SUBJECT: | M.S. Thesis Presentation |

BY: | David Koch |

TIME: | Monday, November 24, 2014, 12:00 p.m. |

PLACE: | Boggs Building, 3-47 |

TITLE: | Investigation and Improvement of Criticality Calculations in MCNP5 involving Shannon Entropy Convergence |

COMMITTEE: | Dr. Bojan Petrovic, Chair (NRE) Dr. Nolan Hertel (NRE) Dr. Dingkang Zhang (NRE) |

SUMMARY
Criticality calculations are often performed in MCNP5 using the Shannon entropy as an indicator of source convergence for the given neutron transport problem. The Shannon entropy is a concept that comes from information theory. The Shannon entropy is calculated for each batch in MCNP5, and it has been shown that the Shannon entropy tends to converge to a single value as the source distribution converges. MCNP5 has its own criteria for when the Shannon entropy has converged and recommends a number for how many batches should be skipped; however, this value for how many batches should be skipped is often not very accurate and has room for improvement. |