Word: coolant
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Dates: during 1970-1979
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...activated. That started a reactor "scram" or shutdown. Tons of water flowed into the reactor and out through the open relief valve. At the same time, malfunctioning instruments gave reactor operators misleading readings of reactor pressure, which made them believe that the core of enriched uranium was covered with coolant when it was not. The operators switched off the system on the assumption that it was no longer needed. The premature shutdown and temporary loss of coolant caused the reactor's fuel rods to overheat. They reached a temperature of around 2,500° F., which could have...
...Nuclear Regulatory Commission (NRC) said in its daily status report that in the first 15 hours of the March 28 accident, referred to as a "transient" period, large portions of the core were exposed when coolant water boiled into steam...
Technicians yesterday continued to cool the reactor core slowly as they prepared for an eventual cold shutdown. The main coolant water temperatures had fallen to 249 degrees by afternoon, a drop of one degree since Saturday...
...staff members said they discovered certain instruments in some power plants designed by Westinghouse can give conflicting and misleading readings about coolant water levels in the reactor. NRC officials have said a similar situation existed at Three Mile Island and may have contributed to the accident...
...disposing of radioactive waste from nuclear plants was far more complex than either the industry or the Government had believed. At about the same time, the NRC shut down five nuclear power plants in the East because it was not certain they had been designed so that their coolant pipes could survive an earthquake...