Monte Carlo calculation of the effective neutron generation time

An assessment of prompt neutron reproduction time in a reflector dominated fast critical system: ELECTRA

“…In a critical reactor, the production rate is equal to the destruction rate, thus the two parameters are equal. Using the stationary homogenuos transport equation (Ott and Neuhold, 1985;Stacey, 2007) the reproduction time has in the literature dubiously been evaluated as (Leppänen, 2012;Verboomin et al, 2006):…”

“…Nevertheless, the parameter may possibly be evaluated by repeated Monte Carlo simulations using the artificial σ ∼ 1/v poisoning method (Verboomin et al, 2006), which is relatively simple and reliable. Furthermore, the reproduction time can also be indirectly evaluated from the α-eigenvalue.…”

Monte Carlo modeling and analyses of YALINA-booster subcritical assembly part 1: analytical models and main neutronics parameters.

“…Recent studies of the dynamic parameters for thermal driven systems and critical fission cores show that when the adjoint neutron flux is used as a weighting function, the calculated parameters match the experimental measurements. 29 The method illustrated in equations 11-15 for calculating the neutron prompt lifetime does not require the explicit evaluation of the adjoint flux. 30 The method is based on the insertion of a 1/v neutron absorber, such as 10 B, and on traditional perturbation theory, which can be rigorously applied only to critical reactors; however, the YALINA-Booster assembly operates close to the critical state.…”

Calculation of kinetic parameters in an accelerator driven subcritical TRIGA reactor using MCNIC method

“…Therefore, the difference between the non-weighted neutron reproduction time and the importanceweighted neutron reproduction time as an important kinetic parameter can be quite significant depending on the type of the system. This difference is very substantial especially in highly reflected reactors (Verboomen et al, 2006).…”