scholarly journals Materials Characterization Center state-of-the-art report on corrosion data pertaining to metallic barriers for nuclear-waste repositories

1982 ◽  
Author(s):  
M.D. Merz
Keyword(s):  
Nuclear Waste ◽  
State Of The Art ◽  
Materials Characterization ◽  
Waste Repositories ◽  
Corrosion Data

scholarly journals Modeling of Nuclear Waste Forms: State-of-the-Art and Perspectives

MRS Advances ◽  
2020 ◽  
Vol 5 (5-6) ◽  
pp. 213-222
Author(s):  
Piotr. M. Kowalski ◽  
Steve Lange ◽  
Guido Deissmann ◽  
Mengli Sun ◽  
Kristina O. Kvashnina ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
State Of The Art ◽  
Mixed Valence ◽  
Scientific Basis ◽  
Atomistic Simulations ◽  
Barrier Materials ◽  
Uranium Oxidation ◽  
Safety Case ◽  
Waste Repositories ◽  
Nuclear Waste Forms

ABSTRACTComputational modeling is an important aspect of the research on nuclear waste materials. In particular, atomistic simulations, when used complementary to experimental efforts, contribute to the scientific basis of safety case for nuclear waste repositories. Here we discuss the state-of-the-art and perspectives of atomistic modeling for nuclear waste management on a few cases of successful synergy of atomistic simulations and experiments. In particular, we discuss here: (1) the potential of atomistic simulations to investigate the uranium oxidation state in mixed-valence uranium oxides and (2) the ability of cementitious barrier materials to retain radionuclides such as 226Ra and 90Sr, and of studtite/metastudtite secondary peroxide phases to incorporate actinides such as Np and Am. The new contribution we make here is the computation of the incorporation of Sr by C-S-H (calcium silicate hydrate) phases.

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

2012 ◽  
Vol 57 (4) ◽  
pp. 951-974 ◽  
Author(s):  
Andrzej Nowakowski ◽  
Mariusz Młynarczuk
Keyword(s):  
Mechanical Properties ◽  
Nuclear Waste ◽  
Structural Changes ◽  
Structural Parameters ◽  
Total Porosity ◽  
Fracture Network ◽  
Qualitative Description ◽  
Temperature Changes ◽  
Heating And Cooling ◽  
Waste Repositories

Abstract Temperature is one of the basic factors influencing physical and structural properties of rocks. A quantitative and qualitative description of this influence becomes essential in underground construction and, in particular, in the construction of various underground storage facilities, including nuclear waste repositories. The present paper discusses the effects of temperature changes on selected mechanical and structural parameters of the Strzelin granites. Its authors focused on analyzing the changes of granite properties that accompany rapid temperature changes, for temperatures lower than 573ºC, which is the value at which the β - α phase transition in quartz occurs. Some of the criteria for selecting the temperature range were the results of measurements carried out at nuclear waste repositories. It was demonstrated that, as a result of the adopted procedure of heating and cooling of samples, the examined rock starts to reveal measurable structural changes, which, in turn, induces vital changes of its selected mechanical properties. In particular, it was shown that one of the quantities describing the structure of the rock - namely, the fracture network - grew significantly. As a consequence, vital changes could be observed in the following physical quantities characterizing the rock: primary wave velocity (vp), permeability coefficient (k), total porosity (n) and fracture porosity (η), limit of compressive strength (Rσ1) and the accompanying deformation (Rε1), Young’s modulus (E), and Poisson’s ratio (ν).

Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
M. Rovira ◽  
F.Z. El Aamrani ◽  
L. Duro ◽  
Ignasi Casas ◽  
Joan de Pablo ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Reactive Transport ◽  
Calculated Data ◽  
Buffering Capacity ◽  
Retardation Factor ◽  
Reactive Transport Modeling ◽  
Redox Active ◽  
Different Types ◽  
Free Media ◽  
Waste Repositories

The Lovasjärvi intrusion (SE-Finland) contents a high percentage of ferrous olivine (> 65%). This material has been suggested as a redox-active backfill-additive in deep nuclear waste repositories, due to the large Fe(II) proportion in its mineral composition. In order to understand the processes involved in the redox buffering capacity of this material the transport of uranium (VI) through olivine columns was studied. The results showed considerable retardation factor for the U(VI), particularly in carbonate-free media. The experimental data were simulated by means of reactive transport modeling. The best agreement between the experimental and calculated data was obtained considering that the interaction of U(VI) with the olivine surface occurred at two different types of sorption sites. One type accounts for the sorption capacity of the olivine mineral, and a second type accounts for the sorption on amorphous Fe(OH)

scholarly journals Geologic environments for nuclear waste repositories

2017 ◽  
Vol 120 ◽  
pp. 06003 ◽  
Author(s):  
Evan K. Paleologos ◽  
Abdel-Mohsen O. Mohamed ◽  
Kosmas Pavlopoulos
Keyword(s):  
Nuclear Waste ◽  
Waste Repositories

Perceived Risk and Benefit of Nuclear Waste Repositories: Four Opinion Clusters

Risk Analysis ◽  
2012 ◽  
Vol 33 (6) ◽  
pp. 1038-1048 ◽  
Author(s):  
Roman Seidl ◽  
Corinne Moser ◽  
Michael Stauffacher ◽  
Pius Krütli
Keyword(s):  
Nuclear Waste ◽  
Perceived Risk ◽  
Risk And Benefit ◽  
Waste Repositories

Speciation of actinides in groundwater samples collected near deep nuclear waste repositories

2018 ◽  
Vol 192 ◽  
pp. 334-341 ◽  
Author(s):  
A.P. Novikov ◽  
I.E. Vlasova ◽  
A.V. Safonov ◽  
V.M. Ermolaev ◽  
E.V. Zakharova ◽  
...  
Keyword(s):  
Nuclear Waste ◽  
Groundwater Samples ◽  
Waste Repositories
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