Space flight even gives you numbers for what is acceptable, e.g.:
"It is the policy of SSC that the risk associated with each launch of rockets, balloons, UAV’s and other airspace vehicles at Esrange Space Center is controlled so that the hurt risk or casualty expectation (i.e. personal injury) to the public never exceeds 30x10-6 and that the hurt risk for personnel at Esrange Space Center never exceeds 30x10-5." [1]
which comes down to one or two deaths per a few decades being accepted for the risk. Does the power plant industry have numbers?
[1] www.sscspace.com/file/esrange-safety-manual.pdf (in Sweden)
"It is the policy of SSC that the risk associated with each launch of rockets, balloons, UAV’s and other airspace vehicles at Esrange Space Center is controlled so that the hurt risk or casualty expectation (i.e. personal injury) to the public never exceeds 30x10-6 and that the hurt risk for personnel at Esrange Space Center never exceeds 30x10-5." [1]
which comes down to one or two deaths per a few decades being accepted for the risk. Does the power plant industry have numbers?
[1] www.sscspace.com/file/esrange-safety-manual.pdf (in Sweden)