Design, development and qualification of fast response temperature sensors for Sizewell B

For Sizewell B pressurized water reactor, one of the important variables to be measured is reactor coolant temperature. The authors describe how these measurements are achieved by the provision of temperature sensors mounted in the reactor coolant loops. These sensors provide safety-grade temperature measurement signals to both the primary protection system (PPS) and the secondary protection system (SPS). The temperature measurements must be of adequate range and offer a sufficiently rapid response to provide accurate and timely signals to the reactor protection systems for reactor trip and engineered safeguard features actuation functions.<>