Other Information: The limitations on the number of hydrodynamic volumes, heat structures, trips, minor edits, etc. are primarily dictated by the available memory of the computer. Dynamic allocation of storage is used for all problem-dependent data. Design of the fields used for input data can also impose limits. Problems with over 150 hydrodynamic volumes and over 100 heat structures have been run on a CYBER176 using 270K of SCM and 200K of LCM storage for input processing and less during transient analysis