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新燃料运输载荷下的三维有限元分析
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Abstract:
新的核燃料制造完成后，需要通过合适的运输手段从制造厂运输到核电厂以入堆使用。在新燃料的运输过程中，由于运输设备的启动、加速以及运输道路的具体情况，会对燃料造成一定的振动和冲击，严重情况下可能会影响燃料使用。本文开展了新燃料运输载荷下的三维有限元分析，根据精细建模结果，对燃料棒进行了等效梁简化，并分析了燃料组件在运输加速度载荷下的动态响应，对芯块开展了冲击载荷下的受力分析。分析结果表明，在正常运输工况下，燃料棒包壳的最大应力远小于材料屈服强度。芯块在4 g加速度冲击载荷下，最大应力达到2140 MPa，有一定的开裂风险。
After the fresh nuclear fuel is manufactured, it needs to be transported by suitable means from the manufacturing plant to the nuclear power plant for use in the reactor. In the process of transportation of fresh fuel, due to the start and acceleration of transportation equipment and the specific conditions of transportation roads, certain vibrations and impact will be caused to the fuel, which may affect the use of fuel in serious cases. In this paper, the three-dimensional finite element analysis under the fresh fuel transport load is carried out. According to the fine modeling results, the fuel rod is simplified by equivalent beam, the dynamic response of the fuel assembly under the transport acceleration load is analyzed, and the force analysis of the pellet under the impact load is carried out. The analysis results show that the maximum stress of the fuel rod cladding is much less than the yield strength of the material under normal transport conditions. Under 4 g acceleration impact load, the maximum stress of the pellet reaches 2140 MPa, and there is a certain risk of cracking.
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