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.