nuclear-news

Nuclear fusion is a never-ending dream

BY CITIZENS’ NUCLEAR INFORMATION CENTER ·  APRIL 5, 2023, By Nishio Baku (CNIC Co-Director)

Green Transformation (GX) Basic Policy proposed by the Japanese government mentions nuclear fusion as one of the next-generation innovative nuclear technologies in its reference information. I doubted my ears when I learned that the Nuclear Energy Subcommittee of the ministerial Advisory Committee for Natural Resources and Energy, which drafted the policy, brought up nuclear fusion as one of the “innovative technologies” to be pursued.

It was a big surprise. That is the very nuclear fusion that, at the Second International Conference for the Peaceful Uses of Atomic Energy of September 1 through 13, 1958 in Geneva, Dr. H. J. Bhabha from India, who chaired the conference, flamboyantly predicted would take shape in 20 years. It has been 64 years since then. The government refers to this vintage technology as “innovative”.

During the decade of the 1980s, various Japanese universities received more budget than previously from the government for nuclear fusion research. The website of professor Takabe Hideaki, Institute of Laser Fusion, Osaka University, notes on September 10, 2014 that, during the days of the Second Oil Crisis, when Gekko XII [the experimental laser fusion apparatus at Osaka University] was completed, the government’s top-down initiative provided the university with a budget of 30 billion yen (in the value of the yen at the time), to build the laser system and a robust building for it.

 I find this maybe a special case (another document I have with me says, of the fiscal 1984 national budget, 35 billion yen was given to the then Power Reactor and Nuclear Fuel Development Corporation and a total of 7 billion yen to universities). Uramoto Joshin, a former associate professor at the National Institute for Fusion Science, wrote in his retirement memoir “My Final Words as a NIFS Staff” (NIFS News, May 1998), that he was in a festive mood around the time when he joined the former Plasma Research Institute of Nagoya University, which was one of the founding bodies of the NIFS. 

The boom faded, and in 1989, the Plasma Research Institute was reorganized as the National Institute for Fusion Science, an inter-university research institute, into which a part of the Heliotron Plasma Physics Laboratory at Kyoto University and a part of the Institute for Fusion Theory at Hiroshima University were incorporated. The technology that the government refers to is the same nuclear fusion.

In what respect can the nuclear fusion reactor be a “next-generation innovative reactor”? While there is no full-size nuclear fusion reactor, what would a “compact nuclear fusion reactor” look like?

Today, “private-sector nuclear fusion” by venture companies seems to be enjoying a global boom………………………………………………. the project did not seem very practical.

……………………………………………………………. Whatever the case, the ignition lasts only one instant.

How far will the muddy road continue?

This nuclear fusion was mentioned by Prime Minister Kishida in his administrative policy speech on January 17, 2022 with the cryptic reasoning that it would help achieve the 2050 goal of carbon neutrality. Using this as the basis, the government set up the Nuclear Fusion Strategy Expert Panel under the Integrated Innovation Strategy Promotion Council of the Cabinet Office.

The panel had its first meeting on September 30, where Takaichi Sanae, Minister of State for Science and Technology Policy, said: “I have a strong will to accelerate the efforts to commercialize nuclear fusion technology as far as possible.” However, the Innovative Reactor Working Group placed under the Nuclear Energy Subcommittee, states in its “Roadmap for Introduction” (August 9, 2022) that whether the construction of a prototype nuclear fusion reactor should start or not will be determined in the mid-2030s. What would “commercializing nuclear fusion” mean at this point?

I wonder how much longer this fusion boom will continue. “As I am leaving this institute, I breathe a sigh,” Associate Professor Uramoto said in his NIFS retirement memoir. “The development of the toroidal [magnetic confinement] nuclear fusion reactor is totally blocked by three challenges: One, abysmally high cost (trillions of yen more in the future?) and a mind-boggling long time (more than 50 years); two, gigantic and complicated systems (a mega-sized system cannot be handled unless simple); and three, the heat-resistant material and radiation-proof material for the reactor walls are not available on earth.”

For the cost, the Special Committee on the ITER Project of the Japan Atomic Energy Commission bragged about ITER in its report, “International Thermonuclear Experimental Reactor (ITER) Project Forecast” (May 18, 2001): “It is difficult to correctly estimate the cost required to realize a nuclear fusion reactor, …………………………………………………

Of the challenges Uramoto pointed out, the second one, “gigantic and complicated systems (a mega-sized system cannot be handled unless simple)” and the third one, “the heat-resistant material and radiation-proof material for the reactor walls are not available on earth” remain unsolved, despite the passage of so many years.

The pot is calling the kettle black

It is meaningless to compare nuclear fusion with nuclear power generation, but some say: “Nuclear fusion is clean.” In terms of the radioactivity released when a large accident occurs, nuclear fusion technology would emit less radioactivity than a conventional nuclear plant.

However, the daily releases of radioactive materials from nuclear fusion would be greater than those from a conventional nuclear power plant. Nuclear fusion is also more likely to leak tritium and radioactive gas. It will produce four times as much energy as nuclear fission while producing seven times as many neutrons. Workers in the fusion plant would be exposed to radiation, and people in the neighborhood would also be exposed due to sky shine. Plant equipment would be strongly radiated and easily embrittled, requiring frequent replacement, producing a huge amount of highly contaminated wastes……………………………………………. more https://cnic.jp/english/?p=6549

April 8, 2023 - Posted by Christina Macpherson | Japan, technology