Which one of the following will cause an upscale failure of a fission chamber neutron detector that is operating in the ion chamber region as a local power range monitor (LPRM)?
A. The detector electrode high voltage power supply output has decreased by 5 percent due to setpoint drift.
B. The detector chamber has become flooded with water due to leakage around the electrodes.
C. A power supply fuse in the amplifier circuit for the neutron monitoring instrument drawer has blown.
D. The uranium-235 in the detector coating has been transformed to uranium-236 by neutron absorption.
Show Answer
Answer: B
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