中文摘要：

针对火电厂安全评价的现状提出了一种火电厂安全评价的数学模型和方法。考虑了影响火电厂安全的关键因素，在建立了火电厂多层次指标评价体系的基础上，运用系统功能论和层次分析法来构造系统安全优势函数，以解决系统安全功能大于各予系统安全功能之和的问题。该方法整合了火电厂中各安全评价因素相互作用的协调性，可为火电厂安全管理部门进行安全评价分析和决策提供科学依据和仿真手段。实际应用结果表明，采用本文提出的数学模型和方法能够有效地对火电厂进行安全评价。

英文摘要：

According to present situation of safety assessment for power plants, a mathematical model and approach for them are proposed, in which the key factors influencing the power plants safety are considered; on the basis of establishing multi-hierarchy valuation structure for power plants, by use of system functionality and analytical hierarchy process （AHP） a preponderant function of system safety is constructed to solve the problem that the system safety function preponderates over the weight sum of safety functions of sub-systems. In order to offer scientific foundation and simulation approach for safety assessment analysis and decision-making to safety management department in power plant, the coordination of interaction among safety assessment factors of power plant is integrated. Practical applications show that by use of the proposed mathematical model and method the safety assessment of power plants can be effectively conducted.