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Japan’s Fault: The Risks of Mt. Fuji’s Eruption and Nuclear Power

Read in Japanese (日本語), Spanish, German, and French.

by Akio Matsumura

 

Please see this response from Jorge Zanelli, theoretical physicist  and former head of a presidential commission to assess the nuclear option for Chile.

 

What if Mt. Fuji erupts? The question seems random and provocative, but it is one we should be asking.

The Great Tohoku Earthquake that caused the Fukushima nuclear power plants disaster in March 2011 has caused scientists to worry that Mt. Fuji could erupt in the next two years.

Several indicators – increased pressure in the magma chamber, receding lake water levels nearby, cracks in the crust – signal that the volcano, dormant for 300 years, has been affected by recent seismic activity (Japan Today). A study released July 27 by the National Institute of Advanced Industrial Science and Technology in Japan concluded that Mt. Fuji has erupted 43 times in total over the past 2,000 years, the Yomiuri Shimbun reported.

There is a strong precedent for large earthquakes (>M9.0) causing volcanic eruptions within three years:

  • December 26, 2004 at Sumatra, Indonesia. Earthquake M9.2 –Talang Volcano erupted April 12, 2005. And Tangkuban Perahu at West Java, Indonesia erupted March 13, 2005.
  • March 27, 1964 at Alaska, USA. Earthquake M9.2 – Redoubt Volcano erupted January 24, 1966.
  • May 22, 1960 at Valdivia, Chile. Earthquake M9.5 – Cordon Caulle erupted May 24, 1960.

 

No one can predict with accuracy when an eruption will occur, but to ignore the possibility that an eruption might occur — whether in 1, 5, 20, or 100 years — is dangerous and irresponsible.… Continue reading

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NYT: High Levels of Strontium Found in Groundwater Near Fukushima Plant

Read in Japanese (日本語 ), French and German.

 

A June 18 New York Times article by Hiroko Tabuchi — “High Levels of Radioactive Strontium Found in Groundwater Near Fukushima Plant” — alerted us that Tepco has found strontium-90 and tritium well above their legal limits in the groundwater at the Fukushima Daiichi site:

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Diagram from the Asahi Shimbun

Tokyo Electric Power, the operator of the stricken nuclear power plant at Fukushima, said Wednesday that it had detected high levels of radioactive strontium in groundwater at the plant, raising concerns that its storage tanks are leaking contaminated water, possibly into the ocean. The operator said it had found strontium-90 at 30 times Japan’s safety limit in groundwater near its No. 2 reactor, which suffered a fuel meltdown in 2011. The company has struggled to store growing amounts of contaminated runoff at the plant, but had previously denied that the site’s groundwater was highly toxic. If ingested, strontium-90 can linger in bones, emitting radiation inside the body that can lead, in time, to cancer.

Nuclear expert Dr. Gordon Edwards, president of the Canadian Coalition for Nuclear Responsibility, helps explain the effects of exposure to Tritium and Strontium-90.

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Dr. Gordon Edwards

 

Explaining Radiation
During the Fukushima Dai-ichi disaster in March 2011, hundreds of different types of radioactive materials were disseminated into the environment.

Like all material things, radioactive substances are made up of atoms. However, the atoms of a radioactive material are unstable, unlike most of the atoms in most of the materials around us in everyday life, which are stable.… Continue reading

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Experts Explain Effects of Radioactive Water at Fukushima

Read in French, German and Japanese.

 

Introduction

by Akio Matsumura

Contaminated water is posing a new problem at the Fukushima site. Tepco must continue to cool the irradiated fuel rods, but has not devised a permanent and sustainable disposal process for the highly radioactive contaminated water that results. While they have a process that can remove much of the radiation from the water, some elements like tritium – a carcinogen – cannot be removed and is concentrating at magnitudes much higher than is legal. Tepco wants to spill the water into the Pacific Ocean in order to dilute the tritium levels to legal amounts, but fishermen skeptical of the power company oppose the move. Meanwhile, Tepco is storing the contaminated water in tanks. Unsurprisingly, those tanks are leaking (NYT). They admit they will eventually run out of space for the storage tanks.

Management of the contaminated cooling water has come to be the most demanding and dangerous issue that Tepco has faced since 2011.

Fukushima Water


Background

According to the Japan Times (excerpted):

As of May 7, Tepco had routed 290,000 tons of radioactive water into some 940 huge tanks at the complex, but 94,500 tons remain inside the basement floors of the reactor buildings and other facilities.

Tepco must perpetually pour water over the melted cores of reactors 1, 2, and 3 via makeshift systems to prevent the fuel from melting and burning again.

But the cores’ containment vessels were damaged by the meltdowns, allowing the highly radioactive coolant water to leak and flow into the basements.

… Continue reading