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A Wall Street Journal report -after interviews with former TEPCO engineers and executives- throws more light on the failure of power and cooling at certain reactors in Fukushima Daiichi that led to the nuclear meltdown. The difference not grasped at the time turned out to be the critical difference between the reactors where electricity to cool the reactors worked and where the the electricity failed. Of the 10 nuclear reactors at Fukushima, only the 4 with the earlier Mark 1 design failed. These reactors were the earliest reactors installed by G.E. beginning in the 1970's. The Mark 1 reactors were serviced by an American engineering firm called Ebasco. Ebasco designed the reactor buildings really small so that they would be compact and economical. Because of the small size of the reactor buildings the generators providing the electricity supplies to the Mark 1 reactors could not be installed inside the reactor buildings made of fortified concrete and were installed in buildings outside lacking similiar protection. These outhoused generator buildings could not withstand the tsunami, resulting in the loss of power and cooling for these reactors, and leading eventually to the meltdown. The reactors with the Mark II and later designs were installed along with the generators in the same fortified concrete buildings, and these survived the tsunami without disruption in power supplies and cooling. This critical difference was noted by older TEPCO executives who were intervewed, but nothing was done about this because of the added cost of making the major modifications that would be needed. The regulatory system also failed to catch the problems with the original blueprints and design for housing the reactors and generators for cooling reactors. In 2001 the original 30 year operating permit for the Fukushima Daiichi nuclear reactor was renewed, and again in 2011 for another ten year period. Japan's Nuclear and Industrial Safety Agency is part of the industry ministry, and not kept separate and independent from the nuclear industry, a structural flaw. The ministry considered its job to be promoting nuclear power, and increasing nuclear power from 30% in 2010 to 50% of Japan's electricity output. One inspection official says fundamental design and construction of the reactors from a 30-40 year old design were never looked at in safety reviews by regulators approving the extensions. He even goes to the point of saying that the reviews focussed on things like pipes and fittings, missing entirely the safety of the outhouse buildings housing the generators. One of the top TEPCO engineers says this difference stood out like a sore thumb when did a walk through during inspections. He failed to get the support from fellow engineers and Tepco executives for changes that would add to the cost....

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Data collected by the Aerial Measuring System from American flights over the Fukushima nuclear plant show that radioactive contamination has not spread beyond a 19 mile range from the plant. The system uses a plane and a helicopter flying over the site with equipment taking measurements in the immediate vicinity of the plant.

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The story of how prime minister Naoto Kan's distrust of TEPCO, the electric power company operating the nuclear power plant at Fukushima, and of the bureaucrats in the government, played out in the first days of the nuclear crisis in 2011. Kan bypassed the crisis management system set up for just such a situation because of a deep mistrust of the collusion between industry and bureaucrats. Instead he relied on a close group of advisors, who felt that the company was not sharing all the information but could do little about it. This led to lack of direction in the crisis from the highest levels of government, including a lack of response to U.S. offers of support and assistance with nuclear experts and technology.

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The Nuclear Safety Commission of Japan, one of two safety regulators in Japan, met in October 2010. At that meeting a presentation by Takanori Tanaka, head of the government supported Nuclear Power Engineering Center, advocated new technologies that would reduce risk in the event of earthquakes and tsunamis. The presentation focussed on new plants and did not go into retrofitting old plants with new backup solutions for cooling in the event of electrical failure. A recent article by Hitachi researchers brought up the idea of isolation condensers which could provide temporary power supplies in the event of electrical failure. One such device was on No. 1 reactor at Fukushima (built in 1971), and worked after the quake but later failed. The views of nuclear engineers at Hitachi discussed here show that cost remains a constraint in the design of nuclear reactor cooling systems, and redundancy with several layers of diverse backup systems for cooling are not being pushed by companies building the reactors. See the group articles for G.E.'s Mark 1 system which show cost and easier to build were factors behind the smaller containment systems favored for that design. Fukushima plant uses the Mark 1 reactors. Without independent safety regulation that does not rely on the companies for analysis and solutions, regulation risks becoming too dependent on companies for coming up with the strong safety precautions that are absolutely essential. These safety precautions can succumb to cost pressures....

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Tepco will take a loss of 1.247 trillion yen or $15.28 billion for the fiscal year ending in March 2011. President Shimizu of Tepco resigned. He will be replaced by Toshio Nishizawa, a joint managing director who worked for 36 years at Tepco.

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The smaller containment design of the Mark 1 Nuclear Reactor used at the Fukushima Daiichi nuclear plant in Japan makes it more prone to explosion and rupture from a buildup of hydrogen, according to some experts in the U.S. Nuclear Safety Program at the Union for Concerned Scientists. This design is smaller and cheaper to build but is less robust than other designs. In the U.S. there are 23 Mark 1 reactors at 16 locations, including the Oyster Creek plant in New Jersey, Dresden plant near Chicago, and Monticello plant near Minneapolis. Worldwide there are 32 such reactors in operation. The design was first developed in the 1960's by General Electric. Since then various modifications have been developed including venting systems to help reduce pressure in overheating situations.

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The defeat of the anti-nuclear candidate Hosokawa supported by former prime ministers Koizumi and Kan in the Tokyo governor's election of 2014. There was low voter turnout due to bad weather and voters showed interest in local issues about elder care and the plans for the Olympics.

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Japan's prime minister Naoto Kan said after a loss in the Upper House parliamentary election, that he had not explained his plan to increase the consumption tax well enough to voters. He sees this as a big reason for the defeat in the upper house election. A small party called Your Party increased its seats from one to eleven seats. This party is popular for advocating small government.

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Norihiro Kato, a professor at Waseda University, describes the change of heart of former prime minister and LDP leader, Junichiro Koizumi, after visitng a nuclear waste facility in Finland. Koizumi who supported nuclear power for Japan has now come out in opposition to dependence on nuclear power. Kato presents the idea of a post-growth phase for Japan in which nuclear power is phased out, as is being done in Germany. The idea being that Japan does not strive for a return of an earlier period of growth but looks to creating a new future that is different from the past.

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TEPCO is releasing three million gallons of low-level radioactive water into the Pacific Ocean. (April 4, 2011) This is being done to prevent the release of the more toxic water collecting around the nuclear reactors at the Fukushima nuclear plant. This will have a serious impact on the local fishing industry.

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By June 10, 2010, the Democratic Party of Japan has recovered in poll ratings with 60% ratings for the new premier Naoto Kan and the DPJ. Ratings for Mr Hatoyama had dropped to 20% by the time he resigned. Hatoyama resigned June 2, 2010.