Report of Horonobe technical review meetings (FY 2004); 1st to 4th meetings (Document on present state of affairs)

Shirato, Nobuaki*; Matsui, Hiroya; Morioka, Hiroshi; Hatanaka, Koichiro; Takeuchi, Ryuji; Hatakeyama, Nobuya; Ohara, Hidefumi; Nakajima, Takahiro; Kunitomo, Takahiro

JNC TN5440 2005-001, 412 Pages, 2005/06

JNC-TN5440-2005-001.pdf:20.87MB

We held Horonobe technical review meeting 4 times a year. The first meeting is for the plan of Horonobe underground research laboratory and others. The secound meeting is for geology of Horonobe area and modeling study and data acquisition for safety assessment methodology and others. The third meeting is for ventilation network analyses on URL plan. The fourth meeting is for the remote monitoring system using ACROSS. This report is records of these meetings.

Strength evaluation of jointed parts between ODS cladding and end plug by means of alternative welding method

Hatakeyama, Koichi; Mizuta, Shunji; Fujiwara, Masayuki;

JNC TN9400 2001-110, 87 Pages, 2001/12

JNC-TN9400-2001-110.pdf:9.35MB

For the purpose of urgently discerning the applicability of ODS cladding tube to the long life core of the fast reactors, the irradiation test using Russian fast reactor BOR-60 is planned. In this irradiation test, TIG welding or laser welding will be applied as welding method of ODS cladding with end plug. In this report, applicability of alternative weldin9 method, i.e., TIG welding, laser welding, and also electron beam welding and 3 kinds of brazing diffusion bonding technique was evaluated. In addition, bending test and internal creep rupture test of the samples which were welded by laser and TIG welding were carried out. Following results were obtained in this study. (1) Tensile strength of laser welding test specimens with the highest energy density is most excellent in the welding process (over 90% of the base metal strength). (2) In the brazing filler metal, the tensile strength of the nickel brazing was most excellent (over 84% of the base metal strength). (3) In the bending test of laser and TIG welded test specimens, the crack was generated in circumferential direction of weld zone, which relatively corresponds to small bending angle. (4) As result of internal creep rupture test at 700C, cladding itself was ruptured in the high stress region, whereas, weld zone was ruptured in the low stress level.

Development of welding technique between PNC-FMS wrapper tube and SUS316 steel (II); Evaluation of welding technique for real size wrapper tube

; Fujiwara, Masayuki;

JNC TN9400 2001-082, 79 Pages, 2001/08

JNC-TN9400-2001-082.pdf:9.26MB

It is necessary to carry out the welding with the austenitic stainless steel in order to apply the high strength ferritic/Martensitic steel(PNC-FMS) with superior resistance to swelling as wrapper tube in "Joyo" and "Monju". If the ferrite phase would be formed at heat affected zone(HAZ) in welding between PNC-FMS wrapper tube and SUS316 steel, toughness degradation would be suspected. In this study, as the method in which ferrite was not formed at the weld zone, the elimination of ferrite by the heat treatment was examined, and the heat treatment condition was optimized. The possibility and realization of manufacturing the PNC-FMS wrapper tube with joint structure to SUS316 short length tube were also evaluated. The results obtained are summarized as follows. (1) ferrite phase in welding part is successfully eliminated by carryjng out the normalizing processing over 1050C 10min as a post-welding heat treatment. (2)As a fabrication process, the following process was selected from the viewpoint of practical application. TIG welding of PNC-FMS round tube and SUS316 round tube Post-welding heat treatment Cold drawing(hexagonal tube) Normalizing, tempering The dimension adjustment by the cold drawing (3)As a result of investigation of microstructure and mechanical properties of the weld zone of produced wrapper tube, the satisfied performance of the joint was confirmed.

Electric quadrupole moment measurement using a new RF-application system

Nagae, Daisuke; Takemuara, Makoto*; Ueno, Hideki*; Kameda, Daisuke*; Asahi, Koichiro*; Yoshimi, Akihiro*; Sugimoto, Takashi*; Nagatomo, Takashi*; Kobayashi, Yoshio*; Uchida, Makoto*; et al.

no journal, , 

An electric quadrupole moment ( moment) is sensitive to collective aspects of nuclear structure. In the -moment measurement for unstable nuclei, we employ the -detected nuclear-quadrupole resonance method. In this method, we need to supply resonance frequencies, where denotes the nuclear spin. We have developed a new RF-application system to induced all of the transitions. The application of the frequencies may be pursued in two different ways; the sequential RF pulse method and the mixed-wave RF pulse method. We confirmed the reversal of polarization for the both methods, from measurements of -ray asymmetry change for polarized B. Using this system, the moments of Al have been measured to be mb and mb by the sequential RF pulse method.