Results 1 to 10 of about 604,232 (350)

Microbial degradation of citrate mediates sealing of cement cracks under anaerobic conditions relevant to radioactive waste disposal [PDF]

npj Materials Degradation
In radioactive waste repositories, cement is used for construction, backfill, and waste encapsulation. Over time, cracks may form, creating potential pathways for contaminant migration.
Natalie Byrd, Ananya Singh, Naji M. Bassil, Joe S. Small, Frank Taylor, Christopher Boothman, Dirk L. Engelberg, Sultan Mahmood, Tristan Lowe, Jonathan R. Lloyd, Katherine Morris   +10 more
doaj   +2 more sources

Validation of Neutron Flux and Activation in the Nagra AMAC model of the Mühleberg Power Plant [PDF]

EPJ Web of Conferences, 2023
The decommissioning of the Mühleberg Nuclear Power Plant (KKM) is supported by Nagra (National Cooperative for the Disposal of Radioactive Waste) through computational analysis of neutron activation in the reactor components and structures using the ...
Bykov Valentyn, Volmert Ben, Pelloux Sylvain, Neukäter Erwin   +3 more
doaj   +1 more source

Interlink between solubility, structure, surface and thermodynamics in the ThO2(s, hyd)–H2O(l) system

Frontiers in Chemistry, 2022
The impact of temperature on a freshly precipitated ThO2(am, hyd) solid phase was investigated using a combination of undersaturation solubility experiments and a multi-method approach for the characterization of the solid phase.
Christian Kiefer, Thomas Neill, Thomas Neill, Nese Cevirim-Papaioannou, Dieter Schild, Xavier Gaona, Tonya Vitova, Kathy Dardenne, Jörg Rothe, Marcus Altmaier, Horst Geckeis   +10 more
doaj   +1 more source

Beryllium solubility and hydrolysis in dilute to concentrated CaCl2 solutions: thermodynamic description in cementitious systems

Frontiers in Nuclear Engineering, 2023
The solubility and hydrolysis of Be(II) was investigated from undersaturation conditions in alkaline, dilute to concentrated CaCl2 solutions (0.05–3.5 M). Experiments were performed with α-Be(OH)2(cr) under Ar atmosphere at T = (22 ± 2)°C.
Nese Çevirim-Papaioannou, Iuliia Androniuk, George Dan Miron, Marcus Altmaier, Xavier Gaona   +4 more
doaj   +1 more source

Combined X-ray absorption and SEM–EDX spectroscopic analysis for the speciation of thorium in soil

Scientific Reports, 2023
Mobility and bioavailability of radionuclides in the environment strongly depend on their aqueous speciation, adsorption behavior and the solubility of relevant solid phases. In the present context, we focus on naturally occurring Th-232 at a location in
Sanduni Ratnayake, Johannes Lützenkirchen, Nicolas Finck, Dieter Schild, Frank Heberling, Teba Gil-Díaz, Kathy Dardenne, Jörg Rothe, Horst Geckeis   +8 more
doaj   +1 more source

Measuring thermal conductivity and water suction for variably saturated bentonite

Nuclear Engineering and Technology, 2021
An engineered barrier system (EBS) for the disposal of high-level radioactive waste (HLW) is composed of a disposal canister with spent fuel, a buffer material, a gap-filling material, and a backfill material.
Seok Yoon, Geon-Young Kim
doaj   +1 more source

Improvement of the froth flotation of LiAlO2 and melilite solid solution via pre-functionalization

Scientific Reports, 2021
In this work froth flotation studies with LiAlO2 (lithium-containing phase) and Melilite solid solution (gangue phase) are presented. The system was optimized with standard collectors and with compounds so far not applied as collectors.
Hao Qiu, Jule Kersebaum, Annett Wollmann, Niklas Feuge, Andrea Haas, Daniel Goldmann, René Wilhelm   +6 more
doaj   +1 more source

Implementation of cryogenic tender X-ray HR-XANES spectroscopy at the ACT station of the CAT-ACT beamline at the KIT Light Source

Journal of Synchrotron Radiation, 2022
The ACT experimental station of the CAT-ACT wiggler beamline at the Karlsruhe Institute of Technology (KIT) Light Source is dedicated to the investigation of radionuclide materials with radioactivities up to 1000000 times the exemption limit by various ...
Bianca Schacherl, Tim Prüssmann, Kathy Dardenne, Kirsten Hardock, Volker Krepper, Jörg Rothe, Tonya Vitova, Horst Geckeis   +7 more
doaj   +1 more source

Benefit and Cost Ratio Analysis of Direct Disposal and Pyro-SFR Fuel Cycle Alternatives Using the Results of Multi-Criteria Decision-Making in Korea

Energies, 2021
This paper presents the results of various benefit–cost ratio (BCR) analyses of back-end nuclear fuel cycle alternatives. Korea is currently considering two alternatives for the disposal of spent nuclear fuel: direct disposal and pyroprocessing.
Sungki Kim, Jin-Seop Kim, Dong-Keun Cho
doaj   +1 more source

Parallel groundwater flow simulation method based on a discrete fracture network model

地质科技通报, 2023
Objective Groundwater flow in fractured rocks has strong heterogeneity and anisotropy. The discrete fracture network (DFN) method has been internationally considered as one of the most reasonable and effective methods to describe the fracture water ...
Jingbo Zhao, Jian Liu, Zhichao Zhou, Ruili Ji, Ming Zhang, Xinyu Fu   +5 more
doaj   +1 more source