The automatic depressurization system (ADS) stage 4 valves inadvertent actuation scenario is one of the risk-significant cases in probabilistic risk assessment (PRA) analysis of passive power plant. Based on mini-ASTRUM (automated statistical treatment of uncertainty method) and CQD (code qualification document) method together, the calculation which utilizing WCOBRA/TRAC and HOTSPOT codes has been made in this paper. And the results indicate that, the calculated peak cladding temperature (PCT), local maximum oxidation (LMO), and core-wide oxidation (CWO) are all low enough, which meet the three design acceptance criteria defined in 10 CFR 50.46 emergency core cooling system (ECCS).

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