Compare
Putting similar-but-different things side by side is one of the fastest ways to understand them. Here are the comparisons that matter most.
PWR vs. BWR
The two light-water reactors that make up most of the world's fleet.
| Pressurized Water (PWR) | Boiling Water (BWR) | |
|---|---|---|
| Water in the core | Stays liquid under high pressure | Boils directly into steam |
| Steam to turbine | Separate, clean secondary loop | Core steam drives turbine directly |
| Turbine loop | Non-radioactive | Mildly radioactive |
| Pressure | Higher (~155 bar) | Lower |
| Share of fleet | ~2/3 of reactors | Most of the rest |
Takeaway: Both are proven and safe; the PWR's extra loop keeps the turbine side clean at the cost of higher pressure.
LNT vs. Hormesis
The genuinely unsettled question at the heart of radiation fear.
| LNT (regulatory model) | Hormesis (challenger) | |
|---|---|---|
| Claim | Any dose carries proportional risk | Low doses are harmless or protective |
| Threshold | No safe threshold | Effective threshold exists |
| Used by | Regulators worldwide | A minority of researchers |
| Evidence at low dose | Hard to measure — extrapolated | Hard to measure — debated |
| Status | Mainstream default | Not adopted by regulators |
Takeaway: This is labelled CONTESTED for good reason — both strong positions go beyond what the data firmly establish.
Nuclear vs. Gas vs. Solar
How three clean-ish sources stack up at the system level.
| Nuclear | Natural gas | Solar | |
|---|---|---|---|
| Dispatchable? | Yes (firm) | Yes (firm) | No (variable) |
| Lifecycle CO₂ | Very low | High | Low |
| Capacity factor | ~90%+ | Flexible | ~15–25% |
| Land use | Very small | Small | Large |
| Build cost | High up-front | Low | Low per panel |
| Needs backup/storage | No | No | Yes |
Takeaway: Nuclear is firm and clean but capital-heavy; solar is cheap but variable; a clean grid likely wants the firm backbone nuclear provides.
SMR vs. Large Reactor
Two bets on how to build nuclear affordably.
| Small Modular (SMR) | Large (Gen III, e.g. AP1000) | |
|---|---|---|
| Output | Under ~300 MWe | ~1,000+ MWe |
| Built | In a factory, shipped to site | On-site, piece by piece |
| Cost strategy | Economies of series production | Economies of scale |
| Up-front capital | Lower per unit | Very high |
| Proven? | Not yet at scale | Yes (Vogtle 3 & 4) |
Takeaway: Large reactors are proven but capital-intensive; SMRs are a promising but still-unproven bet on factory production.