The course also addresses safety issues both from a management and engineering perspective. Basic System Safety topics will be reviewed briefly, but this course will focus on the facility life cycle and how System Safety applies to it. Because of this, the student should have a good understanding of System Safety prior to taking this course.
Audience: This course is intended for all safety specialists, engineers, managers and facility managers. For more information, contact the PoC at your center. Facility System Safety. Facility System Safety News. Stennis Space Center applied Six Sigma principles to integrate and improve audit processes. Read More. Document ID. Document Type. Benjamin, Allan Information Systems Labs. United States. Everett, Christopher Information Systems Labs. Smith, Curtis Idaho National Lab.
Youngblood, Robert Idaho National Lab. Date Acquired. Publication Date. Subject Category. Audience : This course is intended for engineers and engineering project managers requiring a background in probability and statistics. After this presentation, a variety of issues are addressed related to estimating parameters used in PRAs. In the first part of the course, general concepts such as probability, probabilistic models, and how to represent engineering information in terms of probability distributions are presented through examples.
Later, more advanced quantification issues are discussed, such as missing data and model validation. Audience: This course is intended for those who perform safety and systems engineering analyses.
This course instructs the student in the fundamentals of System Safety management and hazard analysis of hardware, software and operations. Basic concepts and principles of the analytical process are stressed. The student is introduced to NASA publications that require and guide safety analysis, as well as to general reference texts on subject areas covered.
At the completion of this course, the student will be able to. Following this introduction, there will be a discussion of the major concepts used in PRA. Several recently completed studies that have used PRA techniques to support decision-making will be presented. Audience : This course is intended for civil servants with responsibility to perform safety and systems engineering analyses.
For more information, contact the PoC at your center. He has been instrumental in developing and implementing advanced System Safety and Risk Management techniques and processes for the agency, in addition to leading several major policy and technical procedure development tasks. Dezfuli devised a safety goal implementation framework; the conceptual work he performed in this area helped shape the NASA safety goal policy being implemented for human space flights.
He has authored many papers in the areas of safety, risk assessment and Risk Management. System Safety. System Safety System Safety is the application of engineering and management principles, criteria and techniques to achieve acceptable mishap risk within the constraints of operational effectiveness and suitability, time and cost throughout all phases of the system life cycle.
The methods of System Safety are diverse and are driven by many factors, including The high cost of testing, which limits the ability to rely on test-fail-fix strategies of safe and reliable system development and drives reliance on analytical results Increasing system complexity, which makes it necessary to leverage both traditional and modern hazard evaluation mechanisms in order to identify and analyze comprehensively the full set of credible mishap scenarios that have the potential to lead to adverse consequences, considering all hazard causes and propagation pathways through the system The development of systems that operate at the edge of engineering capability, requiring a high degree of discipline in system realization and system operation management and oversight The use of unproven technology, requiring engineering conservatism to protect against unknown mishap risks while at the same time requiring allowances for novel solutions.
System Safety News. Read More. System Safety Steering Group "The NASA System Safety Steering Group S 3 G develops Agency-wide plans and strategies to improve the: Content of the system safety discipline and competency of the System Safety workforce, especially with regard to quantitative risk modeling and analysis, systems engineering, and risk management including risk-informed decision making.
Implementation of the system safety requirements of NPR Inclusion of system safety personnel early in project development and systems engineering. Recommended Reading Learn more about System Safety and related disciplines by reading these documents and those listed in the Policy and Guidance section.
See Paper. A Vision for System Safety System Safety is the application of scientific, engineering, and management principles, criteria and techniques to optimize safety within the constraints of operational effectiveness, time and cost throughout all phases of the system life cycle. Print Version. Here, a Minuteman II launches successfully.
Photo Credit: U. Air Force. System safety emphasizes building in safety, not adding protection features to a completed design. System safety emphasizes the early identification of hazards so action can be taken to eliminate or minimize them in early design decisions; 70 to 90 percent of the design decisions that affect safety are made in concept development, requirements definition, and architectural design. The degree to which it is economically feasible to eliminate or minimize a hazard rather than to control it depends on the stage in system development at which the hazard is identified and considered.
Early integration of safety considerations into the development process allows maximum safety with minimum negative impact. The usually more expensive and less effective alternative is to design first, identify the hazards, and then add on protective equipment to control the hazards when they occur. A recent demonstration project for the Jet Propulsion Laboratory showed how safety can be designed into a spacecraft an outer-planets explorer, in this case from the early concept formation and trade study stages.
New hazard analysis approaches that include software were used. System safety deals with systems as a whole rather than with subsystems or components. Safety is an emergent property of systems, not components. One of the principle responsibilities of system safety is to evaluate the interfaces between the system components and determine the effects of component interaction. The set of components includes humans, machines, and the environment. Safety is an emergent system property.
It is not possible to determine whether a spacecraft design is acceptably safe, for example, by examining a single valve. Conclusions can be reached about the reliability of the valve defined as the probability that the behavior of the valve will satisfy its specification over time and under given conditions , but safety can only be determined by the relationship between the valve and the other spacecraft components, in the context of the whole.
System safety takes a larger view of hazard causes than just failures. A lack of differentiation between safety and reliability is widespread at NASA and elsewhere. Hazards are not always caused by component failures, and all failures do not cause hazards. Reliability engineering concentrates on component failure as the cause of accidents and a variety of techniques including redundancy and overdesign are used to minimize them. As early missile systems showed, however, losses may arise from interactions among system components; serious accidents have occurred when the system components were all functioning exactly as specified.
The Mars Polar Lander loss is an example. Each component worked as specified but problems arose in the interactions between the landing leg sensors and the software logic responsible for shutting down the descent engines.
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