SAS2A LMFBR accident-analysis computer code

LIMBO computer code for analyzing coolant-voiding dynamics in LMFBR safety tests

“…The coolant dynamics models in SAS-2A 6 and SAS-3A 7 represent further refinements of the earlier bubble models. The SAS-2A code has a multibubble model which is necessary for the simulation of the early quasi-steady phase of the boiling transient.…”

Investigation of the physical and numerical foundations of two-fluid representation of sodium boiling with applications to LMFBR experiments

“…With the aid of The only empirically determined coefficient, b, is obtained I-VhNW---~Liil--ru-y_~l.__U u_~---r- For computational purposes, it is necessary to derive the relationship between the bulk liquid temperature, Tm, and the interfacial liquid temperature, T 6 . From Eq (5.…”

SACO-1: a fast-running LMFBR accident-analysis code

“…The model described here is based on the analogous model of SAS2A. 9 Two differences are that SACO uses constant (versus temperature-dependent) heat-tansfer coefficients and does not treat a volume heat source due to direct heating of the cladding and coolant by neutron and gamma radiation. A third difference is that the temperature of the structure (can wall and wire wrap) is not calculated; however, the heat capacity of the structure is accounted for in the heat capacity of the cladding.…”

“…where TRclpt di = (c.A)" (9) The coolant temperatures at the bottom axial node are determined by the inlet temperature, TIN. Then, with the cladding and coolant temperatures at the beginning of the time step known, the cladding temperature at the new time step is extrapolated according to Tcl(z, t + At) = Tcl(z, t) +…”