Sludge lance for cleaning a steam generator

A sludge lance system for cleaning a tube bundle of a steam generator, wherein the steam generator comprises at least one hand hole opening which provides access to an elongate central tube lane within the tube bundle, wherein the elongate central tube lane defines a longitudinal axis, wherein said sludge lance system comprises:

• a mount positioned outside the steam generator;
• an index drive supported by the mount;
• and
• a sludge lance movable along the longitudinal axis of the elongate central tube lane by the index drive, wherein the sludge lance comprises:
• a proximal end;
• a distal end;
• a longitudinal rail;
• a manifold extending proximally from the longitudinal rail;
• an oscillator assembly extending from the manifold, wherein the oscillator assembly comprises a rotary output shaft;
• and
• a distal head extending distally from the longitudinal rail, wherein the distal head comprises:
• a body portion;
• a first nozzle body positioned on a first lateral side of the body portion, wherein the first nozzle body comprises a first plurality of nozzles, and wherein the first nozzle body is rotatable relative to the body portion about a first longitudinal axis in a first direction in response to a rotation of the rotary output shaft of the oscillator assembly;
• and
• a second nozzle body positioned on a second lateral side of the body portion opposite the first lateral side, wherein the second nozzle body comprise a second plurality of nozzles, wherein the second nozzle body is rotatable relative to the body portion about a second longitudinal axis in a second direction in response to the rotation of the rotary output shaft of the oscillator assembly, and wherein the second direction is opposite the first direction.