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Posts Tagged ‘Japan Nuclear’

Workers Flee Japan Nuclear Plant As Smoke Rises

AP/The Huffington Post ERIC TALMADGE and MARI YAMAGUCHI  First Posted: 03/21/11 06:20 PM Updated: 03/22/11 08:50 AM

FUKUSHIMA, Japan — Officials raced Monday to restore electricity to Japan’s leaking nuclear plant, but getting the power flowing will hardly be the end of their battle: With its mangled machinery and partly melted reactor cores, bringing the complex under control is a monstrous job that is anything but a quick-fix.

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Restoring the power to all six units at the tsunami-damaged complex is key, because it will, in theory, power up the maze of motors, valves and switches that help deliver cooling water to the overheated reactor cores and spent fuel pools that are leaking radiation.

Ideally, officials believe it should only take a day to get the Fukushima Dai-ichi nuclear under control once the cooling system is up and running. In reality, the effort to end the crisis is likely to take weeks.

Late Monday night, the deputy director general of Japan’s nuclear safety body suggested to reporters why there is so much uncertainty about when the job will be finished.

“We have experienced a very huge disaster that has caused very large damage at a nuclear power generation plant on a scale that we had not expected,” said Hidehiko Nishiyama of the Nuclear and Industrial Safety Agency.

The nuclear plant’s cooling systems were wrecked by the massive earthquake and tsunami that devastated northeastern Japan on March 11. Since then, conditions at the plant have been volatile; a plume of smoke rose from two reactor units Monday, prompting workers to evacuate.

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In this undated but recent photo released by Tokyo Electric Power Co., the Fukushima Daiichi Nuclear Power Plant reactors stand in line intact in Okumamachi in Fukushima Prefecture (state), northeastern Japan. Reactors encased in square boxes, from left,

Doomsday Scenario at Fukushima

Marvin Resnikoff- HuffPost
Senior Associate, Radioactive Waste Management Associates
Posted: March 15, 2011 11:03 AM

The slow motion events occurring at Japan’s (or GE’s) Fukushima reactor cannot be sugar-coated. It is a doomsday scenario unfolding.

Nuclear reactors are not the same as coal/oil/gas electricity plants. Unlike conventional plants, they cannot be turned off. So while brave workers were tending to Units 1, 2 and 3 reactors, attempting against all odds to keep the reactor from overheating, the fuel pool at Unit 4 was left untended; without makeup water to cool them, the fuel rods overheated. Above 1800 oF, an exothermic reaction, a fire, took place with the zirconium cladding around the uranium pellets. Zirconium burned, forming zirconium oxide and hydrogen gas, which then exploded and released radioactive cesium, a semi-volatile metal, to the atmosphere.

Near the plant, the radiation levels dangerously escalated to 400 milliseiverts/hour (or 40 rems/hour in U.S. parlance). Considering background is on the order of 1 milliseivert per YEAR, this means a yearly background dose every 9 seconds. Put plainly, workers at the Fukushima reactors are putting their lives in immediate jeopardy.

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Fukushima Explosion: Japan Nuclear Plant Rocked By Hydrogen Explosion (VIDEO)

AP/The Huffington Post First Posted: 03/14/11 01:33 AM Updated: 03/14/11 08:01 AM

SOMA, Japan – The second hydrogen explosion in three days rocked Japan’s stricken Fukushima Dai-ichi nuclear plant Monday, sending a massive column of smoke into the air and wounding 6 workers. The plant’s operator said radiation levels at the reactor were still within legal limits.

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The explosion at the plant’s Unit 3, which authorities have been frantically trying to cool following a system failure in the wake of a massive earthquake and tsunami, triggered an order for hundreds of people to stay indoors, said Chief Cabinet Secretary Yukio Edano.

Tokyo Electric Power Co. said radiation levels at Unit 3 were 10.65 microsieverts, significantly under the 500 microsieverts at which a nuclear operator must file a report to the government.

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