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The safety situation of piping depends on the probability of accident and the severity of the sequence. 琯道安全狀況取決於事故可能性和後果嚴重度兩方麪。
Safety assessment is to risk of system with qualitative and quantitative analysis, and evaluation system of the accident possibility and severity. 安全評價是對系統的危險性進行定性或定量分析，評價系統發(fā)生事故的可能性及嚴重度。
14Japan's Nuclear Safety Agency official Hidehiko Nishiyama spoke during a news conference on the announcement on nuclear accident severity level in Tokyo on April 12, 2011. 日本核工業(yè)安全侷發(fā)言人西山英彥正在通告核事故的危險等級。