Semi-Quantitative Risk Assessment of Adjacent Track Accidents on Shared-Use Rail Corridors

2014 ◽  
Author(s):  
Chen-Yu Lin ◽  
Mohd Rapik Saat
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Risk Mitigation ◽  
Quantitative Risk Assessment ◽  
Accident Rate ◽  
Individual Factor ◽  
Factors Affecting ◽  
Railroad Crossings ◽  
Accident Scenarios ◽  
High Level

Safety is a high priority for any rail system, and there are several safety concerns associated with operating passenger and freight trains on shared-use rail corridors. Adjacent track accident (ATA) is one of the most important concerns. ATA refers to train accident scenarios where a derailed equipment intrudes adjacent tracks, causing operation disturbance and potential subsequent train collisions on the adjacent tracks. Other ATA scenarios include collisions between trains on adjacent tracks (raking), turnouts, and railroad crossings. Limited literature is available that addressed the risk of ATA for shared-use rail corridors. The research described in this paper presents a comprehensive risk assessment to identify factors affecting the likelihood and consequence of adjacent track accidents. A discussion on how these factors affect the probability, consequence, and how individual factor relates to each other are provided. A semi-quantitative risk analysis is developed to investigate various factors affecting train accident rate, intrusion rate, and accident consequences. This research intends to depict a high-level overview of adjacent track accidents and provides a basis for future quantitative risk analyses and risk mitigation implementations.

Risk Analysis of Power-Gen Gas Turbines With GADS Outage Data

2017 ◽  
Author(s):  
Bin Zhou
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Risk Mitigation ◽  
Data System ◽  
Loss Prevention ◽  
The Past ◽  
The North ◽  
Effective Assessment

According to FM Global proprietary data, power-gen gas turbine losses have consistently represented a dominant share of the overall equipment-based loss value over the past decade. Effective assessment of loss exposure or risk related to gas turbines has become and will continue to be a critical but challenging task for property insurers and their clients. Such systematic gas turbine risk assessment is a necessary step to develop strategies for turbine risk mitigation and loss prevention. This paper presents a study of outage data from the Generating Availability Data System (GADS) by the North American Electric Reliability Corporation (NERC). The risk of forced outages in turbines was evaluated in terms of outage days and number of outages per unit-year. In order to understand the drivers of the forced outages, the influence of variables including turbine age, capacity, type, loading characteristic, and event cause codes were analyzed by grouping the outage events based on the chosen values (or ranges of values) of these variables. A list of major findings related to the effect of these variables on the risk of forced outage is discussed.

Quantitative Risk Analysis for Natural Gas Long-Distance Pipeline Leakage

2014 ◽  
Vol 1030-1032 ◽  
pp. 661-664
Author(s):  
Zhe Zuo
Keyword(s):  
Numerical Simulation ◽  
Risk Assessment ◽  
Natural Gas ◽  
Emergency Response ◽  
Necessary Conditions ◽  
Quantitative Risk Assessment ◽  
Safe Operation ◽  
Long Distance ◽  
Main Factors ◽  
Accident Scenarios

The risk of natural gas long-distance pipeline and main factors of accidents are analyzed in this paper. According the consequences from above, quantitative risk assessment of long-distance pipelines under specific accident scenarios are completed with the help of numerical simulation model on long-distance pipeline leakage and dispersion. What’s more, on the basis of the assessment results, the necessary conditions for long-distance pipeline safe operation are presented. Finally, conclusions and safe operations under necessary conditions given in this paper are helpful for regular operation of pipeline, accident prevention, emergency response and reasonable supervision.

scholarly journals Analysis and risk assessment of risk technical systems to develop of methodology for teaching students using the method fault tree

2019 ◽  
Vol 6 ◽  
pp. 17-27
Author(s):  
Tsvetelina Simeonova
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Fault Tree ◽  
Quantitative Risk Assessment ◽  
Web Based ◽  
Qualitative And Quantitative ◽  
Student Training ◽  
Technical Systems ◽  
Risk Analysis And Management ◽  
Tree Method

The aim of the present work is to develop a methodology for conducting exercises for analysis, assessment and management of risk, using a web based tool by identifying and analyzing the risk of occurrence of a dangerous event through the fault tree method. As a result, a framework is presented according to the proposed methodology applicable to the students' training in risk analysis, evaluation and management, and according to accepted assumptions. Approaches for qualitative and quantitative risk assessment are presented at the assumed value of the damages. In addition, a methodology for risk analysis, assessment and management applicable to student training on risk analysis and management has been developed and proposed.

scholarly journals Settlement Arrangement based on Landslide Risk Analysis in Girirejo, Bantul, Yogyakarta

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Sri Aminatun ◽  
Yunalia Muntafi
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Group Discussion ◽  
Disaster Risk ◽  
Risk Level ◽  
Landslide Risk ◽  
Weighting Method ◽  
Risk Identify ◽  
Risk Areas ◽  
High Level

<em>Located on a hilly topography with a steep slope, highlighted the importance of settlement arrangement based on a landslide risk assessment in Girirejo village, Imogiri, Bantul, Yogyakarta. This study aims to map landslides risk, identify houses in the landslide risk zone, and provide recommendations for settlement arrangements. The research begins with observation, interviews, and focus group discussion. Disaster risk mapping and analysis were carried out through weighting method based on Perka BNPB No.2 of 2012 concerning General Guidelines for Disaster Risk Assessment and a formula with parameters of hazard, vulnerability, and capacity. Results showed the medium to a high-level of landslide risk was dominated by northern and eastern parts of Girirejo (21 families in red-zone, 23 families in yellow-zone), while western and southern regions had a low landslide risk level. This research also provided a formulation of settlements concept for medium and high-risk areas by considering landslides risk analysis study.</em>

A Risk-Based Conceptual Design Method for Submarine Rescue Vehicle

2012 ◽  
Vol 201-202 ◽  
pp. 477-482
Author(s):  
Xing Ling Huang ◽  
Xiang Bing Huang
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Conceptual Design ◽  
Task Complexity ◽  
Risk Mitigation ◽  
Design Method ◽  
Assessment Tools ◽  
Analysis Model ◽  
Initial Design ◽  
Fuzzy Logic Approach

In order to reduce the risks and uncertainties in conceptual design of submarine rescue vehicle (SRV), the paper proposed a risk-based conceptual design method, which consisted of three focus areas: problem setup, risk assessment, risk mitigation and decision support. Conventional risk assessment tools (e.g. probability risk assessment) were not suited for initial design because of lack of data, and a safety analysis model using fuzzy-logic approach employing fuzzy IF-THEN rules was introduced to carry out risk analysis in conceptual design. Subsequently, it was investigated that the main risky factors which influenced system risk in initial design were technology level of SRV, safety of SRV, task complexity, investment and repayment. And then a risk analysis model for submarine rescue vehicle was introduced. Lastly a case was studied to demonstrate the application of the model, and the results showed that it was an effective way to reduce the risks and uncertainties in conceptual design process.

scholarly journals Semi-Quantitative Risk Assessment Method for Groundwater Source Protection using a Process-Based Interdisciplinary Approach

2021 ◽  
Author(s):  
Robert Duda ◽  
Robert Zdechlik ◽  
Jarosław Kania
Keyword(s):  
Risk Assessment ◽  
Industrial Development ◽  
Groundwater Resources ◽  
Interdisciplinary Approach ◽  
Assessment Method ◽  
Quantitative Risk Assessment ◽  
Factors Affecting ◽  
Mass Load ◽  
Groundwater Supply ◽  
Groundwater Source

Abstract Potable groundwater resources are under threat as a result of industrial development and an increase in fertilizer use. The protection of groundwater supply may require the establishment of groundwater source protection zones (GSPZ) to allow protective measures. The aim of this study has been to develop a new approach to groundwater source risk assessment (GSRA). The risk has been defined as the greatest of the risks identified for individual potential sources of contamination (PSCs). The risk resulting from a PSC is the combination of its adverse impact on groundwater, unwanted event probability, its adverse effect and annoyance for the population. A multi-criteria assessment has been designed to estimate the indices of potential groundwater impact of industrial facilities and non-inert waste landfills, using the range and weight method. The application of the approach proposed has been tested on an idealized model under three scenarios, involving various industrial PSCs and fertilization. The overall nitrogen load was compared to the maximum effective nitrogen load for the crops in question. The sensitivity analysis conducted for this methodology has revealed that the main factors affecting the risk to water supply are non-reactive contaminant mass load in PSC leachate and the ratio of groundwater volume abstracted from the wells to the amount of water flowing from PSCs to the wells, which determine the dilution degree of contaminant mass. This proposed interdisciplinary approach to GSRA should provide a robust basis for making decisions about GSPZ establishment and for the development of a groundwater risk analysis methodology.

scholarly journals Quantitative risk assessment and safety databases in Romanian coal mining: preliminary systematic approach

2022 ◽  
Vol 354 ◽  
pp. 00002
Author(s):  
Gabriel - Victor Vasilescu ◽  
Roland Iosif Moraru ◽  
Gabriel Bujor Bǎbuţ
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Coal Mining ◽  
Block Diagram ◽  
Mining Industry ◽  
Quantitative Risk Assessment ◽  
Assessment Process ◽  
Quantitative Risk Analysis ◽  
Management Actions ◽  
Process Guidance

Risk management is becoming increasingly more complex. Risk assessment, approached quantitatively, requires a factual database to define the likelihood of adverse health effects of workplace-related injuries and exposures, and it attempts to balance scientific knowledge with concerns of staff, investigators and administration. Practical guidance should be provided for Romanian coal mining companies to make progress in risk assessment process. Guidance is given on how to effectively introduce quantitative risk assessment in mining industry, the main goal being to highlight that the most valuable resource remains experience gained by effectively performing the process. Analyzing how various parameters are described/used, the paper aims to establish the place and role of quantitative risk analysis mining. Possibilities of developing safety/reliability database in coal mining are investigated. The block diagram describing the conceptual structure of a database on failures, safety of equipment and workers in the mining industry was developed. Because mining relies heavily on complex technologies - permanent mining facilities and large mobile equipment and support services - often located in isolated and hostile environments, the implementation of quantitative risk analysis and the development of a realistic database could be considered as a resilience business strategy and conversion of available knowledge into management actions.

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