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http://www.nytimes.com/2003/09/08/national/08NUKE.html?pagewanted=print&position=
September 8, 2003
Safety Problem at Nuclear Plants Is Cited
By MATTHEW L. WALD
ASHINGTON, Sept. 7 — The emergency cooling systems that are meant to protect nuclear reactors from melting down in case of a ruptured water pipe could fail after a few minutes of use at most reactors, according to a nuclear watchdog group that is citing a government study to argue that the problem makes a catastrophe at one power plant in New York 100 times more likely.
The group, the Union of Concerned Scientists, and a New York environmental organization, Riverkeeper, plan to petition the Nuclear Regulatory Commission this week to ask that the two Indian Point reactors in Buchanan, N.Y., on the east bank of the Hudson River, should be shut until corrections are made. The problem, they argue, is that leaking water or steam would scour off pipe insulation, paint and other materials, forming debris that would clog the coolant pumps.
The Nuclear Regulatory Commission recognized the possibility years ago, and in September 1996 classified it as a serious problem, but does not anticipate that corrective action will be completed until early 2007. A commission official said, however, that the problem is complicated to solve and need not be fixed immediately because the accident that would require use of the safety system was unlikely in the first place.
David Lochbaum, a nuclear engineer with the Union of Concerned Scientists, contended that the emergency core cooling system "is virtually certain to fail at some plants."
"Right now you're relying on a pipe not breaking," he said.
According to Mr. Lochbaum and to data from the Nuclear Regulatory Commission, the problem involves 69 plants of a design called pressurized water reactors, in which the water that is used to carry off the useful heat, and to keep the fuel from over-heating, is kept at a pressure of about 2,200 pounds per square inch. If a pipe breaks and the pressure is released, the water would boil into steam because it is heated to more than 500 degrees. The steam could not cool the fuel, and the fuel would melt.
So the plants are equipped with an automatic emergency core cooling system. Drawing water from a tank outside the reactor dome, the system can dump thousands of gallons a minute into the reactor, making up for even a large leak.
In this design, water from a broken pipe would flow into the reactor basement. The outdoor tank typically holds 125,000 to 300,000 gallons, and when it was nearly empty, the system would start drawing water from the basement instead. The problem is that if the water picks up debris along the way, that debris could clog the screens over the pipes that lead back to the emergency pumps.
At the request of the commission, the Los Alamos National Laboratory studied the 69 plants, and found that for some, the risk of core damage was multiplied 100 times because of the debris problem. It ranked the plants but did not name them; Mr. Lochbaum's group used various detailed characteristics included in the report to determine which plant was which, and discovered that the Indian Point reactors were both in the worst five.
more...
*********************************************************************
Dave Lochbaum
Nuclear Safety Engineer
Union of Concerned Scientists
1707 H Street NW Suite 600
Washington, DC 20006-3962
(202) 223-6133 x113
(202) 223-6162 fax
From the UCS fact sheet:
Who is exposed to undue risk?
Anyone living near anyone of the following PWRs is at unnecessarily
high risk as long as NRC allows the reactors to operate seriously
impaired by the containment sump problem:
PWR Name Location
Farley 1 Dothan, AL
Farley 2 Dothan, AL
Arkansas Nuclear One 1 Russellville, AR
Arkansas Nuclear One 2 Russellville, AR
Palo Verde 1 Wintersburg, AZ
Palo Verde 2 Wintersburg, AZ
Palo Verde 3 Wintersburg, AZ
Diablo Canyon 1 Avila Beach, CA
Diablo Canyon 2 Avila Beach, CA
San Onofre 2 San Clemente, CA
San Onofre 3 San Clemente, CA
Millstone 2 Waterford, CT
Millstone 3 Waterford, CT
Crystal River 3 Red Level, FL
St. Lucie 1 Hutchinson Island, FL
St. Lucie 2 Hutchinson Island, FL
Turkey Point 3 Florida City, FL
Turkey Point 4 Florida City, FL
Vogtle 1 Waynesboro, GA
Vogtle 2 Waynesboro, GA
Braidwood 1 Braidwood, IL
Braidwood 2 Braidwood, IL
Byron 1 Rockford, IL
Byron 2 Rockford, IL
Wolf Creek Burlington, KS
Waterford 3 Taft, LA
Calvert Cliffs 1 Lusby, MD
Calvert Cliffs 2 Lusby, MD
DC Cook 1 Bridgman, MI
DC Cook 2 Bridgman, MI
Palisades South Haven, MI
Prairie Island 1 Red Wing, MN
Prairie Island 2 Red Wing, MN
Callaway Fulton, MO
McGuire 1 Cornelius, NC
McGuire 2 Cornelius, NC
Shearon Harris New Hill, NC
Fort Calhoun Fort Calhoun, NE
Seabrook Seabrook, NH
Salem 1 Salem, NJ
Salem 2 Salem, NJ
Indian Point 2 Buchanan, NY
Indian Point 3 Buchanan, NY
R. E. Ginna Ontario, NY
Beaver Valley 1 Shippingport, PA
Beaver Valley 2 Shippingport, PA
Three Mile Island 1 Londonderry Township, PA
Catawba 1 Clover, SC
Catawba 2 Clover, SC
H. B. Robinson 2 Hartsville, SC
Oconee 1 Seneca, SC
Oconee 2 Seneca, SC
Oconee 3 Seneca, SC
Virgil C. Summer Parr, SC
Sequoyah 1 Soddy-Daisy, TN
Sequoyah 2 Soddy-Daisy, TN
Comanche Peak 1 Glen Rose, TX
Comanche Peak 2 Glen Rose, TX
South Texas Project 1 Palacios, TX
South Texas Project 2 Palacios, TX
North Anna 1 Mineral , VA
North Anna 2 Mineral, VA
Surry 1 Gravel Neck, VA
Surry 2 Gravel Neck, VA
Kewaunee Carlton, WI
Point Beach 1 Two Rivers, WI
Point Beach 2 Two Rivers, WI
What can you do?
If you work at the Davis-Besse nuclear plant, pat yourself on the back
for voluntarily fixing a serious
safety problem and being the first PWR in the United States to have done so.
If you work for the NRC, put aside the license renewal applications and
power uprate amendment
requests until this PWR containment sump problem is fixed.
If you are a member of the US Congress, ask the NRC why it is putting
the financial safety of the nuclear industry ahead of public safety.
If you live near one of the 68 PWRs, tell the NRC (opa@nrc.gov) or your
US Senators and/or
Representative that you want the NRC to fix the PWR containment sump
problem THIS year.
What will UCS do?
UCS will interface with the NRC trying to get the PWR containment sump
problem fixed sooner rather than later. And we will interface with the
US Congress, the media, and people living around the unnecessarily
dangerous reactors to try to pressure the NRC to fix this problem THIS year.
Prepared by: David Lochbaum
Nuclear Safety Engineer
Union of Concerned Scientists
September 8, 2003
Safety Problem at Nuclear Plants Is Cited
By MATTHEW L. WALD
ASHINGTON, Sept. 7 — The emergency cooling systems that are meant to protect nuclear reactors from melting down in case of a ruptured water pipe could fail after a few minutes of use at most reactors, according to a nuclear watchdog group that is citing a government study to argue that the problem makes a catastrophe at one power plant in New York 100 times more likely.
The group, the Union of Concerned Scientists, and a New York environmental organization, Riverkeeper, plan to petition the Nuclear Regulatory Commission this week to ask that the two Indian Point reactors in Buchanan, N.Y., on the east bank of the Hudson River, should be shut until corrections are made. The problem, they argue, is that leaking water or steam would scour off pipe insulation, paint and other materials, forming debris that would clog the coolant pumps.
The Nuclear Regulatory Commission recognized the possibility years ago, and in September 1996 classified it as a serious problem, but does not anticipate that corrective action will be completed until early 2007. A commission official said, however, that the problem is complicated to solve and need not be fixed immediately because the accident that would require use of the safety system was unlikely in the first place.
David Lochbaum, a nuclear engineer with the Union of Concerned Scientists, contended that the emergency core cooling system "is virtually certain to fail at some plants."
"Right now you're relying on a pipe not breaking," he said.
According to Mr. Lochbaum and to data from the Nuclear Regulatory Commission, the problem involves 69 plants of a design called pressurized water reactors, in which the water that is used to carry off the useful heat, and to keep the fuel from over-heating, is kept at a pressure of about 2,200 pounds per square inch. If a pipe breaks and the pressure is released, the water would boil into steam because it is heated to more than 500 degrees. The steam could not cool the fuel, and the fuel would melt.
So the plants are equipped with an automatic emergency core cooling system. Drawing water from a tank outside the reactor dome, the system can dump thousands of gallons a minute into the reactor, making up for even a large leak.
In this design, water from a broken pipe would flow into the reactor basement. The outdoor tank typically holds 125,000 to 300,000 gallons, and when it was nearly empty, the system would start drawing water from the basement instead. The problem is that if the water picks up debris along the way, that debris could clog the screens over the pipes that lead back to the emergency pumps.
At the request of the commission, the Los Alamos National Laboratory studied the 69 plants, and found that for some, the risk of core damage was multiplied 100 times because of the debris problem. It ranked the plants but did not name them; Mr. Lochbaum's group used various detailed characteristics included in the report to determine which plant was which, and discovered that the Indian Point reactors were both in the worst five.
more...
*********************************************************************
Dave Lochbaum
Nuclear Safety Engineer
Union of Concerned Scientists
1707 H Street NW Suite 600
Washington, DC 20006-3962
(202) 223-6133 x113
(202) 223-6162 fax
From the UCS fact sheet:
Who is exposed to undue risk?
Anyone living near anyone of the following PWRs is at unnecessarily
high risk as long as NRC allows the reactors to operate seriously
impaired by the containment sump problem:
PWR Name Location
Farley 1 Dothan, AL
Farley 2 Dothan, AL
Arkansas Nuclear One 1 Russellville, AR
Arkansas Nuclear One 2 Russellville, AR
Palo Verde 1 Wintersburg, AZ
Palo Verde 2 Wintersburg, AZ
Palo Verde 3 Wintersburg, AZ
Diablo Canyon 1 Avila Beach, CA
Diablo Canyon 2 Avila Beach, CA
San Onofre 2 San Clemente, CA
San Onofre 3 San Clemente, CA
Millstone 2 Waterford, CT
Millstone 3 Waterford, CT
Crystal River 3 Red Level, FL
St. Lucie 1 Hutchinson Island, FL
St. Lucie 2 Hutchinson Island, FL
Turkey Point 3 Florida City, FL
Turkey Point 4 Florida City, FL
Vogtle 1 Waynesboro, GA
Vogtle 2 Waynesboro, GA
Braidwood 1 Braidwood, IL
Braidwood 2 Braidwood, IL
Byron 1 Rockford, IL
Byron 2 Rockford, IL
Wolf Creek Burlington, KS
Waterford 3 Taft, LA
Calvert Cliffs 1 Lusby, MD
Calvert Cliffs 2 Lusby, MD
DC Cook 1 Bridgman, MI
DC Cook 2 Bridgman, MI
Palisades South Haven, MI
Prairie Island 1 Red Wing, MN
Prairie Island 2 Red Wing, MN
Callaway Fulton, MO
McGuire 1 Cornelius, NC
McGuire 2 Cornelius, NC
Shearon Harris New Hill, NC
Fort Calhoun Fort Calhoun, NE
Seabrook Seabrook, NH
Salem 1 Salem, NJ
Salem 2 Salem, NJ
Indian Point 2 Buchanan, NY
Indian Point 3 Buchanan, NY
R. E. Ginna Ontario, NY
Beaver Valley 1 Shippingport, PA
Beaver Valley 2 Shippingport, PA
Three Mile Island 1 Londonderry Township, PA
Catawba 1 Clover, SC
Catawba 2 Clover, SC
H. B. Robinson 2 Hartsville, SC
Oconee 1 Seneca, SC
Oconee 2 Seneca, SC
Oconee 3 Seneca, SC
Virgil C. Summer Parr, SC
Sequoyah 1 Soddy-Daisy, TN
Sequoyah 2 Soddy-Daisy, TN
Comanche Peak 1 Glen Rose, TX
Comanche Peak 2 Glen Rose, TX
South Texas Project 1 Palacios, TX
South Texas Project 2 Palacios, TX
North Anna 1 Mineral , VA
North Anna 2 Mineral, VA
Surry 1 Gravel Neck, VA
Surry 2 Gravel Neck, VA
Kewaunee Carlton, WI
Point Beach 1 Two Rivers, WI
Point Beach 2 Two Rivers, WI
What can you do?
If you work at the Davis-Besse nuclear plant, pat yourself on the back
for voluntarily fixing a serious
safety problem and being the first PWR in the United States to have done so.
If you work for the NRC, put aside the license renewal applications and
power uprate amendment
requests until this PWR containment sump problem is fixed.
If you are a member of the US Congress, ask the NRC why it is putting
the financial safety of the nuclear industry ahead of public safety.
If you live near one of the 68 PWRs, tell the NRC (opa@nrc.gov) or your
US Senators and/or
Representative that you want the NRC to fix the PWR containment sump
problem THIS year.
What will UCS do?
UCS will interface with the NRC trying to get the PWR containment sump
problem fixed sooner rather than later. And we will interface with the
US Congress, the media, and people living around the unnecessarily
dangerous reactors to try to pressure the NRC to fix this problem THIS year.
Prepared by: David Lochbaum
Nuclear Safety Engineer
Union of Concerned Scientists