Scaling analysis on LOFA for the test model of WCCB blanket in CFETR

Abstract

The water Cooled Ceramic Breeder (WCCB) blanket, as a candidate for Chinese Fusion Engineering Test Reactor (CFETR), must demonstrate its safety before engineering application. Enough data are necessary and the test model should ensure that the data are convincing within reasonable expenses. In this paper, scaling criteria are identified for loss of flow accident (LOFA) in WCCB blanket coolant system, which guides the design scheme of test model that the length scaling factor of 1 and volume scaling factor of 1/120. Scaling analyses are performed to develop similarity criteria for pump coastdown and loop natural circulation in three temporal phases identified by LOFA simulation. The test model only preserves a branch at the sector level and sub-module level, which results in different volume scaling factors at levels. Typical heat-transferring cells, constituted by blanket components, are preserved for heat transfer similarity. By computational simulation of an ideal model, it is testified that the test model can reproduce thermal-hydraulic responses within acceptable range of the distortion.