低温水冷条件下燃料棒束辐照试验方法OA

In response to the irradiation requirement of fuel rods under low-temperature water cooling conditions,a design of the capsule was carried out.Thermal-hydraulic analysis of the capsule was conducted through theoretical calculations and numerical simulations,and structural parameters were determined.An irradiation test device for fuel rods was developed,including the design and demonstration of the test section and throttling component.A measurement method for key parameters was established,and in-reactor flow rate calibration test and hot-state test were completed by the device.The results show that the capsule meets the high-temperature in-reactor irradiation requirements of fuel rods,and the temperature parameters are within the safety limits.The device can measure the coolant temperature,pressure difference,and flow rate online.The flow resistance established by the throttling component can match the core pressure drop,and the flow rate adjustment range can cover the designed flow rate of the test.During the stable operation of the research reactor,the temperature at the middle position of the cladding is 330.3～358.0℃,and the maximum linear power density of the fuel rod is 235.6～265.0 W/cm,meeting the irra-diation test index.