[gumby]

> Yeah, exactly. The thing is, where do you draw the line of what is statistically so unlikely that you can deem it improbable?

Important question, because otherwise your costs are absurd and something important (like a power source) never gets built.

Some fields, like road construction, have a cost model built in and at some point are willing to either pull the plug or decide that a few unlikely (originally autocorrected to "unlucky!") fatalities are acceptable.