Source: CBS News
Date: 1/31/2012
by: Betty Nguyen
From the Chicago Tribune 1/30/2012: Backup generators kick in after shutdown at Exelon's Byron plant
Map of Byron Nuclear Generating Station:
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Showing posts with label backup generators. Show all posts
Showing posts with label backup generators. Show all posts
Tuesday, January 31, 2012
Tuesday, September 13, 2011
9/13/2011 Solar flare could unleash nuclear holocaust across planet Earth, forcing hundreds of nuclear power plants into total meltdowns
Source: Natural News
Date: 9/13/2011
by: Mike Adams
(NaturalNews) Forget about the 2012 Mayan calendar, comet Elenin or the Rapture. The real threat to human civilization is far more mundane, and it's right in front of our noses. If Fukushima has taught us anything, it's that just one runaway meltdown of fissionable nuclear material can have wide-ranging and potentially devastating consequences for life on Earth. To date, Fukushima has already released 168 times the total radiation released from the Hiroshima nuclear bomb detonated in 1945, and the Fukushima catastrophe is now undeniably the worst nuclear disaster in the history of human civilization.
...
Read full article here
Date: 9/13/2011
by: Mike Adams
(NaturalNews) Forget about the 2012 Mayan calendar, comet Elenin or the Rapture. The real threat to human civilization is far more mundane, and it's right in front of our noses. If Fukushima has taught us anything, it's that just one runaway meltdown of fissionable nuclear material can have wide-ranging and potentially devastating consequences for life on Earth. To date, Fukushima has already released 168 times the total radiation released from the Hiroshima nuclear bomb detonated in 1945, and the Fukushima catastrophe is now undeniably the worst nuclear disaster in the history of human civilization.
...
Read full article here
Tuesday, August 23, 2011
8/23/2011 Virginia nuclear plant shut down by quake
Source: CNN
Date: 8/23/2011
(CNN) -- Tuesday's Virginia earthquake triggered the shutdown of a nearby nuclear power plant and spurred declarations of "unusual events" at plants as far away as Michigan, U.S. authorities reported.
Dominion Virginia Power said both reactors at its North Anna plant, less than 20 miles from the epicenter of the magnitude-5.8 quake, shut down after the first tremors. Amanda Reidelbach, an emergency management spokeswoman for Louisa County, said the plant vented steam, but there was no release of radioactive material.
David Heacock, the utility's chief nuclear officer, said the plant was operating on emergency power and the units were safely deactivated.
"The plants are designed for this kind of a seismic event," Heacock said. "There is no apparent damage to anything at the plant right now."
Heacock said the plant had four diesel generators supplying backup power and that those generators had three days of fuel. However, off-site electric power was expected to be restored later Tuesday, he said.
Dominion Virginia said reactors at its other nuclear station, the Surry plant near Newport News, were still running.
The North Anna plant is about 50 miles northwest of Richmond and about 90 miles southwest of Washington. Operators declared an alert -- the second-lowest level of emergency reporting under U.S. nuclear regulations -- after the quake struck shortly before 2 p.m., the Nuclear Regulatory Commission said.
Twelve other plants in six states issued an "unusual event" declaration, the lowest level of emergency notice, according to the NRC. They included the Shearon Harris plant in North Carolina; the Calvert Cliffs plant in Maryland; Pennsylvania's Susquehanna, Three Mile Island, Limerick and Peach Bottom plants; the Oyster Creek, Hope Creek and Salem plants in New Jersey; and the D.C. Cook and Palisades plants in Michigan.
"All these plants continue to operate while plant personnel examine their sites," the NRC said.
CNN's Emily Smith, Jeanne Meserve, Scott Bronstein and Shawn Nottingham contributed to this report.
Date: 8/23/2011
(CNN) -- Tuesday's Virginia earthquake triggered the shutdown of a nearby nuclear power plant and spurred declarations of "unusual events" at plants as far away as Michigan, U.S. authorities reported.
Dominion Virginia Power said both reactors at its North Anna plant, less than 20 miles from the epicenter of the magnitude-5.8 quake, shut down after the first tremors. Amanda Reidelbach, an emergency management spokeswoman for Louisa County, said the plant vented steam, but there was no release of radioactive material.
David Heacock, the utility's chief nuclear officer, said the plant was operating on emergency power and the units were safely deactivated.
"The plants are designed for this kind of a seismic event," Heacock said. "There is no apparent damage to anything at the plant right now."
Heacock said the plant had four diesel generators supplying backup power and that those generators had three days of fuel. However, off-site electric power was expected to be restored later Tuesday, he said.
Dominion Virginia said reactors at its other nuclear station, the Surry plant near Newport News, were still running.
The North Anna plant is about 50 miles northwest of Richmond and about 90 miles southwest of Washington. Operators declared an alert -- the second-lowest level of emergency reporting under U.S. nuclear regulations -- after the quake struck shortly before 2 p.m., the Nuclear Regulatory Commission said.
Twelve other plants in six states issued an "unusual event" declaration, the lowest level of emergency notice, according to the NRC. They included the Shearon Harris plant in North Carolina; the Calvert Cliffs plant in Maryland; Pennsylvania's Susquehanna, Three Mile Island, Limerick and Peach Bottom plants; the Oyster Creek, Hope Creek and Salem plants in New Jersey; and the D.C. Cook and Palisades plants in Michigan.
"All these plants continue to operate while plant personnel examine their sites," the NRC said.
CNN's Emily Smith, Jeanne Meserve, Scott Bronstein and Shawn Nottingham contributed to this report.
Sunday, June 26, 2011
6/26/2011 Berm fails causing temporary electricity outage at Fort Calhoun Nuclear Generating Station
Date: 6/26/2011
According to the AP one of the berms holding back flood waters at Fort Calhoun Nuclear Generating Station failed at 1:30 AM Sunday (June 26, 2011):
For further reading: another article from CNBC, or this article from Omaha World Herald.
Sources:
[1] Flood berm collapsed at Nebraska nuclear plant, AP via Action 3 News
[2] Flood berm collapses at Nebraska nuclear plant, AP via Victoria Advocate
[3] Flood berm bursts at Nebraska nuclear plant, CNN news wire
According to the AP one of the berms holding back flood waters at Fort Calhoun Nuclear Generating Station failed at 1:30 AM Sunday (June 26, 2011):
...This resulted in backup generators being temporarily used to power both the already shut down main reactor (having been shut down since April) and spent fuel cooling systems, as the main power was cut. Quoting a second AP article:
The 2,000-foot berm collapsed about 1:30 a.m. Sunday, allowing the swollen river to surround two buildings at the plant. The NRC says those buildings are designed to handle flooding up to 1014 feet above sea level. The river is at 1006.3 feet and isn't forecast to exceed 1008 feet.[1]
...
...According to CNN news wire the berm was punctured by machinery:
The berm's collapse didn't affect the reactor shutdown cooling or the spent fuel pool cooling, but the power supply was cut after water surrounded the main electrical transformers, the NRC said. Emergency generators powered the plant until an off-site power supply was connected Sunday afternoon, according to OPPD.[2]
...
...In this case there was not any lengthy electrical outage as the power was diverted immediately to working backup generators and reconnected promptly from the outside. Unfortunately, at the Fukushima Daiichi nuclear power plant once battery backup systems were exhausted, the diesel generators had been damaged and made non-functional by the tsunami. No external power was able to be brought in to the Fukushima Daiichi nuclear plant until the cores had already melted.
Some sort of machinery came in contact with the berm, puncturing it and causing the berm to deflate, said Mike Jones, a spokesman for the Omaha Public Power District (OPPD), which owns the Fort Calhoun plant.[3]
...
For further reading: another article from CNBC, or this article from Omaha World Herald.
Sources:
[1] Flood berm collapsed at Nebraska nuclear plant, AP via Action 3 News
[2] Flood berm collapses at Nebraska nuclear plant, AP via Victoria Advocate
[3] Flood berm bursts at Nebraska nuclear plant, CNN news wire
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