Word: steams
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Dates: during 1970-1979
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...meeting what looked at first like just another "transient," a minor glitch somewhere in the complex system like so many they had dealt with in the past. Unit 2's huge turbine, which generates 880 megawatts of electricity, had "tripped," shut down automatically, as it should when the steam that turns it has somehow been cut off. The technicians assumed that the cause would be easy to find and correct...
They could hardly have been more wrong. For the next several days, radioactive steam and gas seeped sporadically into the atmosphere from the plant. Pennsylvania Governor Richard Thornburgh advised the evacuation of all pregnant women and preschool children living within five miles of Three Mile Island, and thousands of people fled the area. As tension mounted, engineers struggled to cool the reactor's core. There was a genuine danger of a "meltdown," in which the core could drop into the water coolant at the bottom of its chamber, causing a steam explosion that could rupture the 4-ft.-thick concrete...
...Curry, Metropolitan Edison's top public relations man, explained initially that a pump had broken down in the reactor's secondary loop, which carries nonradioactive water into the steam generator, where it absorbs heat that is transferred from the nuclear chain reaction in the core by the primary loop, turns to steam and drives the turbine that generates electricity. Lacking the steam's push, the turbine automatically shut down. This, said Curry, was regarded by the engineers as a routine mechanical failure that under the plant's safety rules did not have to be immediately reported to state or federal...
...radioactive steam escaped from the reactor building? Again, said the company spokesmen, this was intentional. The control rods had automatically dropped into the core and stopped the chain reaction. But the loss of water in the primary loop allowed the reactor to get too hot. When more water was pumped into the system, the pressure rose ?and other relief valves opened. These valves vented some of the radioactive steam out of the top of the dome. When the core temperature continued to rise, employees deliberately vented more steam in brief bursts. Some of the spilled radioactive water from...
...reactor room. The third choice was to lower the water level at the floor of the reactor room and pour fresh water in from the top, thus pushing the bubble toward the bottom and away from the fuel rods. Another possibility was to restart the reactor, generating heat and steam that might break up the bubble. But this option was ruled out because of fears that the control rods might be too bent to be lowered again; if so, the chain reaction could not be controlled...