MCNPX-CINDER’90 Simulation of APT Radionuclide Production and Decay Heat Experiments C.T. Kelsey, J.L. Ullmann, K.A. Woloshun, G. Muhrer and E.J. Pitcher Los Alamos Neutron Science Center, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA Radionuclide production and decay heat experiments were run in the mid 1990s as part of the Accelerator Production of Tritium (APT) project for the purpose of validating transmutation calculations performed using the LAHET, MCNP and CINDER’90 codes. Since the experiment reports comparing code and measurement results were released LAHET and MCNP have been combined to form MCNPX and development of MCNPX and CINDER’90 has continued. The results of radionuclide inventory calculations using MCNPX and CINDER’90 are used for safety basis and design calculations and a large part of the foundation for their validity remains the APT experiments. Software quality management requires verification that modified code continues to perform as expected. Here the most recent versions of MCNPX and CINDER’90 were used to simulate the experiments. Both MCNPX’s default Bertini physics process and the recently added CEM03 process were considered. Calculation and measurement results were compared. MCNPX-CINDER’90 agreement with measurement using either Bertini or CEM03 physics is comparable to that of the original LAHET-MCNP-CINDER’90 simulations. In general individual radionuclide activities appear to be predicted within a factor of two about half the time and decay heat to within 10 percent.
Pages to are hidden for
"MCNPX-CINDER90 Simulation of the APT Radionuclide Production "Please download to view full document