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The Fukushima Daiichi nuclear disaster in 2011 occurred due to a loss-of-coolant accident. The circuits that provided electrical power to the coolant pumps failed causing a loss-of-core-cooling that was critical for the removal of residual decay heat which is produced even after active reactors are shut down and nuclear fission has ceased.
The original intention (1963–1975) was to study only one or two major (large break) LOCA, since these had been the main concern of US 'rule-making' hearings in the late 1960s and early 1970s. These rules had focussed around a rather stylised large-break accident, and a set of criteria (e.g. for extent of fuel-clad oxidation) set out in ...
As Kuan states: "In a small-break LOCA with no emergency core coolant injection, core uncovery [sic] generally begins approximately an hour after the initiation of the break. If the reactor coolant pumps are not running, the upper part of the core will be exposed to a steam environment and heatup of the core will begin.
Sisters Helena and Barbara Stefaniak had their worlds turned upside down after the start of World War II. The sisters, who were living in Poland, were separated and put into work camps as teens ...
Philadelphia teacher Ellen Greenberg's death was ruled a suicide after the 27-year-old was found with 20 stab wounds; her fiancé makes his first public statement on her death.
"Thanks to him, a large number of people were able to be rescued, freed, or moved to Ukraine-controlled territory," said Oleksandr Slobozhan, who worked with 63-year-old Matvieiev.
For large, high-pressure lines, space for relief valves and maintenance considerations cause the designers to install the isolation valves near to where the lines exit containment. In the event of a leak in the high-pressure piping that carries the reactor coolant, these valves rapidly close to prevent radioactivity from escaping the containment.
The post Large Black crowds prompted spring break restrictions in Miami, civil rights advocates say appeared first on TheGrio. Miami Beach has warned non-residents to expect curfews, bag searches ...