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Update on Japan's Nuclear Power Crisis | Union of Concerned Scientists

March 13, 2011, 3:30 p.m.--The nuclear crisis in Japan took a turn for the worse as serious problems developed at a second reactor at the Fukushima Dai-Ichi nuclear facility. Earlier concerns were focused on reactor Unit 1, but now the situation at Unit 3 is becoming serious.

Officials from Tokyo Electric reported that after multiple cooling system failures, the water level in the Unit 3 reactor vessel dropped 3 meters (nearly 10 feet), uncovering approximately 90 percent of each of the fuel rods in the core.

Authorities were able to inject cooling water with a fire pump after reducing the containment pressure by a controlled venting of radioactive gas. As with Unit 1, they began pumping seawater into Unit 3. Seawater is highly corrosive and probably precludes any future use of the reactor, even if a crisis is averted.

However, Tokyo Electric recently reported that the water level in the Unit 3 reactor still remains more than 2 meters (6 feet) below the top of the fuel and company officials believe that water may be leaking from the reactor vessel. When the fuel is uncovered by water, it overheats and suffers damage. It is likely that the fuel has experienced significant damage at this point, and Japanese authorities have said they are proceeding on this assumption.



Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sun Mar 13th, 2011 at 07:23:19 PM EST

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