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.
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Showing 1 to 18 of 18 for “"Nuclear Power Plants (npps)"”.
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Study of radio frequency inductively coupled thermal plasma torch (RF ICPT) for radioactive waste treatment: thermoplastics - polyethylene and polyvinyl chloride (PVC)
… Among the many RW materials originating from nuclear power plants (NPPs), thermoplastics such as polyvinyl chloride (PVC) and polyethylene (PE) contribute significant amount to the overall volume of RW. The presence of radioactive nuclides in PVC and PE waste originating from NPPs and their …
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Specifics of forced-convection heat transfer in a vertical 7-element bundle cooled with upward flow of SuperCritical Water
Current Generation II/III/III+ Nuclear Power Plants (NPPs) are no longer economically competitive partially due to low thermal efficiencies. Six Generation IV NPP concepts were proposed having increased thermal efficiency, with Canada investigating the SuperCritical Water Reactor (SCWR) concept. …
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Challenges facing the development of new nuclear capacity in South Africa
South Africa currently (2022) hosts two nuclear reactor facilities, the electricity generating Koeberg nuclear power plant, and the SAFARI - 1 reactor, which is used for medical isotope production, research, and development. With the nationwide problems of loadshedding due to a lack of operational …
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Integrated Model of a Floating Nuclear System for Hydrogen and Ammonia Production
… industries and as an efficient hydrogen carrier. Nuclear Power Plants (NPPs) play a critical role in this scenario, offering a steady supply of low-carbon energy. This thesis explores the economic and environmental viability of an innovative marine-based facility for generating green hydrogen and …
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Discrete-Time Bayesian Networks Applied to Reliability of Flexible Coping Strategies of Nuclear Power Plants
The Fukushima Daiichi accident prompted the nuclear community to find a new solution to reduce the risky situations in nuclear power plants (NPPs) due to beyond-design-basis external events (BDBEEs). An implementation guide for diverse and flexible coping strategies (FLEX) has been presented by …
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Dynamic safety assessment of FPGA-based safety critical systems with applications in nuclear power generation
… that FPGA implementations of I&C systems in Nuclear Power Plants (NPPs) is expected to increase significantly in the future. One issue facing FPGAs in the nuclear field is a lack of technical standards and design/review documentation. Therefore, the research program undertaken during this …
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Methods for optimization of neutron detector performance in nuclear power plants
Safety of nuclear power plants (NPPs) requires shutdown systems to mitigate design-basis accidents. Shutdown is based on measurements from in-core flux detectors. Thus, this thesis proposes a methodology for managing neutron-detector aging. Detector performance improvement for prompt fraction along …
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Machine Learning-Driven Uncertainty Quantification and Parameter Analysis in Fire Risk Assessment for Nuclear Power Plants
… poses a critical risk to the safe operation of nuclear power plants (NPPs), with electrical cabinet and liquid spill fires being among the most frequent and challenging scenarios to address. Traditional fire risk assessment models often lack precision due to complex physics and inherent …
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Heat-transfer analysis of double-pipe heat exchangers for indirect-cycle SCW NPP
… are being developed as one of the Generation-IV nuclear-reactor concepts. SuperCritical Water (SCW) Nuclear Power Plants (NPPs) are expected to have much higher operating parameters compared to current NPPs, i.e., pressure of about 25 MPa and outlet temperature up to 625 oC. This study presents …
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Development of thermodynamic cycles for sodium-cooled-fast reactors.
… challenge is designing Generation IV (GEN-IV) Nuclear Power Plants (NPPs) with significantly higher thermal efficiencies compared to current NPPs, and to match, or at least to be close to, the thermal efficiencies reached by fossil-fired power plants, which are currently at the level of 40-62%. …
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Towards Semi-Autonomous, Highly Automated, and Remotely Operated (SAHARO) Nuclear Reactors
… to ensure the safe and reliable operation of nuclear power plants (NPPs). Most of these plants have belonged to the same design class: large, centrally located Light Water Reactors (LWRs). Thus, our regulatory processes were tailored for their phenomenology and the unique challenges associated …
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A testbed to assess digital instrumentation and control and cyber security of nuclear power plants
Existing nuclear power plants (NPPs) are switching from analog to digital control systems, and digital instrumentation and control (I&C) systems are expected to be used in all of the new NPPs. Digital I&C is expected to improve the performance of communication, maintenance, and signal processing. …
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Risk-informed public safety policy for seismic events in the vicinity of a nuclear power plant
Nuclear Power Plants (NPPs) are potentially vulnerable to accidents, which can either be internally or externally initiated. External events include natural events like tornadoes, hurricanes, and earthquakes. The purpose of this thesis is to understand the characteristics of public risks arising …
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Light Water Reactor Loading Pattern Optimization with Reinforcement Learning Algorithms
In 2023, Commercial Nuclear Power Plants (NPPs) in the USA, comprising Light Water Reactors (LWRs) such as Pressurized Water Reactors (PWRs) and Boiling Water Reactors (BWRs), remained the largest single source of carbon-free energy. They provided approximately half of the nation’s carbon-free …
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An Investigation of Major Component Disposal Costs for Advanced Nuclear Reactors
… is an important aspect for decommissioning of Nuclear Power Plants (NPPs) that requires an understanding of the characteristics of the waste forms. The costs of disposal depend on the activity, volume, dose rate and waste handling/packaging. The U.S. average nuclear reactor age is 40 years old, …
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RADIATION CHEMISTRY IN PRESSURIZED WATER NUCLEAR REACTORS: H2 GENERATION BY 10B(n,α)7Li, AND THE REACTION OF BORATE WITH •OH
Nuclear power plants (NPPs) are complex engineering systems, with malfunctions having enormous potential to lead to widespread and extreme impacts on society and the environment as a whole. Their safe operation depends on a multitude of factors such as intelligent planning, proper design, quality …
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Methodologies to strategize the utilization of modeling and simulation for probabilistic risk assessment (PRA) of nuclear power plants: Applications in fire PRA
… the safety and operational efficiency of nuclear power plants (NPPs). PRA quantitatively assesses safety margins and identifies risk-contributing factors, supporting risk-informed decision-making of both the nuclear industry and the regulators. In PRA, the calculation of P_f^* and P(P_f^* …
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Theorizing and quantifying organizational and social factors in probabilistic risk assessment of complex systems
… in high-consequence industries, such as nuclear power, aviation, oil and gas, and healthcare. Probabilistic Risk Assessment (PRA) is a formal methodology for estimating risk emerging from the interactions of equipment failure and human error. This research is the product of a line of a …