AP300

Pre-application Westinghouse Electric Company

Output

300MWe

AP300 is a light water-cooled reactor design from Westinghouse Electric Company rated at 300 MWe. The developer is engaging a regulator but has not submitted an application.

A scaled-down AP1000 reusing its components, fuel and passive safety systems, which is the argument for it: nothing in it is new. Westinghouse targeted design certification in 2027 with a first unit operating in 2033. Four units are named for North Teeside in the tracking data, all announced, none permitted.

Regulatory position

Tier	Pre-application
Regulator	UK ONR and Environment Agency, and US NRC
Application type	Generic Design Assessment
Docket / reference	UK GDA, Westinghouse AP300. NRC pre-application regulatory engagement plan
Application date	-
Review phase	Entered UK GDA Step 1 in 2024; pre-application engagement plan filed with the NRC
Decision expected	not stated

Design

Coolant	Light water
Reactor family	Pressurised water reactor (PWR)
Electrical output	300MWe
Thermal output	not disclosed
Fuel	Uranium dioxide
Enrichment	LEUUnder 5% U-235
First site	North Teeside
Offtakers	none announced

Units announced with this design

4 units in the Global Nuclear Power Tracker carry the model name "AP300", 4announced. Announcement is not permission; compare this against the regulatory position above.

Unit	Country	Status	Gross MW
North Teeside nuclear power plant 1	United Kingdom	announced	300
North Teeside nuclear power plant 2	United Kingdom	announced	300
North Teeside nuclear power plant 3	United Kingdom	announced	300
North Teeside nuclear power plant 4	United Kingdom	announced	300

Sources

World Nuclear News, Westinghouse SMR design accepted for UK review · retrieved 2026-09-06
Announced units: Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0

How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data