JOPSS - Search Results

Journal Articles

Development of performance evaluation methods for small unmanned aircraft systems flying in constrained environment

Kawabata, Kuniaki; Sato, Noritaka*

Keisoku To Seigyo, 62(5), p.276 - 279, 2023/05

no abstracts in English

Journal Articles

Failure estimation methods for steam generator tubes with wall-thinning or crack

Yamaguchi, Yoshihito; Mano, Akihiro; Li, Y.

Proceedings of ASME 2022 Pressure Vessels and Piping Conference (PVP 2022) (Internet), 10 Pages, 2022/07

The steam generator (SG) tube is one of the important components in pressurized water reactors. Flaws such as wall-thinning or stress corrosion cracking have been reported in SG tubes. The burst pressure where both the internal and external pressures from the primary and secondary coolant systems are considered must be predicted to assess the structural integrity of SG tubes. Burst tests were performed by various organizations. On the basis of the test results, failure estimation methods were proposed. In this study, previous burst test data and existing failure estimation methods for SG tubes with wall-thinning or crack were investigated. As a result, the coefficient of the existing estimation method for SG tube with uniform wall-thinning was updated. In addition, failure estimation methods that are suitable for SG tubes with crack or local wall-thinning were proposed by considering the effects of the flaw shape and size on the burst pressure. The applicability of the failure estimation methods was confirmed by comparing the predicted results with the burst test data in actual SG tubes.

Journal Articles

Failure bending stresses for small diameter thick-wall pipes

Yamaguchi, Yoshihito; Hasegawa, Kunio; Li, Y.; Lacroix, V.*

Proceedings of ASME 2022 Pressure Vessels and Piping Conference (PVP 2022) (Internet), 4 Pages, 2022/07

Journal Articles

Development of evaluation method for photocatalytic ability by ion chromatography combined with a flow-type reactor; Application to immobilized photocatalyst materials prepared by double-layer coating method

Sugita, Tsuyoshi; Kobayashi, Kentaro*; Yamazaki, Taiki*; Isaka, Mayu*; Itabashi, Hideyuki*; Mori, Masanobu*

Journal of Photochemistry and Photobiology A; Chemistry, 400, p.112662_1 - 112662_8, 2020/09

https://doi.org/10.1016/j.jphotochem.2020.112662

Times Cited Count：1 Percentile：2.37(Chemistry, Physical)

In this study, we developed an in-line photocatalytic performance evaluation system in which a flow reactor was connected to the ion chromatography to accurately evaluate the performance of the photocatalyst. This system was used to evaluate the photocatalyst supported by the two-layer support method on the substrate, such as glass beads. The performance of the photocatalyst was evaluated using dimethyl sulfoxide (DMSO), and it was possible to monitor the decomposition of DMSO by UV and the formation of by-products, such as methane sulfonate (MSO) and sulfate (SA). This system can be expected to be useful not only for evaluating the decomposition performance of an object using a photocatalyst but also for evaluating the byproducts.

JAEA Reports

Current status and future plan for thermaI striping investigations at JNC

; kasahara, Naoto; ; ; Kamide, Hideki

JNC TN9400 2000-010, 168 Pages, 2000/02

JNC-TN9400-2000-010.pdf:8.78MB

Thermal striping is significant issue of the structural integrity, where the hot and cold fluids give high cycle fatigue to the structure through the thermal stress resulted from the time change of temperatur distibution in the structure. In the sodium cooled fast reactor, temperature change in fluid easily transfers to the structure because of the high thermal conductivity of the sodium. It means that we have to take care of thermal striping, The thermal striping is complex phenomena between the fluid and structure engineering fields. The investigations of thermal striping are not enough to evaluate the integrity directly. That is the fluctuation intensity at the structure surface is assumed to be temperature difference between source fluids (upstream to the mixing region) as the maximum value in the design. 0therwise, the design conditions are defined by using a mockup experiment and large margin of temperature fluctuation intensity. Furthermore, such evaluation manners have not yet been considered as a design rule. Transfer mechanism of temperature fluctuation from fluid to structure has been investigated by the authors on the view points of the fluid and structure. Attenuation of temperature fluctuation was recognized as a dominant factor of thermal fatigue. We have devdoped a numerical analysis system which can evaluate thermal fatigue and crack growth with consideration of the attenuation of temperature fluctuation in fluid, heat transfer, and structure. This system was applied to a real reactor and the applicability was confirmed. Further verification is planned to generalize the system. For the higher cost performance of the fast reactor, an evaluation rule is needed, which can estimate thermal loading with attenuation and can be applied to the design. An idea of the rule is proposed here. Two methods should be prepared; one is a precise evaluation method where mechanism of attenuation is modeled, and the other is simple evaluation method where ...

JAEA Reports

None

Miura, Kinya*;

JNC TJ1400 99-027, 32 Pages, 1999/03

JNC-TJ1400-99-027.pdf:1.45MB

no abstracts in English

JAEA Reports

None

Tsujimura, Norio; Shinohara, Kunihiko; Momose, Takumaro

PNC TN8510 98-001, 13 Pages, 1998/07

PNC-TN8510-98-001.pdf:0.63MB

None

JAEA Reports

None

PNC TJ1600 98-004, 50 Pages, 1998/03

PNC-TJ1600-98-004.pdf:1.63MB

no abstracts in English

JAEA Reports

Estimation of subcriticality with the computed values, II

Sakurai, Kiyoshi; Arakawa, Takuya*; Naito, Yoshitaka

JAERI-Research 96-008, 77 Pages, 1996/02

JAERI-Research-96-008.pdf:1.66MB

no abstracts in English

JAEA Reports

Estimation of subcriticality with the computed value

Naito, Yoshitaka; Arakawa, Takuya*; Sakurai, Kiyoshi

JAERI-Research 95-053, 24 Pages, 1995/07

JAERI-Research-95-053.pdf:0.85MB

no abstracts in English

Journal Articles

Evaluation methodology for seismic base isolation of nuclear equipments and computer code EBISA

RIST News, (20), p.12 - 19, 1995/00

no abstracts in English

JAEA Reports

None

Ishikawa, Masayuki*; Kasahara, Naoto

PNC TN9520 93-003, 57 Pages, 1993/03

PNC-TN9520-93-003.pdf:2.08MB

None

JAEA Reports

None

PNC TJ1604 93-003, 46 Pages, 1993/03

PNC-TJ1604-93-003.pdf:1.84MB

no abstracts in English

JAEA Reports

Materials properties data sheet (No.F01); Low-cycle fatigue properties data on Mod.9Cr-1Mo steel in air and in sodium

; Hirakawa, Yasushi; Furukawa, Tomohiro; ; ; ;

PNC TN9450 91-004, 71 Pages, 1991/07

PNC-TN9450-91-004.pdf:1.82MB

In order to advancement in materials strength standard on elevated temperature design guide of the FBRs and evaluation method of materials strength behavior, this report are presented about the low-cycle fatigue properties of Mod.9Cr-1Mo steel, based on the R&D results obtained through the sctivities of material tests. Contents of the data sheet are as follows; [Material ; Mod.9Cr-1Mo steel(SR)] F2 Heat 1,0001,00012mm $^{t}$ (Plate) F4 Heat 1,0001,000250mm $^{t}$ (Forging) F6 Heat 1,0001,00025mm $^{t}$ (Plate) [Environment; In Air and in Sodium] [Test temperature ; 450, 500, 550, 600 and 650 $^{circ}$ C] [Strain rate ; 0.1%/sec (10 $^{-3}$ mm/mm/sec)] [Strain range ; 0.38% 1.86%] [Number of deta ; 83 points]