Kinetic Parameter β<sub>eff</sub>/ℓ Measurement on Low Enriched Uranyl Nitrate Solution with Single Unit Cores (600𝛗;, 280T, 800𝛗;)of STACY

Tonoike, Kotaro; Miyoshi, Y.; Kikuchi, T.; Yamamoto, Toshihiro

doi:10.1080/18811248.2002.9715315

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…Table 13 exhibits the difference in Rossi-alphas among MCNP6, RMC and experimental results (Nuclear Science Committee, 2010;Brookhaven National Laboratory, 1986;Tonoike et al, 2002). The experimental results are taken as the reference results for the test problems.…”

Section: Verification and Resultsmentioning

confidence: 99%

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Qiu

Wang

et al. 2017

Progress in Nuclear Energy

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a b s t r a c tIn this work, the capability of computing adjoint-weighted kinetic parameters, including effective delayed neutron fraction and neutron generation time, was implemented in the Reactor Monte Carlo (RMC) code based on the iterated fission probability (IFP) method. Three algorithms, namely, the NonOverlapping Blocks (NOB) algorithm, the Multiple Overlapping Blocks (MOB) algorithm and the superhistory algorithm, were implemented in RMC to investigate their accuracy, computational efficiency and estimation of variance. The algorithms and capability of computing kinetic parameters in RMC were verified and validated by comparison with MCNP6 as well as experimental results through a set of multigroup problems and continuous-energy problems.

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Section: Verification and Resultsmentioning

confidence: 99%

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Qiu

Wang

et al. 2017

Progress in Nuclear Energy

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“…The value measurement by the pulsed neutron source (PNS) method 10) was conducted for several known subcritical conditions, whose results were plotted in Fig. 6.…”

Section: Pulsed Neutron Source Methodsmentioning

confidence: 99%

Real Time a Value Measurement with Feynman-α Method Utilizing Time Series Data Acquisition on Low Enriched Uranium System

Tonoike

Yamamoto

Watanabe

et al. 2004

Journal of Nuclear Science and Technology

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As a part of the development of a subcriticality monitoring system, a system which has a time series data acquisition function for detector signals and a real time evaluation function of the value with the Feynman-method was established, with which the kinetic parameter ( value) was measured at the STACY heterogeneous core. Hashimoto's difference filter was implemented in the system, enabling the measurement in a critical condition. The measurement result of the new system agreed with the pulsed neutron method. The value was also evaluated by the newly developed algorithm of -mode calculations for the Monte Carlo method, which was compared with the experimental value. Those computational and experimental values show agreement within their uncertainties.

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“…When the least-squares fit of Equation (1) based on the one-point kinetics model to the count decay data is made, the fitted curve has a large deviation from these data and consequently the fitting underestimates the fundamental prompt-neutron decay constant α 0 . This difficulty has been frequently overcome by a successful technique where count decay data acquired in the above short time range were masked to exclude the effects of the higher mode [15,22]. In this study, their technique referred to as the mask technique was applied.…”

Section: Pulsed Neutron Experimentsmentioning

confidence: 99%

Measurement of large negative reactivity of an accelerator-driven system in the Kyoto University Critical Assembly

Sakon

Hashimoto

Maarof

et al. 2013

Journal of Nuclear Science and Technology

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Large negative reactivity of a subcritical system driven by a pulsed 14 MeV neutron source has been measured in the Kyoto University Critical Assembly. The subcriticality of the accelerator-driven system (ADS) ranged in effective multiplication factor roughly from 0.98 to 0.92, which corresponded to an operational range of an actual ADS proposed by Japan Atomic Energy Agency. As the measurement technique, pulsed neutron method, power spectral analysis for pulsed neutron source, accelerator-beam trip method were employed. From neutron count decay data obtained by the pulsed neutron experiment, not only the promptneutron decay constant of fundamental mode but also a higher spatial mode could be derived. The subcriticality was also determined from the fundamental decay constant. The measured cross-power spectral density consisted of a familiar correlated reactor-noise component and many uncorrelated delta-functionlike peaks at the integral multiple of pulse repetition frequency. The fundamental prompt-neutron decay constant, i.e., the subcriticality determined from the latter uncorrelated peaks was consistent with that obtained by the above pulsed neutron experiment. However, the magnitude of the former correlated component was reduced with an increase in the subcriticality and eventually this component became almost white at deeply subcritical state ranging in the multiplication factor under 0.95. Consequently, the determination of the decay constant from the correlated component was impossible under such a subcritical state. As data analysis method for the beam trip experiment, both the conventional integral count method and the least-squares inverse kinetics method (LSIKM) were employed. The LSIKM analysis led to the consistent subcriticality with that obtained by the pulsed neutron experiment, while the integral count method significantly underestimated the subcriticality. This underestimation originated from a residual background count, which was maintained after the beam trip. The LSIKM was mostly not influenced by such a slight count rate.

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Kinetic Parameter β_eff/ℓ Measurement on Low Enriched Uranyl Nitrate Solution with Single Unit Cores (600𝛗;, 280T, 800𝛗;)of STACY

Cited by 17 publications

References 6 publications

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Real Time a Value Measurement with Feynman-α Method Utilizing Time Series Data Acquisition on Low Enriched Uranium System

Measurement of large negative reactivity of an accelerator-driven system in the Kyoto University Critical Assembly

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Kinetic Parameter βeff/ℓ Measurement on Low Enriched Uranyl Nitrate Solution with Single Unit Cores (600𝛗;, 280T, 800𝛗;)of STACY

Cited by 17 publications

References 6 publications

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Calculation of adjoint-weighted kinetic parameters with the reactor Monte Carlo code RMC

Real Time a Value Measurement with Feynman-α Method Utilizing Time Series Data Acquisition on Low Enriched Uranium System

Measurement of large negative reactivity of an accelerator-driven system in the Kyoto University Critical Assembly

Contact Info

Product

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Kinetic Parameter β_eff/ℓ Measurement on Low Enriched Uranyl Nitrate Solution with Single Unit Cores (600𝛗;, 280T, 800𝛗;)of STACY