Update to version 1.1.14 (16 November , 2010)

The Major new feature in version 1.1.14 is the B1 fundamental mode calculation, which applies a leakage correction to homogenized cross sections (see Sec. 5.16 in the User's Manual). The procedure is very similar to the methods used in deterministic lattice transport codes. The Monte Carlo simulation is run to produce homogenized micro-group cross sections for B1 equations. The equations are solved separately, and the resulting critical spectrum is used to re-homogenize the cross sections.

With the implementation of this method, there is a good chance of confusion in the terminology. Earlier versions of Serpent have an iteration mode, which is an attempt to perform the fundamental mode calculation during the Monte Carlo simulation (see Sec. 5.15 in the User's Manual). It is important to realize that this is an experimental leakage correction without theoretical foundation and the results are not satisfactory when compared to deterministic calculations. This calculation mode must not be confused with the new method implemented in version 1.1.14.

Other new features include:

  • Doppler-broadening rejection correction (DBRC) on free-gas scattering kernel (option "dbrc", Sec. 5.6)
  • Predefined energy grids in detector calculation (mode 4 for parameter "ene", Sec. 7.1.2)
  • Threshold energy cut-off for transmutation reactions (option "xsecut", Sec. 8.4.5)
  • Quadrant symmetry option (option "usym", Sec. 5.7)
  • Plotter routine changed

Version 1.1.14 fixes bugs in universe rotations and constant-flux burnup calculation with predictor-corrector method. For minor bug fixes, see the topic on known issues and other recently posted messages at the discussion forum.

Note that the manual references are for the User's Manual dated November 15, 2010. Section numbers in later versions may differ.