You need JavaScript to view this

Theoretical methods for determination of core parameters in uranium-plutonium lattices

Abstract

The prediction of plutonium production in power reactors depends essentially on how the change of neutron energy spectra in a reactor cell during burn-up is determined. In the epithermal region, where the build-up of plutonium occurs, the slowing down effects are particularly important, whereas, on the other hand, the thermal neutron spectrum is strongly influenced by the low-lying plutonium resonances. For accurate analysis, multi-group numerical methods are required, which, applied to burn-up prediction, are extremely laborious and time consuming even for large computers. This paper contains a comprehensive review of the methods of core parameter determination in the uranium-plutonium lattices developed in Yugoslavia during the last few years. Faced with the problem of using small computers, the authors had to find new approaches combining physical evidence and mathematical elegance. The main feature of these approaches is the tendency to proceed with analytical treatment as far as possible and then to include suitable numerical improvements. With this philosophy, which is generally overlooked when using large computers, fast and reasonably accurate methods were developed. The methods include original means for adequate treatment of neutron spectra and cell geometry effects,especially suitable for U-Pu systems. In particular, procedures based on the energy dependent boundary  More>>
Authors:
Pop-Jordanov, J.; Bosevski, T.; Matausek, M.; Stefanovic, D.; Strugar, P. [1] 
  1. Institut za Nuklearne Nauke Boris Kidric, Belgrade (Yugoslavia)
Publication Date:
Jul 01, 1972
Product Type:
Conference
Report Number:
INIS-RS-1004/A; A/CONF.49/P-351
Resource Relation:
Conference: 4. United Nations international conference on the peaceful uses of atomic energy, Peaceful uses of atomic energy. Proceedings of the fourth international conference, jointly sponsored by the UN and the IAEA and held in Geneva, 6-16 September 1971. Vol. 9. Isotope enrichment. Fuel cycles. Safeguards. Vienna. IAEA/UN. 1972. 15 v., Geneva (Switzerland), 6 Sep 1971; Other Information: 29 refs., 14 figs., This record replaces 3023963; This record replaces 38115379
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BURNUP; C CODES; CALCULATION METHODS; COLLISION PROBABILITY METHOD; FAST NEUTRONS; GREEN FUNCTION; NEUTRON FLUX; NEUTRON SPECTRA; P CODES; PLUTONIUM; REACTOR CORES; REACTOR LATTICE PARAMETERS; REACTOR LATTICES; RESONANCE NEUTRONS; SLOWING-DOWN KERNELS; URANIUM
OSTI ID:
21239846
Country of Origin:
Serbia
Language:
English
Other Identifying Numbers:
TRN: RS07RB198115379
Availability:
Available from INIS in electronic form. Also available from the Institute of Nuclear Sciences VINCA
Submitting Site:
INIS
Size:
16 page(s)
Announcement Date:
Dec 08, 2009

Citation Formats

Pop-Jordanov, J., Bosevski, T., Matausek, M., Stefanovic, D., and Strugar, P. Theoretical methods for determination of core parameters in uranium-plutonium lattices. Serbia: N. p., 1972. Web.
Pop-Jordanov, J., Bosevski, T., Matausek, M., Stefanovic, D., & Strugar, P. Theoretical methods for determination of core parameters in uranium-plutonium lattices. Serbia.
Pop-Jordanov, J., Bosevski, T., Matausek, M., Stefanovic, D., and Strugar, P. 1972. "Theoretical methods for determination of core parameters in uranium-plutonium lattices." Serbia.
@misc{etde_21239846,
title = {Theoretical methods for determination of core parameters in uranium-plutonium lattices}
author = {Pop-Jordanov, J., Bosevski, T., Matausek, M., Stefanovic, D., and Strugar, P.}
abstractNote = {The prediction of plutonium production in power reactors depends essentially on how the change of neutron energy spectra in a reactor cell during burn-up is determined. In the epithermal region, where the build-up of plutonium occurs, the slowing down effects are particularly important, whereas, on the other hand, the thermal neutron spectrum is strongly influenced by the low-lying plutonium resonances. For accurate analysis, multi-group numerical methods are required, which, applied to burn-up prediction, are extremely laborious and time consuming even for large computers. This paper contains a comprehensive review of the methods of core parameter determination in the uranium-plutonium lattices developed in Yugoslavia during the last few years. Faced with the problem of using small computers, the authors had to find new approaches combining physical evidence and mathematical elegance. The main feature of these approaches is the tendency to proceed with analytical treatment as far as possible and then to include suitable numerical improvements. With this philosophy, which is generally overlooked when using large computers, fast and reasonably accurate methods were developed. The methods include original means for adequate treatment of neutron spectra and cell geometry effects,especially suitable for U-Pu systems. In particular, procedures based on the energy dependent boundary conditions, the discrete energy representation, the improved collision probabilities and the Green function slowing down solutions were developed and applied. Results obtained with these methods are presented and compared with those of the experiments and those obtained with other methods. (author)}
place = {Serbia}
year = {1972}
month = {Jul}
}