.. _section-9.3:

Time Step Controls
------------------

The irradiation history is provided by the user for coarse time
intervals. MFUEL subdivides these time intervals into approximately
10,000 s substeps and uses it as main time step. As described in
:numref:`section-9.2`, individual models may further subdivide the MFUEL’s main
time step. In transients, the maximum allowed time step in MFUEL is
0.01 s. If SAS’s heat transfer time step is higher than 0.01 s, MFUEL
will subdivide it to satisfy the time step requirement.