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Effects of UO{sub 2}-fuel grain size on reactivity. Study by ultra-fine energy group calculations using the computer codes based on the collision probability method

Technical Report:

Abstract

Heterogeneity effects of powdered or slurry fuel is studied through reactivity calculations of tiny cells consisting of a small fuel lump surrounded by water. The kind of fuel is slightly-enriched uranium dioxide which is immersed in water. The cells are made smaller keeping constant the volume ratio of water to fuel; the homogeneous system is regarded as the limit of grain size 0. Reaction rates are calculated by solving the ultra-fine energy group transport equations by the collision probability method. The collision probabilities are calculated using the extended version of the RABBLE code for the fast energy groups and that of the THERMOS code for the thermal energy groups as applicable to spherical cells. The infinite-medium multiplication factor and its four-factors, and their fractional changes from the homogeneous system are obtained. The results of calculations show that substitution of homogeneous system for heterogeneous ones underestimates the reactivity some 2% for as small as 2-mm-diam. fuel elements, and this underestimation mainly comes from the change of the resonance escape probability. (author).
Authors:
Okuno, Hiroshi; [1]  Okuda, Yasuhisa
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Aug 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-107
Reference Number:
SCA: 220300; 050700; PA: JPN-91:012094; SN: 92000659128
Resource Relation:
Other Information: PBD: Aug 1991
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; URANIUM DIOXIDE; REACTIVITY; FUEL CELLS; HETEROGENEOUS EFFECTS; COLLISIONS; WATER; PARTICLE SIZE; RESONANCE ESCAPE PROBABILITY; R CODES; T CODES; CRITICALITY; FUEL RODS; MULTIPLICATION FACTORS; 220300; 050700; FUEL ELEMENTS; FUELS PRODUCTION AND PROPERTIES
OSTI ID:
10117374
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92768016; TRN: JP9112094
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
54 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Okuno, Hiroshi, and Okuda, Yasuhisa. Effects of UO{sub 2}-fuel grain size on reactivity. Study by ultra-fine energy group calculations using the computer codes based on the collision probability method. Japan: N. p., 1991. Web.
Okuno, Hiroshi, & Okuda, Yasuhisa. Effects of UO{sub 2}-fuel grain size on reactivity. Study by ultra-fine energy group calculations using the computer codes based on the collision probability method. Japan.
Okuno, Hiroshi, and Okuda, Yasuhisa. 1991. "Effects of UO{sub 2}-fuel grain size on reactivity. Study by ultra-fine energy group calculations using the computer codes based on the collision probability method." Japan.
@misc{etde_10117374,
title = {Effects of UO{sub 2}-fuel grain size on reactivity. Study by ultra-fine energy group calculations using the computer codes based on the collision probability method}
author = {Okuno, Hiroshi, and Okuda, Yasuhisa}
abstractNote = {Heterogeneity effects of powdered or slurry fuel is studied through reactivity calculations of tiny cells consisting of a small fuel lump surrounded by water. The kind of fuel is slightly-enriched uranium dioxide which is immersed in water. The cells are made smaller keeping constant the volume ratio of water to fuel; the homogeneous system is regarded as the limit of grain size 0. Reaction rates are calculated by solving the ultra-fine energy group transport equations by the collision probability method. The collision probabilities are calculated using the extended version of the RABBLE code for the fast energy groups and that of the THERMOS code for the thermal energy groups as applicable to spherical cells. The infinite-medium multiplication factor and its four-factors, and their fractional changes from the homogeneous system are obtained. The results of calculations show that substitution of homogeneous system for heterogeneous ones underestimates the reactivity some 2% for as small as 2-mm-diam. fuel elements, and this underestimation mainly comes from the change of the resonance escape probability. (author).}
place = {Japan}
year = {1991}
month = {Aug}
}