# Westinghouse AP1000 reactor

13 Hacker News commenters recommended Westinghouse AP1000 reactor and 7 criticized it, November 2025 to November 2026. It was recommended in 8 of 13 months.

**Verdict:** People recommend it as a complete, buildable large reactor design that should get cheaper with repeat builds; the common caveat is that Vogtle ran over budget and late.

## Why people recommend it

- Completed design ready to build (3 comments): "Building perfectly safe and fine AP 1000s that already exist many times today and can be built whenever you want to." ([source](https://news.ycombinator.com/item?id=47257328)) "What is needed is large construction investment in existing approved designs like AP-1000 and BWRX-300" ([source](https://news.ycombinator.com/item?id=46361028)) "The AP1000 is actually quite a nice design (it actually has a completed design now)." ([source](https://news.ycombinator.com/item?id=46765091))
- Expected to get cheaper and faster (3 comments): "there is good reason to believe that future NOAK builds of the AP-1000 and of comparable reactors will be much faster and much cheaper" ([source](https://news.ycombinator.com/item?id=46249367)) "the AP1000 has a much better chance of reaching affordability than SMRs" ([source](https://news.ycombinator.com/item?id=46873053)) "Just buy a AP1400 and be done with it for far cheaper." ([source](https://news.ycombinator.com/item?id=50329342))
- Recommended over SMRs (2 comments): "Main focus of the industry by far should be deploying more AP1000s or ABWRs right now" ([source](https://news.ycombinator.com/item?id=45789757)) "the AP1000 has a much better chance of reaching affordability than SMRs" ([source](https://news.ycombinator.com/item?id=46873053))
- Replaces older Gen II reactors (2 comments): "This reactor does nearly twice as much as its predecessor using half the materials to build, at least for some systems." ([source](https://news.ycombinator.com/item?id=47966685)) "A fine reactor to replace Gen II reactors with." ([source](https://news.ycombinator.com/item?id=47965677))

## What people warn about

- Costs ran far over budget (2 comments): "The proposed costs for the Westinghouse reactors in Poland and EPR2s in France are pretty much in line with the unthinkably expensive Vogtle costs." ([source](https://news.ycombinator.com/item?id=46360092)) "It came out 20B over budget and 7 years late." ([source](https://news.ycombinator.com/item?id=49820344))
- Design not buildable or incomplete (2 comments): "Westinghouse had submitted plans for the AP-1000 to the NRC that were not actually buildable." ([source](https://news.ycombinator.com/item?id=46272527)) "The AP1000 was an incomplete design, plus the aircraft impact assessment change happened." ([source](https://news.ycombinator.com/item?id=50262183))
- Construction and supply chain problems (3 comments): "In practice the production line wasn't as controlled as it needed to be and ended up delivering modules that needed significant rework." ([source](https://news.ycombinator.com/item?id=49820475)) "didn't have the supply chain issues like with epr/ap1000" ([source](https://news.ycombinator.com/item?id=47266671)) "The real problem at Vogtle were construction logistics" ([source](https://news.ycombinator.com/item?id=46874351))

## Alternatives hackers recommend

- [CANDU reactor](https://hackerapproved.com/p/candu-reactor.md): 12 recommend

## Cite as

Hacker Approved, "Westinghouse AP1000 reactor", https://hackerapproved.com/p/ap1000-reactor/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).