transient calculations of coolant mixing in vver-440/213 rpv
transient calculations of coolant mixing in vver-440/213 rpv
transient calculations of coolant mixing in vver-440/213 rpv
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START UP OF THE 6 th MAIN COOLANT PUMP<br />
The purpose <strong>of</strong> the suggested benchmark was the comparison <strong>of</strong> calculation results with different<br />
codes on the effects <strong>of</strong> <strong>coolant</strong> <strong>mix<strong>in</strong>g</strong> <strong>in</strong> the VVER-<strong>440</strong>/<strong>213</strong> reactor vessel. The task <strong>of</strong> this<br />
benchmark is to <strong>in</strong>vestigate the start up <strong>of</strong> the 6th ma<strong>in</strong> <strong>coolant</strong> pump. A computation was carried<br />
out with the help <strong>of</strong> ATHLET/BIPR-VVER code <strong>in</strong> Kurchatov Institute for this <strong>transient</strong> and was<br />
repeated with ANSYS CFX 11.0 at our Institute.<br />
For the <strong>transient</strong> calculation a special vessel model has been used, which conta<strong>in</strong>ed the geometry<br />
only up to the core outlet (Fig 1). The pressure lost <strong>in</strong> the core and the effect <strong>of</strong> the core on the<br />
<strong>coolant</strong> flow was considered with a porous region model <strong>of</strong> the core. The SST turbulence model<br />
was selected for the calculation.<br />
Fig. 1: Model for the <strong>transient</strong> calculation<br />
The exam<strong>in</strong>ed situation was the start up <strong>of</strong> the 6 th loop while the other 5 loops are <strong>in</strong> normal<br />
operation. The <strong>coolant</strong> mass flow <strong>of</strong> the 6 th loop reaches the nom<strong>in</strong>al rate (~1400 kg/s) dur<strong>in</strong>g 20<br />
seconds (Fig 2).<br />
Fig. 2: Mass flow and temperature boundary conditions
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