Why don't you merge this with the Nuclear Furnace mod.

It can be used without Nuclear Furnace mod too. All vanilla assemblers and furnaces with nuclear reactors need this extractor. So, it must be separated for using with another nuclear mods.
See this two (I think that they try to make the same nuclear assemblers/furnaces/boilers/locomotives).
https://forums.factorio.com/viewtopic.php?f=48&t=53279
https://forums.factorio.com/viewtopic.php?f=48&t=45155

dark i find out that if the old inserter was putt before the furnace by blueprint, it wouldn't work, then i would just have to rotate it 360° then it work again or just place all nuclear furnaces, then inserters ( just 2 blueprint, one without them, the other is the copy of the whole setup )

It looks like the internal problem of the Factorio, the mod checks every entity, but the base game skip them. Same problem as by locomotives.

@chris0310
Fixed, small hack can fix this issue:

    local pickup_target = inserter.pickup_target
    if not pickup_target then -- special thing, the vanilla skips update without it / darkfrei 2020-05-16
        inserter.active = false
        inserter.active = true
        pickup_target = inserter.pickup_target
    end
    if pickup_target == nil then return end