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A boiling-water-type nuclear fission reactor has shut down, the backup pumps have failed and emergency cooling water must be pumped between fuel-rod assemblies in the reactor core at an average velocity of 0.5 m/s. Cold sea water with a density of 1026 kg/m3 will enter the reactor vessel and exit near-boiling at a density of 984 kg/m3. There are 400 fuel-rod assemblies of square cross-section 0.1 m x 0.1 m. The reactor vessel has a 3 m internal diameter.
The friction factor for flow between the fuel-rod assemblies is known to be 0.025 and a Darcy- Weisbach equation based on the gap D2 between the assemblies is known to apply. The cooling-water entry to the bottom of the reactor vessel is rounded with negligible head loss. The exit is to the atmosphere and also has negligible head loss. The reactor is 100 m from the sea, the bottom of the fuel-rod assemblies where the cooling water enters is 6 m above sea level and the top where the water exits is 10 m above sea level. Steel piping 0.5 m in diameter is available on site. Calculate:a) the head the pump must supply; b)the mechanical power the pump must deliver.
Questions set on Entropy, Exergy, Cycles, Otto Cycle, Rankine Cycle. In a coal fired thermal power station, indicate where the exergy contained in the coal is destroyed. For each exergy destruction mechanism, explain whether there is a small..
Important information about Overall Heat Transfer Coefficient A copper sphere of internal diameter 2 m and wall thickness 40 mm is insulated with 75 mm of expanded polystyrene
Calculate the volume of water that is available for power generation at the extremes of spring and nap tides? If during the time the turbines are running, the level of the water in the bay is 2m higher that that in the sea, what is the potential ene..
The slotted wheel rolls to the right without slipping,
Design the number of teeth and depth of teeth need be chosen. Considerations include the turn angle for each stroke, the bearing stress on the teeth and pins and shear stress on the teeth.
Estimate the time necessary to achieve the same concentration at a 5.3-mm position for an identical steel and at the same carburizing temperature.
What are stress concentrations, what causes them, and why should engineers be concerned about them?
The explanation provided below, provide the solution to the problem in simple and easy to understand steps. A turbofan engine on a test stand in the maintenance shop is being run at a continuous setting of 22,700 lbs of thrust. The TSFC is 0.5 lbs/..
rocket boosts the speed of a spacecraft from 7500 m/s to 10 500 m/s with a thrust of 890 kN. Calculate the rocket power.
Determine the natural frequencies of the system. For the baseline system I get natural frequencies at the following engine speeds: 435, 2026, 2818, 5225, 7093, 10245, and 12153 rpm.
Discuss the factors beyond crystal structure, quenching and temperature that affect he results of a specimen in a Charpy V notch impact testing.
compare it with efficiency of an otto cycle operating with the same maximum pressure?
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