Detailed analog models status report

This report presents a detailed description of various analog computer models of the NERVA system developed during CY '65 for systems and control analysis work at WANL. These models were developed prior to the agreements between WANL and REON to use a Common Analog Model for all official predictions of test performance. However, the models described in this report have been of considerable value in helping to assess the validity of several propposed versions of the Common Analog Model and will continue to be used for validation of proposed nuclear subsystem models. Included in this report are detailed descriptions of the basic NERVA-I reactor and nozzle model, EST and TCA feedsystem models, one-console NERVA-I and Nerva-II models, and PCV-18 emergency flow shutdown models. Also included is a description of the nuclear subsystem portion of the Common Analog Model II and for the EST engine system