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The Instrumented Fast-Reactor Accelerated Component-Sheath Insulator test (IFAC-SI) is a key experiment of the Thermionic Fuel Element (TFE) Verification Program designed to allow continuous monitoring of sheath insulator specimens with an applied voltage during the in-reactor test. The insulators are cermets, an alumina matrix with a dispersion of niobium particles, sandwiched between two cylinders of niobium. The IFAC-SI experiment is designed to monitor the applied voltage, resistance, and temperature of two sets of three specimens while maintaining the sets at two desired operating temperatures. The temperature control is achieved using two separate vapor controlled heat pipes contained in the vacuum space of a stainless steel capsule. The capsule will be tested in a modified In-Core Instrument Test facility (INCOT) wet thimble design at the Experimental Breeder Reactor II (EBR II).