Hazard analysis for high energy piping double ended break is the key content of nuclear power plants conventional island design.On the basis of summarizing the hazard analysis of conventional pipe rupture in nuclear power plants

the paper puts forward a set of methods for main steam pipe rupture hazard analysis for high temperature gas-cooled reactor

according to the characteristics of high temperature gascooled reactor.It suggests that the stress analysis method be adopted for break point selection

the simplified algorithm and thermal-hydraulics algorithm be employed for spray force calculation

and the method given in the ANSI/ANS—58.2—1988be used to compute the jet shape under two conditions

the unstinted rupture and confined finite separation rupture.The pipeline's dynamic response analysis can be realized using the finite simulation algorithm

and the over-pressure watered out effect after the double ended break occurred on the steam pipeline of the high temperature gas-cooled reaction should be analyzed according to the specific engineering arrangement of the pipelines.This analysis method provides the basis for design of main steam pipe whip restraints for high temperature gas-cooled reactor nuclear power plants.