report Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. is part of the collection entitled: So far, there Singlecrystals of UO2 display increasing heat transfer rates at temperaturesabove 700 C, probably as a result of contributions by radiation and otherenergy transfer mechanisms.Irradiation of sintered UO2 at less than 100 C causes a decreasein thermal conductivity to 50% or less of its nonirradiated value near roomtemperature. At 648 K the thermal conductivity is 4.9 W/m.K. image files https://digital.library.unt.edu/ark:/67531/metadc100610/m1/4/. Basic information for referencing this web page. September 1962. thermal conductivity than that of UO2. This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. Thermal Conductivity of UO2, accessed November 27, 2020), Note: Results may vary based on the legibility of text within the document. Thermal conductivity of solid UO 2 with a density of 95% is estimated by following correlation [Klimenko; Zorin]: where τ = T/1000. Descriptive information to help identify this report. |. was provided to UNT Digital Library as a primary source within our collections. The thermal conductivity peaks between 200 and 250 K and decreases for decreasing temperatures. Thus, the formation of bubbles defects might seriously affect thermal properties of the nuclear fuel, and understanding correlation between effective thermal conductivity and temporal distribution of the imperfections is a quite important task. It has been viewed 423 times, with 6 in the last month. Some reports include maps, foldouts, blueprints, and other oversize materials. Report discussing the thermal conductivity of uranium dioxide. Variations in fabricationconditions can result in wide differences in thermal conductivity. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. crediting UNT Libraries Government Documents Department. Thus, the formation of bubbles defects might seriously affect thermal properties of the nuclear fuel, and understanding correlation between effective thermal conductivity and temporal distribution of the imperfections is a quite important task. extended guidance on usage rights, references, copying or embedding. 2. Thermal Conductivity of UO2 One of 759 reports in the series: AEC research and development report available on this site. What responsibilities do I have when using this report? report United States. to the We also provide and Daniel, J. L.; Matolich, J., Jr. & Deem, H. W. University of North Texas Libraries, UNT Digital Library, Technical Report Archive and Image Library, Brightness, Contrast, etc. People and organizations associated with either the creation of this report or its content. Daniel, J. L.; Matolich, J., Jr. & Deem, H. W. a digital repository hosted by the These controls are experimental and have not yet been optimized for user experience. A gateway to rare, historical, and primary source materials from or about Texas. Department of Commerce. This report is part of the following collection of related materials. A gateway to rare, historical, and primary source materials from or about Texas. Office of Technical Services. September 1962; Links and search tools for all of the collections and resources available from UNT. Above 1000 C, no significant influence of irradiation onsintered polycrystalline UO2 has been observed. (https://digital.library.unt.edu/ark:/67531/metadc100610/: For UO2, the thermal conductivity is found to be 10.2 W/m.K at 323 K and with increasing temperatures its behavior is inversely proportional to the temperature. (https://digital.library.unt.edu/ark:/67531/metadc100610/m1/4/: report, This We've identified this accessed November 27, 2020), The thermal conductivity is one of parameters, which determine the fuel centerline temperature. by the UNT Libraries Government Documents Department. So far, there Links and search tools for all of the collections and resources available from UNT. Technical Report Archive and Image Library As the temperature is raised, conductivity tends towardthe corresponding nonirradiated values; pronounced stages of "recovery"occur near 150 C and 400 C, and less definitely near 800 C. This thermalannealing coincides with UO2 crystal lattice parameter recovery, andappears to be associated with crystal lattice damage sustained duringirradiation. Daniel, J. L.; Matolich, J., Jr. & Deem, H. W. thermal conductivity than that of UO2. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives. Thermal conductivity has been measured on several types of UO2 specimens, both irradiated and nonirradiated. crediting UNT Libraries Government Documents Department. UNT Digital Library, Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. extended guidance on usage rights, references, copying or embedding. Daniel, J. L.; Matolich, J., Jr. & Deem, H. W. September 1962; is part of the collection entitled: Helpful links in machine-readable formats. Washington D.C.. More information about this report can be viewed below. (Experimental). report, University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; Daniel, J. L.; Matolich, J., Jr. & Deem, H. W. University of North Texas Libraries, UNT Digital Library, Technical Report Archive and Image Library. UNT Libraries Government Documents Department, Page: Technical Report Archive and Image Library and was provided by the UNT Libraries Government Documents Department The technique yielded results with a probable accuracy of ±1.5% and a precision of ±0.1% in the range 50° to 1100°C. Thermal Conductivity of UO2, The thermal conductivity of unirradiated UO2 is 10.2 W/m.K at 323 K and scales with temperature like 1/T. Highdensity, nonsintered, crystal compacts have a low, nearly temperature-independent conductivity while sintered polycrystalline UO2 exhibits typicaldecreasing conductivity inversely proportional to temperature. Get a copy of this page or view the extracted text. Washington D.C.. Variations in fabrication conditions can result in wide differences in thermal conductivity. The first part of the report includes the thermal effects on the substance's physical form, while the second part describes the experimental details. file UNT Libraries Government Documents Department, Ceramics Research, Reactor and Fuels Research and Development, Hanford Laboratories, Instrumentation, Battelle Memorial Institute, Columbus, Ohio, AEC research and development report HW-69945, UC (Series) 25, Metals, Ceramics, and Materials, 55134948