Nuclear energy

Hamaoka Nuclear Power Plant, Japan

Hamaoka Nuclear Power Plant, Japan

The Hamaoka Nuclear Power Plant is a nuclear power plant located in Omaezaki, in Shizuoka prefecture on the east coast of Japan, 200 km southwest of Tokyo.

The plant is managed by Chubu Electric Power Company.

The Hamaoka nuclear power plant is made up of five nuclear reactors. On December 22, 2008, the construction of a sixth unit began.

Hamaoka reactors 1 and 2 were shut down on January 30, 2009.

It is currently closed to update seismic systems and to increase safety in case of unforeseen events, there is no legal precedent in Japan for a plant to close in compliance with all current regulations.

How Did the Fukushima Nuclear Accident Affect the Hamaoka Power Plant?

After the events that occurred at the Fukushima Dai-ichi plant, the Prime Minister of Japan, Naoto Kan, asked the electricity company Chubu Electric Power to shut down all the reactors in the plant, as it is located in one of the most seismic areas of the world. country, until extraordinary earthquake security measures were activated.

According to calculations cited by the government, there is an 87% chance that a magnitude 8 earthquake will hit the region within 30 years. Therefore, according to Kan, the CEPC must activate extraordinary security measures in the medium and long term in the plant, to ensure that it withstands even the earthquakes of this violence: until then all reactors must remain off.

The government's decision has been criticized by many: according to some, it is too hasty and does not take into account the electricity needs of the Japanese; according to others, he is too shy because he is targeting only one of the country's many nuclear power plants.

After a brief consultation to investigate the matter: an immediate shutdown would compromise not only the electricity supply to the population, but also the supplies that CEPC is supplying to the Tokyo Electric Power Company, the company closed reactors 4 and 5 (3 was already stopped for normal recharging and maintenance work).

According to the electric company, the preliminary study carried out upstream of the construction of the plant estimated that the largest historical event, found in the Ansei-Tokai earthquake of 1854, was a 6 m high tsunami, while the site is located between 6 and 8 m and is protected by sand dunes between 10 and 15 m in height. According to preliminary requests, additional emergency diesel generators will be installed.

In late July, plans to increase protection against tsunami and floods were announced, which should be completed by December 2012. These measures consist of the construction of a new 18 m high breakwater, other interventions are the waterproofing of the emergency diesel generators, in addition to the installation of pumps in the basement of the building.

Outside power lines and another set of diesel generators will double to 25 mA In addition to physical measures, CEPC is working to develop effective ways to collaborate with local authorities and agencies in the event of a major disaster.

Reactor typeBoiling Water Nuclear Reactor (BWR)
Reactor modelBWR-4
Grid connection1974-08-13
OwnerChubu Electric Power Co.,Inc
OperatorChubu Electric Power Co.,Inc

Published: January 6, 2013
Last review: November 19, 2020

Nuclear power plants in Japan