CEBUG, 3-D Transient Hydraulics for Na H2O Reaction by Finite Elements Method

1 - Description of problem or function: The transient hydraulic behavior of the sodium in a sodium-heated steam generator in which a sodium-water reaction occurs due to a large water leak is calculated for flows in up to three dimensions. 2 - Method of solution: The method of finite elements is used to calculate the pressures in the multi-dimensional bubble growth region. 3 - Restrictions on the complexity of the problem - Maxima of: 140 elements in 3-D region (including transition elements), 30 channels, 30 channel nodes, 5 transition elements, 1 cover gas space, 28 connections to finite elements for each transition element, 4 connections to channels for each transition element, 200 time-steps saved in plot output array. In general, the following assumptions also apply: A single water leak occurs instantaneously. The chemical reaction is instantaneous. All water reacts to form NA2O and H2 at 1800 degrees F. The hydrogen bubble expands isothermally. The sodium is incompressible. The steam generator does not deform. The analysis stops when the hydrogen bubble reaches a cover gas space or completely fills a flow channel