Primary Report: The Effect of Externally Mounted Thermocouples on Cladding Temperature Behavior During Blowdown Transients. Part II. Experimental Procedure and Data

摘要

Tests dealing with the effect of LOFT-type thermocouples which are externally mounted on the cladding on the temperature behavior of the rod during a blowdown transient were carried out in the COSIMA Blowdown Test Facility of the Nuclear Safety Project at the KfK (Karlsruhe Nuclear Research Center). Decisive for the execution of the present tests on the effect of thermocouples on the rod behavior in the COSIMA facility was the possibility provided by that facility for measuring the cladding temperature without influencing the thermodynamic and thermohydraulic conditions on the rod surface; measurement was done with eight pyrometers. At the same time there was the possibility for making a comparison between the cladding temperature measurement with thermocouples and that with pyrometers during the transients. The fuel rod simulator used corresponds in design to the SIM II type rod on the cladding of which four thermocouples were attached by EG and G using the original LOFT assembly method. (ERA citation 05:032306)