Launch Vehicle Accident Assessment for Nuclear Payload Missions
This paper presents the new developments within the launch vehicle risk assessment framework in support of future NASA missions that utilize space nuclear power sources. The existing framework is an adaptation of the traditional Probabilistic Risk Assessment (PRA) used in the nuclear industry to accommodate the data made available by the launch vehicle manufacturers, the […]
Extending the Dynamic Flowgraph Methodology (DFM) to Model Human Performance and Team Effects
This report addresses the development of a structure for the modeling and analysis of control room teams to represent team related human errors of commission and omission in nuclear power plant accident scenarios. The structure includes the identification of unsafe actions (UAs) and error forcing contexts (EFCs) during abnormal or accident situations that can lead […]
The Use of the Dynamic Flowgraph Methodology for Screening Human Performance and Team Related Accident Initiating Events
Modeling and analytical features of the dynamic flowgraph methodology (DFM), a modeling framework based on multi-valued/discrete-time logic that provides users with the ability to represent the physical, functional and dynamic characteristics of a complex engineering system, are described and discussed. By providing a direct and explicit representation of both cause–effect and time-dependent system features, the […]
Development of Tools for Safety Analysis of Control Software
Software based control systems have gained a pervasive presence in a wide variety of applications, including nuclear power plant control and protection systems which are within the oversight and licensing responsibility of the US Nuclear Regulatory Commission. While the cost effectiveness and flexibility of software based plant process control is widely recognized, it is very […]
