Universal inverted reactor

A fission reactor, comprising:

• a shell encompassing a reactor space having a longitudinal axis;
• an axial cylinder including an inner diameter surface defining a central longitudinal channel having an axis that is co-located with the longitudinal axis of the reactor space;
• a plurality of axially extending rings located within the reactor space and concentrically positioned relative to the axial cylinder, wherein the plurality of axially extending rings are radially separated forming, for any two adjacent axially extending rings, both a radially inward adjacent ring and a radially outward adjacent ring, and wherein an outer diameter surface of the radially inward adjacent ring and an inner diameter surface of the radially outward adjacent ring define an annular cylindrical space;
• a first plurality of primary axial tubes located circumferential within the annular cylindrical space, wherein each primary axial tube includes an inner diameter surface forming a primary channel and an outer diameter surface;
• a plurality of webbings, wherein the outer diameter surface of each of the plurality of primary axial tubes is connected to the radially inward adjacent ring by a first webbing and is connected to the radially outward adjacent ring by a second webbing;
• a plurality of secondary channels within the cylindrical space, wherein circumferentially adjacent primary axial tubes are separated by one of the plurality of secondary channels;
• and
• a fissionable nuclear fuel composition located in at least some of the plurality of secondary channels.