Containment shell

Considered more reliable dian canned motor pumps (the containment shell is larger). 

In the Sundyne Canned Motor design, the entire outside of the motor is enclosed in a secondary leakage containment shell or can. Primary leakage protection is provided by corrosion resistant liners which are seal welded and 100% leak checked to assure that pumped fluid does not contact the stator windings or rotor core. There is no shaft protrusion to seal and thus no seals to leak. 

Nuclear installations are provided with a pressure explosion suppression and containment shell as an accommodation system against any sudden energy release resulting from an uncontrolled nuclear fission reaction. The internal air pressure is maintained at a level lower than the external atmosphere. 

B024 Containment shell CON SHELL c 1 A Type J thermocouple B Type K thermocouple C RTD Z other... 

Capsules These are small gelatin contains shells. Capsules are of two types -hard soft capsules. 

Inalterability by heat, moisture and contact with the walls of container (shell). Inoxibility by air or on contact with oxidizers... 

Permanent-magnet drives for pumps and stirrers are increasingly being used in high-pressure technology [22,23]. The containment shell of the magnet drive, in contrast to canned motors, must take up the full pressure-difference and must have appropriately thick walls. 

Figure 3.2 shows results of the experiment in which the initial concentration of stable I2 was 0.013 /ug m-3. The scrubber was not in operation. All results are corrected for radioactive decay of 132I. The airborne concentration rose initially as the source was mixed in the air within the containment shell. The activity on the charcoal-loaded papers was due mainly to inorganic iodine, and this declined with a half-life of about 30 min, as 132I was adsorbed on surfaces. Plaques of various materials were exposed periodically to monitor the deposition. In other experiments with more iodine carrier, loss by deposition was more rapid. 

The particulate activity trapped on the membrane filters in the sampling packs increased during the first hour (Fig. 3.2). The concentration of condensation nuclei in air in the reactor shell was 1.2 x 1010 m-3. Megaw May showed that an accommodation coefficient of 5 x 10-3 (compare Section 1.12) would explain the observed rate of increase in particulate iodine due to adsorption on the nuclei. The subsequent decline in particulate activity was due to deposition of nuclei on surfaces. Surprisingly, in this and other experiments, release of stable iodine vapour into the containment shell 4 h after the start of the experiment made little difference to the concentration of particulate 132I. Subsequently, Clough et al. (1965) showed that the amount of... 

Ciyo-EM studies of the CLPs demonstrated that the organization of VPS and VP7 is essentially identical to that seen in native cores (Hewat et al, 1992). VPS forms a thin 120 suhunit-containing shell that has T = 1 icosahedral symmetry. This shell is surrounded by a layer of 260 VP7 trimers arranged on a T= 13 icosahedral lattice. In the CLPs, the second layer composed of VP7 tended to be incomplete, "with trimers missing at the fivefold axes, a feature not observed in native cores. 

On April 26, 1986 at Chernobyl, Ukraine, a nuclear reaction went wrong and resulted in the explosion of one of the reactors in a nuclear power plant. These reactors were constructed without containment shells. The release of radioactive material covered hundreds of thousands of square kilometers. More than 3 million people in the surrounding suburbs suffered from this disaster. While 36 people died in the accident itself, the overall death toll has been estimated at 10,000. 

Trinitrotoluene belongs to the shattering class of explosives known as the brisants. The members of this class possess great force, and upon exploding, shatter the containing shell into small pieces, thus doing more damage per shell. 

Safety features at a nuclear power plant include automatic shutdown of the fission process by insertion of control rods, emergency water cooling for the cote in case of pipeline breakage, and a concrete containment shell. It is impossible for a reactor to have a nuclear explosion because the fuel enrichment in a reactor is intentionally limited to about 3% uranium-235, while almost 100% pure uranium-235 is required for a bomb. The worst accident at a PWR would be a steam explosion, which could contaminate the inside of the containment shell. 

Paper is used for flags, figures or parachutes, which are contained in a shell as display pieces, or for making various containers, shells, paper mortars etc. The type of paper is selected to suit a particular purpose. 

---