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Effect of nonuniform concentration profile of plutonium in mixer settlers on criticality of the Purex process

Technical Report:

Abstract

In the Purex solvent extraction process, change of process conditions, such as a decrease of solvent flowrate, causes an accumulation of Pu(IV) in a mixer settler bank. When the concentration of Pu(IV) exceeds a certain concentration limit in the organic phase, a heavy organic phase, the third phase, forms. These phenomena, the accumulation and the third phase formation, remarkably affect concentration profile of Pu, liquid-liquid interfacial level of mixer settlers and composition of the solvent. In the present study, some parameters which influence the criticality, k{sub eff}, were examined. Effects of matrix solvent, concentration profile of Pu, interfacial levels and TBP content in the organic solvent on the k{sub eff} value were examined by the Monte Carlo Code MULTI-KENO with MGCL 26 and 137 groups of constants library made from ENDF/B-IV. The result of the analysis showed that the differences of k{sub eff} value between the organic and the aqueous solutions were as small as approx. 1%, and the accumulation of Pu in a central part of system caused higher K{sub eff} value, and TBP content higher than 30% in the organic solvent showed lower k{sub eff} value than that of 30% TBP solvent. (author).
Authors:
Ami, Norio; Miyoshi, Yoshinori; Tachimori, Shoichi [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Nov 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-184
Reference Number:
SCA: 050800; 400105; PA: JPN-91:012230; SN: 92000659264
Resource Relation:
Other Information: PBD: Nov 1991
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PLUTONIUM COMPOUNDS; CRITICALITY; MIXER-SETTLERS; PUREX PROCESS; SOLVENT EXTRACTION; TBP; DODECANE; AQUEOUS SOLUTIONS; NITRIC ACID; QUANTITY RATIO; COMPUTER CALCULATIONS; K CODES; MULTI-PARAMETER ANALYSIS; MULTIPLICATION FACTORS; MASS DISTRIBUTION; FLOW RATE; 050800; 400105; SPENT FUELS REPROCESSING; SEPARATION PROCEDURES
OSTI ID:
10117144
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92768152; TRN: JP9112230
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
37 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ami, Norio, Miyoshi, Yoshinori, and Tachimori, Shoichi. Effect of nonuniform concentration profile of plutonium in mixer settlers on criticality of the Purex process. Japan: N. p., 1991. Web.
Ami, Norio, Miyoshi, Yoshinori, & Tachimori, Shoichi. Effect of nonuniform concentration profile of plutonium in mixer settlers on criticality of the Purex process. Japan.
Ami, Norio, Miyoshi, Yoshinori, and Tachimori, Shoichi. 1991. "Effect of nonuniform concentration profile of plutonium in mixer settlers on criticality of the Purex process." Japan.
@misc{etde_10117144,
title = {Effect of nonuniform concentration profile of plutonium in mixer settlers on criticality of the Purex process}
author = {Ami, Norio, Miyoshi, Yoshinori, and Tachimori, Shoichi}
abstractNote = {In the Purex solvent extraction process, change of process conditions, such as a decrease of solvent flowrate, causes an accumulation of Pu(IV) in a mixer settler bank. When the concentration of Pu(IV) exceeds a certain concentration limit in the organic phase, a heavy organic phase, the third phase, forms. These phenomena, the accumulation and the third phase formation, remarkably affect concentration profile of Pu, liquid-liquid interfacial level of mixer settlers and composition of the solvent. In the present study, some parameters which influence the criticality, k{sub eff}, were examined. Effects of matrix solvent, concentration profile of Pu, interfacial levels and TBP content in the organic solvent on the k{sub eff} value were examined by the Monte Carlo Code MULTI-KENO with MGCL 26 and 137 groups of constants library made from ENDF/B-IV. The result of the analysis showed that the differences of k{sub eff} value between the organic and the aqueous solutions were as small as approx. 1%, and the accumulation of Pu in a central part of system caused higher K{sub eff} value, and TBP content higher than 30% in the organic solvent showed lower k{sub eff} value than that of 30% TBP solvent. (author).}
place = {Japan}
year = {1991}
month = {Nov}
}