The paper discusses the significance of aging mechanism for class 1E equipment installed in mild environment of nuclear power plants, and concludes that it is not necessary to establish the qualified life.

Some life assessment methods for easily damaged power equipment components are presented,together with methods of statistical analyzing,distribution checking, parameters estimating,and calculating for mean life,reliability as well as the reliable life.

Some design approach of reliability design and life assessment of large capacity power boiler tubes is presented, based on conventional design methods of boiler tubes.

This is the first time in this country that technically applicable creepfatigue interaction life evaluation curves have been elaborated.

In order to satisfy the requirements of durability evaluation of multiple details structure in the process of aircraft structure life evaluation,based on the probability fracture mechanics approach of durability analysis,a method is presented to calculate the structural total crack exceedance.

Researching on specified life calculation of linear rolling guide system;

It shows that the elastohydrodynamies lubrication can be gained partly by using N320 medium load industrical gear oil,and it can meet the requirement of the balling device,with the rated life as:L10=124 436 h,L1=26 132 h.