Input Calibration and Validation of RELAP5 Against CIRCUS-IV Single Channel Tests on Natural Circulation Two-Phase Flow Instability

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td align="left">Input parameter</td><td align="center">Calibrated value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td align="left">Inlet temperature correction, Tin (°C)</td><td align="center">+0.8</td></tr><tr><td align="left">Heat loss in the riser, HL R (kW)</td><td align="center">0.2</td></tr><tr><td align="left">Inlet loss coefficient, Kin (−) </td><td align="center">28</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Calibrated input parameters in the I-1, I-2 base cases.

Science and Technology of Nuclear Installations

tab4

Table 4

Table 4: Input Calibration and Validation of RELAP5 Against CIRCUS-IV Single Channel Tests on Natural Circulation Two-Phase Flow Instability 