::BEGIN_NOTE::
Forked and updated this mod to fix a bug that caused a game crash on placement of SMR. Error was in control.lua line 97-ish in regards to pushing on an undefined queue.
::END_NOTE::

Original mod description:
https://en.wikipedia.org/wiki/Small_modular_reactor

https://forums.factorio.com/viewtopic.php?f=190&t=74435

Pros
Small footprint, quick and easy to deploy in the wilderness
High energy density compared to solar or accumulators
Cons
Limited energy supply rates
Uranium fuel cells for life span required in advance
Eventually becomes depleted and must be refurbished
Efficiency penalty compared to running power lines from main grid
And since this is Factorio, Cons are just another person's Pros :-)

Other notes
5MW 10GJ / 25MW 100GJ / 50MW 500GJ
Supply priority is tertiary, same as accumulators, so an SMR on the main electricty grid is like a high-capacity accumulator that can't recharge.
SMRs retain fuel level if picked up and moved. Fuel reserve is visible as a health bar when in an inventory.
Current fuel level can be read by the circuit network, like an accumulator.