At pennies on the dollar. The P-A cap on damage is unrealistically low.
In any case, in this scenario, the insurance companies would probably invoke their "act of war" clauses. They did not use this out on the 9-11 claims, but a number of them made clear that this was a one time exception. In case of another large disaster caused by enemy action, expect the government to have to step in and bail people out.
Cow chips. If anything, the liability limits are unrealistically high. LWR technology results in very low probability for maximum credible accidents. Even if the worst happens, you'd get some local damage, in and around the plant site, but unless the media and anti-nuke kooks start stirring up and panicking the sheeple, large-scale effects are unlikely to approach the limits of P-A liability.
What are you saying is paid at pennies on the dollar? The insurance premiums? Sure, and if you know anything about insurance you will know that this is the case for any kind of liability coverage. I just renewed my automobile insurance. In my state, for the kind of cars I drive, the rates were in the couple of hundred dollar range for coverages ranging into the hundreds of thousands of dollars of liability. IOW, a penny or two on the dollar. Why? Well, its just the way liability insurance works. Check it out, if you are old enough to have to pay your way on any kind of liability insurance, and the idea of pooling coverage and spreading risk. Its a neat idea, and one of the positive outcomes of capitalism and free markets. Its just amazing...