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Measurements of breakaway reaction between beryllium and water vapor for ITER blanket design

Technical Report:

Abstract

Beryllium will be utilized as the neutron multiplier in the ITER breeding blanket. As part of Japanese contribution of the water-cooled blanket design, preliminary study was performed to investigate beryllium breakaway reaction, which is one of safety issues of ITER under high temperature conditions. Thermogravimetric measurements in the temperature range 550 - 750 degC were carried out under helium gas flow containing water vapor of 7.6 and 0.76 Torr. The test samples were prepared from commercially available hot-pressed and hot-rolled beryllium plates. Characterization of the surface reaction product was performed by macro and microscopic observations, and X-ray diffraction analysis. Linear and parabolic rate laws were found for the dominant reaction steps in the preceding period of the breakaway reaction. Microstructure of the surface reaction layer formed in all exposure conditions revealed brittle structure, which was composed of blister and microcracks. The rate equations were obtained for the preceding step of breakaway reaction. (J.P.N.).
Authors:
Yoshida, Hiroshi; Enoeda, Mikio; [1]  Ashibe, Kusuo; Ono, Kiyoshi
  1. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
Publication Date:
Jun 01, 1992
Product Type:
Technical Report
Report Number:
JAERI-M-92-083
Reference Number:
SCA: 700450; 700480; PA: JPN-92:011191; SN: 93000918596
Resource Relation:
Other Information: PBD: Jun 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER TOKAMAK; BREEDING BLANKETS; BERYLLIUM; WATER VAPOR; CHEMICAL REACTION KINETICS; TEMPERATURE RANGE 0400-1000 K; 700450; 700480; BLANKETS AND COOLING SYSTEMS; COMPONENT DEVELOPMENT; MATERIALS STUDIES
OSTI ID:
10111212
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753270; TRN: JP9211191
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
35 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Yoshida, Hiroshi, Enoeda, Mikio, Ashibe, Kusuo, and Ono, Kiyoshi. Measurements of breakaway reaction between beryllium and water vapor for ITER blanket design. Japan: N. p., 1992. Web.
Yoshida, Hiroshi, Enoeda, Mikio, Ashibe, Kusuo, & Ono, Kiyoshi. Measurements of breakaway reaction between beryllium and water vapor for ITER blanket design. Japan.
Yoshida, Hiroshi, Enoeda, Mikio, Ashibe, Kusuo, and Ono, Kiyoshi. 1992. "Measurements of breakaway reaction between beryllium and water vapor for ITER blanket design." Japan.
@misc{etde_10111212,
title = {Measurements of breakaway reaction between beryllium and water vapor for ITER blanket design}
author = {Yoshida, Hiroshi, Enoeda, Mikio, Ashibe, Kusuo, and Ono, Kiyoshi}
abstractNote = {Beryllium will be utilized as the neutron multiplier in the ITER breeding blanket. As part of Japanese contribution of the water-cooled blanket design, preliminary study was performed to investigate beryllium breakaway reaction, which is one of safety issues of ITER under high temperature conditions. Thermogravimetric measurements in the temperature range 550 - 750 degC were carried out under helium gas flow containing water vapor of 7.6 and 0.76 Torr. The test samples were prepared from commercially available hot-pressed and hot-rolled beryllium plates. Characterization of the surface reaction product was performed by macro and microscopic observations, and X-ray diffraction analysis. Linear and parabolic rate laws were found for the dominant reaction steps in the preceding period of the breakaway reaction. Microstructure of the surface reaction layer formed in all exposure conditions revealed brittle structure, which was composed of blister and microcracks. The rate equations were obtained for the preceding step of breakaway reaction. (J.P.N.).}
place = {Japan}
year = {1992}
month = {Jun}
}