Comparison of NUPIPE-II and SAP IV Predicted and Experimentally Determined Dynamic Structural Responses for German Standard Problem 4A (BWR)

摘要

This paper presents comparisons between two computer code predictions and experimental measurements of the structural response of a pipe line/check valve system subjected to loading from a loss of feedwater transient. The piping system that was modeled and instrumented for measurement was the focus of German Standard Problem 4a; part of the Heissdampfreaktor Safety Program being conducted in the Federal Republic of Germany. The availability of their experimental data offered EG and G a unique opportunity to evaluate two structural codes' predictions, to compare them with each other, and to compare their predictions with the actual measured values of acceleration and displacement. A thermal-hydrualic code, SOLA-LOOP, computed the hydraulic behavior of the system. The hydraulic forcing functions were calculated and placed into the structural codes, NUPIPE-II and SAP IV. It was concluded that both computer programs provided comparable, realistic predictions of the piping system dynamic response to a blowdown load. (ERA citation 08:043906)