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imagine how much farther ahead we would be in safety and efficiency if it was made priority 50 years ago.

we still have whole swathes of people who think that because its not perfect now, it cant be perfected ever.

That is factually false information. There are solid arguments to be made against nuclear energy.

https://isreview.org/issue/77/case-against-nuclear-power/index.html

Even if you discard everything else, this section seems particularly relevant:

The long lead times for construction that invalidate nuclear power as a way of mitigating climate change was a point recognized in 2009 by the body whose mission is to promote the use of nuclear power, the International Atomic Energy Agency (IAEA). “Nuclear power is not a near-term solution to the challenge of climate change,” writes Sharon Squassoni in the IAEA bulletin. “The need to immediately and dramatically reduce carbon emissions calls for approaches that can be implemented more quickly than building nuclear reactors.”

https://www.dw.com/en/fact-check-is-nuclear-energy-good-for-the-climate/a-59853315

Wealer from Berlin's Technical University, along with numerous other energy experts, sees takes a different view.

"The contribution of nuclear energy is viewed too optimistically," he said. "In reality, [power plant] construction times are too long and the costs too high to have a noticeable effect on climate change. It takes too long for nuclear energy to become available."

Mycle Schneider, author of the World Nuclear Industry Status Report, agrees.

"Nuclear power plants are about four times as expensive as wind or solar, and take five times as long to build," he said. "When you factor it all in, you're looking at 15-to-20 years of lead time for a new nuclear plant."

He pointed out that the world needed to get greenhouse gases under control within a decade. "And in the next 10 years, nuclear power won't be able to make a significant contribution," added Schneider.

The daft thing is that even if another Chernobyl happened (unlikely given superior technology and safety standards) it wouldn't be anywhere near as damaging as climate change.

The radiation would only affect a small area of the planet not the whole world, and technically radiation doesn't even cause climate damage. Chernobyl has plenty of trees and plenty of wildlife, it's just unsuitable for human habitation.

I totally agree that current nuclear power generation should be left running until we have enough green energy to pick up the slack, because it does provide clean and safe energy. However, I totally disagree on the scalability, for two main reasons:

1. Current nuclear power generation is non-renewable. It is somewhat unclear how much Uranium is available worldwide (for strategic reasons), but even at current production, supply issues have been known to happen. And it goes without saying that waiting to scale up some novel unproven or inexistent sustainable way of nuclear power production is out of the question, for time and safety reasons. Which brings me to point 2.

2. We need clean, sustainable energy right now if we want to have any chance of fighting climate change. From start of planning of a new nuclear power plant to first power generation can take 15 or 20 years easily. Currently, about 10% of all electricity worldwide is produced by about 400 nuclear reactors, while around 15 new ones are under construction. So, to make any sort of reasonable impact, we would have to build to the tune of 2000 new reactors, pronto. To do that within 30 years, we'd have to increase our construction capacity 5 to 10 fold. Even if that were possible, which I strongly doubt, I would wager the safety and cost impacts would be totally unjustifiable. And we don't even have 30 years anymore. That is to say nothing of regulatory checks and maintenance that would also have to be increased 5 fold.

So imho nuclear power as a solution to climate change is a non-starter, simply due to logistical and scaling reasons. And that is before we even talk about the very real dangers of nuclear power generation, which are of course not operational, but due to things like proliferation, terrorist attacks, war, and other unforseen disruptions through e.g. climate change, societal or governmental shifts, etc.

Nuclear power is the ONLY form of clean energy that can be scaled up in time to save us from the worst of climate change.

Long term nuclear is great...

But building new plants uses a shit ton of concrete. So we're paying the carbon cost up front, and it can take years or even decades to break even.

So we can't just spam build nuke plants right now to fix everything.

30 years ago that would have worked.

That's an oversimplification to the point that it is wrong. Nuclear power is not the only form of clean energy like that at all. It can not be scaled in this situation to save us, because it takes too long to build them.

I don't know natural disasters and war causing it to screw up also tends to worry people. Last time I checked wind and solar don't create massive damage to the environment when destroyed.

Just like assuming a perfectly spherical cow, or a frictionless surface, you can completely ignore the economics, the massive cost and schedule overages to make nuclear work.

Flamanville-3 in France started construction in 2007, was supposed to be operational in 2012 with a project budget of €3.3B. Construction is still ongoing, the in-service date is now sometime in 2024, and the budget has ballooned to €20B.

Olkiluoto-3 is a similar EPR. Construction started in 2005, was supposed to be in-service in 2010, but finally came online late last year. Costs bloated from €3 to €11B.

Hinkley Point C project is two EPRs. Construction started in 2017, it's already running behind schedule, and the project costs have increased from £16B to somewhere approaching £30B. Start up has been pushed back to 2028 the last I've heard.

It's no different in the US, where the V.C. Summer (2 x AP1000) reactor project was cancelled while under construction after projections put the completed project at somewhere around $23B, up from an estimate of $9B.

A similar set of AP1000s was built at Vogtle in Georgia. Unit 3 only recently came online, with unit 4 expected at the end of the year. Costs went from an initial estimate of $12B to somewhere over $30B.

Note that design, site selection, regulatory approvals, and tendering aren't included in the above. Those add between 5-10 years to the above schedules.