SoTeRiA: Evolution of Probabilistic Risk Assessment (PRA)

The SoTeRiA lab is at the forefront of advancing new theoretical and methodological directions for risk analysis. Grounded in the underlying science, SoTeRiA employs theory-based causal modeling to explicitly model the underlying physical and social failure mechanisms contributing to risk. The Integrated-PRA approach and use of Big Data Analytics in PRA are opening up new opportunities for risk assessment of complex socio-technical systems. By integrating physical and social causes of failure into a cohesive modeling framework, the evolution of PRA is a critical step in moving toward a new era, void of catastrophic technological accidents, where industry-academia projects are leveraged to raise social responsibility for the protection of workers, the public, and the environment.

Examples of the lab’s current research projects include:

PRA Applications for Industry

There are many diverse types of risk assessments since they are applied in different industries and for different goals, often with the commonality of the incorporation of uncertainties. SoTeRiA research is focused on the systematic safety risk of high-consequence industries (e.g., nuclear, space, aviation, healthcare, chemical processing, transportation, oil and gas, etc.). One of the promising methodologies to estimate the safety risk of high-consequence industries is Probabilistic Risk Assessment (PRA). High-consequence industries are associated with complex socio-technical systems dealing with dependencies and uncertainties, where accidents are the result of potential weaknesses that dynamically interact with each other. Due to these interactions, infrequent and rare system-level accidents with high consequences (e.g., Nuclear Power Plant accidents) can occur, therefore, developing risk analysis, by relying solely on statistical data is not adequate for understanding, predicting, and preventing these rare events. To estimate systematic risk for high-consequence industries, in 1975, the PRA methodology was developed in academia (Nuclear Engineering Department at the Massachusetts Institute of Technology) in collaboration with industry. 

PRA is now one of the key pillars of the Risk-Informed regulatory framework for the Nuclear Regulatory Commission (NRC). In addition to the NRC, a growing number of government agencies in the U.S., including the Department of Energy (DOE), the Federal Aviation Administration (FAA), the National Aeronautics and Space Administration (NASA), the Department of Defense (DOD), the Environmental Protection Agency (EPA), and the Food and Drug Administration (FDA) have begun to utilize PRA for policy setting and decision-making.