In the main steam pipeline of PWR nuclear power plant, when the steam turbine suddenly load rejecting, the valve of the main steam turbine is required to be suddenly closed to prevent the steam turbine from being impacted by steam. However, the steam operation in front of the valve is hindered, resulting in a sudden pressure rise, which leads to the steam hammer phenomenon.The pressure of steam hammer is solved though the simplified calculation. PIPENET software is applied to model the nuclear island main steam system between the steam generator and the main steam head pipe in HPR1000. The transient calculation function is used to simulate the occurrence and attenuation process of steam hammer. The maximum steam hammer pressure, the maximum steam hammer load in the pipe system, the time when the load occurs and the pipe position are given and calculated in the paper. The influence of the length of straight pipe section and valve closing time on the steam hammer phenomenon is analyzed,and the drawings of influence are shown in paper. The shorter the straight pipe section is, the lower the steam hammer energy is with the other conditions unchanged. The longer the valve closing time, the lower the hammer energy is.


Calculation and Analysis of Steam Hammer in Main Steam Pipe in HPR1000

Division / Sponsors: 
Power Division & Nuclear Engineering Division (NED)

Power Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2020/volume/83747

International Conference on Nuclear Engineering
Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE2020/volume/83761

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