The GE nuclear power conversion solutions for large and very large reactors are based on our Arabelle steam turbine technology platform.

Arabelle steam turbines deliver power from 700MW to 1,900MW in both 50 and 60 Hz cycles and can be adapted to any heat sink conditions with a choice of low pressure modules and types of last-stage blades. From its unique single-flow steam expansion design that improves efficiency to welded rotors and an independent LP exhaust design that lowers loads onto the foundation, Arabelle can meet the expectations of the most demanding nuclear power producers.

More MW

- Compact, powerful, efficient, and reliable
- 60% of the power comes from highly efficient single flow expansion
- Unique combined HP/IP module
- Standard interface/footprint for 50 and 60 Hz

Adapted to All Reactor Types

- Fully adaptable steam path
- Suited for any back pressure conditions
- Well-fitted for co-generation applications such as district heating or desalination

Designed for Ease of Maintenance

- Cross-under pipes below the foundation for reduced maintenance duration and costs
- Large lay-down areas alongside the LP modules
- Easier adjustment of LPs with independent structure
- Compact arrangement with fewer bladed rows

Arabelle Steam Turbines for Nuclear Power Plants Advanced and Innovative Steam Turbine Technology

With a 1,550 MW power output, Arabelle turbines are the largest turbines in operation worldwide for the past 18 years.

The unique architecture of the Arabelle turbine results in the steam first expanding in a singleflow high pressure (HP) path. Then, after moisture separation and reheat, it expands in a single-flow intermediate pressure (IP) section before going through the four, six, or eight low pressure (LP) flows.

LP Exhaust with Independent Structure

Arabelle improves on the previous generation LP exhaust design with fully independent LP cylinders. By connecting the LP inner casing to an end wall rather than the LP outer casing and ultimately the turbine table, the outer casing no longer needs to act as support. 

This simple but powerful design innovation greatly reduces turbine load on the foundation, caused by vacuum variations or condenser forces while improving centering of both moving and stationary parts.


Efficient, Reliable Blading

The entire family of Arabelle turbine blades features a three-dimensional profile engineered with high aerodynamic performance in mind.

All rotating blades except the last stage blade (LSB) include integral shrouds to minimize loss. Manufacturing the blades as a unit eliminates loose parts. A forked and pinned root fastening design unites the blades, and the sealing ribs are machined post-assembly. The resulting continuous blade structure helps ensure reliable and consistently good frequency control.

Product Specifications

Typical Reactor Output

3500 – 4900 MWth

2500 – 3500 MWth

Shaft Line Rotational Speed Half speed Half speed
50 Hz
Number of LP Turbines

3 or 4

2 or 3

Last Stage Blade Length in inches (“)

57, 69, 75

57, 69, 75

60 Hz
HP/HIP Turbine Type 30NHIP17 30NHIP10
Number of LP Turbines 3 2 or 3
Last Stage Blade Length in Inches (“) 56 56
Reactor Type



Configuration  Combined HIP Combined HIP
Number of LP Turbines 3 2
LP Turbine Type LP69 LP57
Frequency (Hz) 50 50
Speed (rpm) 1500 1500
Output (MWe) 1750 1080
Heaviest Lift – LP Rotor (tons) 280 190
Power Train Width (m) 20 17
Hook Height (m) 15 14.5
Power Train Length including Generator (m) 70 56