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information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise

Just insufficient bolt tension...

February 22, 2016

Reactor coolant leak caused by weak bolt tension, Kansai Electric says

http://www.japantimes.co.jp/news/2016/02/22/national/reactor-coolant-leak-caused-weak-bolt-tension-kansai-electric-says/#.VssbKOaDmot

Kyodo

Kansai Electric Power Co. said Monday that a radioactive coolant water leak at one of its idled reactor at the Takahama nuclear plant in Fukui Prefecture was caused by insufficient tension of a bolt in a valve installed in a pipe.

The power company said Saturday that an estimated 34 liters of coolant water leaked in a building attached to the No. 4 reactor. It said the radioactivity level was below that which requires notifying the government.

Kansai Electric’s efforts to prepare the reactor for a restart have been put on hold since the leak was discovered.

It would be the fourth reactor in Japan to come back online under stricter safety rules set after the 2011 Fukushima crisis.

The No. 4 unit is also expected to become the second reactor to run on uranium-plutonium mixed oxide (MOX) fuel under post-Fukushima regulations.

MOX fuel is a key component of the nuclear fuel cycle program pursued by the nuclear power industry and the government. It is created by plutonium and uranium extracted from spent nuclear fuel.

The No. 3 reactor at the Takahama complex was brought back online in January.

See also :

Reactor coolant leak caused by weak bolt tension: Kansai Electric

http://mainichi.jp/english/articles/20160222/p2g/00m/0dm/072000c

February 22, 2016 (Mainichi Japan)

TOKYO (Kyodo) -- Kansai Electric Power Co. said Monday that a radioactive coolant water leak at an idled reactor in western Japan was caused by insufficient tension of a bolt used in a valve installed in a pipe. […]

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