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 21 for “"Probabilistic Risk Assessment (pra)"”.
-
Failure record discounting in Bayesian analysis in Probabilistic Risk Assessment (PRA) : a space system application
… binomial probability of failure on demand in Probabilistic Risk Assessment (PRA), the corresponding number of observed failures may be not directly applicable due to design or procedure changes that have been implemented in the system as a result of past failures. A methodology has been …
-
Methodologies to strategize the utilization of modeling and simulation for probabilistic risk assessment (PRA) of nuclear power plants: Applications in fire PRA
Based on the literature, one way to conceptualize risk is: Risk={A,C,P_f^*,P(P_f^* ) | U^',K}, where A represents events including initiating events and scenarios; C denotes the consequences of these events (A); P_f^* stands for the estimated frequency of occurrences of events A; P(P_f^* ) is a …
-
Probabilistic risk assessment of system-level radiation effects
… analysis is performed using a time-dependent Probabilistic Risk Assessment (PRA) methodology. Data-driven models for the expected behavior of radiation-sensitive parts are instanced in a system model for Fault Tree Analysis (FTA). The system model is then solved using Bayesian Networks and …
-
On the quantification of safety margins
… not be quantified. The subsequent development of Probabilistic Risk Assessment (PRA) has provided the analytical tools that allow the quantification of uncertainties associated with accident initiation and progression. But, while the impact of redundancy has been explicitly modeled and quantified, …
-
Criteria for assessing the quality of nuclear probabilistic risk assessments
The final outcome of a nuclear Probabilistic Risk Assessment (PRA) is generally inaccurate and imprecise. This is primarily because not all risk contributors are addressed in the analysis, and there are state-of-knowledge uncertainties about input parameters and how models should be constructed. In …
-
The use for frequency-consequence curves in future reactor licensing
… systematically insights and benefits from Probabilistic Risk Assessment (PRA). With the goal of making the licensing process more efficient, predictable and stable for advanced reactors, the U.S. Nuclear Regulatory Commission (USNRC) has recently drafted a risk-informed and …
-
Petri net modeling of fault analysis for probabilistic risk assessment
… accepted as the modeling strategy to perform Probabilistic Risk Assessment (PRA). However, there are several limitations associated with fault tree/event tree modeling. These include 1. It only considers binary events; 2. It assumes independence among basic events; and 3. It does not consider …
-
Discrete-Time Bayesian Networks Applied to Reliability of Flexible Coping Strategies of Nuclear Power Plants
… 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 Nuclear Energy Institute (NEI) to manage the …
-
Using risk-based regulations for licensing nuclear power plants : case study of gas-cooled fast reactor
… presented. We argue that full benefice of modem risk analysis methods could not be obtained unless adopting a more ambitious and risk-based regulatory framework. A risk-based licensing framework is then presented, based on previous research from MIT. Probabilistic Risk Assessment (PRA) analyses …
-
Satellite System Safety Analysis Using STPA
… models of accident causality, such as the probabilistic risk assessment (PRA) method currently used at NASA, are inadequate for analyzing safety at the system level. System-Theoretic Accident Model and Processes (STAMP) shifts the focus of safety from preventing failures to that of a …
-
Incorporation of Corrosion Mechanisms into a State-dependent Probabilistic Risk Assessment
… 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 role in determining plant risk, research and industry experience have shown that degradation …
-
Deterministic casualty analysis of the Pebble Bed Modular Reactor for use with risk-based safety regulation
… reactors that are not light water technology. Risk based reactor licensing, which uses the Probabilistic Risk Assessment (PRA) to justify most licensing questions, is a proposed replacement for the current methods. This work further develops the risk-based regulatory process by analyzing a …
-
Integrating geographic information systems with the Level 3 Probabilistic Risk Assessment of nuclear power plants to advance modeling of socio-technical infrastructure in emergency response applications
… social and organizational factors into Level 1 Probabilistic Risk Assessment (PRA) has been theoretically and methodologically improved and now is in the process of development for Nuclear Power Plant (NPPs) applications. The goal of this study is to initiate the same paradigm of research for …
-
Spatio-temporal probabilistic methodology to estimate location-specific loss-of-coolant accident frequencies for risk-informed analysis of nuclear power plants
… Commission (NRC) has promoted the use of Probabilistic Risk Assessment (PRA) in nuclear regulatory activities. Since loss-of-coolant accidents (LOCAs) are critical initiating events for many PRA applications, the NRC has taken steps towards the quantification of LOCA frequencies for use in …
-
Uncertainty and sensitivity analysis of a fire-induced accident scenario involving binary variables and mechanistic codes
… States Nuclear Regulatory Commission (NRC) to a risk-informed, performance-based fire protection rulemaking standard, Fire Probabilistic Risk Assessment (PRA) methods have been improved, particularly in the areas of advanced fire modeling and computational methods. As the methods for the …
-
Hybrid Causal Logic Methodology for Risk Assessment
Probabilistic Risk Assessment is being increasingly used in a number of industries such as nuclear, aerospace, chemical process, to name a few. Probabilistic Risk Assessment (PRA) characterizes risk in terms of three questions: (1) What can go wrong? (2) How likely is it? (3) What are the …
-
Applying Probabilistic Risk Assessment to Agricultural Nonpoint Source Pollution
A probabilistic risk assessment (PRA) for the discharge of excessive nitrogen from nonpoint sources (NPSs) to a stream was performed for a small agricultural watershed in northern Virginia. Risk, by definition, is the product of the frequency of occurrence of an event and the consequences of that …
-
Evaluation of Adaptation Options to Flood Risk in a Probabilistic Framework
Probabilistic risk assessment (PRA) has been used in various engineering and technological fields to assist regulatory agencies, and decision-makers to assess and reduce the risks inherent in complex systems. PRA allows decision-makers to make risk-informed choices rather than simply relying on …
-
Theorizing and quantifying organizational and social factors in probabilistic risk assessment of complex systems
… 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 collaborative study to theorize and quantify the …
-
Integrated probabilistic risk assessment (I-PRA) methodology and computational platform for fire PRA of nuclear power plants
Probabilistic Risk Assessment (PRA) is a systematic methodology to estimate risk in complex technological systems. PRA has been utilized by both the nuclear industry and the U.S. Nuclear Regulatory Commission (NRC) to enhance Nuclear Power Plant (NPP) safety. In resolving emergent regulatory …
Page 1 of 2