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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 incident follows recent coolant leaks from Russian spacecraft parked at the station. Those leaks were blamed on tiny meteoroids. The lab — named Nauku, which means science — arrived at the ...
A leak in the head gasket - often called a "blown head gasket" - can result in a leak of coolant, the combustion gasses, or both. Blue smoke from the exhaust suggests that excess oil is entering the combustion chambers (although there are other possible causes than a head gasket leak). White smoke from the exhaust suggests that coolant is ...
In a loss-of-coolant accident, either the physical loss of coolant (which is typically deionized water, an inert gas, NaK, or liquid sodium) or the loss of a method to ensure a sufficient flow rate of the coolant occurs. A loss-of-coolant accident and a loss-of-pressure-control accident are closely related in some reactors.
The second leak took place in 1977: AECL calculated that between 900 kg and 1,100 kg of coolant was deposited on the riverbed up to 1 km downstream of the outfall, and was subsequently cleaned up and monitored. The third coolant leak occurred in 1978 where the leaked coolant was cleaned up and stored on site and no coolant was released into the ...
Since tritium itself is a radioactive isotope of hydrogen, the coolant becomes contaminated with radioactive isotopes and must be kept from leaking into the environment. Additionally, this effect must be taken into account for longer cycles of nuclear reactor operation and thus requires higher initial concentration of boron in the coolant. [7]
(The primary coolant becomes briefly radioactive from its exposure to the core, and also has trace amounts of longer-lived radioactive isotopes dissolved in it, such as dissolved atoms of iron from pipes.) Because the primary coolant is at higher pressure, a ruptured heat-exchange tube would cause primary coolant to leak into the secondary loop.
The leak in the radiator occurred due to a micro-meteorite impact. The damage left a 0.8 mm diameter (0.031 in) hole into the external cooling radiator on the service module. [ 7 ]
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