Safety Analysis of a High Breeding Fast Reactor Cooled by Supercritical-Pressure Light Water: Accidents and Abnormal Transients at Supercritical Pressure

The high breeding core of a supercritical water cooled fast reactor has been designed with tightly packed fuel rod assemblies to obtain a high breeding ratio and negative reactivity coefficients. A high breeding capability of less than 50 years of compound system doubling time was reported by the conceptual design study of the reactor at ICONE21. The present paper describes the safety analysis of the reactor for accidents and abnormal transients at supercritical pressure. The safety principle, safety system configuration and types of the abnormal transients and accidents are the same as those of the Super FR [1]. Safety criteria such as cladding temperature, pressure and fuel enthalpy are similar to those of Super FR. Results indicate that all safety criteria are satisfied.