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Manuscript Title: RETRANS: a program for calculating reactivity transients.
Authors: G. Kamelander
Program title: RETRANS
Catalogue identifier: AADB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 39(1986)105
Programming language: Fortran.
Computer: SIEMENS 7-541.
Operating system: BS-2000.
RAM: 160K words
Word size: 8
Keywords: Reactor systems, Reactor kinetics, Reactor dynamics, Transient overpower Accidents, Finite difference method.
Classification: 22.

Nature of problem:
RETRANS is appropriate to calculate power excursions in light water reactors initiated by reactivity insertions due to withdrawal of control elements. The neutron physical model is based, just as in the well-known TWIGL-code, on the time-dependent two-group neutron diffusion equations. The equation of state of the coolant is approximated by a table built into the code. RETRANS solves the heat conduction equation and calculates the heat transfer coefficient for representative fuel rods at each time-step.

Solution method:
The time-dependent neutron diffusion equations are modified by an expotential transformation and solved by means of a finite difference method. There is an option accelerating the inner iterations of tehe difference scheme by a coarse-mesh rebalancing method. The heat balance equations of the thermohydraulic model are discretized and converted into a tridiagonal system of linear equations which is solved recursively.

Restrictions:
r-z-geometry, one-phase-flow.