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Advanced nuclear water reactors rely on containment behaviour in realization of some of their passive safety functions. Steam condensation on containment walls, where non-condensable gas effects are significant, is an important feature of the new passive containment concepts, like the AP600/1000 ones.In this work the international reactor innovative and secure (IRIS) was taken as reference, and the relevant condensation phenomena involved within its containment were investigated with different computational tools. In particular, IRIS containment response to a small break LOCA (SBLOCA) was calculated with GOTHIC and RELAP5 codes. A simplified model of IRIS containment drywell was implemented with RELAP5 according to a sliced approach, based on the two-pipe-with-junction concept, while it was addressed with GOTHIC using several modelling options, regarding both heat transfer correlations and volume and thermal structure nodalization. The influence on containment behaviour prediction was investigated in terms of drywell temperature and pressure response, heat transfer coefficient (HTC) and steam volume fraction distribution, and internal recirculating mass flow rate. The objective of the paper is to preliminarily compare the capability of the two codes in modelling of the same postulated accident, thus to check the results obtained with RELAP5, when applied in a situation not covered by its validation matrix (comprising SBLOCA and to some extent LBLOCA transients, but not explicitly the modelling of large dry containment volumes).The option to include or not droplets in fluid mass flow discharged to the containment was the most influencing parameter for GOTHIC simulations. Despite some drawbacks, due, e.g. to a marked overestimation of internal natural recirculation, RELAP5 confirmed its capability to satisfactorily model the basic processes in IRIS containment following SBLOCA. 相似文献
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本文介绍一种基于现场可编程逻辑门阵列FPGA的4K图像处理系统。4K信号通过本系统的输入模块解码后,在FPGA内部可以对4K信号进行任意的处理,比如对图像进行缩小放大,去雾锐化,调节色度亮度等,以适应不同的显示要求。 相似文献
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图像DVI输出的FPGA实现 总被引:3,自引:0,他引:3
提出了一种专用图像处理卡中的图像输出子系统的设计方法,详细描述了设计流程和思考方式。他采用双握手机制、精度计数器,多频率锁相环等技术在FPGA(EP1S10)中实现了通用DVI控制模块,并通过DVI转换芯片SII164实现多格式DVI图像输出,其输出符合DVI协议和VESA通用时间公式。通过对参数的调整该子系统能很好地完成非标准图像处理领域中对特殊格式输出的需要。同时从VESA通用时间公式出发,讨论了参数的计算公式,给出了标准的计算方法。 相似文献
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介绍了如何采用数字光通信技术实现计算机视频信号的长距离传输;介绍了数字显示接口(DVI)标准的相关知识,通过项目实施解决了其中的关键技术,项目成果达到了实用化程度. 相似文献
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