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 20 of 34 for “"passive safety"”.
-
Artificial Neural Network and Dynamic Probabilistic Risk Assessment for passive safety systems
… (DPRA) as advanced methodologies for the safety assessment of passive safety systems, particularly in mitigating Loss of Coolant Accidents (LOCAs). While using the BWRX-300 SMR, the study highlights the broader applicability of these techniques to enhance traditional Probabilistic Safety …
-
Enhancing Satellite Constellations with Scalable Network Simulation and Rapid Passive Safety Assessment
… is the introduction of a novel, rapid passive safety-checking method based on closed-form analysis of relative orbital elements and exact geometric envelopes. By mapping satellite dynamics to the Hill–Clohessy–Wiltshire equations and leveraging analytical solutions to ellipse …
-
The impact of passive safety systems on desirability of advanced light water reactors
… the advanced light water reactor designs with passive safety systems are more desirable than advanced reactor designs with active safety systems from the point of view of uncertainty in the performance of safety systems as well as the economic implications of the passive safety systems. Two …
-
Dynamic fuzzy reliability and safety assessment of passive safety systems in small modular reactors
… advantage associated with SMRs is their improved safety, which is expected to be accomplished by integrating a wide range of novel design elements, such as Passive Safety Systems (PSS) and components. Passive safety systems rely on natural processes rather than active intervention, hence …
-
Methods for comparative assessment of active and passive safety systems with respect to reliability, uncertainty, economy, and flexibility
Passive cooling systems sometimes use natural circulation, and they are not dependent on emergency AC power or offsite power, which can make designs simpler through the reduction of emergency power supplying infrastructure. The passive system approach can lead to substantial simplification of the …
-
Active control of passive safety in passenger motor vehicles : a feasibility study investigating dynamic denting of members using pyrotechnic devices
This report describes a feasibility study investigating dynamic denting of members using pyrotechnic devices to engineer favourable energy absorption characteristics into thin walled tubes. A tube of sufficiently low slenderness ratio and wall thickness, when loaded axially to failure, will …
-
Experimental investigations of natural circulation in a separate-and-mixed effects test facility mimicking prismatic modular reactor (PMR) core
… (PMRs). Natural circulation is employed as a passive safety feature that passively removes the decay heat released after the loss of flow accidents (LOFA). Several computational studies have addressed such phenomena, however, validation of Computational Fluid Dynamics (CFD) is needed by …
-
Reliability analysis of a passive cooling system using a response surface with an application to the Flexible Conversion Ratio Reactor
A comprehensive risk-informed methodology for passive safety system design and performance assessment is presented and demonstrated on the Flexible Conversion Ratio Reactor (FCRR). First, the methodology provides a framework for risk-informed design decisions and as an example two design options …
-
CFD Modeling and Simulation of Natural Circulation in Helium- Cooled Very High Temperature Reactors
… focusing on the performance and validation of passive safety features under Pressurized or Depressurized Loss of Forced Cooling (P-LOFC or D-LOFC) events. An experimental facility inspired by the General Atomics 350 MWt Modular High Temperature Gas-Cooled Reactor (MHTGR) was developed at The …
-
Helium-Air mixing in simulated reactor cavities of Very High Temperature Reactors
… purposes. They have a high level of inherent passive safety making them a viable alternative to traditional water-cooled reactors. These helium gas-cooled reactors use graphite containing U-235 TRISO fuel particles in their core, as a moderator to slow down neutrons for fission chain reactions …
-
Residual Crashes and Injured Occupants with Lane Departure Prevention Systems
… technology, some rollover crashes still occur. Passive safety systems such as seat belts, side curtain airbags, and stronger roofs work to protect occupants during rollover crashes. Seat belts prevent occupants from moving inside the occupant compartment during the rollover and both seat belts …
-
Plenum-to-plenum heat transfer characteristics under natural circulation in a scaled-down prismatic modular reactor
… producing hydrogen. Studying and developing the safety analysis and GCR technologies are required for the optimum design and safety of GCR system. Multiphase Reactors Engineering and Applications Laboratory (mReal) at Missouri University of Science and Technology (S&T) has developed a natural …
-
Natural convection of molten salt in laterally heated and top cooled vertical cylinders
… circulation, they are especially suitable for passive safety. Unlike the common reactor designs with fuel in the form of solid pellets, molten salt reactors use a liquid fuel form where the fissile materials are dissolved in the molten salt. Natural circulation characteristics within the molten …
-
Road safety : an analysis of shortcomings with proposals for improvements from a road engineering perspective
… fatigue; and vehicle defects Undoubtedly, road safety should be a critical priority and deserves commitments at highest levels. The solution to the road safety problem is based on the "three Es" principle: Engineering, Education and Enforcement. The aim of this dissertation is to tackle the …
-
Incorporation of Corrosion Mechanisms into a State-dependent Probabilistic Risk Assessment
… power plants and an increased interest in passive safety systems in Generation III+ and small modular reactors has brought a new focus in probabilistic risk assessment (PRA) to the treatment of passive systems, structures and components (SSCs). Although previously thought to play a lesser …
-
Computational fluid dynamics modeling and comparison of advanced techniques for heat transfer augmentation for nuclear applications
<p>“Passive safety is the most important feature of NuScale’s reactor designs. Twist tape is one passive heat enhance heat technique. The present research investigated thermo-hydraulic characteristics of natural and forced convection of water under different configurations of twisted tape inserted …
-
Feasibility Analysis for a Nuclear-Powered Commercial Merchant Ship
… were created to improve economics, increase passive safety measures, and expand fuel cycle control, and so far, research efforts have been so successful that the idea of incorporating these designs into the overall climate change solution has been met with significant support from both public …
-
Dynamic accident sequence analysis using dynamic flowgraph method and Markov/cell-to-cell mapping technique
… and adequacy of classical probabilistic safety assessment (PSA) techniques (fault/event tree) to account for dynamic system interactions and time-dependent accident sequence evolution. Subsequently there is an interest within the PSA community to complement the classical techniques with …
-
Innovative design of uranium startup fast reactors
… type. Both carbide and metal fuel have excellent passive safety performance. It is concluded that the USFR approach is a competitive way to accelerate fast reactor development.
-
Development of a Supervisory Control System as a Transition Technology Towards Autonomous Reactor Plant Operations
… expenses. Advanced reactor designs with enhanced passive safety features, reduced source terms, and digital instrumentation and control systems, directly support autonomous controllers. In these plants, where the need for human operators is already reduced, the introduction of supervisory control …
Page 1 of 2