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Current? Maybe. Since the 1750s? Nope.
Nuclear power is also a stop gap solution if you ask me. It isn't clean. It creates highly toxic waste products that nobody wants to keep stored for centuries in their backyard, just not a lot of CO2. That gets waved away a lot like it isn't an issue. It's better than burning gas, oil, or coal. It's not better than renewables in my opinion. And nuclear needs a reliable cooling chain for its survival and all the people unfortunate enough to live close by. That's normally done with water that happens to flow by the plant. If the increasing heat dries out these rivers, you'll get a slightly more stretched out version of Fukushima.
The problem is batteries. If we could have batteries that store the sun and wind energy for when sun and wind are on a break, we'd be set. We don't have that. The tech isn't there yet. And we'd probably empoverish all the countries who are unfortunate enough to have the necessary rare earths in the ground in the process. We're fucked in more ways than one.
It’s a very small amount that can be contained in secure casks and concentrated in a particular secure location in the middle of nowhere as opposed to other industrial wastes that are blasted out into the environment and our lungs.
You do need cooling water to keep a plant operational at full power by ensuring your condenser can handle all the steam coming in. If it can’t due to declining river volume then the operators must reduce power (thus making less steam which needs less condensing), if they for whatever reason were not paying attention to the alarms going off then their plant would automatically shut down for loss of condenser vacuum and restore that margin by itself. You don’t have to use rivers as the source of cooling for every nuclear reactor either though some existing ones are designed that way. You can source water from oceans, lakes, groundwater, heck you can make artificial bodies of water that are filled with surplus water and can be used in times of diminished water from whatever is used to feed them, etc.
A fair warning up top: my mind is very much made up about this. The risks of nuclear power generation from feeding the grid until the radiation mess has half-lived itself into harmlessness are too great in my opinion. And that's what this is. My opinion. I suspect yours differs. If you keep reading, you'll probably get the feeling that there isn't anything you can point out that gets through to me. Because, truthfully, it doesn't.
In my opinion, this is the waving away bit I referred to earlier. Europe doesn't have a "middle of nowhere." There is no such thing as a "secure location." There is at best one with slightly reduced risks. There are people spread out everywhere, you're going to end up in somebody's backyard who doesn't want it there. You need to be very careful that this stuff doesn't escape its container and seep into groundwater. And this needs not to happen for a minimum of a century. You're not breathing in the fumes constantly, sure. That's why it's better than a coal plant. You're risking radiation leakages over a very long time for future generations, should we survive this as a species. It's human hubris to say we can engineer around this threat on a scale of centuries.
A significant number of inland plants are built close to rivers for the perceived ease of getting the water. We just need one of them to fail unexpectedly to have a big problem. I'm not sure using groundwater for cooling is a great idea for much the same reasons as it isn't for data centers. We need to manage our water resources, especially drinking water, as Europe heats up. We need to plan for a time when there is no "surplus water." And damming up rivers is expensive and the benefits of that to the environment are limited. If we go to these lengths to preserve a nuclear fission plant we might as well built a solar farm and a wind farm.
I understand that emissions-wise nuclear fission is a great way to avoid those and it thus beats burning fossils. It's still more of a "the plague or cholera?" kind of choice between them. If everything around nuclear power plants is that great and nothing to worry about, why Three Mile, Chernobyl, and Fukushima? It's the hubris of we've got forces much more powerful than us under control. Until we don't. We've thought of everything! Until we find out we didn't. You put all of this together and that's why I think fission is a stop gap technology we should phase out completely - drastically, at the very least.