FLASH-6: a FORTRAN IV computer program for reactor plant loss-of-coolant accident analysis (LWBR development program). [NONE]

The FLASH-6 computer program may be used to simulate the Loss-of-Coolant Accident or other severe reactor plant transients. As with previous versions of the FLASH programs, FLASH-6 permits the user to model the reactor plant using a flexible combination of control volumes (nodes), connecting flow paths, pumps and steam generators. FLASH-6 allows up to 80 pressure determining nodes within the reactor core and 30 nodes in the remainder of the plant. Improvements over previous versions of the FLASH programs are incorporated into the water property calculations, momentum equation model, main coolant pumps, beyond CHF heat transfer options, fuel rod thermal model, gap conductance, clad expansion, and phase separation models.