Design and development of instrumentation & control system for lead-lithium MHD experimental loop

The Lead Lithium (Pb-Li) Magneto Hydro Dynamic (LLMHD) experimental loop is being developed to perform MHD experiments as a part of TBM R&D activities. In presence of strong plasma confining toroidal magnetic field, motion of electrically conducting liquid metal leads to MHD phenomena. These MHD flows needs to be studied for various geometrical elements as present in the LLCB TBM for the design and development of LLCB TBS. This facility consists of Pb-Li main loop and oil loop, here Pb-Li main loop extracts heat from test sections & oil loop extracts heat from Pb-Li through heat exchanger & dumps it into the water. This paper also discusses about detailed Process & Instrumentation Diagram (P&ID) emphasizing the critical Measurements & Control philosophy adopted in the loop. The main measurement and controlling parameters of the loop are flow, pressure and temperature of Pb-Li, Oil & water. The Instrumentation and Control system of the LLMHD Loop has been designed to carry out these measurements and control them. Alarms and Interlocks are provided to protect the facility under abnormal condition. A programmable logic controller (PAC T2550) is used for developing the control system for the LLMHD loop. (author)