Japan heads back to nuclear zero for reactor checkups

Kansai Electric Power engineers check readings at the Oi nuclear plant on July 19, 2012
Kansai Electric Power engineers check readings at the Oi nuclear plant on July 19, 2012. Workers will shut off generation at the plant by early Tuesday.

Workers will switch off one of Japan's two working reactors Monday, with the other set for shutdown later this month and no restarts in sight amid continued public hostility to nuclear power.

Kansai Electric Power will start reducing at its Unit No. 3 at the Oi plant, Fukui prefecture, western Japan, shortly before 5:00 pm (0800 GMT), a company spokesman said.

The reactor will be fully shut down by early Tuesday in readiness for inspections legally mandated within 13 months of the start of commercial operations, he said.

The reactor is one of the only two still generating power in Japan. The other one, Unit No. 4 at Oi, is to be switched off on September 15.

It is not known when they will resume operations because they will be assessed under a set of guidelines recently drawn up by the nuclear watchdog, according to Kansai Electric.

The two reactors were restarted—despite —in July last year after passing safety tests, ending a brief period in which no was generated in Japan. They were the only units to be brought back online after undergoing such tests in the aftermath of the disaster in March 2011 at Fukushima.

Dormant power
Graphic locating nuclear plants in Japan. The last two working reactors will be shutdown this month for testing.

There, a 9.0 magnitude earthquake and the tsunami it caused crippled reactor , sparking meltdowns and spewing in the world's worst atomic disaster since Chernobyl in 1986.

Japan has turned to pricey fossil-fuel alternatives to fill the gap left by the shutdown of atomic plants, which had supplied about one-third of resource-poor Japan's electricity before the disaster.

Operator Tokyo Electric Power (TEPCO) has been struggling to contain the crisis at Fukushima, which has been hit by a series of mishaps that have cast doubt on the utility's ability to fix the crisis.

Recent months have brought a steady stream of news about leaks of water contaminated with radiation as well as a blackout caused by a gnawing rat that left cooling pools without for more than a day.

The company said Sunday it had found highly radioactive water dripping from a pipe connecting two coolant tanks at one of four radiation hotspots.

Explore further

Japan reactor back to full power after shutdown

© 2013 AFP

Citation: Japan heads back to nuclear zero for reactor checkups (2013, September 2) retrieved 17 July 2019 from https://phys.org/news/2013-09-japan-nuclear-reactor-checkups.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments

Sep 02, 2013
Thinking about this: after WWII we engineered the recovery of Japan with these plants primarily to prove our tech superiority and to drive a tech wedge into Asia. The simplistic thinking was that the move would occur rapidly to clean fusion; the talk is still viable and the hot pools grow larger.

People are more important than tech. Perhaps a move toward heat mining from solar, water and geothermal combined will enable small nets of power to prove more valuable than a large plant that presents insurmountable dangers.

Sep 02, 2013
Geothermal is a bit dicey, as it anywhere where it has been tried it has caused earthquakes (and Japan is the one country that doesn't need any additional earthquakes).

Japan does have a huge wind and wave energy potential, though.
And since a lot of it is rocky (i.e not usable for arable land) the solar potential is also pretty big.

... and it's not like Japan lacks engineering know-how.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more