Fullscale tests with an Isolation Condenser (IC) as proposed for the SBWR from GE have been performed in the PANTHERS facility. Because the results are proprietary special tests have been performed in the PANDA facility, see Appendix B.

The design of an IC is schematically shown in Fig. 7; vertical tubes are connected to an upper (inlet-) header and a lower header.

Tests with pure steam as well as tests with a mixture of steam and helium (up to about 14 per cent) were performed.

In Fig. 8 test results with pure steam and calculated results with ATHLET are shown.