论文部分内容阅读
船用堆瞬态变工况下燃料棒包壳温度和冷却剂压力波动较大,引起包壳的疲劳损伤,因此包壳疲劳寿命分析至关重要。本文利用ANSYS软件模拟船用堆瞬态变工况下燃料棒的热机械行为,结合锆包壳疲劳寿命设计曲线,考察包壳温度、冷却剂压力、燃料棒内压以及辐照对船用堆燃料棒包壳疲劳寿命的影响。计算结果表明,瞬态变工况使得包壳疲劳寿命有很大降低;包壳温度变化与冷却剂压力变化相比,前者对包壳疲劳寿命的影响小;辐照会降低包壳疲劳寿命。在不影响核动力船舶机动性的前提下,可采取一些必要的措施来降低包壳的疲劳损伤。
Under the transient condition of ship heap, the temperature and the pressure of the fuel rod cladding fluctuate greatly, which causes the fatigue damage of the cladding. Therefore, the analysis of the fatigue life of the cladding is very important. In this paper, ANSYS software was used to simulate the thermomechanical behavior of the fuel rods under transient conditions and the fatigue life design curves of zirconium cladding were investigated. The effects of the cladding temperature, coolant pressure, internal pressure of the fuel rods, Impact of cladding fatigue life. The calculated results show that the fatigue life of the cladding decreases greatly due to transient conditions. Compared with the changes of the coolant pressure, the changes of the cladding temperature have less effect on the fatigue life of the cladding. The irradiation will reduce the fatigue life of the cladding. Without prejudice to the mobility of nuclear-powered ships, some measures may be taken to reduce the fatigue damage of the cladding.