| Summary: | This article investigates the scattering characteristics inside the cabinet of a nuclear power plant by the mode-matching technique (MMT) when arbitrary wireless devices are assumed to be applied in the plant. The modal decomposition, multiregion problem, and power conservations of the MMT are introduced to confirm the scattered field inside the cabinet. It is found that stronger scattered fields are usually found when the center of the gap in the rear door of the cabinet is located <inline-formula> <tex-math notation="LaTeX">$1.5\lambda _{0}$ </tex-math></inline-formula> away from the side wall. Therefore, when determining the geometry of the cabinet and digital modules, the scattered field inside the cabinet is systematically analyzed in advance, and appropriate design guidelines for the cabinet can be suggested.
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