Conference Proceedings Paper
RESOLVING THE CONCERNS ABOUT THE DYNAMIC RESPONSES OF CANDU IN-CORE FLUX DETECTORS
33rd Annual CNS Conference - 2012 June 10-13
Jerry Cuttler (Cuttler & Associates Inc)
Harmeet Gill (Bruce Power)
Richard Scrannage (Bruce Power)
Philippe Paquette (Bruce Power)
CANDUs are determining the dynamic responses of flux detectors by a method open to question. It ignores relative changes in local flux conditions, which are significant during trips. Calculated prompt fractions (PFs) are widespread. The SIR detector development calculated the PF change with irradiation on a physical basis. Measurements were made over many years. The new results do not agree with the 1996 predictions. Some values are below the safety analysis limit. This has resulted in detector replacement, imposition of CPPF penalties on trip margins, additional safety analyses and other actions. This paper shows that such measurements are not required.
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