Quality control of in-service inspection in nuclear island
During the refueling outages of PWRs, ISI in nuclear island will contribute to find the equipment degradation generated during its normal operation, which can lay a foundation for the safe operation of nuclear power plant. ISI of nuclear island equipment was carried out from two sides: implementation and management. A detailed process of nondestructive testing and quality control during the preparation stage, project implementation stage and postsession integration stage was presented in accordance with the project procedures. Main responsibilities of quality control personnel stand out in the whole process.
Discussion on in-service inspection of nuclear power plant
In-service inspection is periodic inspection of pressure-retaining safety components of nuclear power plant, and is important work during the design life of nuclear power plant. From licensee’s standpoint, this paper expounds systems of organization and documentation, main keystones in each stage, and personnel arrangement for in-service inspection of nuclear power plant.
Flow in a branching open channel: a review
Branching channel flow refers to any side water withdrawals from rivers or main channels. Branching channels have wide application in many practical projects, such as irrigation and drainage network systems, water and waste water treatment plants, and many water resources projects. In the last decades, extensive theoretical and experimental investigations of the branching open channels have been carried out to understand the characteristics of this branching flow, varying from case studies to theoretical and experimental investigations. The objectives of this paper are to review and summarise the relevant literatures regarding branching channel flow. These literatures were reviewed based on flow characteristics, physical characteristics, and modeling of the branching flow. Investigations of the flow into branching channel show that the branching discharge depends on many interlinked parameters. It increases with the decreasing of the main channel flow velocity and Froude number at the upstream of the branch channel junction. Also it increases with the increasing of the branch channel bed slope. In subcritical flow, water depth in the branch channel is always lower than the main channel water depth. The flow diversion to the branch channel leads to an increase of water depth at the downstream of the main channel. From the review, it is important to highlight that most of the study concentrated on flow characteristics in a right angle branch channel with a rigid boundary. Investigations on different branching angles with movable bed have still to be explored.