THERMAL-HYDRAULIC DESIGN ANALYSIS OF A 5 MW SODIUM-COOLED TUNGSTEN TARGET

摘要

One of the main objectives of the ADTF (accelerator-driven test facility) is the demonstration of the feasibility of the accelerator-based transmutation of nuclear waste. A pre-conceptual design of an accelerator-driven, sodium-cooled subcritical multiplier assembly has been developed with a thermal power of 100 MW. A high-energy proton beam (600 MeV/5 MW) is fed to the spallation target for neutron production. In the design configuration with a solid target with tungsten plates, the subcritical assembly core and the target form two parallel flow paths cooled with sodium. The present thermal-hydraulic analysis focuses on the following aspects: 1. Cooling capability of the beam window. 2. Cooling capability of the tungsten plates. 3. Passive decay heat removal. The effect of important design parameters on the thermal-hydraulic behaviour of the target has been investigated. Based on the results achieved, reference thermal-hydraulic designs of the sodium-cooled tungsten target are proposed. Measures are recommended and assessed to enhance the thermal-hydraulic performance of the target under both normal operating conditions and passive decay heat removal conditions.