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I used to be pro-nuclear and I am still not worried about the safety issue. However, fissile material is still a finite resource and mining for it is an ecological disaster, so I no longer am in favor of it.
Breeder reactors produce more fissile material than they consume.
As far as I can tell from looking, there are no breeder reactors for large scale power generation, there never have been, and while multiple countries are trying, none of them have actually done it.
There have been plenty. For example, the CANDU series of reactors developed in the 1950s and 60s. Breeder reactors were quite popular during the early days of nuclear power, as it was initially thought that there was maybe only 100 years' worth of (easily accessible) nuclear material on earth, rather than the thousands (or tens of thousands) of years' worth we know of now, due to both more reserves being discovered and also easier methods of fuel enrichment being developed. The fact that breeder reactors have fallen out of favour due to abundant fuel reserves certainly says something.
I know there have been plenty of breeder reactors. What I can't find is a breeder reactor in a scale large enough to generate power for a city. In fact, from what I read, that's been tried more than once without success. Can you point me to a breeder reactor that was actually a useful test case for powering a city?
The Wikipedia page for breeder reactors has a whole list you can even sort by output capacity. For example, the BN-800.
What I'm reading on Wikipedia is that none of them have been used for large scale power generation yet. Which was what I was saying. Wikipedia showing what their output capacity is does not show how long that output capacity can be maintained or how much it might fluctuate.
Otherwise, what do you think the reason is that no country has yet to use one to power any cities?
Here's the generation statistics of the BN-800 reactor I mentioned before: https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.aspx?current=451 It's been operating at about 70% of it's rated capacity basically since it was first turned on, that's large scale power generation. Breeder reactors have been in commercial use for decades (see also: Phenix and Superphenix).
The simple reason why breeder reactors aren't the default is because most reactors don't need to be breeders. The two main upsides of a breeder reactor is a) breeding of nuclear material, which as I said before was only ever a concern in the very early days of nuclear power. We have thousands of years' worth of fuel available now. b) The reuse of nuclear waste for additional power generation. Of course you have to have nuclear waste to reuse first, which necessitates many other, non-breeder reactors already being in use, so breeder reactors are usually restricted to countries that already have significant investment into nuclear power, like France, Russia, China, etc.. If you don't need to breed more nuclear fuel, and you don't have waste to reprocess you might as well keep it simple and build a regular LWR reactor.