Had it been a gas plant or whatever, it wouldn't have mattered. But it was a nuclear plant, and in a nuclear plant any improbable event like that is a major f* up. That's the core issue.
The numbers I heard a while was something like after first use uranium is 95-97% power, can be reused down to 15-25%. I haven't heard anyone getting this far with it, or even predictions of how radioactive it would be then.
... it would have been doing damage constantly, just by operating, in the form of emitting carbon.