> Some results were famously silly, such as ... adding the cost of nuclear war to nuclear reactors.
Is that really silly? The incremental increase in the risk of nuclear war for each gigawatt of civilian nuclear power generation might be small, but the costs of a nuclear war could be quadrillions of dollars (for example if it set the world back by 100 years).
Obviously measuring that risk is difficult, but to give an example, imagine that civilian nuclear power were limited to just the countries which currently have nuclear weapons. That would greatly reduce the proliferation risk and the chance of nuclear breakout in countries like Iran.
The urgency of addressing climate change may take precedence over these concerns in the short term, but if we do manage to reach net zero with a mixture of renewables and nuclear energy, then it's not inconceivable that over-provisioning renewables might allow us to phase out nuclear energy later on.
Suppose it would take 50 years to build up that renewable energy capacity, and 10 years to build a new nuclear power station. That would mean the nuclear power station would only be useful for 40 years, which limits the amount of time they'd have to recoup their costs over.