[en] The concept of building floating platform mounted nuclear power plants has motivated increasing interest in the mounting of turbine-generator sets on steel foundations rather than the more traditional concrete structures. Due to platform environmental conditions, such applications impose larger deflections on the turbine-generator foundation system than heretofore experienced. Furthermore, the platform structure being much more rigid than the turbine-generator foundation will impose almost all the cyclic wave motions and longtime dependent temperature deflections of the platform on the foundation upper deck. A method of analysis is described which predicts the dynamic response of a turbine generator foundation system on a floating platform. Results are included for a sample application