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Precision Limitations in the Measurement of Small Reactivity Changes

Edgar F. Bennett, Robert L. Long

Nuclear Science and Engineering

Volume 17 / Number 3 / November 1963 / Pages 425-432


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Expected errors in reactivity measurements made with a servo control are discussed and compared with observation. The influence upon measurement statistics of a residual spurious reactivity drift, of variable detector efficiency, and of servo control parameters is examined and compared with results using a thermal reactor at 72 watts. Power limited precision is shown to be obtainable with a servo control over a broad range of operating configurations and with good discrimination against incoherent residual reactivity drift.

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