RETRAN-01, a program for 1-dimensional transient thermal-hydraulic analysis of complex fluid flow systems. Revision of CCM-5. Volume 4: Applications

RETRAN represents a computer code approach for analyzing the thermal hydraulic responses of nuclear steam supply systems to hypothetical loss of coolant-accidents (LOCAs) and operational transients. In contrast to the conservative approach, RETRAN provides best estimate solutions to hypothetical LOCAs and operational transients. RETRAN is a computer code package developed from the RELAP series of codes, from reference data, and from extensive analytical and experimental work conducted relative to the thermal hydraulic behavior of light water reactor systems subjected to postulated accidents and operational transient conditions. The RETRAN computer code is constructed in a semimodular and dynamic dimensioned form where additions to the code can easily be made as improved models are developed. The extensive verification and qualification performed with RETRAN are described.