Thermohydraulic study on natural circulation decay hear removal for a pool-type LMFBR

Thermohydraulic studies of the transition from forced to natural circulation cooling were conducted to simulate a pool-type LMFBR. A scaled experimental model using water as a working fluid was used, with its main cooling system/auxiliary cooling system secondary side operating conditions being selected as the experimental parameters during simulated scram transients. The experimental results were compared with simulated analyses in order to validate the utilized multi-dimensional code. The experimental results made clear the differences between DRACS and PRACS thermohydraulic characteristics. An observed temporary flow reversal in the blanket channel was discussed on the basis of the experimental and analytical results. (author)