Sheehan said one of the four reactor coolant pumps appears to have stopped working.
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In a normally functioning plant, coolant water is circulated out of the reactors and chilled.
It was used as a coolant to remove heat from the electrical systems on the orbiter engines.
The reactor also lacks a back-up mechanism to stop it overheating and exploding should the helium coolant escape.
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The lack of consistency in lyrics and music may be cool but it also acts as something of a coolant.
Electricity is needed to keep the reactor cores covered with coolant and to keep safe temperatures in spent fuel pools.
One day in metal shop Packard caught his fingers in a milling machine while trying to add coolant oil from a handheld spout.
With the engine running, he can see on-screen how much fuel should be injected given X throttle pressure or Y coolant temperature.
The plan is run pipes with a coolant around the heated area.
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But the resulting buildup of salt inside has made it harder for coolant to circulate, U.S. nuclear safety officials advised in March.
But they do not have to use coolant fluids like water that must operate at high pressures in order to achieve high temperatures.
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"Iraq is a reactor that's overheating and there's little coolant available, " said Ramzy Mardini, an analyst at the Beirut-based Iraq Institute for Strategic Studies.
Christopher Cassidy and Thomas Marshburn installed the new pump after removing the old one suspected of spewing flakes of frozen ammonia coolant two days earlier.
The tsunami destroyed the diesel generators that provide power to drive the pumps that circulate the water coolant through the reactor that removes decay heat.
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This latest recall is the third one since last year, including 240 vehicles recalled in December to fix a coolant leak and more than 600 vehicles suffered a battery defect.
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Some of the suggestions include using molten lead as the coolant for the system, but the reactor would run at a temperature above 700 degrees C. when the material becomes corrosive.
Porsche (PAH3:Xetra) has announced a recall of 1, 232 2012 model-year 911 Carrera S coupes for possible interference between a coolant line and fuel line may cause the latter to become disconnected.
When the truck is stopped, the driver turns on an air handler that circulates coolant around the ice and blows cold air from the unit into the bunk area of the cab.
The ammonia coolant for the power channel, one of eight used to supply electricity to the station, would likely have run out by late Friday morning had it not been shut down, NASA said.
The ammonia coolant for the power channel, one of eight used to supply electricity to the station, is likely to run out by late Friday morning and it will be shut down, NASA said.
They did so by replacing the coolant pump.
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Neglecting coolant, brake, transmission and other fluid services.
The priority is, as it has been all along, to restore adequate coolant to the fuel ponds and the reactors themselves - while hoping that earthquake aftershocks and bad weather do not hamper operations any more.
Integral reactor systems -- including the reactor vessel itself, six steam generators, five primary coolant pumps, 12 isolation valves and more -- were stored outside for up to 18 months, exposed to highly corrosive tropical sea air and weather.
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