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The Relation Between Microstructure And The Release Of Unstable Fission Products During High Temperature Irradiation Of Uranium Dioxide
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Book Synopsis The Relation Between Microstructure and the Release of Unstable Fission Products During High Temperature Irradiation of Uranium Dioxide by : J. A. Turnbull
Download or read book The Relation Between Microstructure and the Release of Unstable Fission Products During High Temperature Irradiation of Uranium Dioxide written by J. A. Turnbull and published by . This book was released on 1977 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unstable Fission Product Release from UO2 Irradiated at High Temperature by : M. O. Tucker
Download or read book Unstable Fission Product Release from UO2 Irradiated at High Temperature written by M. O. Tucker and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fission Product Distribution in Irradiated UO2 by : J. Lambert Bates
Download or read book Fission Product Distribution in Irradiated UO2 written by J. Lambert Bates and published by . This book was released on 1965 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Release of Cesium from UO2 at Elevated Temperature by : Lena Katrina Hansson
Download or read book Release of Cesium from UO2 at Elevated Temperature written by Lena Katrina Hansson and published by . This book was released on 1986 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructurally Explicit Simulation of the Transport Behavior in Uranium Dioxide by : Harn Chyi Lim
Download or read book Microstructurally Explicit Simulation of the Transport Behavior in Uranium Dioxide written by Harn Chyi Lim and published by . This book was released on 2014 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fission products in nuclear fuel pellets can affect fuel performance as they change the fuel chemistry and structure. The behavior of the fission products and their release mechanisms are important to the operation of a power reactor. Research has shown that fission product release can occur through grain boundary (GB) at low burnups. Early fission gas release models, which assumed spherical grains with no effect of GB diffusion, did not capture the early stage of the release behavior well. In order to understand the phenomenon at low burnup and how it leads to the later release mechanism, a microstructurally explicit model is needed. This dissertation conducted finite element simulations of the transport behavior using 3-D microstructurally explicit models. It looks into the effects of GB character, with emphases on conditions that can lead to enhanced effective diffusion. Moreover, the relationship between temperature and fission product transport is coupled to reflect the high temperature environment. The modeling work began with 3-D microstructure reconstruction for three uranium oxide samples with different oxygen stoichiometry: UO2.00 UO2.06 and UO2.14. The 3-D models were created based on the real microstructure of depleted UO2 samples characterized by Electron Backscattering Diffraction (EBSD) combined with serial sectioning. Mathematical equations on fission gas diffusion and heat conduction were studied and derived to simulate the fission gas transport under GB effect. Verification models showed that 2-D elements can be used to model GBs to reduce the number of elements. The effect of each variable, including fuel stoichiometry, temperature, GB diffusion, triple junction diffusion and GB thermal resistance, is verified, and they are coupled in multi-physics simulations to study the transport of fission gas at different radial location of a fuel pellet. It was demonstrated that the microstructural model can be used to incorporate the effect of different physics to study fission gas transport. The results suggested that the GB effect is the most significant at the edge of fuel pellet where the temperature is the lowest. In the high temperature region, the increase in bulk diffusivity due to excess oxygen diminished the effect of GB diffusion.
Book Synopsis Fission Product Release by the High Temperature Uranium-steam Reaction by : A. J. Scott
Download or read book Fission Product Release by the High Temperature Uranium-steam Reaction written by A. J. Scott and published by . This book was released on 1959 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography on the High Temperature Chemistry and Physics of Materials by :
Download or read book Bibliography on the High Temperature Chemistry and Physics of Materials written by and published by . This book was released on 1978 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Release of Fission Products from Lightly-irradiated UO2+x by : Mehrdad Ali Mansouri
Download or read book Release of Fission Products from Lightly-irradiated UO2+x written by Mehrdad Ali Mansouri and published by . This book was released on 1995 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Release of Unstable Fission Products from UO2 During Irradiation by : M. O. Tucker
Download or read book The Release of Unstable Fission Products from UO2 During Irradiation written by M. O. Tucker and published by . This book was released on 1979 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Release of Volatile Fission Products from Uranium Dioxide by : Dominique Bayen
Download or read book Release of Volatile Fission Products from Uranium Dioxide written by Dominique Bayen and published by . This book was released on 1983 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation-induced Changes in Microstructure by : F. A. Garner
Download or read book Radiation-induced Changes in Microstructure written by F. A. Garner and published by ASTM International. This book was released on 1987 with total page 919 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Release of Volatile Fission Products from Uranium Dioxide by :
Download or read book Release of Volatile Fission Products from Uranium Dioxide written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Post-irradiation anneal experiments have been used to determine the release of iodine and tellurium from lightly irradiated UO2 samples maintained at stoichiometry. The applicability of the equivalent-sphere model of diffusion to release of fission gases has been tested. Diffusion coefficients and activation energies have been evaluated. The diffusion coefficient of 132Te at 1400°C was found to be of an order-of-magnitude larger than that of 131I. This result may be of importance for an understanding of the pellet-cladding interaction and for a better evaluation of the source term for fission-product release under accident conditions. Qualitatively, the influence of the stoichiometry on the release of 133Xe, 131I, and 132Te has been established.
Book Synopsis Fission product release from high burnup fuel during oxidation in air at 950 degrees c by : D. R. Mccracken
Download or read book Fission product release from high burnup fuel during oxidation in air at 950 degrees c written by D. R. Mccracken and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two mechanistically different regimes have been observed during the oxidation of uo2 in air: at temperatures greater than or equal to 800 degrees c, u3o8 forms large crystals which propagate in a front through the underlying u4o9/uo2; at temperatures less than 700 degrees c, one grain of uo2 ultimately gives one or more grains of u3o8. previous experiments (1) indicated that in this latter temperature zone, releases of fission products are low and probably originate from inventory at grain boundaries. the experiments described here at 950 degrees c using high burnup fuel (445, 465 mw.h/kg u) confirm earlier results obtained with low burnup fuel (2) at 920 degrees c: in this temperature zone, 100 percent of the volatile fission products are released when u3o8 is formed by oxidation of uo2 in air. within experimental error, oxidation rates and corresponding release rates are independent of burnup, so that data on oxidation rates obtained using unirradiated pellets can be used to estimate release rates of fission products during oxidation of irradiated fuel. iodine, in the form of i2, is released from the uranium matrix as readily as the noble gases, but subsequently adsorbs in steel pipework thus reducing its volatility in a real system. cs release was also observed. it lagged behind the iodine, ruling out csi as the volatile species.
Book Synopsis Preliminary studies of fission product release from uo2 under oxidising conditions by : D. R. Mccracken
Download or read book Preliminary studies of fission product release from uo2 under oxidising conditions written by D. R. Mccracken and published by . This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fission product release and redistribution was studied during the exposure of uo2 in a zirconium furnace tube to steam and air at temperatures up to 910 degrees c. the fuel fragments had been exposed to less than or equal to 3.11 x 10 sup(18) n/cm sup(2) (0.3 mw.h/kg) at less than or equal to 70 degrees c in the self-serve facility of nrx. under these conditions no diffusion to grain boundaries should have occurred, and fission products should stay randomly scattered throughout the matrix. releases were small, less than or equal to 1.4 percent with only xenon and iodine being significant. the fuel oxidation occurred predominantly at less than or equal to 700 degrees c. at higher temperatures oxidation of the zirconium occurred and protected the fuel from significant high temperature oxidation. the results illustrate that fission gases distributed in the fuel matrix are not released during simple crystallographic re-arrangement. release occurs only when an atomic site or gas bubble is intersected by a crack or dislocation. significantly higher release should be expected under conditions where grain growth occurs. selective traps for fission products performed well and will be further investigated in future studies.
Book Synopsis Irradiation Swelling of Uranium and Uranium Alloys by : Gordon G. Bentle
Download or read book Irradiation Swelling of Uranium and Uranium Alloys written by Gordon G. Bentle and published by . This book was released on 1961 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Relation Between Fission Product Release and Fuel Microstructure in High Burn-up UO2 by : J. A. Turnbull
Download or read book The Relation Between Fission Product Release and Fuel Microstructure in High Burn-up UO2 written by J. A. Turnbull and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
