[1C11-16] Experiment Analysis

4:20 PM - 4:35 PM JST(7:20 AM - 7:35 AM UTC)

[1C14] Subcriticality Estimation Using Autocovariance of Reactor Noise(1) Least Squares Fitting Using Delayed Neutron Components

*Tomohiro Endo¹, Ryoga Hirota¹, Akio Yamamoto¹, Kenichi Watanabe², Genichiro Wakabayashi³, Kengo Oda⁴, Junichi H. Kaneko⁴ (1. Nagoya Univ., 2. Kyushu Univ., 3. Kindai Univ., 4. Hokkaido Univ.)

Keywords:

subcriticality,reactor noise,autocovariance,delayed neutron,least squares fitting

A theoretical formula for the lag-1 autocovariance of zero-power reactor noise is derived by considering delayed neutron components. Using the least squares fitting to the measured variation of the lag-1 autocovariance with respect to the counting gate width, we investigate whether subcriticality in dollar units can be estimated without prior knowledge of point kinetics parameters.