Development of Conceptual Design for RSG-GAS Computing Circuit Reactor Protection System

The G.A Siwabessy Multipurpose Reactor has so far been operating for more than thirty years. One of the very important systems for safety is the reactor protection system (RPS). This system is a protective measure to avoid accidents based on the measurement results of the reactor core’s neutronic physical variables, the thermohydraulic cooling system, and the radiation that monitors the release from the reactor pooL Previous research has assessed that RPS, based on modular analog electronics, is limited in spare parts and is no longer commercially produced. It means that preliminary research to understand the concept of RPS, and reverse-engineer the existing analog platform into an alternative digital platform is highly demanded. Therefore, this research aims to investigate the conceptual design of the reactor protection system to be implemented on the digital platform. This research focuses on the computing circuit of the RPS, which indicates the unique feature of this RSG-GAS. Two computing circuits of a total of four circuit calculations are selected, i.e. the unbalanced load and the negative floating limit value computing circuit. Labview programming language was employed in this research. The simulation results based on the maintenance routine manual (MRM) show that the conceptual design has similar functions to the installed analog module.