Nuclear Reactor Types
14 reactor technologies powering the world
PWR
Most Common
811
Total Reactors
382
GW Capacity
PWR59.7%
Pressurized Water Reactor
484
reactors
305
operational
BWR14.8%
Boiling Water Reactor
120
reactors
43
operational
PHWR9.1%
Pressurized Heavy Water Reactor
74
reactors
46
operational
GCR6.4%
Gas-Cooled Reactor
52
reactors
8
operational
LWGR3.1%
Light Water Graphite Reactor
25
reactors
10
operational
FBR2.3%
Fast Breeder Reactor
19
reactors
2
operational
Unknown2.0%
Unknown Type
16
reactors
0
operational
ABWR0.7%
Advanced Boiling Water Reactor
6
reactors
0
operational
HTGR0.6%
High Temperature Gas-Cooled Reactor
5
reactors
1
operational
HWGCR0.5%
Heavy Water Gas-Cooled Reactor
4
reactors
0
operational
HWLWR0.2%
Heavy Water Light Water Reactor
2
reactors
0
operational
OCR0.2%
Organic Cooled Reactor
2
reactors
0
operational
APWR0.1%
Advanced Pressurized Water Reactor
1
reactors
0
operational
SGHWR0.1%
Steam Generating Heavy Water Reactor
1
reactors
0
operational
Data source: IAEA PRIS database • Updated regularly