29th Symposium on Fusion Technology (SOFT 2016)

P2.147 Dynamic thermal-hydraulic modeling of the EU DEMO breeding blanket cooling loops. Part II: WCLL

6 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 147

Poster H. Fuel Cycle and Breeding Blankets P2 Poster session

Speaker

Antonio Froio (NEMO Group)

Description

The development of a system-level thermal-hydraulic model of the whole EU DEMO tokamak has been launched by the EUROfusion Project Management Unit. In order to follow the progress in the design of the tokamak components, the model should be developed in an object-oriented fashion, to ensure a high modularity. Within this framework, the first block of the model is under development at Politecnico di Torino, to simulate the breeding blanket cooling system. The breeding blanket block of a large thermal-hydraulic model, other than being a fundamental link between the in-vessel heat source and the ex-vessel power conversion systems, can provide valuable elements to compare different coolant options, as well as different cooling scheme structures currently investigated inside the Breeding Blanket Work Package. Moreover, the model will provide suggestions to increase the heat removal efficiency of the cooling system. While the module related to the Helium-Cooled Pebble Bed (HCPB) blanket concept has already been developed and presented, this paper focuses on the model for the Water-Cooled Lithium Lead (WCLL) blanket concept, which is currently under design at ENEA Brasimone. The lumped-parameter transient model of the WCLL concept, developed using the Modelica language, is presented, and the results under steady-state loads are reported. Then, the thermal-hydraulic performances of the designs of the WCLL and HCPB as implemented into the blanket thermal module are compared for the same operating condition, in terms of the total pumping power required to keep the structures at a safe temperature.