Wednesday, May 18, 2011

Asahi Newspaper in Japan Confirms Core Meltdown May Have Occurred at Fukushima

Asahi Newspaper in Japan confirms core meltdown may have occurred at Fukushima reactors #2 & #3. 


The information shows that, at the time of the problem in March, when TEPCO was saying that there was no meltdown, as of information on May 16, it may have melted down. The Japanese is ambiguous. 


In keeping with responsible reporting on this accident, the facts, once verified must be reported. So, a meltdown may have occurred, but, according to data from TEPCO on the date of the incident and soon after the incident, there was no way to verify nor deny any meltdown. The final paragraph of the news story shows how this incident unfolded. 


Asahi Shinbun (3:01AM JST 5/17/2011):
東京電力福島第一原子力発電所の2、3号機でも炉心溶融が起こり、原子炉圧力容器の底に燃料が崩れ落ちるメルトダウンが起きていたとみられること が、16日に東電が公表したデータで裏付けられた。3号機では溶けた核燃料がさらに下の格納容器内に落ちた恐れもある。専門家は事故直後から指摘してお り、細野豪志首相補佐官も16日の会見で2、3号機でのメルトダウンの可能性を示唆した。

The data disclosed by TEPCO on May 16 shows that core meltdown may have occurred in the Reactors 2 and 3 at Fukushima I Nuclear Power Plant. In the Reactor 3, the melted fuel may have dropped to the Containment Vessel. Nuclear experts have pointed to the possibility [of meltdown in the Reactors 2 and 3] and Prime Minister's Assistant Goshi Hosono hinted at the possibility in the May 16 press conference.
 東電が4月17日に示した工程表は、6~9カ月で原子炉を安定した状態で停止させるとした。1号機に続き2、3号機でもメルトダウンの可能性が出てきた ことにより、工程表の大幅な見直しは必至だ。炉心を冷やすシステムづくりに時間がかかり、高濃度の放射能汚染水の処理も膨大になるからだ。
According to TEPCO's "roadmap" on April 17, it was going to take between 6 to 9 months to shut down the reactors. The revision of the "roadmap" will be inevitable now that both Reactor 2 and Reactor 3 may have had a meltdown, as it will take more time to build a cooling system for the reactor core, and the massive amount of highly contaminated water will need to be processed.
 今回公表された地震直後のデータは原発内の中央制御室にあり、電源復旧に時間がかかったことや、記録紙に放射性物質が付着しているため整理に時間がか かっていた。公表されたのは、記録紙に打ち出されたグラフや当直長がつける運転日誌などで、大型ファイル4冊分にあたる。
The data disclosed on May 16 was the data right after the earthquake on March 11. It took TEPCO some time to retrieve the data from the central control room of the plant because of the long period of power outage and the radioactive materials on the recorded printout. The data in 4 large binders includes graphs on the printout and operation diaries kept for each shift.
 データによると、圧力容器内の圧力が、2号機は3月15日午後6時43分に、3号機は3月16日午後11時50分に、それぞれ下がった。圧力容器の密閉性が損なわれ、圧力が抜けたとみられている。
According to the data, the pressure inside the Reactor 2 RPV (Reactor Pressure Vessel) dropped at 6:43PM on March 15 (JST), and the pressure inside Reactor 3 RPV dropped at 11:50PM on March 16. The integrity of the RPVs were compromised, it is thought, and the pressure went down.
 圧力容器の底には制御棒や計測機器を外から通すための数多くの貫通部がある。メルトダウンした核燃料が圧力容器の底にたまり、その熱の影響で機器が溶け るなどした結果とみられる。3号機内の汚染水からは、原子炉内の核燃料が損傷して出るテクネチウムなどの放射性物質も確認されていることから、溶けた燃料 がさらに圧力容器から格納容器内に落ちた可能性もある。
There are many channels that go through the bottom of the RPV [16 centimeters thick] to insert control rods and measurement devices. The melted fuel went down to the bottom of the RPV, and may have melted the devices at the bottom. The contaminated water from the Reactor 3 has been found to contain the radioactive materials like technetium that are produced when the nuclear fuel gets damaged, indicating that the melted fuel may have dropped from the RPV into the Containment Vessel.
 東電は会見で「プラント全体の事象を追いかけられておらず、評価できていない」と明確な判断を示さなかった。
In the press conference, TEPCO refrained from saying anything definite. "We haven't fully grasped the situation at the plant, and we haven't been able to evaluate it."
 一方、細野氏は会見で炉心に水が入らなかった時間について「1号機は14時間9分、2号機は6時間29分、3号機は6時間43分と短くない」とし「炉心の完全な溶融(メルトダウン)の可能性をみておかないといけない」と話した。
PM Assistant Hosono said that there was no water being poured into the Reactor 1 for 14 hours and 9 minutes, Reactor 2 for 6 hours and 29 minutes, and Reactor 3 for 6 hours and 43 minutes. He said "We should be prepared for the possibility of the complete meltdown of the reactor core."
 また原子力安全委員会の班目(まだらめ)春樹委員長は16日の定例会後の会見で「3月下旬に2号機で高濃度汚染水が発見された時点で、メルトダウンして いたという認識があり、助言した。1号機と3号機も、事故の経緯を考えると同じことが起こっているとの認識を持っていた」と語った。
Haruki Madarame, chief commissioner of the Nuclear Safety Agency spoke after the regular meeting of NSA on May 16. "When the highly contaminated water was found coming from the Reactor 2 in late March, we recognized that the reactor had had a meltdown, and advised [the government]. We also knew that the Reactor 1 and 3 had the same situation, looking at how the accident unfolded."
 東電によると、機器の記録から、運転中だった1~3号機は地震によっていずれも自動停止。配管の破断などの兆候はみられないとしている。非常用ディーゼ ル発電機も正常に起動していたという。東電はこれらの記録や地震計のデータをもとに、地震直後は機器が正常に作動し、津波到達までは大きな損傷はなかった とみている。(中村浩彦、佐々木英輔)
According to TEPCO, based on the records, the Reactors 1, 2 and 3 stopped automatically after the quake, and there was no sign of any physical damage to the reactor. Emergency diesel power generators were working. TEPCO concluded that all the equipments were working normally after the quake and there was no major damage to the plant until the tsunami hit.

Thanks to EX-SKF Blogspot!

1 comment:

Anonymous said...

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