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"... conventional water-cooled, uranium-fueled models. They produce weapons-grade waste, ..."

Power reactors don't really produce 'weapons-grade' material. That's made in reactors dedicated to the purpose, in which U-238 is exposed to neutrons long enough to turn a little of it into Pu-239, but then pulling it out before a more than a small fraction of that absorbs a second neutron to become Pu-240. It takes several weeks to refuel a light-water reactor -- open it up, swap fuel elements, close, and restart it -- so they're run as long as practical between refuelings.