Nuclear Power Reactors. Kaleem Ahmad
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1 Nuclear Power Reactors Kaleem Ahmad
2 Outline Significance of Nuclear Energy Nuclear Fission Nuclear Fuel Cycle Nuclear Power Reactors Conclusions Kaleem Ahmad, Sustainable Energy Technologies Center
3 Key Role of Nuclear Energy in the Proposed Energy Mix of KSA Introduction of ~50% sustainable energy to Saudi Arabia's energy mix Nuclear energy is an integral part of Kingdom energy plan It projects 17 GWe of nuclear capacity by 2032 Kaleem Ahmad, Sustainable Energy Technologies Center
4 Why Nuclear Energy Nuclear energy is a base load energy source that generates power more than 90 percent of the time, 24 hours a day, 365 days a year on average. Essential part of Kingdom energy mix strategy according to a Royal Decree Readily available, reliable proven technology without contributing to climate change Cost for nuclear is competitive with oil and gas as well as with renewable energy Kaleem Ahmad, Sustainable Energy Technologies Center
5 Greenhouse Gas Mitigation Nuclear energy is a vital component of a clean energy strategy. Currently nuclear generation avoids the emission of over two billion tonnes of carbon dioxide each year. Nuclear power has already prevented the release of around 56 gigatonnes of carbon dioxide since 1971 equivalent to two years of global emissions at current rates. Kaleem Ahmad, Sustainable Energy Technologies Center
6 Nuclear Fission Kaleem Ahmad, Sustainable Energy Technologies Center
7 Nuclear Fission A reaction in which an atomic nucleus of heavy elements notably uranium and plutonium splits by bombardment of a neutron, with simultaneous release of large amounts of energy is called fission U % U % Kaleem Ahmad, Sustainable Energy Technologies Center
8 Fission Chain Reaction Kaleem Ahmad, Sustainable Energy Technologies Center
9 Nuclear Fuel Cycle
10 The Nuclear Fuel Cycle The Nuclear Fuel Cycle consists of sequence of steps in which uranium ore is mined, milled, enriched, and fabricated into nuclear fuel and then irradiated in a reactor for several years Nuclear Fuel is highly engineered manufactured product. Materials comprising the core are more pure than the medicine we swallow and the machined precision of fuel assemblies is comparable to that of fine wrist watch. 10
11 Nuclear Fuel Cycle Uranium Mining and Milling Conversion to UF 6 Enrichment Fuel Fabrication Power Reactors Waste repository
12 Uranium Mining and Milling Uranium deposits are found in rocks around the world Open pit mining Underground mining In-situ recovery Mined rock is crushed and then leached to dissolve out the uranium, which is then precipitated out of solution as the uranium oxide U 3 O 8, sometimes known as 'yellowcake' 12
13 Refining and Conversion Refining A series of chemical processes separate the uranium from impurities, producing high-purity uranium trioxide (UO3). Conversion UO3 is converted to uranium dioxide (UO2) for use in heavy water reactors, or to uranium hexafluoride (UF6) for enrichment, before it can be used in light water reactors. 13
14 Enrichment Uranium-235 is the uranium isotope that can be used in fission, but it makes up only 0.7% of naturally occurring uranium Enrichment processes increase the concentration of U-235 to about 3% 5%. After undergoing enrichment, the UF6 is chemically transformed back into UO2 powder. Natural Uranium 14
15 Enrichment The two method of uranium enrichment are: Gaseous diffusion Centrifugation
16 Gaseous Diffusion Enrichment
17 Centrifuge Enrichment Depleted exit Feed Enriched exit Feed to Next Stage U238F 6 is heavier and collects on the outside walls (Depleted/Tails) U235F 6 is lighter and collects in the center (enriched)
18 Fuel Fabrication Reactor fuel is generally in the form of ceramic pellets. These are formed from pressed uranium oxide which is sintered (baked) at a high temperature (over 1400 C). The pellets are then encased in metal tubes to form fuel rods, which are arranged into a fuel assembly ready for introduction into a reactor.
19 Fuel Pellets
20 Nuclear Fuel Assembly Fuel Pellet
21 Fuel Assemblies are Inserted in Reactor Vessel
22 Nuclear Fuel Cycle with Reprocessing
23 Nuclear Power Plants Kaleem Ahmad, Sustainable Energy Technologies Center
24 Kaleem Ahmad, Sustainable Energy Technologies Center Nuclear Reactor A nuclear reactor is a system that contains and controls sustained nuclear chain reactions. Commercial reactors are used for generating electricity, Propulsion power for submarines/ships Producing medical isotopes for imaging and cancer treatment Conducting research, training and material testing.
25 Nuclear Reactor Components 1. Fuel rods These contain U235 or Pu239. They become very hot due to nuclear fission. 2. Control rods Made of boron, when placed in-between the fuel rods these absorb neutrons and so reduce the rate of fission to control the reactor power. 3. Moderator This surrounds the fuel rods and slows neutrons down to make further fission more likely. Kaleem Ahmad, Sustainable Energy Technologies Center
26 Nuclear Reactor Components (cont.) 4. Coolant This transfers the heat energy of the fuel rods to the heat exchanger. Coolant be water, carbon dioxide gas or liquid sodium. 5. Steam Generator Feed water is converted into high pressure steam using the heat energy of the coolant. 6. Reactor pressure vessel This is a thick steal vessel designed to withstand the very high pressure and temperature. Kaleem Ahmad, Sustainable Energy Technologies Center
27 Nuclear Reactor Components (cont.) Kaleem Ahmad, Sustainable Energy Technologies Center
28 Types of Nuclear Reactors 1. Light Water Reactors Pressurized Water Reactor (PWR) Boiling Water Reactor (BWR) 2. Heavy Water Reactors Pressurized Heavy Water Reactor (PHWR- CANDU) 3. Fast Breeder Reactor (FBR) Kaleem Ahmad, Sustainable Energy Technologies Center
29 Pressurized Water Reactor (PWR) 3.2% U-235 Fuel 2-4 Loops => Steam UO 2 Pellets in Zircaloy ~32% Efficiency Pressurizer Steam Generator Top entry control rod Kaleem Ahmad, Sustainable Energy Technologies Center
30 Boiling Water Reactor (BWR) 3.2% U-235 Fuel UO 2 Pellets in Zircaloy ~32% Efficiency Bottom entry control rod Direct cycle cooling Kaleem Ahmad, Sustainable Energy Technologies Center
31 CANDU-Pressurized Heavy Water Reactor (PHWR) Natural UO 2 Pellets (fuel) Heavy water (coolant + moderator) Online refueling Kaleem Ahmad, Sustainable Energy Technologies Center
32 Nuclear Electricity Generation of Top Countries Nuclear power plants provided 12.3 percent of the world's electricity production Kaleem Ahmad, Sustainable Energy Technologies Center
![Reactor Type Reactor Type Descriptive Name Number of Reactors Total Net Electrical Capacity [MW] Pressurized Light-Water-Moderated and Cooled PWR Reactor 282 263387 BWR Boiling Light-Water-Cooled and](/docs-images/76/73388829/images/33-2.jpg "Moderated Reactor 78 74755 Pressurized Heavy-Water-Moderated and Cooled Reactor 49 24549 PHWR GCR Gas-Cooled, Graphite-Moderated Reactor 15 8175 LWGR Light-Water-Cooled, Graphite-Moderated Reactor 15")
33 Reactor Type Reactor Type Descriptive Name Number of Reactors Total Net Electrical Capacity [MW] Pressurized Light-Water-Moderated and Cooled PWR Reactor BWR Boiling Light-Water-Cooled and Moderated Reactor Pressurized Heavy-Water-Moderated and Cooled Reactor PHWR GCR Gas-Cooled, Graphite-Moderated Reactor LWGR Light-Water-Cooled, Graphite-Moderated Reactor FBR Fast Breeder Reactor Total Kaleem Ahmad, Sustainable Energy Technologies 441 Center
34 Reactors under construction Kaleem Ahmad, Sustainable Energy Technologies Center
35 Nuclear Energy Research To carry out research and development in important areas of nuclear science and technology to complement the Kingdom s Nuclear Energy Program Current Research Activities Development of high performance thermoelectric energy harvester for nuclear safety applications Laser spectroscopic studies for nuclear fuel, safety, and safeguard applications Developing simulation models and techniques for nuclear safety and water desalination 35
36 Development of high performance thermoelectric energy harvester for nuclear safety applications Power safety sensors and communication devices for reactor safety Spent fuel monitoring in nuclear industry Automobile Industry Provide 30% of car s electrical requirement More than 5% reduction in fuel consumption 36 36
37 Education and Training Master Program in Nuclear Engineering Post Diploma Training Program for Technicians Post Graduate Training program for Engineers/Scientists Kaleem Ahmad, Sustainable Energy Technologies Center
38 Conclusions Nuclear energy is a crucial component of Kingdom s energy mix strategy. Nuclear power is one of the major low-carbon energy source and could play a significant role in ensuring sustainable and reliable energy supplies while curbing GHG emissions in the Kingdom. Modern nuclear power plant designs are more inherently safe and are less capital intensive, thereby making them attractive as compared to other energy sources. SET can play a vital role in assisting and promoting Kingdom s program for development of nuclear energy. Kaleem Ahmad, Sustainable Energy Technologies Center
39 Composition of Spent fuel Rods of LWR Material Initial Fuel Spent Fuel Transuranic elements % U % Pu isotopes % Fission products % U % 0.08% U % 94.3%
40 AREVA EPR (European Pressurized Water Reactor) 1650 MWe 36 37% Efficiency Mixed Oxide (MOX) Fuel 60 yr Service Life 3 4 yr Construction Multiple Barriers and Simple Safety Systems Kaleem Ahmad, Sustainable Energy Technologies Center
41 Advanced Boiling Water Reactor (ABWR) 1350 MWe 77% more compact than BWR design 39 month construction period GE Kaleem Ahmad, Sustainable Energy Technologies Center TOSHIBA, Kashiwazaki-Kariwa Unit 6, Japan
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