As pointed out in he comments below, the climate crisis will reduce political stability. And stability is essential to ensure that there will be a strong enough society left to properly decommission a nuclear plant when it will be EOL in 50 years. Decommissioning is likely to be vastly more expensive than initial construction, and after that you still need to figure out how to make sure no one will want to touch the waste for the next few thousand years.

For the current crisis we need to put a cap on carbon extraction now, and quickly bring extraction rates down to zero. Let the price of oil rise and capitalism should sort it out. Only when fossil fuel prices rise to say 500 USD per barrel will people and industries start effectively reducing consumption. Other than on extremely energy intensive activities (transatlantic flights) fossil fuel prices are just a rounding error.