I use nuclear power as backup to my solar panels + accu.
This is how its works:
If power in accus its lower than 10% turbines start working (they take steam from buffer tanks) and works until accus have 90%.
When steam in buffer tanks drop below 20k (per tank) reactor power up and process of producing steam start. Reactors are feed instant when steam is low and then are feed only 1 fuel cell at a time.
I will not share my entire setup because its few screens big (because i go mad with buffer for steam, something like 150 tanks, and 240 turbines are also big in screen).
So i will share only scheme.
Its important to know that there are 2 inner power lines and one main factory line (with accus plugged in):
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How combinators are set:
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And here comes blueprint to see it ingame:
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