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Experimental study of three-dimensional void fraction distribution in heated tight-lattice rod bundles using three-dimensional neutron tomography

Kureta, Masatoshi   

Three-dimensional (3D) void fraction distributions in tight-lattice heated 7- and 14- rod bundles were measured by using neutron radiography 3D computed tomography (NR3DCT) and were investigated parametrically as thermal-hydraulic point of view in order to make clear the boiling phenomena in the fuel assembly of the FLWR which is an advanced BWR-type reactor. 7-rod tests were carried out to take the high void fraction data. 14-rod tests were conducted for visualization and discussion of 3D void fraction distribution from the incipient of boiling to high void fraction at the same time. The data were obtained under atmospheric pressure with mass velocity, heater power and inlet quality as the test parameter, and it was found from the data that void fraction at the channel center became higher than that at the peripheral, high void fraction spots appeared in the narrow space at the inlet and so-called "vapor chimney" is generated at the center of subchannel.

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