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Influence of impurities in Beryllium on tritium breeding ratio

Abstract

Several neutronics experiments simulating fusion blankets have been conducted with 14 MeV neutron source to assess the reliability of nuclear analysis codes. However, the analyses have not always presented good agreements so far between calculated and measured tritium production rates. One of the reasons was considered as impurities in beryllium which has negligibly small neutron absorption cross section in low energy range. Chemical compositions of beryllium were analyzed by Inductively Coupled Plasma (ICP) method, and a pulsed neutron decay experiment discovered that the macroscopic neutron absorption cross section for beryllium medium may be about 30% larger than the value calculated by the data specified by manufacturing company. The influence of the impurities on the calculations was studied on the basis of the fusion DEMO-reactor blanket design. As a result of the study, it was made clear that the impurities affect the local tritium production rates when the size of beryllium medium is more than 20-30 mean free paths (30-40 cm) in thickness. In case of some blanket designs that meet the above condition, the effect on tritium breeding ratio may become as large as about 4%. (author)
Authors:
Yamauchi, M; Ochiai, K; Verzilov, Y; Ito, M; Wada, M; Nishitani, T [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Mar 01, 2004
Product Type:
Conference
Report Number:
JAERI-Conf-2004-006
Resource Relation:
Conference: 6. IEA international workshop on beryllium technology for fusion, Miyazaki (Japan), 2-5 Dec 2003; Other Information: 15 refs., 7 figs., 5 tabs; PBD: Mar 2004; Related Information: In: Proceedings of the sixth IEA international workshop on beryllium technology for fusion, by Kawamura, Hiroshi (ed.) [Japan Atomic Energy Research Inst., Kashiwa, Chiba (Japan)]; Tanaka, Satoru (ed.) [Tokyo Univ., Tokyo (Japan)]; Ishitsuka, Etsuo (ed.) [Japan Atomic Energy Research Inst., Oarai, Ibaraki (Japan). Oarai Research Establishment], 366 pages.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BERYLLIUM; BERYLLIUM ALLOYS; BREEDING BLANKETS; D-T REACTORS; FERTILE MATERIALS; IMPURITIES; IRRADIATION; NEUTRONS; TRITIUM RECOVERY
OSTI ID:
20531386
Research Organizations:
Japan Atomic Energy Research Inst., Kashiwa, Chiba (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
TRN: JP0450426098041
Availability:
Available from INIS in electronic form; Also available from JAERI; URL: http://jolisf.tokai.jaeri.go.jp/pdf/conf/JAERI-Conf-2004-006.pdf
Submitting Site:
INIS
Size:
page(s) 163-171
Announcement Date:

Citation Formats

Yamauchi, M, Ochiai, K, Verzilov, Y, Ito, M, Wada, M, and Nishitani, T. Influence of impurities in Beryllium on tritium breeding ratio. Japan: N. p., 2004. Web.
Yamauchi, M, Ochiai, K, Verzilov, Y, Ito, M, Wada, M, & Nishitani, T. Influence of impurities in Beryllium on tritium breeding ratio. Japan.
Yamauchi, M, Ochiai, K, Verzilov, Y, Ito, M, Wada, M, and Nishitani, T. 2004. "Influence of impurities in Beryllium on tritium breeding ratio." Japan.
@misc{etde_20531386,
title = {Influence of impurities in Beryllium on tritium breeding ratio}
author = {Yamauchi, M, Ochiai, K, Verzilov, Y, Ito, M, Wada, M, and Nishitani, T}
abstractNote = {Several neutronics experiments simulating fusion blankets have been conducted with 14 MeV neutron source to assess the reliability of nuclear analysis codes. However, the analyses have not always presented good agreements so far between calculated and measured tritium production rates. One of the reasons was considered as impurities in beryllium which has negligibly small neutron absorption cross section in low energy range. Chemical compositions of beryllium were analyzed by Inductively Coupled Plasma (ICP) method, and a pulsed neutron decay experiment discovered that the macroscopic neutron absorption cross section for beryllium medium may be about 30% larger than the value calculated by the data specified by manufacturing company. The influence of the impurities on the calculations was studied on the basis of the fusion DEMO-reactor blanket design. As a result of the study, it was made clear that the impurities affect the local tritium production rates when the size of beryllium medium is more than 20-30 mean free paths (30-40 cm) in thickness. In case of some blanket designs that meet the above condition, the effect on tritium breeding ratio may become as large as about 4%. (author)}
place = {Japan}
year = {2004}
month = {Mar}
}