Leaked Electric Field Strength Analysis through MCR Door and Concrete Wall in Nuclear Power Plant

This paper presents a simulation of the leaked electric field strength according to the opening configuration of the MCR doors in a nuclear power plant. Threshold values exceeding the electromagnetic safety standard specified in EPRI TR-102323 Rev. 4 were derived. The simulation analyzed the electromagnetic leakage characteristics using the EMC plus tool which is based on the finite difference time domain (FDTD) method applied to an MCR door model, including the concrete wall as reported by Hitachi in the IAEA. The results based on the EPRI TR-102323 Rev. 4 show that the electromagnetic safety standard was exceeded at opening angles of 9.1° at 980 MHz and 5.7° at 2.4 GHz for the swing-type door. For the sliding-type door, the standard was exceeded at opening distances of 33 mm at 980 MHz and 19 mm at 2.4 GHz.