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 Post subject: Policy change in Japan
PostPosted: Dec 30, 2012 12:43 pm 
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The LDP won last week's elections in Japan. Shinzo Abe is the new prime minister and has promised to reverse the previous government's stance on nuclear power. The LDP is pro-nuclear and has indicated that the nuclear power plants in Japan will be started up again. More interesting is what will happen to nuclear energy research in Japan in the aftermath of Fukushima. Could it be an opportunity to investigate safer nuclear technologies, such as molten salt reactors ? The late Dr. Furukawa was a big proponent of MSR's inside and outside Japan. Furthermore, China, a strategic rival of Japan, is investing in molten salt reactor technology. Are MSRs really a better alternative than other reactor types such as LWRs, in a country which cares about earthquakes and tsunami's ?


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PostPosted: Jan 01, 2013 8:18 am 
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Interesting follow-up. From the NY Times:

http://www.nytimes.com/2012/12/31/world ... l?src=recg

Shinzo Abe endorses nuclear power and hints at reactors which will be "completely different from those at the Fukushima Daiichi nuclear power plant". What could he have in mind ?


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PostPosted: Jan 01, 2013 11:51 pm 
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It is such a waste to give up nuclear energy, which produced a third of Japan's power just because a few of older reactors were damaged due to unprecedented earthquake and tsunami in living history. Japanese are too knowledgeable for sense not to prevail in due course.
If the geological fault lines or vulnerability to earthquakes or tsunami limit the sites, They could also build floating power plants and anchor them where required. Russians have already made a start.
The Japanese have a lot of Plutonium from reprocessing in France/UK/Japan. They could set up uranium/thorium breeders using it as fuel as originally planned. They have already done a lot of R&D. After bad experience with sodium as coolant, they could shift to lead or salt instead of just giving up.


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PostPosted: Jan 02, 2013 3:26 am 
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Its just a matter of time until the pressure of 100's of billions of lost production from shut down nuclear plants forces them to restart.


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PostPosted: Jan 02, 2013 9:40 am 
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camiel wrote:
Interesting follow-up. From the NY Times:

http://www.nytimes.com/2012/12/31/world ... l?src=recg

Shinzo Abe endorses nuclear power and hints at reactors which will be "completely different from those at the Fukushima Daiichi nuclear power plant". What could he have in mind ?


The Japanese have had a major sodium fast reactor program for some time. Results from the MONJU were very poor, but he could be talking about the newer passively safe pool type or hybrid loop/pool type sodium fast reactors.

The latest BWRs offered by Japanese heavy industrial companies are also passively safe (have full decay heat shutdown cooling even in full station blackout). ABWR-II, Toshiba's EU-ABWR, GE's ESBWR and the French BWR design Kerena (formerly SWR1000) all have shutdown cooling systems that don't need electricity.

My guess that eithere these passive SFRs or passive BWRs are meant by Shinzo Abe. Probably not MSRs, the Japanese have not done much work here.


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PostPosted: Jun 22, 2017 12:42 pm 
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Japan eyes U.S. nuclear pact that renews automatically amid Trump administration vacancies


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PostPosted: Oct 07, 2017 8:05 am 
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Japan nuclear panel plans reduction in plutonium stockpile, but details remain unclear

Quote:
According to the document, Japan had about 47 tons of plutonium as of the end of 2016, down 1 ton from a year before thanks to the start of two reactors that use MOX fuel. Even so, the amount is said to be enough to make thousands of nuclear bombs.


Thorium reactors would be a much faster and more effective way for Japan to reduce its plutonium stockpile. When you consume plutonium in the presence of uranium in a nuclear reactor, you just make more plutonium.


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PostPosted: Oct 07, 2017 7:34 pm 
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Kirk Sorensen wrote:
Japan nuclear panel plans reduction in plutonium stockpile, but details remain unclear

Quote:
According to the document, Japan had about 47 tons of plutonium as of the end of 2016, down 1 ton from a year before thanks to the start of two reactors that use MOX fuel. Even so, the amount is said to be enough to make thousands of nuclear bombs.


Thorium reactors would be a much faster and more effective way for Japan to reduce its plutonium stockpile. When you consume plutonium in the presence of uranium in a nuclear reactor, you just make more plutonium.


Mr. Sorensen,
I have little doubt that the people implementing this plan also know what you know, that this will not reduce the plutonium stockpile any. They have a requirement, either self imposed or imposed by treaty, to have a non-weapon use for their plutonium stock. Without a reactor to burn plutonium they'd have to dispose of this valuable material in some other way. What would those means of disposal be? Exporting it seems most likely. Then they'd have to find someone willing to buy it, someone that won't just buy it from them to later drop it on their heads.

Perhaps they have read your papers and see this as a transition to a thorium cycle. Maybe they see this as a way to create a sustainable plutonium fuel cycle. Japan has been investigating ways to extract uranium from seawater. Being an island nation they don't have a lot of choices for domestic sourced energy. As difficult and expensive uranium from seawater might be it is something that they don't have to beg another nation to get.

As the article says the details of their plans are unclear. This may be a way to quietly work their way towards a nuclear weapons program. It's not like hiding a nuclear weapons program under the veil of civilian power generation is a new thing. Japan does have a madman lighting off nuclear weapons and large rockets in their backyard. This "rocket man" might need more persuasion than a former reality TV star turned politician can provide to change his ways. A secret nuclear weapon program is not a deterrent, but a demonstration of a working nuclear weapon would be. I see this development as a means for Japan to keep their options open.

A MOX processing plant allows them to keep their plutonium without violating any rules or treaties. It lets them experiment with plutonium chemistry which can be useful in weapons manufacture and in creating a plutonium-thorium fuel cycle. They'll get energy from this stockpile in the process, without having to rely on the kindness of other nations to trade plutonium for coal or oil.

I agree that converting this plutonium to U-233 would be a better option, but can we agree that what they are doing now is at least better than most of the other options they have? This is certainly better than walking away from nuclear power like a lot of people in Japan seem to want to happen.

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Disclaimer: I am an engineer but not a nuclear engineer, mechanical engineer, chemical engineer, or industrial engineer. My education included electrical, computer, and software engineering.


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