Kyusaku Natsume writes: While the town of Onagawa, Miyagi Prefecture, was hit hard by the March 2011 tsunami, the nuclear plant it shares with the equally devastated city of Ishinomaki survived. The reason it did so is mostly down to the personal strength and tenacity of one Yanosuke Hirai, who passed away in 1986 and insisted that the plant should have been protected by a 14.8 m tall seawall. A great quote from the article : "Corporate ethics and compliance may be similar, but their cores are different, from the perspective of corporate social responsibility, we cannot say that there is no need to question a company's actions just because they are not a crime under the law."
Tepco spokesman Junichi Matsumoto said the test results suggest that either small-scale fission occurred in the melted fuel, or conditions to trigger criticality were temporarily met for some other reason. He said the same thing could also happen at reactors 1 and 3.
But because the reactor's temperature and pressure level have not changed, the fission would not have been large-scale, Matsumoto said, adding it would not thwart Tepco's schedule for achieving a cold shutdown at the reactors.
Kyusaku Natsume writes: In a potentially damning report, the japanese government panel probing the Fukushima Daiichi meltdown as learnt that the nuclear power plant Tokai No.2 avoided station blackout thanks to making a 6.1 m high seawall ended in September 2010, but TEPCO failed to do the same in Fukushima. From the article: "The tsunami that hit the Tokai plant on March 11 were 5.3 to 5.4 meters in height, exceeding the company's earlier estimate but coming in around 30 to 40 cm lower than its revised projection.
After the tsunami hit, the Tokai plant lost external power just like Fukushima No. 1 did, because the sea wall was overrun, knocking out one of its three seawater pumps.
But its reactors succeeded in achieving cold shutdown because the plant's emergency diesel generator was being cooled by the two seawater pumps that survived intact."
Kyusaku Natsume writes: TEPCO has released details of their plan to bring Unit 1 of Fukushima Daiichi under control, to improve the working conditions inside the reactor building of this unit and install a new cooling system. From the success of this operation maybe we will know how they will address the emergency in the remaining damaged nuclear reactors.