Influence of Modelling Options in RELAP5/SCDAPSIM and MAAP4 Computer Codes on Core Melt Progression and Reactor Pressure Vessel Integrity

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td align="left">Material</td><td align="left">UO<sub>2</sub> [kg]</td><td align="left">ZrO<sub>2</sub> [kg]</td><td align="left">Zr [kg]</td><td align="left">Stainless steel [kg]</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td align="left">RELAP5/SCDAPSIM</td><td align="left">12300</td><td align="left">460</td><td align="left">1300</td><td align="left">1500</td></tr><tr><td align="left">MAAP4</td><td align="left">35500</td><td align="left">8100</td><td align="left">2600</td><td align="left">4200</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Composition of molten material in the reactor vessel lower head, Group 2.

Science and Technology of Nuclear Installations

tab4

Table 4

Table 4: Influence of Modelling Options in RELAP5/SCDAPSIM and MAAP4 Computer Codes on Core Melt Progression and Reactor Pressure Vessel Integrity 