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原文
Overview of nuclear power valve Nuclear power plant in the valve is in the nuclear island N1, CI and conventional island power station auxiliary facilities used in the BOP system valves. From a security level is divided into nuclear safety grade Ⅰ, Ⅱ grade, Ⅲ grade, non-nuclear level. Nuclear safety requirements which the highest grade Ⅰ. Nuclear power plant valve is used in a large number of medium transport control equipment, is essential in the safe operation of nuclear power plants an important part. According to statistics, one has two 100 million KW nuclear power units have various types of valves 3 million units. Presently there are 447 nuclear power units are running, with a total installed capacity of 3.8 million KW, accounting for about 16.2% of total electricity generation. Installed capacity of nuclear power plants in 17 countries total generating capacity of its own 25% or more. France, which accounted for 77%, South Korea 38%, Japan 36%, 28% of the UK, the U.S. accounted for 20%. In the nuclear power units in operation, more than 50% for the pressurized water reactor, followed by a heavy water reactor, boiling water reactor, the graphite reactor, fast breeder reactors, high-gas-cooled reactor. Distribution of the number of valves in nuclear power plant at Daya Bay Nuclear Power Station to, for example, accounted for some 43.5% of the nuclear island, conventional island some 45%, support facilities accounted for 11.5%. The nuclear island there are various types of valves used in some 13,000 units. To see the valve configuration, accounting for 33.6% cut-off valve, diaphragm accounted for 26.2%, 12.8% valve. These three accounted for 72.6% of the nuclear island of the valve. From a security level of distribution, nuclear grade Ⅰ and only 2.3%, nuclear Ⅱ, Ⅲ grade 52% of the total, rather than the nuclear level accounted for 45.7%.
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译文：

译文：
核电阀门是指在核电站中核岛N1、常规岛CI和电站辅助设施BOP系统中使用的阀门。从安全级别上分为核安全Ⅰ级、Ⅱ级、Ⅲ级、非核级。其中核安全Ⅰ级要求最高。核电阀门在核电站中是使用数量较多的介质输送控制设备，是核电站安全运行中的必不可少的重要组成部分。据统计一座具有两台100万KW机组的核电站有各类阀门3万台。目前全球共有447个核电机组正在运行，总装机容量为3.8亿KW，约占全球总发电量的16.2％。有17个国家核电站装机容量占其本国总发电量的25％以上。其中法国占77％，韩国占38％，日本占36％，英国占28％，美国占20％。在所运行的核电机组中，50％以上为压水堆，其次有重水堆、沸水堆、石墨堆、快中子增殖堆、高气冷堆。核电站中阀门的数量分布以大亚湾核电站为例，核岛部分占43.5％、常规岛部分占45％、辅助设施占11.5％。其核岛部分使用的各类阀门共有1.3万台。以阀门配置情况看,截止阀占33.6％，隔膜阀占26.2％、球阀占12.8％。这三项占核岛阀门的72.6％。从安全等级分布看，核Ⅰ级的仅有2.3％、核Ⅱ、Ⅲ级的合计有52％，而非核级的占了45.7％。　

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