The Arabelle steam turbine is the most powerful nuclear steam turbine in operation, suitable for all reactor types, from 700 MW up to 1,900 MW.  

  • Reliability
    99,96 %*
  • Maximum output
    1,900 MW
  • Last-stage blade
    75 inches

Efficient and reliable

Arabelle steam turbine improves on the previous generation low pressure (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 moving and stationary parts. 

The Arabelle turbine has a proven reliability, with a 10 year forced outage rate of 0.04%.

Efficient power output

• A compact, powerful, efficient, and reliable turbine

• 60% of the power comes from highly efficient single flow expansion

• A unique combined HP/IP module

• Standard interface/footprint for 50 Hz and 60 Hz

Flexible LP offering

  • A range of last-stage blade sizes for each frequency (50 Hz and 60 Hz)

  • The largest last stage blade in operation (LSB69)

  • The largest last stage blade in construction (LSB75)

  • Proven blade structure with demonstrated reliability

  • Two, three or four LP modules for excellent back-pressure fit

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

Reliable blading technology

The entire family of Arabelle nuclear steam turbine blades features three-dimensional profiles engineered with high aerodynamic performance in mind. 

All rotating blades except the last stage blade (LSB) include integral shrouds to reduce loss. The resulting continuous blade structure helps create reliable and consistently good frequency control. To provide effective vibration control during service, an integral streamlined snubber interconnects the LSBs.

Arabelle turbine platform

ARABELLE 1700 ARABELLE 1000
Typical Reactor Output (50 Hz & 60 Hz) 3,500 – 4,900 MWth 2,500 – 3,500 MWth
Shaft Line Rotational Speed (50 Hz & 60 Hz) Half speed Half speed
HP/HIP Turbine Type (50 Hz) 25NHIP17 25NHIP10
HP/HIP Turbine Type (60 Hz) 30NHIP17 30NHIP10
Number of LP Turbines (50 Hz) 3 or 4 2 or 3
Number of LP Turbines (60 Hz) 3 or 4 2 or 3
Last Stage Blade Length in Inches (50 Hz) 57, 69, 75" 57, 69, 75"
Last Stage Blade Length in Inches (60 Hz) 56" 56"
Customer stories

Largest nuclear steam turbines ever made to boost U.K. grid

The two turbine islands for Hinkley Point C (HPC), will include the Arabelle steam turbine, generator, and other critical equipment. Already the largest steam turbine in operation in Taishan, China, the Arabelle produces 2% more power output than a traditional configuration and has a 99.96%* reliability rate. 

HPC’s Arabelle turbines will be the largest ever built—longer than a Boeing 747 with its associated generator —and capable of producing 1,770 MW each, enough to power 6 million homes. 

 

*Arabelle turbine 10 year forced outage rate: 0.04%