Siphon breaker design requirements

The Siphon Breaker Design Requirements Project was intended to provide experimental data on siphon flow effects. In addition, the experimental system was to be modeled with the RELAP code and the predicted and measured performances compared. The design and operation of the siphon breaker experimental equipment from 1989 to 1991 are described. In addition the test results for all the experimental runs made in 1990 and 1991 are presented and described. Unfortunately, useful results were not obtained from a RELAP 5 model of the siphon system; consequently, we are unable to present any predictive calculations for comparison with the data presented. We have had lots of expert advice from several sources on using the RELAP code but to date our efforts have remained unsuccessful. After an extra year of effort, admittedly part-time but a lot of that, the modeling efforts was abandoned and the experimental equipment and test results are described.