The dynamic characteristics of the EOCR plant are investigated at fuli power (40 Mw). The stability margins of the various internal feed-back loops of the system as well as of the overall system with and without automatic power and temperature controls are analyzed by frequency response techniques. The reactor core is treated as a distributed system for the heat transfer representation by allowing reactor power, neutron flux, fuel plate temperature and organic temperatures to vary in time and onedimensional space. The temperature coefficients of reactivity of the coolant and moderator are considered. The heat exchanger and pneumatic temperature controller dynamics are discussed in detail as a separate system, then coupled to the reactor core. The on- off power level control system effect on stability is analyzed by describing function techniques. The equations used for an analog computer study of the overall system transient response are presented. The transient responses of the system variables are presented and discussed. Recommendations aimed at improving overall system performance are given. (auth)