FUNCTIONAL USES OF TEMPERATURE DETECTORS Temperature DetectorsFUNCTIONAL USES OF TEMPERATURE DETECTORSTemperature sensing devices, such as RTDs and thermocouples, provide necessarytemperature indications for the safe and continued operation of the DOE facilityfluid systems. These temperature indications may include:Reactor hot and cold leg temperaturesPressurizer temperaturePurification demineralizer inlet temperatureCooling water to and from various componentsSecondary feed temperatureEO 1.6 STATE the three basic functions of temperaturedetectors.EO 1.7 DESCRIBE the two alternate methods of determiningtemperature when the normal temperature sensingdevices are inoperable.EO 1.8 STATE the two environmental concerns which canaffect the accuracy and reliability of temperaturedetection instrumentation.FunctionsofTemperatureDetectorsAlthough the temperatures that are monitored vary slightly depending on the details of facilitydesign, temperature detectors are used to provide three basic functions: indication, alarm, andcontrol. The temperatures monitored may normally be displayed in a central location, such asa control room, and may have audible and visual alarms associated with them when specifiedpreset limits are exceeded. These temperatures may have control functions associated with themso that equipment is started or stopped to support a given temperature condition or so that aprotective action occurs.DetectorProblemsIn the event that key temperature sensing instruments become inoperative, there are severalalternate methods that may be used. Some applications utilize installed spare temperaturedetectors or dual-element RTDs. The dual-element RTD has two sensing elements of which onlyone is normally connected. If the operating element becomes faulty, the second element may beused to provide temperature indication. If an installed spare is not utilized, a contact pyrometer(portable thermocouple) may be used to obtain temperature readings on those pieces of equipmentor systems that are accessible.IC-01 Page 8 Rev. 0
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