Patent ID: 7568342

Claim:
A supply pump actuating turbine comprising: at least two jet sectors configured to introduce a working gas into the turbine, each jet sector having an inlet to the turbine and the turbine being configured to drive a feed water supply pump of a steam generator; a first source of working gas; a second source of working gas; a line system connecting the at least two jet sectors to the first and second sources; and a valve arrangement configured to adjust a supply of the working gas to the jet sectors from at least one of the first and second sources according to at least three operating states, including: a first operating state, wherein the at least two jet sectors are supplied with the working gas from the first source; a second operating state, wherein the at least two jet sectors are supplied with the working gas from the second source; and a third operating state, wherein at least one of the jet sectors is supplied with the working gas from the first source and at least one other of the jet sectors is supplied with the working gas of the second source.