D3SJ Talk. The Latest on the Thorium Cycle as a Sustainable Energy Source. Philip Bangerter. 4 May 2011
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1 D3SJ Talk The Latest on the Thorium Cycle as a Sustainable Energy Source Philip Bangerter 4 May 2011
2 About the Speaker Philip Bangerter Process Engineer of 30 years experience Mining industry Sustainability in design, 8 years Employed currently in an employee-owned engineering consultancy Globally 8,500 employees; 1800 in Australia
3 Summary Covering Claims to Sustainability Periodic Table & Fission Basic Reactor Designs Sources of Thorium in ores Thorium Reactors in Operation Embodied Energy Discussion Points Not Covering The correctness of pursuing an energy alternative The detail of reactor design Accidents
4 Claims Potential advantages over Uranium The thorium fuel cycle claims several potential advantages over a uranium fuel cycle, including: greater abundance (about 4 times); superior physical and nuclear properties; enhanced proliferation resistance; reduced plutonium & actinide production; & the ability to burn nuclear wastes materials.
5 Periodic Table Thorium, Uranium and the Transuranics kfhlksjhklajdhkldfh
6 Fission
7 Nuclear Reactor Types Thorium Fuel Applicability Light Water Reactors Heavy Water reactors Graphite Moderated Fast Breeder Reactors Pressurised Water (PWR) Boiling Water (BWR) Pressurised Heavy Water reactors (CANDU) Gas Cooled (GCR) Light Water cooled Gas Reactors (LWGR) Liquid Metal Fast Breeder Reactors (LMFBR) 61% 21% 10% 4% 4% 1% Water as Moderator Water as Moderator Direct steam Deut. as Moderator Direct steam No enrichment Graf. as Moderator Direct steam No enrichment Chernobyl type No Moderator Extra enrichment Less waste Th - KAMINI Th - AHWR Th Accelerator (ADS) Th Liquid Fluoride (TFTR) Th - FBTR
8 Schematics of Designs U-Pu Light Water
9 Schematics of Designs Th Liquid Fluoride
10 Schematics of Designs Th Accelerator-driven System (ADS) Expensive (Capital) Existing technologies Inherent safety
11 Waste products kfhlksjhklajdhkldfh
12 Rule-of-Thumb Thorium Fuel vs. Alternatives Thorium Uranium Coal Liquid Fluoride reactors Light Water Reactors Thermal Power Station 1 Tonne Th in liquid 322 Tonnes U in solid fuel 3.5 Million Coal Tonnes 0.9 tonnes spent fuel needing 300y storage 43 tonnes spent fuel needing up to 100,000y storage 2000 t of toxics 58,000 t SO x 14,000 t NO x 7Million tonnes CO 2 All dispersed into the environment plus 500,000 t of ash disposed in landfill 1 GWy of electricity 1 GWy of electricity 1 GWy of electricity
13 Resources Disposition by Country Reports vary, but in summary, Thorium Reserves are widely distributed
14 Sources of Th Thorite hard rock vs. Beach Sand based Monazite Thorium occurs in several minerals including thorite (ThSiO4), thorianite (ThO2 + UO2) and monazite. Today s production of Thorium is from Monazite; Australia is a leading producer of Monazite (as a waste).
15 Existing Th Reactors Page 1 kfhlksjhklajdhkldfh
16 Existing Th Reactors Page 2 kfhlksjhklajdhkldfh
17 Characteristics of Thorium as a fuel Advantages Th extracted from an existing waste material Single isotope excludes enrichment step Fertile conversion of Th is more efficient than U ThO 2 is more stable than its U equivalent and does not further oxidise The radiological hazards are far lower than U; less transuranics are produced
18 Characteristics of Thorium as a fuel Disadvantages Th is not easily substituted into existing reactor types; requires the adoption of Liquid Fluoride or Accelerator designs There is no existing industry, like Uranium; development times are somewhat lengthy due to technical risks There is no weapons-relevant by-product, so no military funding
19 Proliferation Risk Th cycle vs. U cycle Th cycle proliferation risk is orders of magnitude less because: Thorium is not fissile There is no enrichment step The fissile material that can be produced leaves an obvious signature (U-233 is contaminated with U-232 from which it can not be chemically separated and has several decay products which emit high energy gamma radiation). A liquid fluoride design negates U-232 extraction
20 Embodied Energy Question Thorium vs. true renewables rules-of-thumb The embodied energy (EE) of the plant structures is a tiny proportion of the total operating energy; this is even less an issue if the EE is from green sources A Thorium facility will have significantly less EE than a wind or solar facility per kw/h Plant turnover is years The EE of the fuel source is relevent
21 Discussion Point summary For society A viable carbon-effective energy source A safer option than Uranium May even help existing waste disposal Uses an existing waste product
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