Numerical Simulation of Decontamination of Airborne Fission Products during In-Vessel Release Phase by Containment Spray

<table class="fixed-width table-group" id="tab2"><tr><td><table class="table"><colgroup><col style="width:18.00em"/><col style="width:10.19em"/></colgroup><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">LOCA event</td><td class="align_center">Time (s)</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Large break in the cold leg</td><td class="align_center">0 s</td></tr><tr><td class="align_left">Reactor trip</td><td class="align_center">2 s</td></tr><tr><td class="align_left">Start of spray system</td><td class="align_center"><svg height="8.55521pt" id="M2" style="vertical-align:-0.2063904pt" version="1.1" viewbox="-0.0498162 -8.34882 38.2628 8.55521" width="38.2628pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M324 430H196L233 583L223 592L145 529L120 430H54L29 396L31 388H111L56 126C33 15 54 -12 77 -12C137 -12 214 57 250 95L233 119C208 92 155 59 138 59C126 59 120 70 131 125L186 390L298 394L324 430Z" id="g113-117"></path></g><g transform="matrix(.013,0,0,-0.013,8.065,0)"><path d="M535 323V373H52V323H535ZM535 138V188H52V138H535Z" id="g117-34"></path></g><g transform="matrix(.013,0,0,-0.013,19.328,0)"><path d="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z" id="g113-50"></path></g><g transform="matrix(.013,0,0,-0.013,25.568,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z" id="g113-49"></path></g><g transform="matrix(.013,0,0,-0.013,31.808,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z" id="g113-49"></path></g></svg> s, 500 s, 1000 s, 1500 s</td></tr><tr><td class="align_left">LIPS activation</td><td class="align_center"><i>≅</i>260 s</td></tr><tr><td class="align_left">Release of fission product to primary circuit</td><td class="align_center">Immediate</td></tr><tr><td class="align_left">Uncovered core</td><td class="align_center"><i>≅</i>1800 s</td></tr><tr><td class="align_left">PRV failure</td><td class="align_center"><i>≅</i>3700 s</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Consequences and events in LOCA for simulation.</div>

Science and Technology of Nuclear Installations

tab2

Table 2

Table 2: Numerical Simulation of Decontamination of Airborne Fission Products during In-Vessel Release Phase by Containment Spray 