Computational methods with respect to LOCA transient analysis

LOCA simulation presents a wide range of problems to the analyst. Widely differing time scales for the important physical phenonema require the use of numerical schemes with high levels of implicitness and robust characteristics. The TRAC computer code has been designed using economical yet stable finite difference algorithms. The important short time constant phenonema are incorporated implicity and blended schemes allow material Courant limits to be exceeded in some of the one dimensional components. A new two-step procedure will allow future versions to handle small break LOCA's even more efficiently