Nuclear Energy Revision Sheet
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1 Nuclear Energy Revision Sheet
2 Question I Identify the NPP parts by writing the number of the correct power plant part in the blank. Select your answers from the list provided below. 1 Reactor 2 Steam generator 3 Primary water loop 6 Secondary 7 Cooling 8 Transmission water loop water lines 1 Condenser 1 Pressurizer 1 Containment building 4 Control rods 9 Nuclear fuel 5 Turbine generator 10 Cooling tower
3 Question II 1) Fill in the table below with the required information: Nuclear Reactor Fuel used Moderator Coolant Boiling water reactors (BWR) Enriched UO2 Water Water Pressurized water reactors (PWR) Enriched UO2 Water Water Pressurized heavy water reactors (PHWR)-CANDU Natural UO2 Heavy water Light or heavy water Advanced power reactors (APR1400). Enriched U-235 Water Water Gas-cooled reactor (GCR) Natural U/ Enriched UO2 Graphite CO2 or Helium
4 2) What are the three grades of enriched Uranium and where they are used? 1. Slightly enriched uranium: has a U-235 concentration of 0.9% to 2% Usage: is used in some heavy water reactors. 2. Low enriched uranium: has a lower than 20% concentration of U-235 Usage: For use in commercial light water reactors 3. Highly enriched uranium: has a greater than 20% concentration of U Usage: Weapon grade uranium 3) Match the nuclear reactor or the power plant type in column (A) with the correct figure in column (B). Write your answer in the answer box provided Column A Column B B C A E G H D F No Column (A) Letter Column ( B ) 1 A Boiling water reactors (BWR)
5 2 B Pressurized water reactors (PWR) 3 C Pressurized heavy water reactors (PHWR)-CANDU. 4 D Advanced power reactors (APR1400). 5 E Gas-cooled reactor (GCR) 6 F Advanced Gas-cooled Reactor (AGR)
6 7 G Fast breeder reactor (FBR) 8 H Steam power plant Question III The figure shown below for the pressurized water reactor, name the indicated parts. Select your answers from the list provided below. Condenser Primary loop Secondary loop Tertiary loop Steam Generator Reactor coolant pump Reactor Pressure Vessel Condenser coolant pump Turbine Electricity Generator
7 Fill in the indicated parts. Write your answers in the table below. Number Name (select from the list) 1 Reactor Pressure Vessel 2 Steam Generator 3 Primary loop 4 Turbine 5 Electricity Generator 6 Tertiary loop 7 Condenser coolant pump 8 Condenser 9 Primary loop 10 Reactor coolant pump
8 Question IV 1) Nuclear reactors can be classified according to their types, moderators and use. Classify the nuclear reactors according to their usage and give examples for each one as specified below. Nuclear reactor usage Electricity production Examples I. Boiling water nuclear reactor. II. Pressurized water nuclear reactor. Propulsion I. Nuclear marine propulsion. II. Various proposed forms of rocket propulsion. Heat production reactors Any two of the following: I. Desalination plants. II. Heat for domestic use and industrial heating. III. Hydrogen production for use of hydrogen economy. Research Reactors I. Research and training material testing. II. Production of radio isotopes for medicine and industry. Nuclear Fuel Production Reactors I. The breeder reactors II. Reactors used to produce weapon grade plutonium
9 2) Differentiate between the function of the neutron poisons and the function of neutrons moderators. Neutron Poisons ( Absorbers) Using neutron poisons (neutron absorbers) which absorb excess neutrons to control the nuclear reaction. Using neutron moderators, which reduce the velocity of Neutron Moderators fast neutrons, thereby turning them into thermal neutrons which are more likely to be absorbed by other nuclei. 3) Referring to the figure shown below, describe how the steam pressure could be reduced during accidents which cause reactor coolant leakage. Answer: During accidents the reactor coolant converts to steam in the drywell and pressure builds up quickly. Vent pipes or tubes from the drywell Direct the steam below the water level in the wetwell. This condenses the steam and reduces the pressure
10 Question V Answer the following questions: A. For a pressurized water reactor, the containment building encloses the following components: marks each) I. The steam generator. II. III. The entire reactor building. The pressurizer. B. There are three different containment building designs based on their shapes, these are: I. Can design II. III. Spherical Design Combined design( Can and Spherical) C. Control rods are used to control the chain reaction in the nuclear reactor, beside that, the control system includes a number of devices,these are: I. Sensing elements that measure the number of neutrons. II. Other devices to regulate the position of the control rods.
11 Question VI 1) Given the following reaction: a) State the type of the above reaction. Nuclear Fusion Describe the reaction. Nuclear fusion involves two atomic nuclei (Deuterium and Tritium) joining To make a large nucleus (Helium). Energy and fast neutrons are released when this happens. b) State two disadvantages of utilizing the heat generated by this reaction in electrical power generation. Any two of the following: 1. Fusion reactions can produce fast neutrons, a highly energetic and dangerous form of nuclear reaction. 2. This requires replacing the shielding material periodically which makes the operation of the fusion power plant expensive and impractical. 3. Lithium can be used to slowdown these neutrons, but lithium is chemically reactive and rare so its use is not practical. 2) In many countries, the fuel assemblies, after being in the reactor for 3 to 6 years, are stored underwater for 10 to 20 years. Suggest two reasons for using water as storage medium for spent fuel. A. It serves as a shield to reduce the radiation levels that people working above may be exposed to. B. It cools the fuel assemblies that continue to produce heat (called decay heat) for some time after removal.
12 3) Match the nuclear reactor or the power plant type in column (A) with the correct figure in column (B). Write your answer in the answer box provided Column A Column B B C A E G H D F No Column (A) Letter Column ( B ) 1 A Boiling water reactors (BWR) 2 B Pressurized water reactors (PWR) 3 C Pressurized heavy water reactors (PHWR)-CANDU. 4 D Advanced power reactors (APR1400).
13 5 E Gas-cooled reactor (GCR) 6 F Advanced Gas-cooled Reactor (AGR) 7 G Fast breeder reactor (FBR) 8 H Steam power plant
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