argumentA line of reasoning from premises to a conclusion. Like a claim, it belongs to no one who makes it.constitution →

Reference-class mismatch

againstThis argument, if it holds, weighs against the claim.constitution →Nuclear probabilistic risk assessments predicted core-damage frequencies well below the observed historical accident rate

The argument

Because the accident record is dominated by early-generation and Soviet designs that most published risk assessments did not model, a fleet-wide historical rate is not the quantity those plant-specific assessments predicted, so the comparison overstates the discrepancy; the point is reinforced by the observed decline in event rates after 1986, which makes the early record a poor guide to the fleet the assessments describe.

Does it work?

Not yet evaluated.

Premises

UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →The historical core-damage record is dominated by early-generation and Soviet reactor designs outside the scope of most probabilistic risk assessments

Where it is made

Passages where sources make, criticize or mention this argument. They record where it appears, not how strong it is, and none has precedence over another.

No source is recorded as making it.

Earlier ratings

Jul 29, 2026
The premise is largely accurate and the inference is legitimate as far as it goes: a fleet-wide historical average over designs the assessments never modelled is not the quantity the assessments predicted, so the raw comparison overstates the discrepancy. The caveat is that the argument narrows the gap rather than closing it: it lives or dies on how much of the record early-generation and Soviet designs actually account for, and the Fukushima reactors, which fall squarely inside PRA scope with predictions near one in a million reactor-years, remain unexplained by it.