Based on the different type throttling orifices in nuclear power plant, the calculating method for pressure loss was studied. Furthermore, a calculating code for pressure loss was developed. Using this calculating code, the pressure loss of the throttling orifices can be calculated quickly and accurately, and that is significant for selecting orifice and carrying out system test.%针对核电厂用不同结构形式的限流孔板分别提出了相应的压降计算方法,在此基础上编写了孔板压降计算程序,并通过试验数据进行验证.结果表明,利用该计算程序可快速准确地进行限流孔板的压降计算,对于孔板选型和系统调试具有重要意义.
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