中国先进研究堆标准燃料组件堆外水力稳定性试验

中国先进研究堆（CARR）标准燃料组件由滚压在两块侧板上的21块燃料板组成。堆外水力试验的目的是考验在水力冲刷条件下燃料组件的结构稳定性。试验件是按照正式产品制造工艺制造的贫铀组件，试验平均流速为12m/s，是满功率运行流速的120％。先后试验了2个组件，第1个组件试验60d，是满功率运行时间的120％，试验后观察到固定下定位梳的销钉松动，下定位梳严重磨损了燃料板;工艺改进后制造的第2个组件试验120d，是满功率运行时间的240％，试验表明，第2个组件结构完整。试验中对组件结构稳定性和燃料板腐蚀性能，诸如组件的压差、燃料板振动、包壳表面腐蚀深度等进行了研究。

Out-of-Pile Hydraulic Stability Test of China Advanced Research Reactor Standard Fuel Assembly

The fuel assembly is the key part of a nuclear reactor. The China Advanced Research Reactor (CARR) standard fuel assembly consists of 21 fuel plates fixed to 2 side plates. The test objective is to research the hydraulic stability of the fuel assembly structure. Two CARR standard fuel assemblies were tested in the loop simulating CARR thermo-hydraulic conditions. The first assembly was tested for 60 days. It is found that the pin fixing lower comb damaged through the test, and severe damage of the comb as well as fuel plates are caused too. The second assembly was tested for 120 days after the improvement of the design and fabrication. The test shows that the assembly structure has good stability. At the same time, some important parameters were measured, such as the pressure difference of the fuel assembly, fuel plate vibration, the cladding surface corrosion depth, etc.