Description of the MOD2/85 version of the RALOG/FIPLOC family. Pt. 2

This report outlines all assumptions of the lumped parameter models, the resulting differential equation systems for saturated and superheated conditions, instationary flows of atmosphere or liquid fluid as well as all other equations used to describe stationary calculations or physical states and processes. The description of the integration method contains the explicit and implicit integration part (used for the thermal hydraulic model) and the integration of the heat slab conditions (which is handled separately from the fluid dynamics). (orig./HP)