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References in periodicals archive ?
As the melt is released from RPV to the pit, the melt temperature displays a rapid increase, as shown in Figure 4, the result of which is due to the decay heat released by fission products.
A cool and low-pressure moderator provides a passive heat sink to absorb decay heat from the fuel for postulated conditions of so-called beyond design basis accidents.
The following parameters are used in calculations: values of decay heat power in IB and RB load zones, temperature dependent thermal conductivity (or effective thermal conductivity) coefficients for materials constituting the cask, ambient air temperature, heat transfer coefficients for natural convection from cask surfaces and emissivity coefficient for the cask external surface.
After the shutdown of fission reactions, decay heat is emitted from the fission products (FP's) in spent fuels for a substantial time.
The sodium coolant is shown flowing in pipes through core, SGDHR (Safety Grade Decay Heat Removal), Intermediate Heat Exchanger and Steam Generator.
By then it is cool enough that further cooling can be accomplished by natural convection--air flow driven by the decay heat of the spent fuel itself.
Decay heat removal has been long recognized as an important plant safety function and is typically mitigated with many layers of defense and redundant systems.
Their decay heat, explains Powers, raises the temperature to the point where vapor pressure is sufficient to revaporize--and, therefore, remobilize--aerosols late in the accident sequence.
Since this system is powered by the decay heat itself, it provides new ways to deal with accidents that are beyond design.
With passive naturally convected air cooling to remove decay heat, they can be made fail safe on power fail.
Depending on decay heat, truck shipment is limited to about three fuel assemblies per cask and rail casks are limited to about 14 assemblies.
The ongoing installment of the new cooling towers is aimed at securing the plant's decay heat removal in highly extreme conditions where the plant's normal seawater cooling for some reason became unavailable.