CATHARE Assessment of Natural Circulation in the PKL Test Facility during Asymmetric Cooldown Transients

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td align="left">Time [s]</td><td align="left">Measures/Events</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td align="left">0</td><td align="left">Start of Run-3. Cooldown step-1 initiated: 50°C/h cooldown gradient by SG-2 and SG-4; temperature decrease by 20°C</td></tr><tr><td align="left">90</td><td align="left">PRZ heater switched off</td></tr><tr><td align="left">1460</td><td align="left">Cooldown step-1 finished</td></tr><tr><td align="left">3270</td><td align="left">Cooldown step-2 initiated: 50°C/h cooldown gradient by SG-2 and SG-4; temperature decrease by 30°C</td></tr><tr><td align="left">5490</td><td align="left">Cooldown step-2 finished</td></tr><tr><td align="left">7750</td><td align="left">Cooldown step-3 initiated: 50°C/h cooldown gradient by SG-2 and SG-4; temperature decrease by 40°C</td></tr><tr><td align="left">14870</td><td align="left">Cooldown step-3 finished</td></tr><tr><td align="left">17520</td><td align="left">End of Run-3</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Science and Technology of Nuclear Installations

tab5

Table 5

Table 5: CATHARE Assessment of Natural Circulation in the PKL Test Facility during Asymmetric Cooldown Transients 