Mihama (美浜町, Mihama-chō) is a town located in Fukui Prefecture, Japan.Mihama has a Humid climate (Köppen Cfa) characterized by warm, wet summers and cold winters with heavy snowfall.[2] Per Japanese census data,[4] the population of Mihama has declined in recent decades.Following the Meiji restoration, it was organised into part of Mikata District in Fukui Prefecture.On August 9, 2004, a non-radioactive steam leak killed five and burnt twelve others in the nearby Mihama Nuclear Power Plant; the high-pressure steam pipe lost 85% of its wall thickness and failed five days before its first inspection since 1976.