Installing and running Serpent

Running Serpent

Serpent is run from the Linux command line interface. The general syntax is:

sss2 INPUT [ options ]

Where INPUT is the input file name and the available options are:

-version	: print version information and exit
-replay	: run simulation using random number seed from a previous run
-his	: run only burnup history in coefficient calculation
-coe	: run only restarts in coefficient calculation
-plot	: stop after geometry plot
-checkvolumes N	: calculate Monte Carlo estimates for material volumes by sampling N random points in the geometry (see detailed description)
-checkstl N M	: check for holes and errors in STL geometries by sampling M directions in N points (see detailed description)
-mpi N	: run simulation in MPI mode using N parallel tasks
-omp N	: run simulation in OpenMP mode using N parallel threads
-disperse	: generate random particle or pebble distribution files for HTGR calculations (see detailed description)
-rdep	: read binary depletion file from previous calculation and print new output according to inventory list
-tracks N	: draw N particle tracks in the geometry plots or invoke track plot animation
-comp MAT [ ID ]	: print standard material composition of listed material MAT that can be copy-pasted into the inputfile (see detailed description)
-elem SYM DENS [ ID ]	: decomposes natural element identified by symbol SYM at density DENS into its constituent isotopes (see detailed description)
-qp	: quick plot mode (ignore overlaps)
-nofatal	: ignore fatal errors

Most of the input options are self-explanatory, the rest are described below.

Miscellaneous input options

Elemental decomposition

This command line option can be used to decompose natural elements in material cards into individual isotopes. The parameters include the element symbol and density or fraction (positive values for atomic and negative values for mass densities / fractions). Optional third parameter is the nuclide id, which is printed after the nuclide ZA.