Sudden closure of the main steam valve in nuclear power plant will cause steam hammer occurring in the main steam pipeline

which will affect the unit safety operation.To solve this problem

the PIPENET software was employed to simulate the steam hammer process in high temperature gas-cooled reactor(HTGR).The effect of steam hammer force on the pipe safety was investigated

from the aspect of inner pressure

steam hammer force and resonance.The results show that

the main steam pipe of HTGR has adequate security margins when steam hammer occurs

so the steam hammer will not cause the pipes' resonance.Therefore

when the steam hammer occurs

the main steam system of the HTGR is safe

and it will not casue damages on human beings and the environment and the equipments.