1号堆（Unit 1）建筑物爆炸，是专家们为避免反应堆失控而采取的孤注一掷的行动（desperate effort）：释放高压气体，冒着高压气体中的氢气与空气发生爆炸反应的危险。也就是说，爆炸是专家们预料到了的。经过注入海水，现在1号堆的状况已经恢复正常。
2号堆（Unit 2）未受影响。
为控制3号堆（Unit 3）的状况，专家们释放了该反应堆的一些带有轻微放射性的气体（slightly radioactive air）。据推测，该反应堆有可能发生了partial meltdown。现正在做灌注海水、降温降压处理。
BTW，由于这里搞核反应堆的网友不多，那个老燕王（即钱包）一直牛皮烘烘地在充专家。但他分析的爆炸的原因显然是瞎扯，而他嘲笑灌海水处理的说法更是反应了这个人的狂妄无知。
下面我copy一个钱包的帖子。再底下是美联社的最新报道。
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好消息？你不懂英文？看来完蛋了。
来源: 老燕王 于 2011-03-12 11:11:19 [档案] [博客] 旧帖] [转至博客] [给我悄悄话] 本文已被阅读：74次
这篇是NYT文章的翻译。
老夫刚才发过了。
老夫几个帖子已经说了 - 高估了鬼子们。1971年建的 第一代反应堆。早该淘汰了。
现在是个祸害。祸害米国。
看来基本上是坏了。看看你懂得的中文吧：
“在一号机组附近，检测到泄漏放射物质铯，反应堆的炉芯很可能正在融化，电力公司向压力容器注入海水冷却。”
老夫解读一哈：
一旦发生 “meltdown”就基本是一条道了 - 爆炸 - 除非自己定向爆破。现在那里根本是混乱。
注入海水是无用的 - 因为 valve jammed - 内压太高 - 高到把发电的蒸汽轮机都炸了！
你还想注水？
老夫哈哈大笑，又笑不出来 - 反应堆里从来没有注入“海水”一说。不是翻译笨蛋，
就是日本完了 - 胡来了！
stay covered!
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For battered Japan, a new threat: nuclear meltdown
By ERIC TALMADGE and YURI KAGEYAMA, Associated Press Eric Talmadge And Yuri Kageyama, Associated Press
IWAKI, Japan – A partial meltdown was likely under way at a second nuclear reactor, a top Japanese official said Sunday, as operators frantically tried to prevent a similar threat from a nearby unit at the same facility following a catastrophic earthquake and tsunami that may have killed 1,000 people.
Some 170,000 people have been ordered to evacuate the area covering a radius of 12 miles (20 kilometers) around the plant in Fukushima near Iwaki. A meltdown refers to a very serious collapse of a power plant's systems and its ability to manage temperatures. A complete meltdown would release uranium and dangerous byproducts into the environment that can pose serious health risks.
Chief Cabinet Secretary Yukio Edano told reporters that a partial meltdown in Unit 3 of the Fukushima Dai-ichi power plant is "highly possible."
"Because it's inside the reactor, we cannot directly check it but we are taking measures on the assumption of the possible partial meltdown," he said.
Japan dealt with the nuclear threat as it struggled to determine the scope of the twin disasters Friday, when an 8.9-magnitude earthquake, the most powerful in its recorded history, was followed by a tsunami that ravaged its northeastern coast with breathtaking speed and power.
The official count of the dead was 763, but the government said the figure could far exceed 1,000. Media reports said some 10,000 people were missing or unaccounted for.
Unit 3 is one of the three working reactors at the Fukushima plant that were damaged, losing the cooling functions necessary to keep the fuel rods working properly. The other unit in trouble is called Unit 1. The facility's Unit 2 has not been affected.
On Saturday, an explosion destroyed the walls of Unit 1 as operators desperately tried to prevent it from overheating and melting down.
Edano said cooling operation at Unit 1 was going smoothly after sea water was pumped in. He expressed hope that it would keep the plant under control.
Operators released slightly radioactive air from Unit 3 Sunday, while injecting water into it as an effort to reduce pressure and temperature to save the reactor from a possible meltdown, Edano said.
He said radiation levels briefly rose above legal limits, but that it has since declined significantly. Also, fuel rods were exposed briefly, he said, indicating that coolant water didn't cover the rods for some time. That would contribute further to raising the temperature in the reactor vessel.
Meanwhile, the government doubled the number of troops pressed into rescue and recovery operations to about 100,000 from 51,000.
Teams searched for the missing along hundreds of miles (kilometers) of the Japanese coast, and thousands of hungry survivors huddled in darkened emergency centers that were cut off from rescuers and aid. At least a million households had gone without water since the quake struck. Large areas of the countryside were surrounded by water and unreachable. Some 2.5 million households were without electricity.
Powerful aftershocks continued to rock the country, including one Sunday with a magnitude of 6.2 that originated in the sea, about 111 miles (179 kilometers) east of Tokyo. It swayed buildings in the capital, but there were no reports of injuries or damage.
