Research Article
Containment Depressurization Capabilities of Filtered Venting System in 1000 MWe PWR with Large Dry Containment
Table 5
Containment event tree of OPR1000.
| CET Heading | Definition | Subbranch | Effect on CFVS | Remark |
| RCSFAIL | RCS fail before RV fail | No fail HL Break SGTR | — — No | Bypass |
| MELTSTOP | Core melt progression Stopped before RV fail | Melt stop RV rupture CFBRB | — — Yes | |
| ALPHA | ALPHA mode containment failure | No fail Fail | — No | Early CTMT failure |
| CR-EJECT | Amount of corium ejected out of cavity | High, medium, low | — | |
| CF-EARLY | Early containment failure | No fail Leak/Rupture | — No | Early CTMT failure |
| CS-LATE | Recirculation spray failure | No fail, fail | — | |
| EXVCOOL | Debris cooled ex-vessel | No cooled, cooled | — | |
| CF-LATE | Late containment failure | No fail Leak/rupture | — Yes | |
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