Tsunami Hazard and Risk Assessment
Woody Epstein and Philip Watts have released a new presentation on the Tohoku Tsunami on Tsunami Hazard and Risk Assessment. Continue reading
A PRA Practioner looks at the Great East Japan Earthquake and Tsunami
Woody wrote this white paper for his sponser at the Tokyo Inst. of Tech., Professor Ninokata, at the end of April, 2011. His analysis preceded those of the NRC, MIT, HSE, and the IAEA. Continue reading
Unforeseen Events, Resilience and PRA
A 2011 update to the 2006 paper on “Unexampled Events, Resilience, and PRA”, with specific relevance to the recent events in Japan. Continue reading
What’s Wrong with the Fault-Tree Linking Approach for Complex PRA Models?
The FTL approach is subject to some limitations and approximations. Continue reading
Quantification of Fault Tree Models for Initiating Events
On the lack of accepted modeling and quantification procedures for multi-train support systems using fault trees. Continue reading
A Short History of Open PSA
The history, ideas, and activities of the Open PSA movement. Continue reading
The Emperor’s New Truncation
Approximations in risk calculations can easily be incorrect. Continue reading
Software Risk Assessment
Software used in cars, planes, and nuclear plants need risk assessment. Continue reading
Unexampled Events, Resilience, and PRA
Woody’s paper for the 2nd Resilience Engineering Symposium. Continue reading
Validation of the Open PSA Model Exchange Format
Does the Open PSA Format work? Yes, it does. Continue reading
Lisa Norris’ Death by Software Changes
Lisa Norris died from a radiation therapy machine overdose. Why? Continue reading