A Review of the Dynamic Response of Self- Powered Flux Detectors in CANDU Reactors

Abstract

Self-powered flux detectors are used extensively in CANDU reactors for flux-mapping, control,and safety. In these applications, particularly the latter, it is important to take into account the dynamic response of the detectors. The transfer functions of the detectors used in the Bruce A, 600 MW, and Bruce B reactors have been measured, on several occasions. The available data, including data on delayed reactor gamma-rays which largely determine the delayed response of platinum and Pt-clad Inconel detectors, is reviewed. The effect of burn-up on the latter detectors is discussed. Methods of optimizing the response are presented.