The current paper reveals the performability and maintenance decisions for the Coal Ash Handling System (CAHS) of a subcritical Thermal Power Plant (TPP). This system comprises of five subsystems i.e. Furnace, Electro Static Precipitator (ESP), Vessel, Compressor Transportation Line (CTL) and Ash Silo. Transition diagram was formulated on the basis of probabilistic approach for various subsystems. Performability model was developed through the summation of state probabilities by using the normalizing condition. Performability matrices were obtained by the numerous actions of repair and failure rates for all five subsystems. The performance for all five subsystems was estimated in the form of availability given in performability matrices. The maintenance decisions of various subsystems for CAHS are specified with the help of repair rate. It is clearly predicited from this study that ESP is most critical and ash silo is a least critical subsystem. ESP will be held on uppermost position and ash silo on lowermost position, whenever compelling the maintenance priority. The implementation of both performability and maintenance decisions by the administration of a subcritical TPP will lead to improve the system performability and reduce the total maintenance cost.

本文揭示了亚临界火力发电厂（TPP）的粉煤灰处理系统（CAHS）的性能和维护决策。该系统由五个子系统组成，即熔炉，静电除尘器（ESP），容器，压缩机运输线（CTL）和Ash Silo。转移图是在各种子系统的概率方法基础上制定的。通过使用归一化条件对状态概率求和来开发性能模型。通过对所有五个子系统的大量维修和故障率行动获得了性能矩阵。这五个子系统的性能以性能矩阵中给出的可用性形式进行了估算。CAHS各个子系统的维护决策是在维修率的帮助下指定的。这项研究清楚地表明，ESP是最关键的，灰仓​​是最不重要的子系统。每当需要进行维护时，ESP将被保持在最高位置，而灰仓将被保持在最低位置。通过管理次临界TPP来实现可执行性和维护决策，将提高系统的可执行性并降低总维护成本。