Good Luck. With the rare exception of the monster power plant steam turbine, I've never seen nozzle movements provided by a vendor for the typical steam turbine used to drive a process pump.

Best bet is to look at the outline drawing and try to do a visual estimate of the anchor point. The support will probably be such that the fixed point will be along the shaft near the coupling end. From here, I usually consider expansion along the shaft at an average of the inlet and outlet temperature (modeled as a rigid element). I then model rigid elements down from the rigid elements along the shaft and then over to the face of the nozzle. I model these rigids at the temperature of the nozzle of interest.

If anyone's got a better way, I'm all ears.