Flux mapping system for TAPP 3 and 4

TAPP 3 and 4 reactor core requires on-line computation of the in-core flux profiles using a dedicated in-core Flux Mapping System (FMS). This system monitors the in-core detector signals located at different locations in the core and generates neutron flux profiles, 14 zonal powers and other related information. This information is generated using predefined matrices for known reactor states. The zonal powers generated by FMS are used to calculate the correction factors for the zonal powers as calculated by reactor regulating system and send these correction factors to reactor regulating system for computation of flux tilts and maintain required flux profiles. In order to meet the system requirements, redundant computer based Flux Mapping System with fault tolerant optical network connectivity is used. The paper describes the system requirements, system configuration, hardware used at different levels of the Flux Mapping system along with the dual fault tolerant optical link between various nodes of the system, and normal/diagnostic mode of operation of the system. (author)