Grid plate

Fig. 12. OxyTech Systems MDC cell a, brine feed rotometer b, head sight glass c, cell head d, cathode assembly e, tube sheet f, grid plate g, cathode...

The HFBR core uses fully-enriched (93%) uranium oxide-aluminum cermet curved plates dad m aluminum. The core height is 0.58 m and the diameter is 0.48 m or a volume of 103.7 Itr. The U-235 weighs 9.83 kg supported by a grid plate on the vessel bottom. The coolant flow u downward. Iience. How reversal is necessary for natural circulation. It operating temperature and pressure are 60 ( and 195 psi. There are 8 main and 8 auxiliary control rod blades made of europium oxide (Lii A)o and dysprosium oxide (DyjO,), clad in stainless steel that operate in the reflector region. The scram system is the winch-clutch release type to drop the blades into the reflector region. Actuation of scram causes a setback for the auxiliary control rods which are driven upward by drive motors,... 

It is important to consider thermal effects in the design of the grid-to-shell seal. Bypassing of the grid at the seal point is a common problem caused by situations such as uneven expansion of metal and ceramic parts, a cold plenum and hot solids in contact with the grid plate at the same time, and start-up and shutdown scenarios. When the atmosphere in the bed is sufficiently benign, a sparger-type... 

Fig. 5.13 Motive power lead-acid cell with tubular positive plates in which the active material is contained in pre-formed terylene tubes, and negative pasted grid plates surrounded by microporous polyvinyl chloride separator envelopes. The case and lid are formed of heat-sealed polypropylene. (By courtesy of Chloride Industrial Batteries.)...

It should be noted that the base of the bubble is nearly 10 times greater than the diameter of the orifice. (If the grid plate is not perfectly parallel to the surface, two unparallel lines show up as seen in this figure.) It should be reiterated here that the bubbles shown in Figures 27.5-26.7 emerge from the identical orifice with a diameter of 0.25 mm. The only difference is the surface energy of the plate, more... 

The fuel elements are held in position by grid plates in the reactor core. The fuel burnup to which a reactor may be operated is expressed as megawatt-days per kilogram (MWd/kg), where MWd is the thermal output and kg is the total uranium (sum of U-235 and U-238). In light-water power reactors the core may be operated to about 35 MWd/kg (about 3.5% burnup) before fuel elements have to be replaced. In liquid metal fast breeder reactors (LMFBRs) and high temperature helium gas-cooled reactors (HTGRs), the burnups may exceed 100 MWd/kg ( 10% burnup of the heavy metal atoms). 

There are three sections in the fluidized-bed reactor. In the L-shaped hot-bottom chamber, natural gas (more than 90% methane) is burned, and the hot combustion gases are mixed before passing through the grid plate to fluidize the sand bed. The composition of the combustion product gas can be adjusted, within a limited range, with additional air to form specific component ratios. 

Between the gas-combustion chamber bottom and the reactor bed section is the high temperature grid plate. This gas-distribution plate is 1/4-inch thick, 18 inches in diameter, and made of Type 310 stainless steel. There are 584 holes in a square pattern located on 1/4-inch centers. Each hole is 0.0960 inches in diameter. 

There is no doubt that the continuous grid/plate production technology is most convenient for the manufacture of standard plates for SLI batteries and will certainly compete with the existing casting methods. However, the latter will preserve positions in the battery industry, provided the process is sufficiently flexible with regard to grid size/geometry. 

Length of the lower grid plate pin flow orifices (m) N/A... 

The fuel consists of a series of UN pellets that are total of 52 cm in length and 0.91 cm in diameter. These are capped by 5 cm of BeO to act as an axial reflector. There is a gas plenum on the top of the pin to allow for fission product gas build up. A layer of rhenium acts as a liner for the fuel pin to prevent interaction between the NblZr cladding and the UN pellets and also acts as a thermal neutron absorber in accident cases as discussed later. The NblZr end caps appear large in this Figure but their purpose is to simulate other components like the connectors that attach the fuel pin to a grid plate. 

As the fluidizing gas enters the bed through the openings in the grid plate, it usually issues as fluid jets at velocities in the range of 40-80 m/s (see Behie et al., 1976 Mori and Wen, 1976). These jets penetrate a certain distance into the bed... 

ANTI-GAS ENTRAINMENT TUBES TUBE GRID PLATES... 

A single grid plate is used to support the core and shielding subassemblies and a fully bolted construction has been adopted. The grid plate has four inlet pipes with a pair of nozzles connected to each of the two primary pumps. 

The fluidized bed dryer essentially consists of a drying chamber, plenum chamber, dust collectors, and flow control dampers. The drying chamber normally consists of three drying zones and one cooling zone. Fermented leaf is loaded on the grid plate of the drying chamber. The top of the drying... 

Fig. I. Ion sources used in studying ion-moiecule reactions by photoionization. M Monochromator R repeller A gas inlet E photoelectron collector Gi,G2, G3 grid plates.

The better heat transfer properties of helium also helped in homogenizing the circumferential temperature thus keeping grid plate shift well within limits. 

For the in-vessel components, control and safety rod drive mechanism (CSRDM), Diverse safety rod drive mechanism (DSRDM), failed fuel location module (FFLM) and primary sodium pump (PSP), saturation activity was calculated, as these components are expected to be irradiated for 20 years. A cooling time of 2 or 5 years was considered in the case of grid plate components, as these are expected to be handled only for decommissioning purposes. In the case of CSRDM, DSRDM, FFLM and PSP, a cooling time of 2 days has been considered. For the Control and Safety Rod (CSR) and Diverse Safety Rod (DSR), an irradiation time of two years and cooling time of 2 days was considered [4]. 

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