HW 5 - NUCL 200: Introduction to Nuclear Engineering Spring...

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Unformatted text preview: NUCL 200: Introduction to Nuclear Engineering Spring 2008 Homework Nuclear Engineering Purdue University, School of 5 Due Date:NUCL 200: Introduction to Nuclear Engineering of Wednesday, March 26, 2008 at the beginning the class. No late Spring Semester 2009 this time. homework accepted Homework 5 Due Wednesday, March 25, 2009 H5-01 the requirement the requirement for neutron moderation reaction 1. (10 pts) Explain (10 pts) Explain for neutron moderation to achieve chainto achievein a reactor fueled chain with natural uranium. reaction in a reactor fueled with natural uranium. 2. (15 pts) Fill in the table of themoderators in the following reactors. coolants, and moderators in the coolants, and form given below with suitable fuels, following reactors. Reactors Pressurizerad Water Reactor Boiling Water Reactor Gas Cooled Thermal Reactor Liquid Metal Fast Breeder Reactor Fuels Coolants Moderators H5-02 (15 pts) Fill in the table of the form given below with suitable fuels, 3. (10 pts) Which materials are suitable for (a) neutron H5-03 (10 pts) Which materials are suitable for (b) gamma ray shielding, up to high energies (a) neutron (c) very high energygamma ray shielding,by accelerators or fusion reactions. neutrons produced up to high energies (b) 4. (10 pts) Calculate the thickness of concrete required to attenuate a beam of monoenergetic -rays at 2 tions. MeV to 10% of the incident intensity. H5-04 (10 pts) Calculate the thickness of concrete required to attenuate a beam of monoenergetic -rays at MeV to 10% finite incident 5. (5 pts) What is the difference between an infinite2reactor and a of the reactor? intensity. f 6. (10 pts) The solution ofWhat is the difference betweenyields k = DB 2 +a . Describe in words the H5-05 (5 pts) one-group reactor equation an infinite reactor and a finite (c) very high energy neutrons produced by accelerators or fusion reac- reactor? significance of each term for the neutron economy in a nuclear reactor. DB +a 7. (20 pts) Using the result for words the significanceone-group critical equation, calculate the critical size and Describe in k obtained from the of each term for the neutron econmass of (a) sphere ofin a nuclear reactor. (b) cube of pure U-235 metal. The density of uranium is omy pure U-235 metal, = 18.75 g/cm3. For U-235, assume f = 1.4b, a = 1.65b, and tr = 6.8b . Compare the critical H6-07 (20 pts) Using the result for k obtained from the one-group critical mass in spherical and cubic geometries. critical size and mass of (a) sphere of pure Neglect the extrapolation distance in this problem. equation, calculate the 2 H6-06 (10 pts) The solution of one-group reactor equation yields k = f . 8. (10 pts) Explain the positive void reactivity effect that contributed to the Chernobyl accident. 9. (10 pts) Name the four enrichment methods and the four types of radioactive waste introduced in class. L&B: Introduction to Nuclear Engineering by John R. Lamarsh and Anthony J. Baratta. ...
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