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Covariance data: Status and Perspective at BNL

Covariance data: Status and Perspective at BNL. D. Rochman, M. W. Herman, P. Oblo ž insk ý National Nuclear Data Center, Brookhaven National Laboratory & T. Kawano T-16, Los Alamos National Laboratory. Methodology for covariance calculations at BNL. General Procedure. Optional:

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Covariance data: Status and Perspective at BNL

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  1. Covariance data: Status and Perspective at BNL D. Rochman, M. W. Herman, P. Obložinský National Nuclear Data Center, Brookhaven National Laboratory & T. Kawano T-16, Los Alamos National Laboratory

  2. Methodology for covariance calculations at BNL

  3. General Procedure Optional: Thermal neutron capture Resonance Integral Parameters Uncertainty Parameters Sensitivity an optimal recursive data processing algorithm • Fast Region • Hauser Feshbach • Pre-equilibrium • -… • Resonance Region • Breit Wigner • Reich Moore RIPL & Parameter uncertainty adjustment or Cross Section Uncertainties and Cross Section Correlations Models and parameters KALMAN Filter

  4. General Procedure • Up to today, this procedure was applied to: • Gd-152 to Gd-160 from 35 to 500 parameters (R3+URR+FaR) • Am-241 790 parameters (R3+URR) • Tc-99 1600 parameters (R3+URR) • U-233, 234, 236 from 250 to 3850 parameters (R3+URR)

  5. 152Gd(n,g): Variance

  6. 152Gd(n,g): Correlation Energy-Energy Energy (MeV) 10-5 10-7 0.001 0.1 10 Energy (MeV)

  7. 155Gd(n,g): Variance

  8. 157Gd(n,g): Correlation Energy-Energy Energy (MeV) 10-5 10-7 0.001 0.1 10 Energy (MeV)

  9. 241Am(n,f): Variance

  10. 241Am(n,f), 234U(n,f): Correlation Energy-Energy 10-5 0.001 10-7 10-7 0.001 10-5 Energy (MeV) Energy (MeV) 241Am(n,f) 234U(n,f)

  11. 236U(n,f) and 99Tc(n,g) 10-7 10-5 0.001 10-5 0.001 10-7 236U(n,f) 99Tc(n,g) Energy (MeV) Energy (MeV)

  12. Production Schedule • May 2006 : proof of principle on 8 Gd isotopes, 241Am, 99Tc, 233U, 234U, 236U • End 2006 : Codes ready and running on a 10-nodes cluster • Mid 2007 : Production of covariances for selected materials • End 2007 : Low fidelity covariances for ENDF/A (if project approved) Covariance matrix available -in any multi-group representation -at any temperatures -in tabulated form or MF33 format

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