OPTIMIZATION OF THE COOLING OF THE LIPB BREEDER BLANKET FOR NET AND DEMO
Numerical thermal analysis of NET liquid eutectic LiPb water cooled breeder blanket, done during the past years of JRC Ispra, resulted in high temperatures and steep temperature gradients at the front part of the horizontal midplane of the outboard breeder region. Consequently, in order to attenuate this phenomenon, which can have detrimental effects on the corrosion rate of the austenitic stainless steel as well as on the allowable stress values, a new layout of the cooling tubes was proposed. Nonlinear finite element heat transfer simulations were performed. The aim was to check and subsequently optimize the arrangement of the cooling tubes inside each breeding unit. The criterion for this was the temperature field at the horizontal midplane section of the breeder unit closer to the plasma, which is the one submitted to the highest thermal loads. Optimized layout consisted in increasing the number of cooling tubes and repositioning them inside the breeding unit. Temperatures and gradients resulted well below the acceptable levels. The achievement of a security margin on these values for the NET heat load conditions allowed to consider the optimized solution proposed for the conditions of the breeder blanket of a DEMO reactor. For this purpose the effects of increased heat loading and different material choices were investigated. Finally, the austenitic versus martensitic steel option is discussed.
Bibliographic Reference: 15TH SYMPOSIUM ON FUSION TECHNOLOGY, UTRECHT (THE NETHERLANDS), SEPT. 19-23, 1988, AVAILABILITY: CEC-LUXEMBOURG POB 1907, MENTIONING PAPER EN 33976 ORA
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Record Number: 1989126115500 / Last updated on: 1989-06-01
Available languages: en