Node A6 · Acronym decoder
PRA
Probabilistic Risk Assessment
What it actually means
Quantitative risk analysis that models accident scenarios end to end — initiating events, system responses, failure probabilities — to estimate the likelihood of defined consequences, using event trees and fault trees. The discipline nuclear power built and NASA adopted after Challenger; its value is making risk drivers explicit and comparable.
Where you'll meet it
Nuclear, space, and other high-consequence system safety programs.