Koriyama City is located in the Naka-dori (central region) of Fukushima Prefecture. You can reach Koriyama Station from Tokyo in 75 minutes by Shinkansen (high-speed train). You can find out more about Koriyama in this brochure. (English version)
Fukushima Prefecture is located on the Pacific Ocean side in the Tohoku (literally north-east) region of Japan. Fukushima is famous for its beautiful nature, fruits and rice grown in that area, delicious sake (alcohol drink), hot springs, traditional crafts such as Aizu-nuri. There are beautiful mountains and lakes, and there is a starry sky.
In 2011, the Tohoku region, including Fukushima, suffered from a big earthquake, followed by a tsunami, a huge tidal wave (more than nine meters in height). The tsunami caused the ocean-facing nuclear power plant disaster, as you already know. Even today, the people in Fukushima continue their efforts for reconstruction and decontamination.
You can learn the work that has been done within Fukushima post-disaster and general background into the prefecture through the brochure in multiple languages (*) prepared by the Fukushima local government.
(*) Japanese, English, Chinese (Traditional and Simplified), Spanish, French
If you want to know more about the safety of Fukushima, please visit this website.