Question 9 Why is a moderator required in a thermal nuclear reactor core? A To prevent overheating of the fuel rods. To absorb surplus neutrons. To shield the surrounding area from dangerous gamma radiation. To reduce the kinetic energy of thermal neutrons. BUD C
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A: Draw a schematic diagram of a core of fission reactor and explain its operational principles.
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- Which of the following describes safeguards used in nuclear power plants to protect the environment? I. Radioactive sections of the plant are cleaned every week. II. Cooling the reactor prevents an explosion and leak of radiation. III. A mixture of different forms of uranium prevents explosions. O l only Ol and II O Il and III O , II, and IIIThe actual fission reactions that release energy in a nuclear power plant are about A) one-third from uranium-235 and two-thirds from plutonium-239. B) two-thirds from uranium-235 and one-third from uranium-239. C) one-third from uranium-235 and two-thirds from uranium-239. D) two-thirds from uranium-235 and one-third from plutonium-239.33. The core of a thermal reactor consists of a sphere, 50cm in radius, that contains a homogeneous mixture of 25°U and ordinary H,O. This core is surrounded by infinite thick H2O reflector. (a) What is the reflector savings ? (b) What is the critical mass? (c) If the maximum thermal flux is 1 x 1013 neutrons/cm2-sec, at what power is the reactor operating? [ Hint: compute the M2 for core assuming the reactor is bare and of radius 50 cm. Use this value of M to estimate & and then compute new M assuming reactor is bare and of radius 50 + 6. Interate until convergence is obtained.]
- Which of the following statements about nuclear fission is true? a. No new elements can be produced in a fission reaction. b. Energy released in fission reactions is generally less than that from fusion reactions. c. In a fission reaction, two light nuclei are combined into a heavier one. d. Fission reactions can be explained on the basis of the conservation of mass-energy.Which of the following describes safeguards used in nuclear power plants to protect the environment? I. Radioactive sections of the plant are cleaned every week. II. Cooling the reactor prevents an explosion and leak of radiation. III. A mixture of different forms of uranium prevents explosions. O l only O I and II O Il and III O1,II, and IIOrdinary hydrogen is sometimes called a perfect fuel, both because of its almost unlimited supply on Earth and because, when it burns, harmless water is the product of the combustion. So why don’t we abandon fission and fusion energies, not to mention fossil-fuel energy, and just use hydrogen?