Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"HLW"”.
-
Risk-informing decisions about high-level nuclear waste repositories
… decisions in high-level radioactive waste (HLW) management, particularly in evaluating safety cases for proposed HLW repository development. Assessing risk from geologic repositories for HLW poses a significant challenge due to the uncertainties in modeling complex systems of such large …
-
The search for an effective international regime for the long-term safety and security of high level radioactive waste: Pangea and beyond
… for high-level radioactive waste disposal (HLW). Nuclear states have attempted for decades to implement effective radioactive waste policies, though with limited success. The safe disposal of HLW has proven particularly troublesome and, thus far, a solution has eluded all states. A review of …
-
Geomechanical aspects of Sintered Silicon Carbide (SSiC) waste canisters for disposal of high level radioactive waste
High-level radioactive waste (HLW) poses threat to the biosphere. Geological disposal is accepted as a safe way for HLW disposal. Waste canisters made of Sintered Silicon Carbide (SSiC) are proposed and geomechanical safety aspects relating to such SSiC canisters are investigated. First part of the …
-
Remediation of spent oxalic acid nuclear decontamination solutions using ozone
… resolved problem that could be adapted to SRS HLW tank cleaning. A novel preliminary process called Enhanced Chemical Cleaning (ECC) was envisioned. As part of maturing the technology, the literature review identified three possible oxalate decomposition mechanisms associated with ECC. They …
-
Predicting radioactive waste glass properties with machine learning and modelling
… vitrifies its high-level radioactive waste (HLW), ultimately in preparation for deep geological disposal. This data has largely been collected in isolation, and there has been an open question whether this data could be of value when used collectively. With this motivation, this PhD has aimed …
-
Non-Neutron Transmutation of Spent Fuel
… of the nuclear fuel cycle for High-Level Waste (HLW). The need for a geologictime-scale repository could be reduced if the most active isotopes present in HLW could be identified and transmuted. While disposal would still be necessary, a smaller time scale could resolve some of the most …
-
Characterization of pozzolanic cement for radioactive waste disposal
… encasing high-level radioactive waste (HLW) and spent-nuclear fuel (SNF) in disposal canisters. This particular cement was produced by mixing lime or portland cement with volcanic tuff, a natural pozzolanic material extracted from Yucca Mountain, Nevada; Portland-pozzolan and …
-
Studies of Used Fuel Fluorination and U Extraction Based on Molten Salt Technology for Advanced Molten Salt Fuel Fabrication
… instead of being stored as high-level waste (HLW). The next technique was fluorination of UNF oxides using ZrF4. Using the same LiF-NaF-ZrF4 salt, uranium oxide (UO2), lanthanum oxide (La2O3), and yttrium oxide (Y2O3) were fluorinated into uranium fluoride (UF4), lanthanum fluoride (LaF3), and …
-
The thermal conductivity of filler materials and permeability of a cement sealant for deep borehole repositories for high level nuclear waste
… spent nuclear fuel (SNF) and high level waste (HLW). They also noted that deep boreholes drilled into granite bedrock may be a viable option. Among the major concerns regarding this type of repository are the retention of radionuclides and the tolerance of heat from the canisters in situ. As a …
-
Etablierung eines Modells zur Testung neurokognitiver Störungen nach kardiopulmonaler Reanimation bei Schweinen
OBJECTIVE: To test the feasibility of a neurocognitive test based on operant conditioning in a porcine model of cardiac arrest (CA) and cardiopulmonary resuscitation (CPR). Furthermore to characterize the influence of different durations of CA on cognitive performance and the accompanying …
-
Coupling source term, mineral reactivity and flow in radionuclide transport
The focus of this work is to investigate the dissolution of MW25, a non-radioactive simulant of UK high-level nuclear waste borosilicate glass, and to predict its performance in the near field of a geological repository. A single-pass flow-through (SPFT) experimental system was used to measure the …