In the year 2007, an earthquake led to massive radioactive water leakage in the largest nuclear plant in the world. In which country did it occur?

1. In July 2007, an earthquake (the Chūetsu earthquake) struck near the Kashiwazaki-Kariwa Nuclear Plant in Japan. 2. This plant, which was the largest nuclear plant in the world by net electrical power rating, suffered damage. 3. The earthquake led to various incidents, including fires and radioactive water leakage into the sea, though the amounts were reported to be below regulatory limits.