The SEBIM Tandem (POSV type Compact Tandem Safety Valves CTSV) features a unique design for redundant safe closure in the over-pressure protection of cooling circuits.

The SEBIM CTSV is the successor to the cold solution which has been in operation since the 1980s in French Pressurised Water Reactors. This Hot Solution design has operated globally since 1995 in VVER and CANDU reactors.The SEBIM CTSV fits various types of nuclear reactors which require high and low overpressure protection on liquid, steam, gas and steam/water mix applications.