Analytical technique of lighting surges induced on grounding mesh of PWR nuclear power plant

It is noted that an analytical technique is needed to make a qualitative and predictive evaluation of transient voltages induced on local grounding meshes and instrumentation cables by a lightning strike on a lightning rod in a PWR (pressurized water reactor) power plant. An experiment with lightning surge impulses in a PWR power plant was set up to observe lightning-caused transient voltages. Experimental data are compared with EMTP (electromagnetic transient program) simulation results, and an improved simulation method is developed. The improved method provides a good estimation of induced voltages on grounding meshes and instrumentation cables. An accuracy factor of 3-5 was reached.<>