TRAC-BD1 analysis of a small break test in the ROSA-III facility

A best-estimate, TRAC-BD1 computer simulation and subsequent code/data comparison was conducted for Run 912 of the ROSA-III small break LOCA test series. Run 912 is a simulated 5% split break in the recirculation piping, assuming failure of the high pressure core spray. The Organization for Economic Cooperation and Development designated this test as International Standard Problem 12. One objective of this work was to provide results for the United States Nuclear Regulatory Commission's participation in International Standard Problem 12. This work also serves a second objective through its applicability to the Nuclear Regulatory Commission's code assessment objectives. Results from the code-calculated behavior, with comparisons to the experimental data, are presented. These results indicate that TRAC-BD1 gave reasonable results over a wide range of conditions typically encountered with small break LOCAs