From the view point of reliability-enhancing test

the causes of faults and statistic data in start-up commissioning of a complete 125MW unit in one power plant have been analysed. It has been pointed out that the reliability of unit NO.1 enhanced obviously during the time of start-up commissioning because of successively appeared problems having been solved one after another. But the reliability index in narrow sense without considering maintenance of units still remains at a low level until hand-over to trial production. The point estimation of a reliability-enhancing AMSAA model is given

and some forcast analyses having been carried out by using the said model. The results of analyses show

the practice being correct.