Some researchers [7, 8] have analyzed loss of primary coolant and SBO events in PWRs employing severe accident computer codes, but under the condition modeling for the pressure vessel internals except the core and the downcomer
was more simplified than that in the best-estimate computer codes.
New vibratory-feeder-based blender from Process Control Corp., Atlanta, comes with a color touchscreen control and can be equipped with an integral weighed downcomer
for extrusion control.
All reactor coolant system (RCS) components would be encapsulated within the reactor pressure vessel (RPV), including the reactor vessel Internals, primary riser, pressurizer, steam generator, reactor coolant pumps, downcomer
, and the reactor core.
The annule zone between the two tubes names as the downcomer
in which the liquid moves downward.
Two freeze-seals, one on the downcomer
pipe and one on the riser pipework, were successfully achieved and maintained, and the repair was completed in several days rather than several weeks.
In another test of DAS's effectiveness, BFN recently monitored the voltage drop on a ground cable downcomer
from the DAS array on the off-gas stack down to the ground via a voltage sensor.
This is because, Van de Sande and Smith (1973) used only plunging jet without any downcomer
but in the present system, a minimum height of gas-liquid mixture is always maintained in the downcomer
, which has a negative effect on air entrainment.
The cells incorporate the standard coal downcomer
, modified to accept the Deep Throat orifice plate, and have been divided into two sections so that the downcomers
can be removed with the restrictions of limited overhead space.
It is important to model all holdups present on a tray : the liquid and vapour in the froth (or spray or emulsion) on the tray, the liquid in the downcomer
, and the vapour above the tray.