I will have to strongly disagree here. The timelines are actually the main reason why I would disqualify Nuclear power as a solution to energy, even as a temporary one.

The time from inception to going online for a new Nuclear reactor is in the range of 15-25 years. Of course we could attempt to shorten that, but that would probably mean compromising on safety. So indeed, if we want to stop using fossil fuels asap, building solar, wind, and hydro, which come online in a matter of months (maybe years for hydro), is much faster.

Aggravating this are two further issues: Current Nuclear energy production is non-renewable, and supply problems are already known to occur at current energy production levels. Second, the global construction capacity is limited, probably to around current levels. Even if we do not push for faster construction times, the number of companies and indeed people who have the necessary expertise are already at full capacity, and again, expanding that would probably imply safety problems.

That is to say, currently running Nuclear power plants are save and clean, so by all means keep doing it until renewables take over. But expanding Nuclear power to solve the energy problem is a non-starter for me, due to the timeline and it being non-renewable. And that is before we start talking about the very real dangers of Nuclear power, which are not operational of course, but due to proliferation, war, and governmental or general societal instability (due to say, climate change).