How does the AP1000 IRWST collect coolant after a LOCA?

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Muti
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AP600 (AP1000) has IRWST inside containment. Bottom elevation of this IRWST is just at height of RPV (hot leg) nozzle. How IRWST collect coolant after postulated LOCA from the sump.
 
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I found the answer, http://www.jsme.or.jp/monograph/pes/1999/ICONE7/PAPERS/TRACK06/FP7220.PDF describes what I wanted.
 
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