i***a
发帖数: 195 | 1 【 以下文字转载自 Military2 讨论区 】
发信人: idoba (turen), 信区: Military2
标 题: 造谣的或者辟谣的都看过来，日本核事故更新
发信站: BBS 未名空间站 (Thu Mar 17 10:41:46 2011, 美东)
参考：
1. 核辐射及日本核事故科普贴：
http://www.mitbbs.com/article_t0/Military2/149485.html
2. 最权威最准确的消息来源， 美国原子能学会
http://ansnuclearcafe.org/
3. 核电站(U235)核分裂（Nuclear fission）产物科普
http://www.mitbbs.com/article_t/Military2/150775.html
情况： 4号堆平稳
1，2，3号堆该爆的也爆了
旧燃料温度没有上升
核电站周围辐射水平在持续下降
电力要恢复了
结论：这个事情基本上控制住了，造谣或者辟谣的都可以消停了
Japan Status Updates 01:00 GMT March 17, 2011
NUCLEAR ENERGY INSTITUTE March 17, 2011, 01:00 GMT
Crews began aerial water spraying operations from helicopters to cool
reactor 3 at Fukushima Daiichi shortly before 9 p.m. EDT on Wednesday, March 16. The operation was planned for the previous day, but was postponed because of high radiation levels at the plant. News sources said temperatures at reactor 3 were rising. Each helicopter is capable of releasing 7.5 tons of water.
Spokesmen for TEPCO and Japan’s regulatory agency, Nuclear and Industry Safety Agency, on March 17 Japan time refuted reports that there was a complete loss of cooling water in the used fuel pool at Fukushima Daiichi reactor 4.
The spokesmen said the situation at reactor 4 has changed little during the day today and water remained in the fuel pool. However, both officials said that the reactor had not been inspected in recent hours.
“We can’t get inside to check, but we’ve been carefully watching the
building’s environs, and there has not been any particular problem,” said TEPCO spokesman Hajime Motojuku.
At about 7 p.m. EDT, NISA spokesman Takumi Koyamada said the temperature reading from the used fuel pool on Wednesday was 84 degrees Celsius and that no change had been reported since then. Typically, used uranium fuel rods are stored in deep water pools at temperatures of about 30 degrees Celsius.
Recent radiation levels measured at the boundary of the Fukushima Daiichi plant have been dropping steadily over the past 12 hours, Japan’s Nuclear and Industrial Safety Agency said on Wednesday night (U.S. time).
At 4 a.m. EDT on Wednesday, a radiation level of 75 millirem per hour was recorded at the plant’s main gate. At 4 p.m. EDT, the reading at one plant site gate was 34 millirem per hour. By comparison, the Nuclear Regulatory Commission’s annual radiation dose limit for the public is 100 millirem. Radiation readings are being taken every 30 minutes.
Japan’s Chief Cabinet Secretary, Yukio Edano, said earlier on Wednesday that a radiation level of 33 millirem per hour was measured about 20 kilometers from the Fukushima Daiichi plant earlier this morning. He said that level does not pose an immediate health risk.
Edano said that TEPCO has resumed efforts to spray water into the used fuel pool at the damaged reactor 4.
TEPCO also continues efforts to restore offsite power to the plant, with up to 40 workers seeking to restore electricity to essential plant systems by Thursday morning, March 17. | y*h
发帖数: 25423 | 2 看报道这些天他们都一直在用消防车之类的东西给反应堆灌水冷却，根本不靠谱，没办
法自动工作，水量也不足，意外频发。如果电力能恢复，冷却系统的水泵管道什么的修
好的话，那应该好多了。 | r******y
发帖数: 9892 | 3 The power supply won't be fixed before 19th. There's still lots of
uncertainty.
福島第一原発の電源復旧、１９日以降に 作業ずれ込む
2011年3月18日1時22分
東日本大震災で壊滅的な被害を受けた東京電力福島第一原発で、１８日に見込まれ
ていた電源の復旧が１９日以降にずれ込みそうだ。原発の運転には大量の水をポンプ
で循環させ、核燃料から出る熱を冷やす必要がある。地震で送電が止まり、非常用電
源も動かなかった。通電すれば、水の循環や給水が可能になれば危機的な状況に光が
さすだけに、東電はこの作業に望みを託す。
復旧に向けた作業は１７日早朝に始まった。東電によると、原発の敷地内で約３２
０人の作業員が参加した。
福島県内に電気を供給している東北電力の送電線を補修して電気を引き込むが、少
なくとも１０～１５時間ほどかかる。放水が始まった３、４号機より先に２号機で始
める。
送電が再開できれば、事故時などに原子炉を冷却する緊急炉心冷却システム（ＥＣ
ＣＳ）を動かすポンプを起動できる可能性もある。ＥＣＣＳが動けば、原子炉の下部
にある巨大プール、圧力抑制室の大量の水を原子炉格納容器や圧力容器に送り込める。
さらに、圧力容器や使用済み核燃料のプールにも水を循環させ、核燃料からしばら
く出続ける余熱を冷やす。プールの温度が上昇し、燃料が露出して破損するなどの事
態の拡大を防ぐ。
ただ、地震や津波、その後の火災や爆発の影響で、ポンプや変圧器などの設備が壊
れている可能性もある。設備が壊れていれば、送電しても作動しない。正常に作動す
るか逐一確かめながらの作業となる。 |
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