Subcriticality estimation by extended Kalman filter technique in transient experiment with external neutron source at Kyoto University Critical Assembly

Yamanaka, Masao; Watanabe, K.; Pyeon, Cheol Ho

doi:10.1140/epjp/s13360-020-00270-6

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Transient experiments [22] were carried out in the uranium-polyethylene (EE1) core at KUCA shown in Fig. A4.1.…”

Section: Critical Corementioning

confidence: 99%

“…3.16 Comparison of subcriticality monitoring between the inverse method and the EKF technique in ADS transient experiment (Ref. [22]) future studies, the modeling of the space-state equation has to be modified on the basis of S eff and detection efficiency.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…3.1c-f; neutron-guided core with beam window: Cases 3, 4, 5, and 6, respectively). Numerals 12,20,22,26, and 24 correspond to fuel plates in the partial assembly/ies used to reach criticality ( Fig. 3.1a-f, respectively).…”

mentioning

confidence: 99%

“…. The estimate by the EKF technique of the neutron counts showed Neutron count rate distribution during C1 drop transient with external neutron source (Ref [22]…”

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confidence: 99%

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Reactor Kinetics

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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In static and kinetic experimental analyses, the reactivity effect of introducing a neutron guide has been examined with various materials and adjustments of the beam window. With the objective of improving the KUCA core characteristics, the implementation of the neutron guide is predicted to increase the fast neutrons in directing the fuel region. With regard to the kinetic characteristics, the subcriticality and the prompt neutron decay constant are monitored for several core configurations and detector positions. The KUCA core is equipped to make locally a hard spectrum core region with the combined use of 235U fuel, a polyethylene moderator, and a Pb–Bi reflector for criticality. In this study, the first attempt is made to examine experimentally the characteristics of kinetics parameters in ADS comprised of 235U-fueled and Pb–Bi-zoned core, and spallation neutrons generated by an injection of 100 MeV protons onto the solid Pb–Bi target. Online monitoring of reactivity has been deduced in real time by the inverse kinetic method on the basis of the one-point kinetic equation with measured neutron signals in the core. Here, measurements by the one-point kinetic equation are validated through the subcriticality evaluation with the PNS histogram and the methodology by the inhour equation.

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“…Transient experiments [22] were carried out in the uranium-polyethylene (EE1) core at KUCA shown in Fig. A4.1.…”

Section: Critical Corementioning

confidence: 99%

Section: Performance Evaluationmentioning

confidence: 99%

mentioning

confidence: 99%

“…. The estimate by the EKF technique of the neutron counts showed Neutron count rate distribution during C1 drop transient with external neutron source (Ref [22]…”

mentioning

confidence: 99%

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Reactor Kinetics

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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“…Another paper [2] examining how to qualify a sub-critical system using specific filtering techniques of experimental data is useful to introduce the fundamental distinction between a critical assembly (a reactor), which is in an unstable, but controllable, quasi steady-state, and a sub-critical facility (Fig. 1), which instead is kept stable by an external source of neutrons (some more papers concerning more specifically the design of such facilities are quoted in the last subsection).…”

Section: Mathematical Modelsmentioning

confidence: 99%

Advances in the physics and thermohydraulics of nuclear reactors

et al. 2021

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Introduction

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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At the Kyoto University Critical Assembly (KUCA), the accelerator-driven system (ADS) is composed of a solid-moderated and solid-reflected core (A-core) and a pulsed-neutron generator (14 MeV neutrons) or the fixed-filed alternating gradient (FFAG) accelerator (100 MeV protons). At KUCA, two external neutron sources, including 14 MeV neutrons and 100 MeV protons, are separately injected into the A-core, and employed for carrying out the ADS experiments. With the combined use of the A-core and two external neutron sources, basic and feasibility studies of ADS have been engaged in the examination of neutronics of ADS, through the measurements of statics and kinetics parameters of reactor physics, including subcritical multiplication factor, subcriticality, prompt neutron decay constant, effective delayed neutron fraction, neutron spectrum, and reaction rates.

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Subcriticality estimation by extended Kalman filter technique in transient experiment with external neutron source at Kyoto University Critical Assembly

Cited by 4 publications

References 14 publications

Reactor Kinetics

Reactor Kinetics

Advances in the physics and thermohydraulics of nuclear reactors

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