Analysis code for failure propagation of steam generator tube "LEAP II"

not registered; Miyake, Osamu; Daigo, Yoshimichi; not registered

A computer code, LEAP (Leak Enlargement and propagation), was developed in order to analyze failure propagation phenomenon in an LMFBR steam generator. This code calculates a water leak rate change from the initiation of water leakage to the termination of sodium-water reaction by the water dump. It consists of such components as; the operational condition of the steam generator, the calculation of the water leak rate, the decision of jet impingement, target wastage, the penetration of the target tube, the self-enlargement of the leak nozzle, the calculation of the leak detection schedule, the calculation of the cover gas pressure, and time step control. Here reported are calculation models, analytical methods, the source program organization, and the input/output forms. This program was developed originally in 1978 by Kawasaki Heavy Industries and has been modified in some points to reflect the results of research and the development of the sodium-water reaction tests.