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Onizawa, Kunio; Suzuki, Masahide
JSME International Journal, Series A, 47(3), p.479 - 485, 2004/07
In the structural integrity assessment of reactor pressure vessel, fracture toughness values are estimated by assuming that the radiation effect on fracture toughness is equivalent to that on Charpy properties. Therefore, it is necessary to establish the correlation between both properties especially on irradiation embrittlement. In this paper, we present the fracture toughness data obtained by applying the master curve approach that was adopted recently in the ASTM test method. Materials used in this study are five ASTM A533B class 1 steels and one weld metal. Neutron irradiation for Charpy-size specimens as well as standard Charpy-v specimens was carried out at the Japan Materials Testing Reactor. The shifts of the reference temperature on fracture toughness due to neutron irradiation are evaluated. Correlation between the fracture toughness reference temperature and Charpy transition temperature is established. Based on the correlation, the optimum test temperature for fracture toughness testing and the method to determine a lower bound fracture toughness curve are discussed.
Hiura, Nobuo*; Yamaura, Takayuki; Motohashi, Yoshinobu*; Kobiyama, Mamoru*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 1(2), p.202 - 208, 2002/06
The purpose of this study is to develop oxygen sensor which can measure the oxygen potential of the fuel in a nuclear reactor. The oxygen sensor with CaO stabilized zirconia solid electrolyte has been specially designed in order to prolong its life time. Electromotive force (EMF) of solid galvanic cell Ni/NiO|ZrO
-CaO|Fe/FeO was measured in both the out-pile tests and the in-situ tests using Japan Material Testing Reactor (JMTR), and the characteristics of EMF was discussed. In the out-pile test, it was found that the EMF was almost equal to the theoretical values at temperatures ranging from 700 to 1,000
, and the life span of the sensor was very long up to 980h at 800. In the in-situ test, it was found that the EMF showed almost the reliable values up to 300 h (neutron fluence (E 
1 MeV) 1.5
10
m
), at temperatures from 700 to 900. The imprecision of the EMF was found to be within 6% of the theoretical values up to 1,650 h irradiation time (neutron fluence (E 1 MeV) 8.010 m) at 800. The oxygen sensors were found to be applicable for the oxygen potential measurement of the fuels in a reactor.
Department of JMTR
JAERI-Conf 99-006, 434 Pages, 1999/08
no abstracts in English
Ishihara, Masahiro; Oku, Tatsuo*
Nihon Kikai Gakkai Rombunshu, A, 62(602), p.2305 - 2309, 1996/00
no abstracts in English
Department of JMTR
JAERI-Conf 95-001, 87 Pages, 1995/03
no abstracts in English
Nagao, Yoshiharu; Shimakawa, Satoshi; ;
JAERI-Tech 95-006, 46 Pages, 1995/02
no abstracts in English
Yanagisawa, Kazuaki; ; Horiki, Oichiro; Soyama, Kazuhiko; Ichikawa, Hiroki; Kodaira, Tsuneo
Journal of Nuclear Science and Technology, 29(3), p.233 - 243, 1992/03
no abstracts in English
; Seguchi, Tadao; Yoshida, Kenzo
JAERI-M 86-043, 49 Pages, 1986/03
no abstracts in English
JAERI-M 85-204, 7 Pages, 1985/12
no abstracts in English
JAERI-M 82-026, 21 Pages, 1982/03
no abstracts in English
; ; Ueda, Shuzo
Nihon Kikai Gakkai Rombunshu, A, 42(359), p.2034 - 2041, 1976/00
no abstracts in English
; Kondo, I.; ; ; ; ;
JAERI-M 4706, 79 Pages, 1972/02
no abstracts in English
Kusunoki, Tsuyoshi; Tanimoto, Masataka; Kaminaga, Masanori; Ishihara, Masahiro; Araki, Masanori
no journal, ,
In August 2006, operation of the JMTR in JAEA was terminated due to assessment for the operation continuation decision. As a result of the national discussion, the JMTR was decided to continue operation after necessary refurbishment works. The refurbishment was finished in March 2011.However, in March 2011 just after the completion of the refurbishment, the Great-Eastern-Japan-Earthquake occurred, and the JMTR restart were delayed. On the other hand, based on the safety assessments considering the 2011 earthquake new regulatory requirements for research and test reactors have established on Dec., 2013 by the NRA. After evaluation and analyses to the new regulatory requirements were carried out, an application to the NRA was submitted on March, 2015. After taking measures for the safety requirements and the permission by the NRA, the renewed JMTR will be operated for a safety research of LWRs, basic research for nuclear engineering, industrial use, and education and training.
Sugiyama, Tomoyuki
no journal, ,
