1 Introduction Based on the fabrication methods of forging, drilling and welding, the cooling channels in ITER shield block （SB） are drilled radial holes with flow drives. In the old design of FDR2001, the pressure...1 Introduction Based on the fabrication methods of forging, drilling and welding, the cooling channels in ITER shield block （SB） are drilled radial holes with flow drives. In the old design of FDR2001, the pressure drop in the poloidal hole was very high and it was difficult to achieve uniform flow distribution in the radial holes. In recent years, great improvements of the blanket design were made by ITER international team. One of the most important improvements is the new coolant flow configuration in the SB （See Fig.l）, where a special shape of flow driver is mounted inside the drilled radial hole, and coolant flows through clearance between the driver and the hole.展开更多
This paper presents the ageing mechanism of fuse in nuclear power plant in detail. Metal Electromigration is identified as the dominant ageing mechanism. On this basis, the dominant status indicators, temperature and ...This paper presents the ageing mechanism of fuse in nuclear power plant in detail. Metal Electromigration is identified as the dominant ageing mechanism. On this basis, the dominant status indicators, temperature and resistance of fuse were ensured, and current-temperature curve was proposed. The infrared thermal imaging technology was used to inspect the ageing condition and prove the current-temperature curve. Finally, the accelerated ageing testing was conducted abiding by the dominant ageing mechanism, and the lifetime was evaluated.展开更多
文摘1 Introduction Based on the fabrication methods of forging, drilling and welding, the cooling channels in ITER shield block （SB） are drilled radial holes with flow drives. In the old design of FDR2001, the pressure drop in the poloidal hole was very high and it was difficult to achieve uniform flow distribution in the radial holes. In recent years, great improvements of the blanket design were made by ITER international team. One of the most important improvements is the new coolant flow configuration in the SB （See Fig.l）, where a special shape of flow driver is mounted inside the drilled radial hole, and coolant flows through clearance between the driver and the hole.
文摘This paper presents the ageing mechanism of fuse in nuclear power plant in detail. Metal Electromigration is identified as the dominant ageing mechanism. On this basis, the dominant status indicators, temperature and resistance of fuse were ensured, and current-temperature curve was proposed. The infrared thermal imaging technology was used to inspect the ageing condition and prove the current-temperature curve. Finally, the accelerated ageing testing was conducted abiding by the dominant ageing mechanism, and the lifetime was evaluated.
