If you use a remote sensor kit on an IC2 reactor that contains IC2 fuel cells (uranium or MOX) then it can provide the time remaining until the reactor runs out of fuel (assuming constant runtime). However this piece of information doesn't work for thorium.

NC: 2.3.3Exist
Pack: InfiTech 2

Just quoting @Blood-Asp:

Purely code on NC side. Me replacing also Uranium&Mox fuel rods in the latest GT version will also break that support currently working partly.

We'll probably have to do our own PR on his repo to get this fixed.

This or his?

Hah, I thought I was posting that to the modpack repo. But I meant that we'd probably have to make a PR here to get it fixed, as you haven't expressed any interest.

It would probably be easier if @Blood-Asp explained what changed, and @xbony2 explained what NC is actually looking for in a fuel cell.

NC used to have support for this, but it was dropped in GT5 since it removed those nuclear components. This may be relevant.

You mean the relevant GT API was removed, or the actual fuel cells were removed? GT5U (which is the only version of GT5 which is in active development) added them back in.

Both were.