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TOKYO (Reuters) ? The operator of tsunami-hit nuclear power plant in Japan said on Wednesday it had found substances in a reactor which could be a result of nuclear fission, a possible setback in efforts to bring the plant to a safe, cold shutdown this year.
The Fukushima Daiichi nuclear power plant was struck by a devastating earthquake and tsunami in March and has released radiation into the atmosphere ever since.
Tokyo Electric Power said that it discovered xenon, a substance produced as a byproduct of fission from the No 2 reactor, and had poured in a mixture of water and boric acid, an agent that helps prevent nuclear reactions, as a precaution.
"It can be assumed that isolated criticality took place for a short period of time judging from the presence of xenon," Tepco spokesman Junichi Matsumoto told reporters.
Criticality is a state when controlled nuclear reactions take place and nuclear power plants harness the resulting heat to produce electricity.
The amount of detected xenon was small and the nuclear fuel in the No 2 reactor is unlikely to have melted down again, Tepco said. The fuel in the No 2 reactor, along with two other reactors, had melted down early in the crisis after the tsunami knocked out the plant's cooling system triggering the world's worst nuclear crisis since Chernobyl 25 years ago.
Analysts said there was minimal risk of further radiation.
Kazuhiko Kudo, a professor of nuclear engineering at Kyushu University, suggested two possibilities.
"Some of the lumps of fuel that melted off early in the accident may have caused the nuclear fission. I would not rule it out completely but this possibility is highly unlikely as many elements, like temperature and the amount water, have to be at a right balance for fission to occur."
The other possibility, Kudo said, was tiny radioactive elements produced by the nuclear reaction early in the crisis colliding and moving neutrons inside the reactor, in turn causing the neutrons to collide and split uranium, causing tiny nuclear fissions.
"The initiating amount in this case is so small that any nuclear fissions would not leave a significant impact," Kudo said.
Tepco said temperature and pressure at the No 2 reactor remained stable.
Through various cooling efforts the utility has succeeded in bringing down the temperatures at the three damaged reactors from levels considered dangerous and hopes to declare a cold shutdown -- when temperatures are stable below boiling point -- this year.
Tepco said in October that the amount of radiation being emitted from the complex had halved from a month earlier, in the latest sign that efforts to bring the facility under control are progressing.
(Additional reporting by Kiyoshi Takenaka; Editing by Tomasz Janowski and Nick Macfie)
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SINGAPORE (AP) ? Oil prices fell to near $92 a barrel Tuesday in Asia as the initial optimism about Europe's plan to resolve its debt crisis faded.
Benchmark crude for December delivery was down $1.07 at $92.12 a barrel at late afternoon Singapore time in electronic trading on the New York Mercantile Exchange. The contract slipped 13 cents to settle at $93.19 in New York on Monday.
Brent crude was down 29 cents at $109.27 a barrel on the ICE Futures Exchange in London.
Crude has jumped from $75 on October 4 amid expectations of a European plan to contain Greece's debt crisis.
Last week, EU policymakers agreed to lower Greece's debt level over the next decade and also asked bondholders to accept 50 percent losses on their Greek debt, sending stocks and commodities higher. But the plan lacked key details and investors are worried weak economic growth in Europe could undermine fiscal and debt targets.
"Last week's initial market response to the eurozone plan appeared outsized in relation to the limited details that accompanied the announcement and as a result, the markets are retracing much of last week's price up spike," energy consultant Ritterbusch and Associates said in a report.
Traders were also spooked by the bankruptcy of MF Global, a securities firm headed by former New Jersey Gov. Jon Corzine. Rating agencies downgraded the company last week, worried that it holds too much European debt.
In other Nymex trading, heating oil fell 2.3 cents to $3.04 per gallon and gasoline futures slid 2.2 cents to $2.58 per gallon. Natural gas gained 0.5 cent to $3.94 per 1,000 cubic feet.
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Possible campaign-finance impropriety simmers alongside a report of sexual harassment allegations dating from the 1990s. 'I have never sexually harassed anyone,' Herman Cain insisted. But he also gave new information about a settlement with one of the women.
Herman Cain should know that his presidential campaign is in trouble when one brewing scandal is stealing attention from another one.
Skip to next paragraphMost headlines are focused on the sexual harassment allegations that came to light Sunday in a report on Politico.com. Mr. Cain, leading for now in national and many statewide polls for the Republican presidential nomination, was alleged to have sexually harassed two former employees when he ran the National Restaurant Association in the 1990s. The group paid settlements to two women, Politico reported, citing multiple sources. Politico did not reveal the names of the women, in keeping with the terms off their settlements.
In public appearances Monday, Cain said he was ?falsely accused,? and called the story a ?witch hunt.? He also said he was unaware of any settlement, a point he reversed later in the day.
But perhaps just as damaging to Cain is a report in the Milwaukee Journal Sentinel, also published Sunday, which asserts that two of his top campaign aides ran a private nonprofit group that may have improperly helped get Cain?s campaign started.
One of the aides at the heart of this inquiry is Mark Block, a Wisconsinite now famous for a Cain campaign Web ad in which he smokes a cigarette. Mr. Block and the campaign?s deputy chief of staff, Linda Hansen, founded the Wisconsin-based group Prosperity USA, now at the center of questions over whether it improperly paid for some early Cain campaign expenses.
The Milwaukee Journal Sentinel obtained internal financial documents showing that the Cain campaign owed Prosperity USA $37,372, mostly for travel expenses but also for the purchase of iPads. It wasn?t clear if the money had been reimbursed; such expenditures might be a violation of federal law, the paper said.
Block told the Washington Post in an e-mail Monday that the campaign has asked ?outside counsel to investigate the Milwaukee Journal Sentinel?s suggestions and may comment, if appropriate, when that review is completed.?
In addition, Block was the subject of a Huffington Post piece published Friday that reported he was banned from running Wisconsin political campaigns for three years in the early 2000s after he was accused of illegally coordinating a state Supreme Court justice?s reelection campaign with a special-interest group that favored school vouchers.
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