核级主蒸汽安全阀热应力分析及疲劳校核

THERMAL STRESS ANALYSIS AND FATIGUE CHECK OF MAIN STEAM SAFETY VALVE FOR NUCLEAR POWER STATIONS

应用有限元软件Ansys对某核级主蒸汽安全阀样机进行温度场和热固耦合应力场计算,安全阀在工作压力和热应力作用下的应力通过静强度校核。在此基础上,计算该安全阀承压部件在各循环工况下的交变应力强度,并依据RCC-M规范对该安全阀进行疲劳分析。结果表明该安全阀样机在各循环工况能满足疲劳准则要求,具有良好的工程实用价值。

Temperature field and thermal-structure coupling stress field calculation were conducted to a main steam safety valve prototype for nuclear power stations using finite element software Ansys,and the stress of the valve subjected to operating pressure load and thermal stress was in compliance with the stress evaluation criteria.In addition,alternating stress of the pressure components for the specified cyclic operation application of loads and thermal stresses were calculated,and fatigue analysis was evaluated according to RCC-M code.Results indicate that the valve prototype is able to meet the requirements of fatigue failure criteria for the specified cycles and would have good prospects in engineering applications.