Technical Deep-Dive

Splitting a heavy nucleus (usually uranium-235) unleashes the binding energy of the atom as heat, and a self-sustaining chain reaction keeps it going — an awesome bit of physics we've learned to hold perfectly steady for years.

A fingertip-sized fuel pellet holds about the energy of a ton of coal. This single fact gives nuclear its tiny footprint, minuscule waste volume, and unmatched fuel security — no other clean, firm source comes close.

Builds on: What nuclear fission is

Fuel, moderator, coolant, control rods, and a power-conversion system. Master these five parts and you can read any reactor design — and appreciate how much room they leave for innovation.

Builds on: What nuclear fission is, Energy density: why a little fuel goes a long way

The dependable workhorse of the global fleet and one of the safest, most reliable ways humans make electricity — which is why it's the trusted baseline every new design builds on.

Builds on: How a power reactor works end-to-end

Defense-in-depth plus modern passive safety make nuclear one of the safest forms of energy ever measured — and newer designs are safer still.

Builds on: How a power reactor works end-to-end

A compact, well-understood industrial chain that uses remarkably little material — and can recycle much of it, stretching a finite resource into a centuries-long one.

Builds on: What nuclear fission is, Energy density: why a little fuel goes a long way

A genuinely exciting concept: low-pressure reactors with strong inherent safety and an abundant thorium fuel option, proven at lab scale at Oak Ridge and now being revived commercially.

Builds on: How a power reactor works end-to-end, Light-water reactors (PWR & BWR)

Factory-built reactors that could make nuclear cheaper, faster, and easier to finance by trading economies of scale for mass production. Promising and advancing fast, though the cost advantage is still being proven.

Builds on: Light-water reactors (PWR & BWR), Why nuclear costs what it costs

Tiny, transportable reactors that can bring clean, reliable power where the grid can't reach — one of the fastest-moving frontiers in energy, propelled by defense and data-center demand.

Builds on: Small modular reactors (SMRs)

Commercial used fuel is a poor route to a weapon, and decades of safeguards show the civilian fuel cycle can be run responsibly — good news for scaling nuclear up.

Builds on: The nuclear fuel cycle

An inspiring lineage: thousands of reactor-years powering the US Navy without a single reactor accident — proof nuclear can be done superbly well.

Builds on: Light-water reactors (PWR & BWR)

Regulation assumes any dose is proportionally risky (LNT); a large body of research suggests low doses are essentially harmless. A genuinely open question — and the optimistic, well-supported reading is that low-dose risk has been overstated for decades.

Builds on: Radiation, dose, and units

A current, honest scorecard of the leading advanced-reactor programs — what's funded, what's under construction, and what's still on the drawing board — as of 2025.

Builds on: Small modular reactors (SMRs), Molten-salt reactors & the thorium/LFTR concept, Microreactors & military reactors