The Tomari Nuclear Power Plant is the only nuclear power plant in Hokkaidō, Japan. It is located in the town of Tomari in the Furuu District and managed by the Hokkaido Electric Power Company. All of the reactors are Mitsubishi designs. The Tomari Nuclear Power Plant was originally going to be located on an island and be named the Kyowa-Tomari NPP, but there was a change in plans and the location and name was changed.

Reactors on Tomari Nuclear Power Plant

Unit	Type	Commission date	Electric Power
Tomari - 1	PWR	June 22, 1989	579 MW
Tomari - 2	PWR	April 12, 1991	579 MW
Tomari - 3	PWR	December 22, 2009	912 MW

Events

• In 2000, a worker fell into a sump tank in the chemical control system of the plant. The worker received a high radiation dose and died in the hospital later.
• In September 2003, there was a leak in the steam generator causing about 140 liters of primary coolant to leak.
• In May 2005, there was a trespassing event where someone crossed the fence into the property. Some people had apparently been gathering bamboo sticks as a part of a part time job and when discovered, 24 arrests were made. There were all questioned due to strong concerns about terrorism at the plant.
• Also in 2005, company sensitive information was leaked from a worker's computer by a virus.
• In July 2007, there were three separate fires related to the new unit that was under construction. Electrical wiring had apparently been cut and foul play was expected. Coming just days after a more serious earthquake caused events at the Kashiwazaki-Kariwa plant, it dealt a further blow to Japan's nuclear power industry.
• On September 29, 2007, Kazutoshi Michinaka reported that there was no radiation leakage, and no one was hurt in the small fire at the half-built third reactor at Tomari Nuclear Power Plant, Hokkaidō, Japan At least 7 arson cases have been reported at the construction site this year.

Tomari Nuclear Power Plant
Country	Japan
Construction began	April 18, 1985 (1985-04-18)
Commission date	June 22, 1989 (1989-06-22)
Operator(s)	Hokkaido Electric Power Company
Reactor information
Reactors operational	2 x 579 MW 1 x 912 MW
Power generation information
Annual generation	8,554 GW·h
Net generation	138,706 GW·h