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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v32.i4-6.250
8 pages

Modeling of Upper Reflooding in Emergency Cooling of an Active Zone a Water-Cooled Power Reactor

Ya. D. Khodzhaev
Elektrogorsk Scientific Research Center of Safety of Atomic Power Plants, Russia

ABSTRACT

Upper reflooding in emergency cooling of the active zone of the water-cooled power reactor of the VVER-1000 type is studied. It is found that under the conditions considered the motion of the front of reflooding is determined together with the effect of heat transfer in the transient zone and the effect of heat transfer due to axial heat conduction along the channel walls (from the low- temperature zone to the high-temperature zone). A rather noticeable increase in the velocity of the wetting front with an increase in the flow rate of the supplied liquid is revealed. The increase in the velocity of the wetting front is associated with the fact that an increase in the flow rate of liquid leads to an increase in concentration of droplets in the region in front of the wetting front and, correspondingly, to improvement of heat transfer in this region.


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