The Nuclear Fuel Cycle Mary Lou Dunzik-Gougar, PhD ANS Teachers’ Workshop 2014.

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Presentation transcript:

The Nuclear Fuel Cycle Mary Lou Dunzik-Gougar, PhD ANS Teachers’ Workshop 2014

Uranium Mining Open pit (strip) mining Underground mining In situ leaching

Uranium Milling Ore is crushed Uranium is separated U 3 O 8 “yellow cake” produced

Uranium Conversion (to UF 6 gas) Impurities removed Uranium combined with fluorine UF 6 gas produced - Gaseous form facilitates enrichment UF 6 containers

U Enrichment  Natural U is > 99% 238 U and only ~ 0.7% 235 U  Separation of 235 UF 6 and 238 UF 6 based on (very small) mass difference  UF 6 enriched from 0.7% 235 U to 3%-5% 235 U Diffusion Centrifugation

Fuel Fabrication Uranium Oxide Ceramic Fuel Pellets Enriched UF 6 gas converted to uranium oxide (UO 2 ) solid

Fuel Fabrication Fuel rods filled with ceramic pellets are grouped into fuel assemblies

Fuel Fabrication A pressurized water reactor fuel assembly

Reactors Diablo Canyon nuclear power plant in the U.S.

In the reactor, 235 U fissions to produce... Neutrons may Cause new fissions to occur Be absorbed to form unstable, radioactive nuclide Neutrons Energy Fission Products Neutron

Fuel Consumption in the Reactor Fuel is in reactor for 4 – 6 years U consumed, fission products and transuranics (mostly Pu) produced 4% 3.5% 94% 235 U 238 UPu Fission Products Transuranics (or Actinides) 96% Fresh Fuel Used Fuel

Used Nuclear Fuel Storage Used fuel first stored in pool at least 5 years o Cooling and shielding Older fuel can move to dry casks o Air cools o Steel and concrete shields

Fuel recycle/reprocessing 4% 3.5% 94% 235 U 238 UPu Fission Products Transuranics (or Actinides) 96% Fresh Fuel Used Fuel

Geologic Repository The choice of countries worldwide U.S. has studied Yucca Mt., Nevada as potential location

The End...

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