（新消息在最前）
Nuclear Energy Institue最新更新：
UPDATE AS OF 9:00 P.M. EDT TUESDAY MARCH 15
At 5:45 am, March 16, Japan Standard Time (4:45 pm EDT, March 15), a fire reignited at Tokyo Electric Power Co.'s Fukushima Daiichi 4 reactor. The fire was extinguished after about two hours, TEPCO said.
TEPCO was planning to battle the fire and provide additional water to cool used nuclear fuel with water dumped from helicopters, but abandoned the plan because a hole in the building's roof is not in close proximity of the used fuel pool.
The company may remove some panels from the top of the reactor containment buildings at reactors 5 and 6 in order to avert a possible buildup of hydrogen in the reactors. Hydrogen buildup caused explosions at reactors 1 and 3.
All of the fuel rods had been moved from reactor 4 to the spent fuel pool due to the maintenance work. About one-third of the fuel rods in reactors 5 and 6 had been removed as part of maintenance and refueling activities.
Seventy percent of the fuel rods Unit 1 and one-third in Unit 2 have been damaged, TEPCO said. The cooling water level in both units is being maintained.
Weather reports indicate that the wind at the Fukushima plant has shifted and is now blowing out to the Pacific.
An earthquake registering 6.1 on the Richter scale struck the Eastern Honshu region of Japan. Hamaoka nuclear plant, about 100 kilometers (62 miles) from the epicenter, continues to operate normally.
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WEB UPDATE AS OF 5:00 P.M. EDT TUESDAY MARCH 15]
NEI has posted a new fact sheet "Used Nuclear Fuel Storage at the Fukushima Daiichi Nuclear Power Plant." [/wrap]
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WEB UPDATE AS OF 2:15 P.M. EDT TUESDAY MARCH 15]
An explosion at Unit 2 of the Fukushima Daiichi plant earlier today has damaged the suppression chamber, which holds water and steam released from the reactor core. Personnel not directly supporting recovery efforts have been evacuated from the plant, with about 50 employees remaining, principally to restore cooling water in the reactors.
Later in the day, water level inside the Unit 2 reactor was measured at 1.7 meters below the top of the fuel rods, but it was rising as workers pumped sea water into the reactor, reports said.
Tokyo Electric Power Co. said that an oil leak in a cooling water pump at Unit 4 was the cause of a fire that burned for approximately 140 minutes. The fire was not in the spent fuel pool, as reported by several media outlets. Unit 4 was in a 105-day-long maintenance outage at the time of the earthquake and there is no fuel in the reactor.
All four reactors at the Fukushima Daini power plant are shutdown and reactor coolant systems are keeping the reactors safe.
Residents have been evacuated from the area surrounding the facility and they have been given potassium iodide tablets as a preventive measure. The ingestion of the tablets can help prevent the accumulation of radioactive iodine in the thyroid.
The U.S. Nuclear Regulatory Commission has sent 11 experts to Tokyo to provide assistance requested by the Japanese government. Two reactor experts were dispatched Saturday; others began departing Monday.
Energy Secretary Steven Chu said today that nuclear energy is safe and important to the country's energy portfolio. Americans "should have full confidence that the United States has rigorous safety regulations in place to ensure that our nuclear power is generated safely and responsibly."
In testimony before the House of Representatives, Chu said: "Safety remains at the forefront of our effort to responsibly develop America's energy resources, and we will continue to incorporate best practices and lessons learned into that process." He said the country must rely on several energy sources, including nuclear.
Sen. Jeff Bingaman, chairman of the Energy and Natural Resources Committee, said in a statement, "I think undoubtedly they'll (Nuclear Regulatory Commission) be taking a fresh look at the safety precautions and provisions that are in place, in light of whatever is learned from the Japanese. I hope that the Commission will quickly reach some conclusions about whether the safety precautions and provisions that it has insisted on are adequate for the future."
不用紧张四号机，里面没有燃料的。初号机和三号机目前还比较稳定，二号机倒是不太安分的说，不过也不用太紧张，还在灌海水。
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UPDATE AS OF 10:20 A.M. EDT TUESDAY MARCH 15]
The level of radioactivity at the Fukushima Daiichi nuclear power plant has been decreasing, according to the International Atomic Energy Agency.
At 8 p.m. EDT March 15, a dose rate of 1,190 millirem per hour was observed. Six hours later, the dose rate was 60 millirem per hour, IAEA said.
About 150 residents near the Fukushima Daiichi site have been checked for radiation and 23 have been decontaminated.
Japanese authorities have distributed potassium iodide tablets to evacuation center (see this page for more information on potassium iodide). If taken within several hours of ingesting radioactive iodine, potassium iodide can protect the thyroid gland.
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UPDATE AS OF 9:15 A.M. EDT TUESDAY MARCH 15]
Fukushima Daiichi
Units 1 and 3 at Fukushima Daiichi are stable and cooling is being maintained through seawater injection. Primary containment integrity has been maintained on both reactors.
The Japan Atomic Energy Agency (JAEA) reported an explosion in the suppression pool at Fukushima Daiichi Unit 2, at 7:14 p.m. EDT on March 14. Reactor water level was reported to be at 2.7 meters below the top of the fuel. The pressure in the suppression pool decreased from 3 atmospheres to 1 atmosphere. Radiation readings at the site increased to 96 millirem per hour.
Dose rates at Fukushima Daiichi as reported at 10:22 p.m. EDT on March 14 were:
Near Unit 3 reactor building 40 rem/hr
Near Unit 4 reactor building 10 rem/hr
At site boundary 821 millirem/hr.
Kitaibaraki (200 km south of site) 0.4 millirem/hr.
We are working on getting updated information on radiation and dose rates at and near the plant.
Station personnel not directly supporting reactor recovery efforts have been evacuated, leaving approximately 50 staff members at the site. Operators are no longer in the main control room due to high radiation levels.
Safety relief valves were able to be re-opened and seawater injection into the reactor core was restarted around 1 a.m. EDT on March 15 and is continuing.
At Unit 4 on March 14 at approximately 8:38 p.m. EDT, a fire was reported in the reactor building. It is believed to have been from a lube oil leak in a system that drives recirculation water pumps. Fire fighting efforts extinguished the fire. The roof of the reactor building was damaged.
Fukushima Daini
All four reactors at Fukushima Daini are being maintained with normal cooling using residual heat removal systems.
所以都不用紧张，200公里以南的北茨城都只有0.4millirem/hr, 那些Fallout的图都是假的，根本没有那么大的辐射。不在中心区吃碘是没有必要的，过量的摄入也会对甲状腺产生有害影响。恐慌是没有必要的。[/wrap]
官方网站：
http://nei.cachefly.net/newsande ... ors-in-that-region/ 