Sheet 3
Sheet 3
Sheet 3
Engineering Faculty
Mechanical Eng. Dept.
Power Stations Sheet (3) 2nd Semester, 2015-2016
2- A nuclear reactor power plant operated continually for one year producing
500 MW. The power plant efficiency is 33 percent. The reactor contained
75 metric tons of 3 percent enriched uranium dioxide fuel.
(a) Calculate the mass of U235 consumed in kilograms.
(b) The fuel burn-up in MWd/T.
4- If 0.190 amu are converted to energy for every nucleus of U-235 that undergoes
the fission process, show that the energy released is indeed approximately 0.9
Mev. Show that the fission of 1kg of uranium-235 releases approximately a
million times more energy than the combustion of 1 kg of coal.
7- Calculate the rate of heat produced per unit volume of fuel at a position in a
reactor core in which the neutron flux is 1013 neutron/cm2.sec. The core
contains fuel 12% enriched Uranium metal. The temperature at the same
core position is 270 oC. Assume that neutrons are all
thermalized. fe 19.05gm / cm 3 M ff 235.11704 fo 583barns
8- A pressurized water reactor (PWR) operating at 138 bar has primary water
entering at 288 oC and leaving at 321 C. A 28 m3 pressurizer is normally half
full of water . During a transient, the pressure rose to 144 bar, 90 kg of spray
water entered the pressurizer becomes 60% full of water. Ignoring heat losses to
the ambient, calculate the amount of heat added by the electric heaters.
9- A PWR has inlet and exit water temperatures of 290 and 320 C, respectively . It
has a 30 m3 vapor pressurizer which is normally 60 percent full of water at a
pressure of 140 bar. A case of insurge occurred during which 0.25 m3 of water
entered the pressurizer from the primary circuit hot leg, 0.05 m3 entered through
the spray and 50 kWh was added by the electric heaters. Determine the internal
energy of the pressurizer contents before and after the event. You may ignore the
heat losses to the ambient.
**Best wishes**
Dr. Ali A. Abdul Aziz