Top dome

Steel. The steel container s most usual form is cylindrical with a concave (or flat) bottom and a convex top dome with a circular opening finished to receive a valve with a standard 2.54-cm opening. The three pieces (body, bottom, and top) are produced separately and joined by high speed manufacturing. The size of the container is described by its diameter and height to top seam, in that order. Hence a 202 x 509 container is 54.0 mm (2 /jg in.) in diameter by 141.3 mm (5 /jg in.) high. Tables of available sizes and overflow volumes and suggested fill levels can be readily obtained from manufacturers. 

Aufsatz, m. something set on attachment fixture head, headpiece neck top dome set (of china) essay, treatise, article, paper Dyeing) topping Calico) cover print, -farbe,/. Dyeing) topping color, -farbstoff, m. topping dye. -teil, m. supplement (to a periodical). 

Ca phosphite. Its operation was exactly the same as the Type 94 Float Flare described above Navy Flare Ball was a large cardboard sphere 9 inches in diam with a dome top covering a paper-covered BkPdr Fuse and a dome bottom contg BkPdr chge in a celluloid cap. The main container carried a cluster of 12 flares attached to a large green tissue parachute. The flare cluster was bedded in a quantity of cottonseed which filled most of the lower half of the sphere. A pull wire permitted removal of the top dome and allowed access to the BkPdr fuse for ignition (Ref 1, p 247, Fig 409)... 

In the third schematic, the main valve is now fully open When the dome is vented up to approximately 70% of set pressure, the process pressure lifts the piston, and the valve can flow its rated capacity. Seventy per cent is dependent on the proportion of the unbalanced piston and varies from manufacturer to manufacturer. In this case, the top dome area of the piston is approximately 30% larger than the seat area. The dome volume to be vented is dependent on the valve size. For a 2J3 valve, this volume is only around 40-60 cm2. 

Boiler Top Dome Weld Inspection Figure 7 shows an example of how the KITSCAN has been adapted to suit a specific inspection requirement. The brief was to examine ultrasonically a large 2.6m diameter weld which formed part of a nuclear boiler structure. The inspection had to be conducted from within the boiler, to which access was gained though a 27" diameter manway. The condition inside the reactor required operators to wear contamination proof clothing and air hoods. Previous inspections had been carried out using manually operated scanners with the analysis equipment located outside of the boiler due to the restricted access conditions the entire... 

FIGURE 8. KITSCAN IN USE ON BOILER TOP DOME WELD INSPECTION. 

The water reuse tank shown in Figure 4.8 has a capacity of 76 m. The tank is 3.7 m D x 7.3 m SSH FRP, flat-bottom, dome-top with 50 cm man-ways in the top dome and the side shell. It is provided with side mounted level switches and a level transmitter. 

The primary containment is composed of reactor concrete pit with steel layer and a reactor top dome with its steel structure. They are separated by the reactor top deck, airtighted, and with independent emergency ventilation system widi decontamination function. 

Reactor core d) Steam generator Primary vessel Q) Secondary pump (D Secondary vessel (D Roof slab Intermediate heat (D Top dome exchanger Air cooler... 

The containment structure consists of a top dome and a reactor cavity. Limit pressure and temperature are summarized in the design data (see 7.11.4). 

Design Basis Fission product containment Cladding Primary vessel (reactor vessel)/IHX tube-roof slab Reactor cavity/Top dome Passive Passive Passive ... 

Severe accident Containment temperature and pressure control Reactor cavity 270°C, 0.3 MPa Top dome 150°C, 0.2 MPa Passive Passive No pressure control No pressure control... 

Tightness control Isolation valve (penetrating piping at top dome) Active ... 

Fission product containment Reactor ca ity and Top dome Reactor building (confinement) Passive Passive ... 

The containment is composed of the guard vessel installed outside the reactor vessel and the top dome over the reactor vessel. The top dome has only few penetration to maintain high leaktightness. 

Severe Accident Containment temperature and pressure control Guard vessel / Top dome / RVACS Passive ... 

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