Last edited by Mosar
Tuesday, August 4, 2020 | History

2 edition of Thorium Diffusion in Thoria and Urania. found in the catalog.

Thorium Diffusion in Thoria and Urania.

Atomic Energy of Canada Limited.

Thorium Diffusion in Thoria and Urania.

by Atomic Energy of Canada Limited.

  • 398 Want to read
  • 21 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesAtomic Energy of Canada Limited. AECL -- 3655
ContributionsKing, A.D.
ID Numbers
Open LibraryOL21971644M

@article{osti_, title = {Aqueous Dissolution of Urania-Thoria Nuclear Fuel}, author = {Demkowicz, Paul A and Jerden, Jr, James L and Cunnane, James C and Shibuya, Noriko and Baney, Ronald and Tulenko, James}, abstractNote = {The aqueous dissolution of irradiated and unirradiated uranium-thorium dioxide, (U,Th)O{sub 2}, fuel pellets in Yucca Mountain well water has been . This book is introduced with a brief overview of worldwide efforts and recent outlook on the use of thoria-based fuels for power generation. It also summarizes the merits of thoria-based fuels, issues in the thorium fuel cycle, and the past to present accounts of work on the fuels.

Postirradiation annealing tests were performed to obtain the Xe diffusion coefficients in uranium dioxide (UO 2) and mixed thorium-uranium dioxide [(Th-U)O 2] ens were a single-grained UO 2, a polycrystalline UO 2, and a polycrystalline (Th-U)O (Th-U)O 2 specimen was a mixture of 35% ThO 2 and 65% UO mg specimen was irradiated to a burnup of MWd/t U. India is one of the few countries committed to expansion of nuclear power. In view of the abundance of thorium relative to uranium, thorium cycle is under serious development and implementation. Both ThO2 and (U,Th)O2 are used. Fine powders of the same are mostly prepared through the aqueous chemical route, pressed and sintered. Extrusion and hot impact densification are also being used.

  Whereas thorium is a fertile material, it is not fissile and therefore a sustained conversion to the fissile U isotope can only occur in the presence of a neutron source. Although plutonium may serve as the source, there are several advantages to blending thoria with urania that have been confirmed experimentally, including changes in the decay heat, melting point, and thermal conductivity. Get this from a library! Thoria-based nuclear fuels: thermophysical and thermodynamic properties, fabrication, reprocessing, and waste management. [Dasarathi Das; S R Bharadwaj;] -- This book presents the state of the art on thermophysical and thermochemical properties, fabrication methodologies, irradiation behaviours, fuel reprocessing procedures, and aspects of waste.


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Thorium Diffusion in Thoria and Urania by Atomic Energy of Canada Limited. Download PDF EPUB FB2

THORIUM DIFFUSION IN THORIA AND URANIA A.D. King Materials Science Branch Chalk River Nuclear Laboratories CHALK RIVER, Ontario, Canada ABSTRACT Techniques are described for the measurement of diffusion in ThO2 and U02«Results are presented for single crystal ThO2 in the range to °C and single crystal UO2 at °c.

Thorium however only exhibits one oxidation state (+4) and hence cannot be oxidized beyond ThO 2, which means the chemical diffusion of oxygen is solely due to the presence of urania. In defective thoria-based nuclear fuel elements (or pins) the urania component of the fuel can oxidize in the steam environment [ 4 ] leading to oxygen : Aaron D.

Quastel, Catherine M. Thiriet. THORIA-URANIA FUELS FOR THE ADVANCED HEAVY WATER REACTOR M. Ali, R. Mishra and D. Das Chemistry Division Introduction Over the last thirty years there has been increased interest in utilizing thorium as nuclear fuel, primarily because, this potential actinide is three times more abundant in the earth’s crust.

Many countries, particularly. Thoria has less grain growth when compared to similarly powered urania. • Diffusion of fission products within a thoria fuel matrix is lower than for urania [4,5]. • Fuel oxidation does not occur in thoria, as ThO 2 is the highest oxidation state of thorium (whereas urania can become hyper-stoichiometric and/or reach higher oxidation Cited by: 1.

1. Introduction. Thorium is an available fuel material as well as uranium and plutonium. And thorium-based fuels have some advantages: thorium as the alternative of the uranium resources exists richly in nature; the amount of long-lived actinides, e.g., Np (T 1/2 = × 10 6 y), generated in the fuel cycle is small.

Oxygen to metal ratio (O/M) has a strong effect on the physical and Cited by: 6. High temperature thermochemistry of thoria–urania fuel for Advanced Heavy Water Reactor was investigated. Oxygen potential development within the matrix and distribution behaviors of the fission products (fps) in different phases were worked out with the help of thermodynamic and transport properties of the fps as well as fission generated oxygen and the detailed balance of the.

One special feature is the inclusion of the latest information on thoria-based fuels, especially on the use of thorium in power generation, as it has less proliferation potential for nuclear weapons.

Given its natural abundance, thorium offers a future alternative to uranium fuels in nuclear technology. The power distribution of the thoria and urania fuel was calculated using a neutronics code MOCUP. Due to the lower build-up of Pu (less U in ThO₂-UO₂ fuel) and flatter distribution of U (less resonance capture in Th), thoria fuel experiences a much flatter power distribution and thus has a less severe rim effect than UO₂.

The power distribution of the thoria and urania fuel was calculated using a neutronics code MOCUP. Due to the lower build-up of Pu (less U in ThO[subscript 2]-UO[subscript 2] fuel) and flatter distribution of U (less resonance capture in Th), thoria fuel experiences a much flatter power distribution and thus has a less severe.

This book presents the state of the art on thermophysical and thermochemical properties, fabrication methodologies, irradiation behaviours, fuel reprocessing procedures, and aspects of waste management for oxide fuels in general and for thoria-based fuels in particular. The book covers all the essential features involved in the development of.

Request PDF | Chemical diffusion of oxygen in thoria–urania solid solution | The chemical diffusion coefficients of oxygen were measured for the (Th1−y, Uy)O2+x with uranium content y of 1, 3. Thorium dioxide (ThO 2), also called thorium(IV) oxide, is a crystalline solid, often white or yellow in known as thoria, it is produced mainly as a by-product of lanthanide and uranium production.

Thorianite is the name of the mineralogical form of thorium dioxide. It is moderately rare and crystallizes in an isometric system. The melting point of thorium oxide is °C – the.

These models could predict the degree of hypostoichiometry of thoria-plutonia fuel sintered in a hydrogen atmosphere. Alternatively, the model may be used to predict the defect behavior of freshly inserted thoria-based fuel with a cladding breach.

The degree of oxidation of thoria-urania fuel could be calculated when contacted by coolant. Diffusion properties of the volatile fission products iodine and tellurium inside the thoria based fuel matrix (ThO mol% UO2) were obtained by studying the release kinetics of the species from.

The study of thorium dioxide/thoria ThO 2-based fuel irradiation behavior is significantly less advanced than that of uranium dioxide (UO 2) fuel, although ThO 2 possesses superior thermal conductivity, thermal expansion, higher melting temperature, and oxidation resistance that may improve both fuel performance and safety.

Transport and release behaviors of I and Te in trace irradiated ($5 Â 10 20 fission m À3) thoria-2 mol% urania with and without doping of fps were studied in this laboratory [53, Abstract. Thoria–urania (ThO 2 –UO 2)-based fuel system is the proposed fuel for the Advanced Heavy Water Reactor (AHWR) in a part of thoria-based fuel development for India’s nuclear power programme, thoria–urania (ThO 2 –UO 2) solid solutions were prepared by Coated Agglomerate Pelletization (CAP) process which has many advantages over conventional powder pellet route for.

Results from experiments (Demkowicz et al., ) concerning the aqueous dissolution of irradiated thoria–urania LWR fuel pellets in Yucca Mountain well water have demonstrated that (U,Th)O 2. Part of the Green Energy and Technology book series (GREEN) Abstract Shiba K () Diffusion processes in thoria and thorium based oxides.

In: Agarwala RP (ed) Diffusion processes in nuclear materials. Olander DR () Lattice and grain boundary diffusion in polycrystalline thoria-urania.

J Nucl Mater – CrossRef Google. Combustion synthesis of urania–thoria solid solutions Article in Journal of Nuclear Materials (2) April with 59 Reads How we measure 'reads'.

Fischer DF, Fink JK, Leibowitz L, Belle J () Enthalpies of thoria–urania from to K. J Nucl Mater CrossRef Google Scholar Young RA () Model for the electronic contribution to the thermal and transport properties of ThO 2.

@article{osti_, title = {Properties of thoria and thoria-urania: a review (LWBR Development Program)}, author = {Belle, J.

and Berman, R. M.}, abstractNote = {Information on the physical, chemical, and mechanical properties of thoria and thoria-urania is reviewed and assessed.

The properties discussed are those judged to be important for an understanding of the behavior of these oxides.X-RAY DIFFRACTION STUDY OF THE FORMATION OF SOLID SOLUTIONS IN URANIA- THORIA PREPARED BY AQUEOUS CHEMICAL PROCESSES Nelson Batista The uranium-thorium compounds obtained by the two processes were calcined, followed by continuous diffusion coefficient D and the average sum of the square of the individual jumps x2, P.