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Japan’s Mount Aso volcano erupted explosively on Saturday, 8 Oct., 2016, and volcanic “ash was falling as far as 320 km (200 miles) away, … Kyushu Electric Power Co said the eruption had no impact on its Sendai nuclear plant, which is about 160 km (100 miles) south of Mount Aso“(Reuters, 8 Oct. 2016). Sendai nuclear power station has two reactors online. The other nuclear power station online is Ikata, with one reactor operating. https://en.wikipedia.org/wiki/Nuclear_power_in_Japan
Mt. Aso Sakurajima Nuclear Power Stations
Volcano locations exported from: https://en.wikipedia.org/wiki/List_of_volcanoes_in_Japan

With a change in wind direction ashfall from Mount Aso and/or Sakurajima could endanger Japan’s operating reactors. As can be seen on the map, Ikata Nuclear Power Station is closer to Mount Aso, and Sakurajima to Sendai Nuclear Power Station. Ash plume forecasts for both appear at the bottom of this post.

Disruptions due to a major volcanic eruption, as well as ashfall could lead to nuclear meltdown: https://miningawareness.wordpress.com/2015/08/15/official-volcano-evacuation-warning-near-re-opened-nuclear-reactors-in-japan-volcanic-ashfall-could-lead-to-meltdown-spent-fuel-pool-collapse/

https://miningawareness.wordpress.com/2016/08/27/japan-governor-asks-for-halt-of-sendai-nuclear-reactors/

Japan’s Mount Aso volcano erupts, no injuries reported
Posted:Sat, 08 Oct 2016 07:41:33 -0400
TOKYO (Reuters) – Mount Aso, a volcano on Japan’s main southern island of Kyushu, erupted early on Saturday, Japan’s Meteorological Agency said, spewing volcanic ash 11,000 meters (7 miles) into the sky.
http://feeds.reuters.com/~r/reuters/environment/~3/DLFdmJfALl4/us-japan-volcano-idUSKCN12804E

Mount Aso, a volcano on Japan’s Kyushu island, has been erupting sporadically for decades. Smithsonian’s Global Volcanism Program lists 38 separate eruptions since 1950, with the most recent beginning on December 8, 2014. All of these eruptions have occurred at Naka-dake, a cinder cone located within Aso’s massive caldera.
ERUPTION AT MOUNT ASO Credit: NASA Earth Observatory by Jesse Allen, using Landsat data from USGS.  Jan 13, 2015 Jan 15, 2015
ERUPTION AT MOUNT ASO Credit: NASA Earth Observatory by Jesse Allen, using Landsat data from USGS. Caption by Adam Voiland. Date: January 13, 2015 Visualization Date: January 15, 2015
http://visibleearth.nasa.gov/view.php?id=85090

Japan Meteorological Agency Active Volcanos 8 Oct. 2016
Japan Meteorological Agency: http://www.jma.go.jp/en/volcano/
Asosan Volcanic Ash Fall Forecast (Scheduled) Issued at 05:00 JST, 09 October 2016  Japan Meteorological Agency
Asosan
Volcanic Ash Fall Forecast (Scheduled)
Issued at 05:00 JST, 09 October 2016 Japan Meteorological Agency: http://www.jma.go.jp/en/ashfall/scheduled_503.html
Mt. Aso Sakurajima Nuclear Power Stations
Sakurajima Aug 19 2010 NASA
Sakurajima Aug 19 2010 NASA
Sakurajima Volcanic Ash Fall Forecast (Scheduled) Issued at 05:00 JST, 09 October 2016 Japan Meteorological Agency
Sakurajima
Volcanic Ash Fall Forecast (Scheduled)
Issued at 05:00 JST, 09 October 2016 Japan Meteorological Agency
http://www.jma.go.jp/en/ashfall/scheduled_506.html