Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels

Cover of: Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels |

Published by Division of Waste Management, Office of Nuclear Material Safety and Safeguards, U.S. Nuclear Regulatory Commission, Supt. of Docs., U.S. G.P.O. [distributor] in Washington, DC .

Written in English

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  • Spent reactor fuels -- Deterioration.,
  • Radioactive wastes -- Deterioration.

Edition Notes

Book details

Other titlesLong term kinetic effects and colloid formations in dissolution of LWR spent fuels.
StatementT.M. Ahn.
ContributionsU.S. Nuclear Regulatory Commission. Division of Waste Management.
The Physical Object
Paginationviii, 45 p.
Number of Pages45
ID Numbers
Open LibraryOL18095782M

Download Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels

However, long-term, effects may lead to continuous formation of mobile colloids (or complexes). This colloid formation is likely to be driven by deviations from the traditional assumptions, used for equilibrium approaches.

This report reinvestigates matrix dissolution and examines colloid formation. It presents some. Get this from a library. Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels. [T M Ahn; U.S.

Nuclear Regulatory Commission. Division of Waste Management.]. The processes analyzed are condensation, dispersion, and sorption. Colloid formation may lead to significant releases of low-solubility actinides.

However, because there are only limited data available on matrix dissolution, colloid formation, and Cited by: 3. drop/collision/impact, fire, high burnup rim effects, radionuclide migration and diffusion, dissolution • Cladding: embrittlement mechanical failure corrosion: embrittlement, mechanical failure, corrosion.

Long-term Kinetic Effects and Colloid Formation in the Dissolution of LWR Spent-fuel, US Nuclear Regulatory Commission, Washington, DC () NUREG, NRC ADAMS ML Google ScholarAuthor: T.M.

Ahn. Journal of Nuclear Materials () North-Holland Parametric study of LWR spent fuel dissolution kinetics W.J. Gray a, H.R.

Leider b and S.A. Steward b " Pacific Northwest Laboratory (PNL), Richland, WAUSA 0 Lawrence Lwermore National Laboratory (LLNL), Livermore, CAUSA Spent fuel dissolution rates have been measured using a Cited by: The dissolution of SNF and HLW glass was considered with long-term risk informed approach from probabilistic PA in a generic disposal system.

• Radionuclide release is time dependent. Initially, the release rate is higher with more surface area exposed for dissolution. The release rate decreases with time. •Author: Tae M. Ahn. Two possible interactions between radionuclides as colloids and as solute are considered: solute sorption on nonradioactive colloids to form pseudocolloids, and dissolution of radioactive colloids.

If the helium generated during the storage is not retained in the fuel, it will increase the internal fuel rod pressure. The pressure from accumulating helium may compromise the integrity of the fuel rods cladding, especially if there is significant hydrogen embrittlement of the fuel rods' zircaloy cladding 4.

Efficient Noble-Metal-Free Co-NG/TiO 2 Photocatalyst for H 2 Evolution: Synergistic Effect between Single-Atom Co and N-Doped Graphene for Enhanced Photocatalytic Activity. Lanhua Yi* Fujun Lan; Jinge Li; Caixian Zhao*.

Colloid formation may lead to significant releases of low-solubility actinides. However, because there are only limited data available on matrix dissolution, colloid formation, and solubility.

Assignments of the Infrared and Raman Spectra of the 3) Group of [.muCHCH3)Os2(CO)8] and of its d1 and d4 Isotopologs as Models for the Spectra of Such Ethylidene Groups on Metal Surfaces.

Ahn, T., “Long-Term Kinetic Effects and Colloid Formation in the Dissolution of LWR Spent-Fuel,” NUREG, U.S. Nuclear Regulatory Commission, Washington, D.C.,NRC ADAMS ML Ah T H J E L Ti t d T Si l “M d l Ab t ti f W t F D d ti i Alt ti Di l Sit ”Ahn, T., H.

Jung, E.L. Tipton and T. Sippel, “Model Abstraction of Waste Form Degradation in. Dissolution is an important process that alters nanoparticle abundance and properties.

Here we used EDTA (ethylenediaminetetraacetic acid) to dissolve ZnS nanoparticles and develop a predictive model for the effects of particle size and pH on nanoparticle reactivity. Synchrotron in situ small-angle X-ray scattering (SAXS) was used to monitor changes in scattering intensity Cited by: The samples of DaGang atmospheric residue (DG-AR), Middle East atmospheric residue (ME-AR), TaHe atmospheric residue (TH-AR), and their thermal reaction samples were chosen for study.

All the samples were fractioned into six components separately, including saturates plus light aromatics, heavy aromatics, light resins, middle resins, heavy resins, and asphaltenes. Cited by: 4.

Introduction—generalities on spent nuclear fuel. Natural uranium (U) is formed by % of fertile U and % of fissile U. Before it is used as fuel in a commercial reactor, uranium is enriched up to 2%–5% of U, so that the electricity yield of a light-water reactor (LWR) is maximized.

The exception is Canada Deuterium Uranium (CANDU) reactor fuels, which. Production of high-purity α-emitting Ac and Bi radionuclides for use in nuclear medicine. Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels.

Particles with larger size and lower surface area show a decrease of the rate at which the non-nucleated grains between the boundaries transform, and an increase of the ending time of Ca(OH) 2 transformation. The effect of temperature on the carbonation kinetics and on the CaCO 3 polymorphs formation was by: 4.

disco 3 table of content 1 context and objectives 5 mox long-term corrosion in the disposal environment 5 chemical and reactive transport modeling for the performance assessment 6 objectives and content of this progress report 6 2 modeling codes and database 9 chemical modeling with chess 9 thermodynamic data 9 modeling of reactive.

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Iron redox cycling is supposed to be one of the major mechanisms that control the geochemical boundary conditions in the near field of a geologic repository for UO2 spent nuclear fuel. This work investigates the impact of reactions between hydrogen peroxide (H2O2) and iron (Fe2+/Fe3+) on UO2 dissolution.

The reaction partners were contacted with UO2 in oxygen. Fast matrix dissolution might result in colloid formation (Ahn, ) and therefore multiple-layer sorption or precipitation of actinides on colloids (e.g., uranophane or zirconium oxide colloids) as well as on groundwater colloids.

Recrystallization and solid-solution formation with barite is considered as relevant retention mechanism for Ra in long-term scenarios of nuclear waste management. Here, we studied the effect of ionic strength and the presence of Sr in solution upon the Ra-uptake kinetics and final Ra concentrations in solution by recrystallizing barite in solution with varying Sr and NaCl.

Ahn has written: 'Long-term kinetic effects and colloid formations in dissolution of LWR spent fuels' -- subject- s -: Deterioration, Spent reactor fuels, Radioactive wastes. Heap leach operations typically employ some form of modelling and forecasting tools to predict cash flow margins and project viability.

However, these vary from simple spreadsheets to phenomenological models, with more complex models not commonly employed as they require the greatest amount of time and effort.

Yet, accurate production modelling and forecasting are Cited by: 4. because of radiological effects on colloid formation and degradation.

Furthermore, although not directly relevant to geosphere transport, it was also noted at the workshop that preferential ejection of U from the matrix of spent nuclear fuel by alpha-recoil is a potentially important near-field phenomenon. Safe long-term storage of radioactive waste from nuclear power plants is one of the main concerns for the nuclear industry as well as for governments in countries relying on electricity produced by nuclear power.

A repository for spent nuclear fuel must be safe for extremely long time periods (at least years).Cited by: 4. The oxidation of pyrite is one of the near field processes of the chemical evolution of clay rock planned to host a deep geological radioactive waste repository during operation.

Indeed, this process can lead to transitory acidic conditions in the medium (i.e., production of sulphuric acid, carbonic acid) which may influence the corrosion kinetics of the carbon steel components of Cited by: 1. Occasionally, the classic understanding of the effect of pH on P uptake from soils is questioned through the claim that maximum P uptake occurs at a pH much lower than –7.

The purpose of this paper was to thoroughly examine that claim and provide a critical review on soil processes that control how soil pH affects P solubility and by: Unstable systems are exposed to coagulation leading to the formation of larger particles.

The stability of colloidal solutions varies in a very wide range: their life lasts from fractions of a second to hundreds of years. It depends on many factors: particles' size and concentration, process temperature, presence of electrolytes.

The best dissolution properties and a “spring and parachute” effect were found for SVS spray-dried from a 5% SLS solution without LYS. Despite the presence of at least partially crystalline SLS in the mixtures, all the studied formulations were able to significantly extend the stability of amorphous SVS compared to previous co-amorphous.

Thermal Energy Vocab. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. whatihateaboutu. chapter 12 physics text book by glencoe.

Terms in this set (11) Conduction. the process by which kinetic energy is transferred when particles collide. thermal equilibrium. the state where the rate of energy flow between two.

@article{osti_, title = {The burnup dependence of light water reactor spent fuel oxidation}, author = {Hanson, B D}, abstractNote = {Over the temperature range of interest for dry storage or for placement of spent fuel in a permanent repository under the conditions now being considered, UO{sub 2} is thermodynamically unstable with respect to oxidation to higher oxides.

the dissolution of some particles and the growth of others, which are relatively more stable, or by the sticking together but not coalescence of the "primary" particles and the formation of aggregates with or without layers of the dispersion medium between the particle.

A condition for equilibrium in a colloid system with respect to pro. Identify the items by the form of energy they use, either Kinetic or Potential. 4 minutes ago A swimmer swims faster and increases from m/s to m/s during the last 20 seconds.

What is the Final Velocity. 6 Waste Forms and Disposal Environments. The first charge of the statement of task for this study (see Box in Chapter 2) calls on the National Academies to identify and describe “Essential characteristics of waste forms that will govern their performance within relevant disposal study will focus on disposal systems associated with high-cost waste streams.

Long term stability reproducibility and of magnetic colloids are key issues for steady values of Specific Power Absorption through time. Sanz* [a,b,c ], M.P. Calatayud [a,b, N. Cassinelli [c], M.R. Ibarra and G. Goya* [a,b] Abstract: Virtually. Effects of high burn-up operation of LWR and extended cooling period of spent fuel on high-level waste properties for vitrification and storage Kawai, K., Sagara, Spent fuels.

Cooling. Heat generation. Temperature dependence of long-term alteration rate for aqueous alteration of P simulated waste glass under smectite forming conditions.

The research described in this report was performed under a grant from the U.S. Department of Energy (DOE) to describe and compare the merits of two advanced alternative nuclear fuel cycles -- named by this study as the “UREX+3c fuel cycle” and the “Alternative Fuel Cycle” (AFC). @article{osti_, title = {A justification for the use of data from accelerated leach tests of glass}, author = {Ahn, T M and Interrante, C G and Weller, R A}, abstractNote = {A case is made for the use of short-term laboratory data in making predictions on the likelihood of significant colloid formation in supersaturated leachates of glass, under long-term repository conditions.

As the average kinetic energy of a substance increases, the internal energy, and so its thermal energy. as the thermal energy of a substance increases, the temperature.

See answers (2) +21 izvoru47 and 21 others learned from this answer Temperature is the average kinetic energy in a system. It's temperature will increase. 12 votes.Describes a collision in which kinetic energy may be transferred between the colliding particles but the total kinetic energy of the two particles remains the same.

temperature A measure of the average kinetic energy of the particles in a sample of matter. hich state of matter has the most kinetic energy?

A) colloid B) gas C) liquid D) solid -

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