Data-acquisition, control & interlock system design for corrosion experiments of IN-RAFM steel with flowing Pb-Li in presence of magnetic field

Indian Reduced Activation Ferritic Martensitic Steel (IN-RAFMS) has been selected as the reference structural material for Lead-Lithium Ceramic Breeder Test Blanket Module (LLCB TBM). Qualification requirements for the selected structural material include assessment of compatibility, in TBM-like conditions, against flowing eutectic lead-lithium (Pb-Li) liquid metal, which is primary coolant for TBM internal structures as well as a tritium breeder and neutron multiplier. In this view, corrosion experiments are planned to be conducted at relevant temperatures and flow conditions in a dedicated pump driven experimental loop fabricated at Institute for Plasma Research (IPR). Such an experimental facility requires continuous operation over long duration along with constant monitoring and control of critical process parameters like temperature, pressure and flow. In addition, to ensure occupational safety and investment protection of associated loop components, alarms and interlocks are required to notify any off-normal condition(s) arising during loop operation and to mitigate possible accidental scenarios. To perform the intended functions, a data-acquisition, control and interlock system is designed using PXI-express technology and LabVIEW software platform. Functionality of developed system has been successfully validated in an integrated manner. This paper discusses definitions and implementation methods of control and interlock logics. Detailed design of developed system including performance of pressure control system and electromagnet interlock module is presented.