飓风 洪水 地震 山火攻击下的美国核电站

ESBWR

Calvert Cliffs： 铝板外墙吹落至主变区域

Irene takes two nuclear plants offline
By Ben Geman - 08/28/11 10:49 AM ET

Hurricane Irene — which was downgraded to a tropical storm Sunday — has prompted the shutdown of nuclear reactors in Maryland and New Jersey.

In Maryland, one reactor at Constellation Energy’s Calvert Cliffs plant automatically went offline late Saturday because a wind gust propelled a piece of aluminum siding from a building into the facility’s main transformer.


Constellation declared an “unusual event,” which is the lowest of four Nuclear Regulatory Commission emergency classifications. The plant’s other reactor remains online.

In New Jersey, Exelon Corp. took the one-reactor Oyster Creek Generating Station offline Saturday as a precaution ahead of expected high winds from the storm.


NRC spokesman David McIntyre told The Hill on Sunday that it could be a couple of days before the plants are brought back online.


“There are all sorts of checks that have to be made before they can come back,” he said. “I don’t want to put a timeframe on it.”


In addition to the plants that are offline, Progress Energy’s Brunswick nuclear plant in North Carolina and Dominion’s Millstone nuclear plant in Connecticut were operating at reduced power as a precaution ahead of the storm.


The NRC, in anticipation of the storm, dispatched extra inspectors to nine plants in North Carolina, Maryland, New Jersey, Connecticut, Massachusetts, New Hampshire and New York. Click here for our story about the NRC’s preparations.

ESBWR

North Anna： 继电保护设备太敏感导致断电

Automatic Disconnect From the Grid Didn't Need to Occur, Experts Say, Noting Safeguards Tailored for Western Temblors

By REBECCA SMITH

Nuclear experts likely will reassess the design of dozens of U.S. reactors in the wake of Tuesday's earthquake in Virginia that drew scrutiny when the plant temporarily lost electricity from the grid—the result of construction geared for the kind of temblor that hits Western parts of the U.S., not the East.

The finding is expected to put a spotlight on many plants east of the Rockies so they can better ride out Eastern-type quakes.

The North Anna station came through Tuesday's 5.8-magnitude temblor without apparent structural damage.

"Nothing loose, no dust, no cracks," said a relieved David Heacock, chief nuclear officer for the plant's owner, Dominion Resources Inc.

But what's now clear is that the central Virginia plant tripped out of service when there was no real need for that to happen.

Experts believe sensitive electrical equipment at North Anna responded to high-frequency ground motion—which is a hallmark of Eastern quakes, but not of Western ones—as if it were an electrical disturbance. Nine relays designed to protect expensive transformers from damage misread that cue, temporarily cutting off the plant from the electric grid, according to Dominion's Mr. Heacock.

Every earthquake produces a broad range of ground motion frequencies, expressed in "hertz" or cycles per second. But Western quakes are more noted for the lower frequencies that are especially damaging to large, rigid structures, such as buildings and bridges. Higher frequencies are more debilitating to finely tuned equipment such as electrical or electronic devices.

So it's no surprise the impact was seen at North Anna's switchyard—the place where electrical-service lines enter the plant and where electricity made by the reactors is put back on the grid.

While diesel-fueled generators kicked in to supply power, the automatic shutdown still raised concerns. What ha's been learned since the earthquake— the worst to hit Virginia in more than a century—supports a belief by seismologists that East Coast quakes have special characteristics that need to be factored into construction of nuclear plants.

Shock waves in the East travel longer distances with tight waves—"like hitting a piece of steel with a hammer," says seismologist William Hinze, professor emeritus at Purdue University in Indiana. Western earthquakes are more like "hitting a piece of rubber," he says, with shock waves more quickly smothered. That helps explain why the Virginia quake was felt as far away as Canada.

One fix looks likely. Plant operators could change the orientation of relays so they aren't so easily fooled. That's harder than it sounds since engineers need to make sure they still can sense real danger. With the analysis still in its early stage, other changes may be required. The U.S. Nuclear Regulatory Commission has a team at the site.

Tuesday's earthquake, centered about 10 miles from the North Anna plant, may have come at just the right time and in just the right place. The NRC already was in the midst of a multiyear effort to deepen its understanding of earthquake risks in the Central and Eastern U.S. and apply that knowledge to improving existing plants and  new plants even better.

In fact, North Anna's two reactors already were on a list of 27 reactors that the NRC has concluded are in greatest need of additional seismic analysis. One reason is that additional faults have been identified since those reactors were built. North Anna has two reactors and a third one has been proposed.

"There's a lot of learning to be done and we will gather every bit of information we can from this earthquake," said Mr. Hinze, who is helping the NRC with its seismic update.

Dominion is still seeking information that will help it minutely depict the profile of this week's earthquake. After the reactors "scrammed"—meaning the nuclear reaction was stopped—they still had to cool down before inspectors could get inside the reactor-containment buildings.

Once the Unit 1 reactor was shut down, the utility sent in workers, wearing gloves, who carefully removed special "scatch plates" that record earthquake data. That process took eight hours. "We had guys up all night extracting them," said Mr. Heacock.

Dominion was so eager to get the plates analyzed that it flew the first batch "to California on a private jet," said Dominion's Mr. Heacock.

The plant remained shut down on Friday. Neither reactor is likely to restart soon, especially with Hurricane Irene approaching.

Write to Rebecca Smith at rebecca.smith@wsj.com

ESBWR

Idaho实验室：山火

(Reuters) - An evacuation order was lifted on Friday for some 90 workers at a U.S. nuclear lab in Idaho as firefighters gained ground against a brush fire that has scorched 36,000 acres inside the sprawling compound.

The blaze at the Idaho National Laboratory, an 890-square-mile U.S. Energy Department nuclear complex with three active reactors in the high desert of eastern Idaho, presents "no known radiological hazard to the public at this time," lab officials said in a statement.

As the fire had grown in size and intensity, the lab on Thursday evening ordered nonessential personnel to leave a facility called the materials and fuels complex, where spent nuclear fuel and radioactive wastes are processed.

Initial reports from the facility, normally staffed by about 800 workers during the day, indicated hundreds of people were told to leave. But Steve Dunn, the lab's emergency director, told Reuters on Friday afternoon that the evacuation involved roughly 90 people.

Also on Thursday evening, workers at another installation, the Idaho Nuclear Technology and Engineering Center, where spent radioactive fuel rods are cooled in storage ponds, were told to take shelter inside that facility because of heavy smoke, a lab spokeswoman said.

The evacuation and sheltering orders were lifted Friday morning, and lab officials said some 70 firefighters backed by bulldozers and water-dropping aircraft had managed to carve containment lines around 50 percent of the fire's perimeter.

No special precautions were known to have been taken so far in surrounding populated areas, including Idaho Falls, a city of roughly 57,000 people about 15 miles east of the lab.

"DEPENDS ON THE WIND"

Dunn said winds of up to 15 miles per hour caused the fire to drive north late Friday afternoon toward a conservation area carved out for sagebrush-dependent animals in decline like sage grouse and pygmy rabbits.

"We're doing the best we can to keep the fire line on the north side but an awful lot depends on the wind," he said.

Dunn said changing weather conditions made him reluctant to say when the fire, which was caused by lightning, would be contained.

The fire has downed power lines, expected to take days to repair, but all facilities were operating on commercial power, including safety and security stems, he said.

It is the second of two blazes that have broken out in the parched sagebrush and grasslands surrounding lab facilities this week amid soaring temperatures, gusting winds and lightning strikes.

Crews on Monday contained a blaze that burned more than 100 acres on the northwest edge of the site. Fire managers said that fire was sparked by a vehicle with a blown tire dragging its metal rim along the pavement of a state highway.

The blaze, which blackened about 28,000 acres of lab property on Thursday, had grown to 36,000 acres as of Friday afternoon, Dunn said.

Some 6,000 employees and contractors work at the Idaho National Laboratory, the Energy Department's lead facility for nuclear reactor technology.

The installation last year grappled with the largest fire in its history, a conflagration that charred 109,000 acres. That fire brought down power lines at the Materials and Fuels Complex, causing officials to rely on backup generators.

Two large-scale fires at the facility within one year sparked alarm among activists with an Idaho-based nuclear watchdog group.

"These fires underscore how the nuclear industry and practices at Department of Energy sites pose threats because of unexpected events like floods, fires, earthquakes or other natural disasters," said Liz Woodruff, executive director of the Snake River Alliance.

Fires have charred tens of thousands of acres across Idaho and the Northern Rockies in recent days, including parts of Montana, Yellowstone National Park and northwestern Wyoming.

胆小如鼠

由于出现了福岛事故，核电站有任何风吹草动，都会牵动人们敏感神经。应该引起留意，但现在整个社会有点敏感“过了”。希看核电还能往前迈进，哪怕爬着也得认。谁让日本核能那么没有出息，希看我们别学东电福岛“看板”原理

xyh8721

楼主很敏感！

谢谢分享！

核电的冬天来了，不管你承认不承认，这是不以人的意志为转移的！只不过是持续范围的大小、时间是非暂时还不得而知！


借用“ESBWR签名”：

核电

福岛事件爆发出来，很值得我们思考，促使我们很冷静地考虑壹下过往，也考虑壹下未来。

ESBWR

洛斯阿拉莫斯实验室周边的山火刚刚扑灭，爱达荷又火了-
火烧新野，博看坡，赤壁，火烧八百里连营，核也怕火

The Las Conchas Fire was a 2011 wildfire in New Mexico, USA. The fire started in Santa Fe National Forest and burned more than 150,000 acres, threatening Los Alamos National Laboratory and the town of Los Alamos. After five days of burning, it became the largest wildfire in New Mexico state history.

The fire started on June 26, 2011, at approximately 1:00 pm Mountain Daylight Time when a tree fell on a power line. On the first day, the fire burned 43,000 acres, driven by strong and unpredictable winds.  By the evening of the first day of the fire, no part was contained, according to local fire officials, and the county was put under voluntary evacuation. The fire burned over 61,000 acres by the end of the day on June 27, pushed north by winds into the Pajarito Mountain Ski Area. The fire also burned south, threatening the town of Cochiti, New Mexico.On June 28, this estimate was increased to nearly 61,000 acres.On June 29, it was reported that the fire was 3 percent contained, 12 miles southwest of Los Alamos, and had burned nearly 70,000 acres (109 sq mi). By then the fire had pushed farther north into the land owned and held sacred by Santa Clara Pueblo. By June 30, the burned area had increased to over 103,000 acres (161 sq mi),  it the largest fire in New Mexico history (the second largest is the 2003 Dry Lakes Fire, which burned over 94,000 acres). Mandatory evacuation orders were issued for Los Alamos as of June 27, and Los Alamos National Laboratory was closed to all non-essential personnel. The evacuation order was lifted on July 3, at which time Los Alamos residents were allowed to return to their homes. The Los Alamos National Laboratory re-opened on July 6. As of July 14, 2011, the fire was 57% contained.

16,000 acres of Santa Clara Pueblo burned in the fire, much of it in the pueblo's watershed. 45% of the watershed was burned, leading to fears of flooding. The pueblo is currently preparing for floods. Currently, much of the burned area is still at risk for potentially dangerous flash floods.

On June 27, the fire reached Los Alamos National Laboratory. Only a one acre spot fire burned on lab property before firefighters extinguished it. That was the only time the fire burned on lab property. Authorities reported that the fire did not threaten essential buildings. The fire was moving away from the plutonium facilities and the lab property.

The fire was 100% contained on August 3 and efforts are now underway for recovery of the burned areas.

胆小如鼠

实在俄罗斯的大火也在核设施四周烧过，这些给核产业人一个警示如何应对这种题目，提供了一个真实的案例，世界上没有万无一失的事，通过我们思考，促使我们很冷静地考虑壹下过往，也考虑壹下未来。要想没有风险就学德国，但德国又没有全部把核电关掉，决心那么大，应该通通关掉。政治就是给别人听的和给别人看的，德国也没有真的做到无核。

popochong

引用: 作者: xyh8721

查看帖子

  楼主很敏感！

谢谢分享！

核电的冬天来了，不管你承认不承认，这是不以人的意志为转移的！只不过是持续范围的大小、时间是非暂时还不得而知！


借用“ESBWR签名”：

核电

福岛事件爆发出来，很值得我们思考，促使我们很冷静地考虑壹下过往，也考虑壹下未来。

         
这种口气充分标明ESBWR同道是有政治高度的领导级人物;十八大您老上台了,拉兄弟一把.

ESBWR

引用: 作者: popochong

查看帖子

  这种口气充分标明ESBWR同道是有政治高度的领导级人物;十八大您老上台了,拉兄弟一把.          兄弟没有参加派对，当然也就没有爬梯好攀登

哎

世界是我们的，也是你们的，是苹苹的，也是镪镪的，是但回根结底是那帮孙子的

ESBWR

接着谈正事 - 预防恐怖袭击-核电站变核电堡， 关键要防内鬼

http://www.cleveland.com/business/in...firstener.html

As the 10th anniversary of the 9/11 terrorist attacks on the Pentagon and the Twin Towers approaches, it is clear to federal authorities that nuclear power plants are high on the target list.

Less than three weeks ago, the Department of Homeland Security warned electric utility companies that terrorists were likely targeting their reactors -- and using power plant workers to gather intelligence.

"Violent extremists have, in fact, obtained insider positions," the agency warned in a note to power plant operators that a spokesman later tried to downplay as "routine."

The alert came after federal intelligence analysts examining documents collected from Osama bin Laden's compound learned that al Qaeda hoped to launch a massive attack to mark the anniversary.