Stochastic Implicit Euler burnup scheme

From Serpent Wiki
Revision as of 08:12, 29 September 2017 by Ville Valtavirta (Talk | contribs) (Input)

Jump to: navigation, search

The Stochastic Implicit Euler (SIE) burnup scheme is an alternative burnup scheme that can be used if the traditional predictor-corrector burnup schemes in Serpent exhibit unstable behavior.

Background

The theoretical background of the SIE scheme is described in [1]

Input

The SIE burnup scheme can be chosen with the set sie input card. The number of iterations for each burnup steps can be specified.

Some additional input options that many times are combined with the set sie card are set fsp for passing the fission source from the end of previous neutron transport solution to the beginning of the next one, and set cpop to use an alternate (typically lower) neutron population for the SIE iteration (compared to the neutron population used on the initial predictor step.

Implementation

Usage

Noteworthy things

  • No neutron transport solution is actually calculated using the final concentrations for a certain point.

References

  1. ^ Dufek, J., Kotlyar, D. and Shwageraus, E. "The stochastic implicit Euler method – A stable coupling scheme for Monte Carlo burnup calculations", Ann. Nucl. Energy, 60 (2013) 295-300