Noise and Transient Kinetics Experiments and Calculations for Loosely Coupled Cores

Rydin, R.A.; Burke, J. A.; Moore, W. E. C.; Seemann, K.

doi:10.13182/nse71-a22352

Cited by 22 publications

(4 citation statements)

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“…This expression was derived from the formulation of Rydin et al (11) In this study, we measured the reaction rate distributions using gold wires to obtain the flux-tilt value. With the assumption that the flux change by the perturbation is independent on the neutron energy, the perturbed flux p' in Eq .…”

Section: Application Of the Ehp Methods To An Axially Decoupled Corementioning

confidence: 99%

Measurement of Flux Tilt and Eigenvalue Separation in Axially Decoupled Core.

Andoh

Misawa

Nishina

et al. 1997

J. Nucl. Sci. Technol.

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A study on the nuclear characteristics of an axially decoupled core was performed through a series of experiments using the solid moderator core in the Kyoto University Critical Assembly (KUCA). In the axially decoupled core which has an internal blanket between the upper and lower cores, the measured differential reactivity worth of a control rod moving axially was apparently asymmetric between the two core regions. Since it was considered that this phenomenon was attributed to the neutron flux tilt caused by the axial movement of control rods during the measurement of differential worth, the axial reaction rate distributions were measured by gold wires with and without a cadmium tube. It was found that the reaction rate distribution was remarkably tilted by changing the pattern of control rods inserted in the core to maintain the critical state, and that the flux distribution was tilted without energy dependency. The value of first-order eigenvalue separation was obtained using the relation between the neutron flux tilt and the first-mode eigenvalue separation based on the Explicit Higher-order Perturbation (EHP) method. This value agreed with the calculated result by the SRAC system.

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Section: Application Of the Ehp Methods To An Axially Decoupled Corementioning

confidence: 99%

Measurement of Flux Tilt and Eigenvalue Separation in Axially Decoupled Core.

Andoh

Misawa

Nishina

et al. 1997

J. Nucl. Sci. Technol.

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“…Here, by using the perturbed flux 0 g 0 , one can define the following equation of the flux tilt ( 1þ2 in two-energy-group model, which is the extension to the two-energy-group version from the ordinary formulation of the flux tilt in one-energy-group model defined by Rydin et al, 1) and it includes the effects of the neutron energy dependence:…”

Section: Formulationmentioning

confidence: 99%

“…The flux tilt is defined as a degree of distortion in the shape of neutron flux distribution. The relationship between the flux tilt in one-energy-group model and the first-mode eigenvalue separation was first presented by Rydin et al, 1) under an assumption that all higher-mode components excluding the first-mode one were neglected on the basis of the first-order perturbation theory. By using this relationship, the firstmode eigenvalue separation can be easily inferred from the degree of flux tilt in one-energy-group model when the perturbed reactivity is known.…”

Section: Introductionmentioning

confidence: 99%

“…In the KUCA B-core experiment, 14) which is a polyethylene solid-moderated core, it has been shown that the change in the neutron flux distribution is independent of neutron energy, by measuring reaction rate distributions of gold and Cd-covered wires activated. However, in not only the KUCA B-core experiment but also other ones, 1,[16][17][18][19][20][21] theoretical formulation of the relationship utilized is derived from the Explicit Higher-Order perturbation method (the EHP method) 15) with one-energy-group approximation.…”

Section: Introductionmentioning

confidence: 99%

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Experiments and Analyses for Relationship between Flux Tilt in Two-Energy-Group Model and First-Mode Eigenvalue Separation

Pyeon

Misawa

Unesaki

et al. 2004

Journal of Nuclear Science and Technology

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For a relationship between the flux tilt in two-energy-group model and the first-mode eigenvalue separation, it was found that the flux tilt in two-energy-group model is proportional to the perturbed reactivity and inversely proportional to the first-mode eigenvalue separation on the basis of the Modified Explicit Higher Order Perturbation method with two-energy-group approximation, by taking account of only the first-order perturbation and the first-mode expansion approximations. As a result, one could obtain the same formulation of the flux tilt in one-energy-group model based on a conventional higher-order perturbation theory with one-energy-group approximation. To show the validity of this relationship, flux tilt experiments were carried out by using a coupled-core at the Kyoto University Critical Assembly, and analyses of the experiments were performed for inferring the first-mode eigenvalue separation from both the perturbed reactivity and the degree of flux tilt induced by a perturbation. Through the comparison between the analyses and the experiments, the validity of the relationship derived was demonstrated, and it was concluded that the flux tilt is independent of the neutron energy.

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Studies of neutronic coupling by reactor noise analysis in the time domain for facilities of RCN, Petten

Türkcan

Dragt

1975

Annals of Nuclear Energy

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Noise and Transient Kinetics Experiments and Calculations for Loosely Coupled Cores

Cited by 22 publications

References 0 publications

Measurement of Flux Tilt and Eigenvalue Separation in Axially Decoupled Core.

Measurement of Flux Tilt and Eigenvalue Separation in Axially Decoupled Core.

Experiments and Analyses for Relationship between Flux Tilt in Two-Energy-Group Model and First-Mode Eigenvalue Separation

Studies of neutronic coupling by reactor noise analysis in the time domain for facilities of RCN, Petten

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