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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone

Design optimization of Helium cooling systems for Indian LLCB TBM

26 Oct 2018, 08:30
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster FIP - Fusion Engineering, Integration and Power Plant Design P7 Posters


Mr Brijesh Kumar Yadav (Institute for Plasma Research, Bhat, Gandjinagar, India)


India is developing the lead–lithium cooled ceramic breeder as the blanket concept to be tested in ITER. In the Indian Lithium cooled Ceramic Breeder (LLCB) Test Blanket Module (TBM), PbLi eutectic alloy is used as multiplier, breeder, and coolant for the CB zones, and Li2TiO3 ceramic breeder (CB) is used as a tritium breeding material. The outer box structure is made of India specific Reduced Activation Ferritic Martensitic Steel (IN-RAFMS) cooled by high pressure (8.0 MPa) and high temperature (300-500 C) helium gas named as First Wall Helium Cooling System (FWHCS). The Pb-Li flow velocity is kept moderate enough such that its self-generated heat and the heat transferred from the ceramic breeder bed is extracted effectively. The Pb-Li system is cooled by another high-pressure helium system named as lead-lithium helium cooling system (LLHCS). Eventually, the two helium systems transfer the heat to Component Cooling Water System (CCWS) of ITER. In the conceptual design of LLCB TBM and its ancillary systems, two independent helium circuits were considered for extracting heat separately from the FW and the Pb-Li system. These helium systems are thermally and hydraulically independent to each other and they have their own components for operation and control. However, after detailed study, it is found that Installation and assembly of all these components along with coolant purification system in the allocated space of Tokamak Cooling Water System (TCWS) vault annex is very difficult and the existing system to be optimized to fit into the space. Accordingly, studies were carried to reduce the number of components & their sizing and schemes to combine the two independent helium systems etc. In parallel, studies were also conducted to optimize the helium flow requirements for cooling the TBM FW. In the optimized configuration, a single helium system is proposed catering the cooling requirements of FW and Pb-Li system and the main components and piping of the optimized configurations of helium system are modeled in the modified version of RELAP/MOD4.0 and transient analysis is carried out. This paper discusses the results of the optimization studies and process parameters & features of the circuit diagram of the combined helium system. Thermo-hydraulic Analysis results with the chosen optimized process parameters of the First Wall are also presented.
Country or International Organization India
Paper Number FIP/P7-6

Primary author

Mr Brijesh Kumar Yadav (Institute for Plasma Research, Bhat, Gandjinagar, India)


Mr ABHISHEK SARASWAT (InIPR) Mr Ankit Gandhi (Institute for Plasma Research) Mr Deepak Sharma (Institute for Plasma Research) Mr K.T. Sandeep Sandeep (Institute for Plasma Research) Dr Paritosh Chaudhuri (Institute for Plasma Research)

Presentation Materials