A Comparative Analysis of the International Standard Problem 8 Calculations

摘要

The report is the final documentation of the comparison of various calculations for International Standard Problem 8 (ISP8), which consists of Semi-scale Test S-06-3 with 200 percent cold leg break. The test was performed to simulate the blowdown, refill, and reflood stages of the LOFT Nuclear Test L2-3. The test was predicted by various organizations using different codes such as RELAP4/MOD5, RELAP4/MOD6, RELAP-UK, ALARM-P1, and DRUFAN. The results of these calculations have been discussed and compared with the test data according to the successive stages of the accident and the type of code used. The observations regarding the user dependence and performance of these five codes are also reported. Also, a comparison between the RELAP4/MOD6 and the RELAP4/MOD7 calculations has been presented in the Appendix.