390541 bytes, checksum: d133d64b1fcf3a91c7de3c03c4c4f1ba (MD5) license.txt: 4813 bytes, checksum: …
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Characterization and mitigation of crud at pressurized water reactor conditions
… on fuel rods in nuclear reactors, known as crud, can cause a variety of undesirable effects including axial power shifts, accelerated corrosion, increased primary circuit radiation dose, and possible fuel failure. This study revisits the crud problem once again using a newly constructed …
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Controlling CRUD vapor chimney formation in LWRs through surface modification
… ship hulls. In nuclear power plants, buildup of CRUD can accelerate corrosion, increase pressure drops, cause axial power shifts, and increase radiation dose to workers. In this experiment, we studied the effect of induced microcavity and micropost patterns on CRUD morphology at atmospheric …
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Numerical multiphysics modelling of Wick-Boiling in a crud with porosity variations to determine local Nickel Ferrite depositions within crud due to deep bed filtration
… Local Nickel Ferrite absorption within the crud is estimated using this model and results obtained from Particle Assembly/Constrained Expansion (PACE) models. The rate of absorption of these particles is hugely affected by the non-uniformity of the porous deposits. The estimated values …
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The Crud Problem in LWRs - Feasibility Study to Characterize Corrosion Products
Made available in DSpace on 2017-07-06T18:48:28Z (GMT). No. of bitstreams: 3 Hilley_James_R_Jr_MS.pdf: 35176099 bytes, checksum: 3f820ac21218f9394d63f15e10645660 (MD5) Hilley_James_R_Jr_MS_ABS.pdf: 473032 bytes, checksum: 5dc7d44222c323a0342bbeb6b73ba82f (MD5) license.txt: 4813 bytes, checksum: …
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Simulation of the CRUD formation process using the Lattice Boltzmann Method
… present work is to describe the fundamentals in CRUD formation, transport, and deposition, in order to provide a theoretical basis for evaluating and analysing any fuel operational problem due to CRUD deposits. A Lattice Boltzmann Method model is proposed for simulating thermal hydraulic and …
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Synthesis of CRUD and its effects on pool and subcooled flow boiling
… dedicated to studying the effects of synthetic CRUD (Chalk River Unidentified Deposits) on pool and subcooled flow boiling parameters. Previous pool boiling studies have demonstrated the potential of porous, hydrophilic surfaces to lead to more efficient boiling. CRUD is a naturally occurring …
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A numerical study on parameters affecting boric acid transport and chemistry within fuel corrosion deposits during crud induced power shift
Crud buildup within Pressurized Water Reactors with or without power uprates has led to axially downward shift in power production. This shift in power has been defined as Axial Offset Anomaly (AOA). Boric acid, which is used as a soluble neutron absorber in PWRs, has been identified as the chief …
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Quantifying the fouling resistance of Accident-Tolerant Fuel (ATF) cladding coatings with force spectroscopy
CRUD (Chalk River Unidentified Deposits) is buildup of metal oxides on the interior of nuclear reactors. This is caused by corrosion in reactor internals, leading to problems such as coolant contamination in porous deposits left by CRUD. CRUD has forced many nuclear reactors into temporary shutdown …
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Studey of a Water Radiolysis Effects on Transport of Solute and Related Chemical Reactions in Porous Crud
Made available in DSpace on 2017-07-06T18:48:51Z (GMT). No. of bitstreams: 3 Joe_Hyun-Jong_MS.pdf: 44574003 bytes, checksum: 7ccfa9d0a0232c245e192c895460b3ea (MD5) Joe_Hyun-Jong_MS_ABS.pdf: 655865 bytes, checksum: 0db64d945e24b8a555cba499bef50a70 (MD5) license.txt: 4813 bytes, checksum: …
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Multiphysics modeling of activity transport and evolution of CRUD and steam generator oxides in pressurized water reactors
… of corrosion products on fuel cladding, known as crud, in the core of light water reactors can cause a variety of operational issues. Buildup of radioactive crud and corrosion products on ex-core structures, such as steam generators and piping, can cause increased radiation fields and higher dose …
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Comparative Analysis of Source Term Removal at Cook Nuclear Plant
… Specialty resin was employed to remove Cobalt-60 CRUD and other contaminates from the primary coolant piping and fuel cladding. Cook is a two unit Ice Condenser Pressurized Water Reactor (Westinghouse). Unit 1 has completed 22 cycles and refueling outages and Unit 2 has completed 18 cycles and …
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Hydrogen entry in Zircaloy-4 fuel cladding : an electrochemical study
… was used to understand effects of radiolysis and CRUD. Density functional theory (DFT) was used to investigate the role of oxidized Zr(Fe,Cr)2 second phase particles. Chemical potentials and the electron chemical potential were used to connect these two modeling efforts. A radiolysis model was …
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Understanding the Impact of Nuclear Environment on the Hydrothermal Corrosion in SIC
… surface roughness, surface wettability, and CRUD (metallic oxide impurities) deposition. The corrosion rate in the irradiated microstructures was found to be an order of magnitude higher compared to the unirradiated microstructure under boiling water reactor (BWR) conditions. Electrochemical …
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Design of Fouling-Resistant Coatings for Energy Systems: Theory and Proof of Principle at Realistic Conditions
… of corrosion deposits, known as fouling or CRUD in PWRs, seriously hinders large-scale energy production. From nuclear power plants to geothermal reservoirs, fouling increases system pressure drops, impedes heat transfer, and accelerates corrosion, leading to derating and early failure. Here …
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LDConnect - a SoLiD compliant interface for the Facebook social graph
… vice-a-versa makes it easy for developers to run CRUD applications on Facebook elements using the same access methods they would use to access Crosscloud backends.
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Klient pro správu požadavků
… klient umožňující provádění základních CRUD operací nad požadavky. Funkčnost byla ověřena na reálných datech prostřednictvím OSLC adaptéru, přičemž důraz byl kladen na správnou práci s RDF daty a podporu filtrování výsledků. Výsledkem práce je nástroj využitelný jako základ pro integraci …
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On the use of high performance annular fuel in PWRs
… effect of inner channel flow restrictions due to crud buildup and obstructions, and the economic impact of a fleet of reactors using high burnup annular fuel. All of the work was done using computer codes specializing in core neutronics, thermal hydraulics, and fuel cycle analysis. The reduced …
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