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为了提高中子注量率水平,在建或在研的先进高通量研究试验堆需要更高的功率密度和热流密度,使得研究堆燃料元件铝合金包壳的使用温度不断提高,已接近其运行限值。本文对正常运行工况(工况1)和预计运行事件(工况2)下铝合金包壳表面温度限值及其确定方法进行研究。分析认为,对于研究堆用铝合金包壳,在工况1下包壳表面温度的主要限制因素是包壳材料的机械性能和保证冷却剂不沸腾;在工况2下按设计总则要求应保证燃料包壳不破损,具体应限制燃料芯体最高温度和包壳应力,不需要直接对包壳表面温度提出限值,但包壳表面温度与前2者仍存在关联性,应给予关注。
In order to improve the neutron fluence rate, the advanced high-throughput research reactor under construction or in research needs higher power density and heat flux density, so that the research reactor fuel element aluminum alloy cladding temperature continues to increase, is close to Operating limits. In this paper, the surface temperature limits and their determination methods of aluminum alloy cladding under normal operating conditions (working condition 1) and predicted operating conditions (working condition 2) are studied. The analysis shows that the main limiting factor for the cladding surface temperature of the research reactor for cladding the research reactor is the mechanical properties of the cladding material and to ensure that the coolant does not boil. Under the conditions of design 2, The fuel cladding is not damaged. The maximum temperature of the fuel core and the cladding stress should be limited. There is no need to directly limit the cladding surface temperature. However, there is still a correlation between the cladding surface temperature and the first two. Therefore, attention should be paid to this.