An energy pipe with infinite transfer for the draconic reactor.
Maybe an endgame item.

The reactor will only explode if the shield level drops to 0. If you pull too much RF from it, it will cause the cost of the shield to go up and eventually outpase the RF generated. Sounds to me like you're just not setting up the Flux Gate properly.

Attaching an Energy Pylon directly to the Flow Gate isn't fast enough?

Unfortunately no, the reactor explodes for me

OK thank you

The problem is that I don't have a cable that doesn't have a fast tranzver so that I can supply the shield

I will be overhauling the crystals at some point but Draconic energy crystals should be more than adequate unless you have increased the reactor generation config or something.
Also Reactor stabilizer -> Flow gate -> Energy pylon should allow a max configurable transfer of up to
9,223,372,036,854,775,807RF/t

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