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Posted by Energetic
The Hamaoka Nuclear Power Plant (Hamaoka Genshiryoku Hatsudensho, Hamaoka NPP) is a nuclear power plant located in Omaezaki city, Shizuoka Prefecture, Japan managed by the Chubu Electric Power Company. There are five units contained at a single site with a net area of 1.6 square kilometers (395 acres, about a fourth of fifth of a typical US plant). A sixth unit began construction on December 22, 2008. On completion, it is expected to replace Hamaoka-1 and Hamaoka-2.
The area is in a possible epicenter of future earthquakes according to predictions. In fact, a fault line runs straight through the site. Earthquake resistance is a very important aspect of this plant, and difficulties have been seen in previous events.
|Unit||Reactor Type||Average Power Output||Capacity||Beginning of Construction||Finish of Construction||First Criticality|
|Hamaoka-1||BWR||515 MW||540 MW||June 10, 1971||August 13, 1974||March 17, 1976|
|Hamaoka-2||BWR||806 MW||840 MW||June 14, 1974||May 4, 1978||November 29, 1987|
|Hamaoka-3||BWR||1056 MW||1100 MW||June 18, 1983||January 20, 1987||August 28, 1987|
|Hamaoka-4||BWR||1092 MW||1137 MW||October 13, 1989||January 27, 1993||September 3, 1993|
|Hamaoka-5||ABWR||1325 MW||1380 MW||July 12, 2000||June 26, 2004||January 18, 2005|
The plant showed stellar performance through the 1990s, however, problems that caused Unit 1 to be shut down from 2001 to present, and Unit 2 from 2005 to present significantly hurt the capacity factor figures in the recent history of the plant.
On November 7, 2001 a valve in the HPCI system of Unit 1 ruptured during a Periodical-manual-startup-test. Since this is considered a part of the ECCS, the implications reach further the event itself, and drew into question the reliability of the emergency safety system. Unit 2 was also shut down for the purpose of investigating similar structures.
Too recent to cover the entire relevant time frame in the data above, on June 15, 2006 Unit 5 was shut down due to excessive turbine vibrations. It was discovered that a number of turbine vanes had actually completely broken off. In the turbine that failed, nearly all vanes showed fractures or cracking while the majority of the vanes of the other two low pressure turbines also showed problems. Fault for the problems were placed on Hitachi, the NSSS supplier.
|Hamaoka Nuclear Power Plant|
Image taken from the air (1988). In this image, all units through Hamaoka-3 are operating. Copyright National Land Image Information (Color Aerial Photograph), Ministry of Land, Infrastructure and Transport.
|Operator||Chubu Electric Power Company|
|Start of commercial operation||March 17, 1976|
|Reactors active||5 (4,997 MWth)|
|Total power generation in 2006||12,920 GW·h|
|Average annual generation (last 5 yrs)||17,997 GW·h|
|Net generation||468,336 GW·h|