Model development and data uncertainty integration

Swinhoe, Martyn Thomas¹ 

[1]Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: DATA COVARIANCES;    SPONTANEOUS FISSION;    PLUTONIUM 240;    EPITHERMAL NEUTRONS;    NEUTRON SPECTRA;    CROSS SECTIONS;    CORRELATIONS;    DISTURBANCES;    EMISSION;    MULTIPLICITY;    SENSITIVITY;    COMPUTERIZED SIMULATION;    VARIATIONAL METHODS;    ALPHA REACTIONS;    COMPOUND-NUCLEUS REACTIONS;    HE-3 COUNTERS;    PLUTONIUM DIOXIDE;   

DOI  :  10.2172/1227409
RP-ID  :  LA-UR--15-29271
PID  :  OSTI ID: 1227409
Others  :  TRN: US1600093

美国|英语

来源: SciTech Connect

【 摘 要 】

The effect of data uncertainties is discussed, with the epithermal neutron multiplicity counter as an illustrative example. Simulation using MCNP6, cross section perturbations and correlations are addressed, along with the effect of the ²⁴⁰Pu spontaneous fission neutron spectrum, the effect of P(??) for ²⁴⁰Pu spontaneous fission, and the effect of spontaneous fission and (??,n) intensity. The effect of nuclear data is the product of the initial uncertainty and the sensitivity -- both need to be estimated. In conclusion, a multi-parameter variation method has been demonstrated, the most significant parameters are the basic emission rates of spontaneous fission and (??,n) processes, and uncertainties and important data depend on the analysis technique chosen.