Refer to the drawing of a differential pressure (D/P) level detection system for a reactor vessel at normal operating temperature and pressure (see figure below).
A nuclear power plant uses several differential pressure detectors like the one below to provide multiple channels of reactor vessel water level indication.
A hot channel was calibrated when the reactor vessel was at normal operating temperature.
A cold channel was calibrated when the reactor vessel was at 160°F.
How will the level indications on the two channels compare when the reactor vessel is at 160°F?
A. The cold channel will indicate higher than the hot channel, due to the difference in reference leg water density at the two calibration temperatures.
B. The cold channel will indicate lower than the hot channel, due to the difference in reference leg water density at the two calibration temperatures.
C. The cold channel will indicate higher than the hot channel, due to the difference in reactor vessel water density at the two calibration temperatures.
D. The cold channel will indicate lower than the hot channel, due to the difference in reactor vessel water density at the two calibration temperatures.
Show Answer
Answer:D
Share your understanding of this question with the correct explanation.