The Fukushima Daiichi nuclear power plant 2 could not cool down and all the fuel rods were exposed, possibility of core melting (meltdown)
On March 12Explosion occurred at Unit 1 of Fukushima Daiichi Nuclear Power PlantFollowing on, today at 11:01Hydrogen explosion occurred at Fukushima Daiichi nuclear power plant Unit 3,The cooling function of Unit 2 was all lost at 13:25Although it was made clear, it became clear that there was a possibility that all the fuel rods were exposed, although cooling was not possible despite tried cooling in seawater.
Also, the possibility of core melting (= meltdown) can not be denied.
Details are as below.
Fukushima Daiichi nuclear power plant Unit 2 reactor core melt or NHK news
According to Tokyo Electric Power Company, at the Fukushima Daiichi Nuclear Power Station Unit 2, we began work to put in seawater from 6:20 pm, but after that we could not confirm that seawater is contained, and the fuel in the nuclear reactor It was revealed that there is a possibility that all the bars are exposed. "The possibility that the core melted can not be denied."
According to Tokyo Electric Power Company, we started work to inject seawater from Fukushima Daiichi nuclear power plant No.2 at 18:20, but we can not confirm that seawater is contained, all the fuel rods in the nuclear reactor It seems to have made it clear that there is a possibility of being exposed.
Moreover, it is said that "the core melted (= core melt, meltdown) is undeniable".
State of initial report.
Reactor containment. There is a possibility that the water level of the cooling water drops because the cooling is not done and all the fuel rods are exposed.
2011/03/14 20:18
I also reported the Asahi Shimbun.
Asahi.com (Asahi Shimbun): Unit 2, the whole fuel rod exposed Fukushima Daiichi Nuclear Power - Society
Regarding Fukushima Daiichi nuclear power plant No. 2, whose cooling function has been stopped, TEPCO announced that the water rod in the furnace did not stop lowering and the entire fuel rod was exposed. Although seawater injection work was started at 6:22 pm on 14th, it continued to decline. The pump used for injection was out of fuel.
2011/03/14 20: 24
Explanation on cooling method of nuclear reactor
A seawater is drawn up by a fire pump, and seawater is injected into the reactor pressure vessel.
2011/03/14 20: 27
Now water injection resumes. The water level has recovered to 30 cm.
2011/03/14 20: 36
This is the inside of Unit 2.
2011/03/14 20: 45
TEPCO told me about the situation of Unit 2. Although the control rod was stopped and stopped after the reactor stopped, the external power source disappeared due to the earthquake, and the cooling to Unit 2 was only possible with the turbine using steam.
However, as the cooling function was lost today, the water level inside the containment began to drop, reaching the top of the fuel rod around 17:17. The water level then falls below the measurement limit of the water gauge. The water level was stabilized after 20:07 by restarting the injection of sea water by the pump that was temporarily interrupted due to fuel run out.
Also, for Unit 3 that emitted white smoke, thought to be caused by hydrogen explosion, the pressure of the containment vessel is kept thereafter.
2011/03/14 20: 51
Asahi.com (Asahi Shimbun): Unit 2, the whole fuel rod temporarily exposed Water level rising due to seawater injection - Society
As the result of continuing the seawater injection work at Fukushima Daiichi nuclear power plant 2 which the whole fuel rod was exposed without stopping the water level in the nuclear reactor stopped, the water level recovered to minus 370 cm after 8 pm on 14th, It seems that some of the bars have been in the water.
Tokyo Electric Power Co. said that the possibility of core melting can not be denied. The pressure inside the reactor containment vessel has risen to the same level as the design pressure, and shortly thereafter, steam containing the radioactive substance is extracted from the container.
2011/03/14 20: 53
Unit 2 "Possibility of melting core" NHK News
According to the Nuclear and Industrial Safety Agency of Japan's Ministry of Economy, Trade and Industry, the pump to put sea water in the nuclear reactor did not work well, so it was in a state where water could not be put in, but after that, sea water began to gradually enter By saying that, "We are not in a so-called sky-free state." To prevent fuel melting at TEPCO, we are still in the process of injecting seawater continuously.
2011/03/14 21: 03
At a press conference by Chief Cabinet Secretariat Edano, it was revealed that the fuel rods may have been damaged, as radioactive materials were confirmed in the surrounding area.
2011/03/14 21: 50
According to TEPCO, the water level of the cooling water has recovered to half of the fuel rod at 21:34.
2011/03/14 22: 00
Asahi.com (Asahi Shimbun): "High possibility of core melting at all Units 1 to 3" Minano Minano - Society
Chief cabinet secretary Yukio Edano said at a press conference after 9 p.m. on the 14th that there was a high possibility that core melting occurred in all of Units 1 to 3 regarding the trouble of TEPCO Fukushima Daiichi Nuclear Power Station . "The possibility is high, three are together." "Although the earthquake itself is instantaneous, the subsequent response is progressing at the present moment to the direction toward stabilization still under a certain management.When assuming the worst case, Chernobyl (nuclear power plant I believe it will not be the same as accident). "
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