The CFD Simulation on Grid-Spacer and Wire for Lead-Cooled Fast Reactor

Abstract

In order to separate the fuel rods along radial in one fuel assembly, there are two ways, one is using the grid-spacer, the other is using the wire-wrapped. In this paper, choose three situation (with grid-spacer, with wire-wrapped, without any of them) to show the effects of grid-spacer or wire-wrapped on average temperature, average pressure, coolant velocity, rod temperature. On the other hand, two planes (cross section at the mid-plane through the spacer and cross section 2 cm downstream of the spacer) were carried to analyze effect on temperature and velocity. The results show that the grid-spacer or wire-wrapped has little effect on the average temperature in the sub-channel. But it is clearly shown that the effect on the maximum temperature, average pressure, and coolant velocity. Moreover, local heat transfer was enhanced at the grid-spacer and wire.