Provided are an update plan creation assistance device, an update plan creation assistance system, and an update plan creation assistance method which consider a redundant configuration of equipment and can appropriately evaluate the degree of impact on a power system from a breakdown of the equipment. The update plan creation assistance device is provided with: a breakdown information storage unit that stores information indicating the ease of occurrence of a breakdown of equipment; an operation status acquisition unit that acquires information indicating the operation status of the equipment; and a redundant information storage unit that stores information indicating a redundant configuration of the equipment. A breakdown risk calculation unit calculates a breakdown occurrence probability from information indicating the ease of occurrence of a breakdown of the equipment, and calculates, on the basis of information indicating the operation status of the equipment and information indicating the redundant configuration of the equipment, a breakdown risk that indicates the magnitude of the degree of impact on a power system from a breakdown of the equipment. An update plan creation unit creates an update plan for the equipment on the basis of the calculated breakdown risk.
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