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Prompt neutron decay constantin a critical state is useful information to validate the numerically predicted ratio of the point kinetics parameters, whereandare the effective delayed neutron fraction and prompt neutron lifetime, respectively. To directly measurein a target critical system, this study proposes the application of the dynamic mode decomposition (DMD) to the reactor noise analysis based on the Rossi-method. The DMD-based Rossi-method enables us to robustly estimate the fundamental mode component offrom the Rossi-histograms measured using multiple neutron detectors. Furthermore, the file-by-file moving block bootstrap method is newly proposed for the statistical uncertainty quantification ofto prevent huge memory usage when the neutron count rate is high and/or the total measurement time is long. A critical experiment has been conducted at Kyoto University Critical Assembly to demonstrate the proposed method. As a result, the proposed method can uniquely determine thevalue of which the statistical uncertainty is smallest. By utilizing this experimental result of, numerical results ofratio using the continuous energy Monte Carlo code MCNP6.2 with recent nuclear data libraries, which are processed by the nuclear data processing code FRENDY, are validated.

Application of dynamic mode decomposition to Rossi-α method in a critical state using file-by-file moving block bootstrap method