Fig. 1.

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The Kraken computational framework. Data transfer is handled through the driver module Cerberus, which also handles the external coupling to system-scale simulations. The default configuration is based on modular solvers developed at VTT (yellow). Various third-party solvers (orange) have also been coupled to Kraken, such as the SUBCHANFLOW [6, 7] sub-channel thermal hydraulics code, and the TRANSURANUS [8] fuel performance code.

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