Design, implementation & functional aspects of the control & instrumentation system for Real Time Computer based Safety Grade Decay Heat Removal System of PFBR

Safety & reliability are of prime importance when it is referred to a nuclear power plant. In Prototype Fast Breeder Reactor (PFBR) it is achieved by the Safety Grade Decay Heater Removal (SGDHR) system which is the ultimate safety feature of PFBR. After reactor shutdown the residual fission product decay heat in PFBR is removed through this special system which is completely passive in natural convection mode using atmospheric air where no power is required. This paper details the Instrumentation & Control (I&C) designed for SGDHR system which is classified as a safety related system to monitor & control the important parameters of SGDHR with an emphasis on system design philosophy and software development methodologies.