Comparison of RELAP4/MOD6 with forced-feed reflood data

Comparisons of RELAP4/MOD6 code calculatins and experimental data from FLECHT and Semiscale forced feed reflood tests were made. These comparisons were made as part of a larger effort to verify the capabilities of the code using a wide variety of exprimental configurations and conditions. Ground rules for code usage were established and rigidly adhered to during base runs of each test. In certain fruitful areas, diagnostic studies were made subsequent to the verification base runs to clarify the previous results. Adequate, inadequate and incomplete features of the verification process and the code are identified. Recommendations are made regarding potential code and modeling improvements