[en] An analysis tool is constructed for the purpose of predicting the transient hydrodynamics resulting from the rapid filling of voided piping systems. The basic requirements of such an analysis tool are established, and documentation is presented for several fluid transient computer codes which were considered for the tool. The code modifications necessary to meet the analysis tool requirements are described. To test the computational capability of the analysis tool a verification problem is considered and the results reported. These results serve only to demonstrate the applicability of the analysis tool to this type of problem; the code has not been validated by comparison with experiment. Documentation is provided for a brief sensitivity study involving the sample problem. Additional analysis tool information, as well as detailed sample problem results are included in the form of appendices