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AbstractAbstract
[en] By taking neutron importance function as a new base of evaluating the coupling magnitude, and by identifying the boundary of a constituent core by zeroes of the first spatial mode, a generalized relation between coupling coefficients and eigenvalue separation is derived. By this equality one can obtain a unified, consistent view in the treatment of a large single core whose two partial zones are loosely coupled, and that of a two-core system with the two physically separated. (Author)
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Francescon, S.; Pull, I.C.
United Kingdom Atomic Energy Authority, Reactor Group, Winfrith (United Kingdom)
United Kingdom Atomic Energy Authority, Reactor Group, Winfrith (United Kingdom)
AbstractAbstract
[en] A new theory of leakage in heterogeneous systems has recently been introduced in which the derivation of cell-averaged diffusion coefficients for use in whole reactor calculations is reduced to the calculation of a flux, ξ, arising from a tilted source in one lattice cell only. This report describes the manner which an existing transport theory computer programme was modified to calculate this new flux. It is concluded that the tilted flux is sensitive to boundary conditions. In particular, no generally satisfactory choice of boundary conditions in a cylindricalised cell has been found. (author)
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May 1964; 22 p; Also available from H.M. Stationery Office; Country of input: International Atomic Energy Agency (IAEA); 5 refs
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Report
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AbstractAbstract
No abstract available
Original Title
Usloviya ustojchivosti statsionarnogo rezhima svyazannykh reaktorov
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Letter-to-the editor; for English translation see the journal Sov. J. At. Energy.
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Atomnaya Ehnergiya; v. 35(5); p. 359-360
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AbstractAbstract
No abstract available
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18. annual American Nuclear Society conference; Las Vegas, Nev; 18 Jun 1972; Published in summary form only.
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Trans. Amer. Nucl. Soc; v. 15(1); p. 363
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AbstractAbstract
No abstract available
Original Title
K ustojchivosti ''v tselom'' yadernogo reaktora so svyazannymi aktivnymi zonami
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Deposited article; for English translation see the journal Sov. J. At. Energy.
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Atomnaya Ehnergiya; v. 39(1); p. 48
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AbstractAbstract
[en] An advanced method for heterogeneous reactor theory is presented including general formulation of 3 dimensional few-group heterogeneous reactor equation in dipolar approximation, its approximate difference form and method of calculation of heterogeneous reactor cell parameters. On the basis of this new approaches computer codes capable of solving 3 dimensional space and space-time problems for heterogeneous reactors with large number of channels were developed. Some numerical results were developed. Some numerical results of validations are presented. (author). 16 refs., 4 tabs
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Ronen, Y.; Elias, E. (eds.); Ben-Gurion Univ. of the Negev, Beersheba (Israel); 814 p; Jan 1994; p. 598-608; International conference on reactor physics and reactor computations; Tel Aviv (Israel); 23-26 Jan 1994
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No abstract available
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Letter-to-the-editor.
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Journal of Nuclear Science and Technology (Tokyo); v. 10(1); p. 64-66
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AbstractAbstract
[en] A method called area ratio method is derived for a symmetrical coupled-core system. The usefulness of this method is verified experimentally by comparison with the neutron source multiplication method and Farinelli and Pacilio's method. The proposed method is superior to the conventional methods in the respect that it does not need any reference point, and it is suitable for reactivity determination in the filed of nuclear criticality safety. (orig./HP)
[de]
Ein neues, Flaechenverhaeltnismethode genanntes Verfahren fuer ein symmetrisches System von zwei gekoppelten Kernen wird entwickelt. Experimentelle Vergleiche mit den Ergebnissen zweier eingefuehrter Methoden erweisen die Brauchbarkeit des neuen Verfahrens. Es ist den eingefuehrten Methoden insofern ueberlegen, als es keinen Referenzpunkt benoetigt. Fuer Anwendungen auf dem Gebiet der Kritikalitaetssicherheit ist das Verfahren geeignet. (orig./HP)Primary Subject
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[en] This paper describes an application of an approximate decoupling control to the noninteractive power regulation of each core in a coupled-core nuclear reactor model. A method for designing an approximate decoupling controller is presented here. This controller consists of an output feedback compensator and a precompensator which is introduced to diagonalize an open-loop frequency response matrix approximately in the frequency range important to reactor dynamics. A ''multipoint diagonalization method'' is adopted for the design of the precompensator. This method possesses some superiorities compared with the pseudo-diagonalization method. Digital simulations and graphical studies by the Gershgorin band demonstrate the usefulness of the multipoint diagonalization method as well as the effectiveness of the controller for power regulation
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IEEE Transactions on Nuclear Science; ISSN 0018-9499;
; v. 30(3); p. 1835-1842

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AbstractAbstract
[en] The simultaneous decoupling and control problem of multiple-core reactors is solved by using a state-variable feedback technique based on the Luenberger canonical state-space model. Two examples illustrate the theory
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Nuclear Science and Engineering; v. 62(3); p. 574-578
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