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Numerical thermal analysis of NET (Next European Torus) liquid eutectic LiPb water cooled breeder blanket found high temperatures and steep temperature gradients at the front part of the horizontal midplane of the outboard breeder region. To attenuate these phenomena, which can have detrimental effects on the corrosion rate of the austenitic stainless steel and on the allowable stress values, a new layout of the cooling tubes was proposed. Non-linear finite element heat transfer simulations were performed. This aimed to optimise the arrangement of the cooling tubes inside each breeding unit. The temperature field at the horizontal midplane section of the breeder unit closer to the plasma, is the one submitted to the highest thermal loads. Optimized layout was obtained by increasing the number of cooling tubes and repositioning them inside the breeding unit. Temperatures and gradients resulted well within the acceptable levels. The achievement of a security margin on these values, for the NET heat load conditions, allowed consideration of the proposed optimized solution for the conditions of the breeder blanket of a DEMO reactor. The effects of increased heat loading and different material choice (Austenitic or Martensitic steel) were investigated.

Additional information

Authors: ANDRITSOS F, JRC Ispra Estab. (IT)
Bibliographic Reference: Paper presented: ABAQUS Users Conference, Stresa (IT), May 24-26, 1989.
Availability: Available from (1) as Paper EN 34650 ORA
Record Number: 198910447 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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