You need JavaScript to view this

Effects of UO{sub 2}-fuel grain size on reactivity. Continuous energy Monte Carlo calculations

Technical Report:

Abstract

Heterogeneity effects on reactivity of powdered or slurry fuel were studied through criticality calculations of three-dimensional tiny cells, which were infinitely arrayed and consisted of a spherical fuel pellet of 5 wt% {sup 235}U-enriched uranium dioxide surrounded by water; the diameter of the fuel pellet was varied from 0 (homogeneous) to 6 mm, keeping constant the volume ratio of water to fuel. Reaction rates were calculated by solving the continuous energy transport equations by the Monte Carlo method. The infinite-medium multiplication factor and its four-factors, and their fractional changes from the homogeneous system were obtained. The infinite-medium multiplication factor increased when the system changed from homogeneous to heterogeneous. The results of calculations confirmed that the reactivity increase mainly came from the resonance escape probability p; they also indicated that any uranium-fuel system of grain size less than 100 {mu}m could be treated homogeneous if a 0.3 % increment of reactivity was regarded small enough to be negligible. (author).
Authors:
Sakurai, Yoshinori; [1]  Okuno, Hiroshi; Naito, Yoshitaka
  1. Kyoto Univ. (Japan)
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-137
Reference Number:
SCA: 220300; 050700; PA: JPN-91:012095; SN: 92000659129
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; FUEL CELLS; REACTIVITY; URANIUM DIOXIDE; MONTE CARLO METHOD; HETEROGENEOUS EFFECTS; WATER; MULTIPLICATION FACTORS; RESONANCE ESCAPE PROBABILITY; PARTICLE SIZE; CRITICALITY; 220300; 050700; FUEL ELEMENTS; FUELS PRODUCTION AND PROPERTIES
OSTI ID:
10117378
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92768017; TRN: JP9112095
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
40 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Sakurai, Yoshinori, Okuno, Hiroshi, and Naito, Yoshitaka. Effects of UO{sub 2}-fuel grain size on reactivity. Continuous energy Monte Carlo calculations. Japan: N. p., 1991. Web.
Sakurai, Yoshinori, Okuno, Hiroshi, & Naito, Yoshitaka. Effects of UO{sub 2}-fuel grain size on reactivity. Continuous energy Monte Carlo calculations. Japan.
Sakurai, Yoshinori, Okuno, Hiroshi, and Naito, Yoshitaka. 1991. "Effects of UO{sub 2}-fuel grain size on reactivity. Continuous energy Monte Carlo calculations." Japan.
@misc{etde_10117378,
title = {Effects of UO{sub 2}-fuel grain size on reactivity. Continuous energy Monte Carlo calculations}
author = {Sakurai, Yoshinori, Okuno, Hiroshi, and Naito, Yoshitaka}
abstractNote = {Heterogeneity effects on reactivity of powdered or slurry fuel were studied through criticality calculations of three-dimensional tiny cells, which were infinitely arrayed and consisted of a spherical fuel pellet of 5 wt% {sup 235}U-enriched uranium dioxide surrounded by water; the diameter of the fuel pellet was varied from 0 (homogeneous) to 6 mm, keeping constant the volume ratio of water to fuel. Reaction rates were calculated by solving the continuous energy transport equations by the Monte Carlo method. The infinite-medium multiplication factor and its four-factors, and their fractional changes from the homogeneous system were obtained. The infinite-medium multiplication factor increased when the system changed from homogeneous to heterogeneous. The results of calculations confirmed that the reactivity increase mainly came from the resonance escape probability p; they also indicated that any uranium-fuel system of grain size less than 100 {mu}m could be treated homogeneous if a 0.3 % increment of reactivity was regarded small enough to be negligible. (author).}
place = {Japan}
year = {1991}
month = {Sep}
}