Temperature measurements of dry quarantined channels of PHWR using intelligent data acquisition system

Zircaloy Pressure tubes in the dry quarantined condition operates at higher temperature due to gamma heating and undergoes relatively faster oxidation on its surface. One such dry quarantined pressure tube in MAPS was found to be extensively oxidized and broken into number of fragments. Temperature is one important factor, which has a bearing on the state of health of the pressure tubes in dry quarantined condition. Hence measurement of the temperatures at different locations along the length of such pressure tubes during reactor operation is needed for predicting the state of pressure tubes. The paper describes development of an in-reactor temperature measurement device with a PC based intelligent data acquisition system designed and developed for this purpose. The system can be reliably used for temperature measurement of dry quarantined channel of PHWR. It is proposed to use the system in RAPS-l reactor. (author)