Prof.
Maik Lang
(University of Tennessee)
31/10/2017, 15:15
National and international collaborative waste management programs
Oral Presentation
For the past 30 years, the development of durable materials for radionuclide immobilization has been central to efforts to dispose of wastes generated by the nuclear fuel cycle. There still exist, however, large gaps in the understanding of fundamental modes of waste form degradation under repository conditions. Comprehensive evaluation of waste form performance, including resistance to...
Dr
Ian Farnan
(University of Cambridge)
31/10/2017, 15:45
Oral Presentation
Plutonium doped YPO4 was prepared to test the extent of solid solution and the effect of radiation damage over several years. Y0.92 238Pu0.08PO4 showed the presence of a Pu substituted xenotime phase and a 238PuP2O7 phase by X-ray diffraction (XRD). The 31P magic‑angle spinning nuclear magnetic resonance (MASNMR) spectrum showed peaks for PuP2O7 and peaks assigned to phosphorus coupled to...
Dr
Ming Tang
(Los Alamos National Laboratory)
31/10/2017, 16:00
National and international collaborative waste management programs
Oral Presentation
Multi-phase ceramic waste forms were fabricated by melt-processing and hot isostatic pressing (HIP) to immobilize alkaline/alkaline earth (Cs/Sr-CS) + lanthanide (LN) + transition metal (TM) fission product waste streams from nuclear fuel reprocessing. Al2O3 and TiO2 were combined with these waste components to produce multi-phase crystalline ceramics containing hollandite-type phases,...
Dr
Christoph Lenz
(ANSTO)
31/10/2017, 16:15
National and international collaborative waste management programs
Oral Presentation
The investigation of radiation damaged or metamict minerals and their synthetic analogues has increased appreciably over the past two decades, stimulated by the potential use of mineral-like ceramics as waste forms for the immobilisation of reprocessed spent nuclear fuel and other radioactive waste. In this research field, however, a fast and inexpensive technique operating in the micrometre...
Dr
Tao Wei
(ANSTO)
31/10/2017, 16:30
National and international collaborative waste management programs
Oral Presentation
Radioactive wastes are generated from the entire nuclear fuel cycle from mining to the burning of uranium fuel in the nuclear reactors. Pyrochlore (ABTi2O7) and zirconolite (CaZrTiO7) based glass-ceramics have been became an immerging candidate waste form matrix and attracted attention as it combines the process and chemical flexibility of glasses with the chemical durability of ceramics. It...
Dr
Nelly TOULHOAT
(CNRS/IN2P3/IPNL)
31/10/2017, 16:45
National and international collaborative waste management programs
Oral Presentation
Graphite has been widely used in different types of reactors such as gas or water cooled reactors. Disposal of the irradiated graphite waste is a current management strategy for the resulting graphite waste for which two main radionuclides, 14C and 36Cl, might be dose determining at the outlet. In order to simulate both ballistic and electronic effects induced by irradiation, model and nuclear...
Ms
Isadora Borba da Busch
(UNSW Sydney)
31/10/2017, 17:00
National and international collaborative waste management programs
Oral Presentation
Radioactive materials are used for several key applications in Australia, and resultantly, ~4248 m3 of low level and 656 m3 of intermediate level waste are currently stored on site. The present work investigates the development of an ambient-cured geopolymer composition for storage of low level radioactive wastes. These geopolymers were fabricated by ambient curing of mixtures of fly ash and...
Dr
Dirk Mallants
(CSIRO)
31/10/2017, 17:15
Radionuclide solubility, speciation, sorption and migration.
Oral Presentation
Cementitious materials are being widely used as solidification/stabilisation and barrier materials for a variety of radioactive wastes. The retention properties result from mineral phases in hydrated cement that (i) possess a high density and diversity of reactive sites for the fixation of radionuclides through a variety of sorption reactions (surface adsorption, incorporation and...
