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Posts Tagged ‘nuclear fuel rods’

Fukushima Reactor 1 melted down, 2 and 3 may have too

May 17, 2011 Comments off

arstechnica

Yesterday, TEPCO, the company responsible for running the Fukushima nuclear reactors, released a provisional analysis of the events that occurred in Unit 1, one of the reactors that was active when the tsunami struck. In five stark pages, the report lays out the impact of the tsunami on the facility: water levels that plunged below the bottom of the fuel, a complete meltdown of the nuclear fuel, and extensive damage to the reactor vessel.

The new analysis was enabled by the recent installation of air purifiers that let personnel reenter the reactor control room for the first time. Once inside, they were able to recalibrate some of the instruments that have been monitoring the reactor core; Read more…

Reactor Rupture Could Slow Japan Plant Stabilization

May 12, 2011 Comments off

globalsecuritynewswire

Coolant is escaping through a newly discovered opening in the Fukushima Daiichi nuclear power plant’s No. 1 reactor pressure vessel, a development that could slow efforts to prevent potential further radiation releases from the Japanese facility, Reuters reported on Thursday (see GSN, May 11).

Plant operator Tokyo Electric Power learned the container held less water than previously believed following repairs to monitoring equipment this week; the tank’s fluid quantity was roughly 16 feet short of the depth required to fully submerge atomic fuel if the material had remained in its intended position. The six-reactor site was severely damaged in the March 11 earthquake and tsunami that left more than 20,000 people dead or missing in Japan.

“There must be a large leak,” Tokyo Electric Power official Junichi Matsumoto said to reporters on Thursday. “The fuel pellets likely melted and fell, and in the process may have damaged … the pressure vessel itself and created a hole,” he said.

Ongoing water transfers have successfully curbed the escaped fuel’s temperature, though, and workers would keep pumping fluid into the system, Matsumoto said. The container’s water quantity suggests the rupture is likely several centimeters across, indicating the fuel might have made contact with the air early in the crisis, he said. The vessel’s surface heat level has Read more…

Japan’s nightmare gets even WORSE: All THREE damaged nuclear reactors now in ‘meltdown’ at tsunami-hit power station

March 15, 2011 Comments off

dailymail.co.uk

The Japanese nuclear reactor hit by the tsunami went into ‘meltdown’ today, as officials admitted that fuel rods appear to be melting inside three damaged reactors.

There is a risk that molten nuclear fuel can melt through the reactor’s safety barriers and cause a serious radiation leak.

There have already been explosions inside two over-heating reactors at the Fukushima Dai-ichi nuclear plant, and the fuel rods inside a third were partially exposed as engineers desperately fight to keep them cool after the tsunami knocked out systems.

'Meltdown': The Fukushima Daiichi nuclear plant moments after it was rocked by a second explosion today. Officials later admitted that fuel rods are 'highly likely' to be melting in three damaged reactors ‘Meltdown’: The Fukushima Daiichi nuclear plant moments after Read more…