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Wesley Deason , Saturday, January 26 th , 2013 2013 OSU-ANS Winter Conference

Modeling and Analysis of a Representative Fission Product Removal System for a Vented Helium Cooled Fast Reactor. Wesley Deason , Saturday, January 26 th , 2013 2013 OSU-ANS Winter Conference . Agenda. Background Project Purpose Project Methods Current Progress Future Work.

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Wesley Deason , Saturday, January 26 th , 2013 2013 OSU-ANS Winter Conference

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  1. Modeling and Analysis of a Representative Fission Product Removal System for a Vented Helium Cooled Fast Reactor Wesley Deason, Saturday, January 26th, 2013 2013 OSU-ANS Winter Conference

  2. Agenda • Background • Project Purpose • Project Methods • Current Progress • Future Work

  3. What is Vented Fuel? • Simply the venting of accumulated fission product gases. Why vent? • Removes cladding pressure • Decreases volatile source term • Allows greater control of fission products

  4. Historic Vented Fuel Design General Atomic: Peach Bottom Unit 1 General Electric: Fast Ceramic Reactor

  5. Project Purpose • To quantify feasibility and safety. • Feasibility • Can it be built for reasonable cost? • Is Commercial or Government research required? • NRC approval? • Construction time? • Safety • Is it more safe or less safe than current designs?

  6. Current Progress • Completed Extensive Literature Review • Previous Reactor Designs • PB Unit 1, GCFR, SFR, LMFRB, DFR, EM2, TID, GFR • Helium Purification System Design • Filter/Absorbers, molecular sieves, and cold charcoal beds • Fission Gas Behavior in HTGRs • Release Rates from fuel

  7. STELLA Modeling • Determination of significant fission products • Ignore short lived and low yield fission products

  8. STELLA Modeling • Development of an accurate and efficient modeling methodology • Ideal: model all significant nuclides together • Activation/Depletion due to Neutron Absorption • Interdependence due to chemical reactions • Parent/Daughter decay chain tracking throughout system

  9. STELLA Modeling • Development of an accurate and efficient modeling methodology • Compromise: model significant decay chains together • Parent daughter decay chain tracking in system • Assume activation and depletion of fission products is minimal in fast environment • Treat chemical interactions independent from other elements

  10. STELLA Modeling

  11. Future Work • Determination of interaction parameters • Element dependent • Filter fractions • Leakage fractions • Plate-out (adsorption) fractions • Development of desired system studies • Tests for meeting project objectives • Reach conclusions on system feasibility and safety

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