Rosatom counts 15 small reactors built and 13 in build. Most of them are icebreaker parts.

Two of the figures Rosatom quotes for this reactor are the same figure. Putting the core and steam generators inside a single pressure vessel, instead of plumbing generators and pumps outside it through large pipes, is credited with cutting the system footprint by about a third, and separately with delivering about 1.5 times the power for its physical size ^[7][8]. Remove a third of the volume and power per unit volume rises by 1/(1-1/3), which is 1.5 ^[3]. One engineering result, stated twice, and the whole programme rests on it.

The envelope is at least checkable. At 7.3 metres tall and 3.3 across ^[5], the bounding cylinder works out at roughly 62 cubic metres ^[4], which puts 175 thermal megawatts at about 2.8 MWt per cubic metre of enclosing volume ^[5]. The 15 finished units come to some 2,625 MWt of built thermal capacity, and the 13 in progress take the programme to 28 vessels ^[1][2].

Thermal is the operative word. Rosatom rates the unit at 175 MWt with a service life of at least 40 years ^[4], and no electrical figure for any variant appears in the material ^[6]. Without one, the tally cannot be set against designs marketed in megawatts electric without someone inventing an efficiency.

What the compactness actually bought was a hull. The weight and internal space it freed let the Project 22220 designers adopt a dual draft ^[9]: ballast in to sit deep and crush ice up to three metres thick, ballast out to cross the shallows at the mouths of Siberian rivers ^[10]. That is a naval requirement met by a naval reactor on a state icebreaker budget, and it explains why a production run exists at all.

The civilian claim is a derivative of that run. Both grid variants are adaptations of the same marine reactor, and on the source's own account one has reached the construction stage while the other is still being assembled into a fleet ^[11][12]. Nothing described here is yet generating for a mine or a settlement.

The count, the dimensions and the exclusivity claim all come from one party. The last of them was delivered by Rosatom's chief executive at a government meeting on nuclear infrastructure ^[2][6], which is a vendor briefing its owner, and the material offers no independent check and no comparison with anyone else's build record.

Below the RITM line sit the Shelf micro-reactor and the Kurchatov Institute's Elena, which makes heat and electricity thermoelectrically rather than through a steam turbine and is said to run autonomously for decades without routine maintenance ^[13][14]. That is the most interesting item in the catalogue and the least evidenced in it.