A Comparison between Japanese and French A16 defect assessment procedures for thermal fatigue crack growth

Wakai, Takashi; Horikiri, Morito; Poussard, C.*; Drubay, B.*

Nuclear Engineering and Design, 235, p.937 - 944, 2005/05

https://doi.org/10.1016/j.nucengdes.2004.11.014

This paper presents the results of a benchmark on thermal fatigue crack growth evaluation for a thick-wall cylinder subjected to cyclic thermal transients. The simplified crack growth evaluation methods of both JNC in JAPAN and A16 procedures proposed by CEA in France are presented. The predictions obtained using both methods are compared with the experimental data. The JNC method, which accounts for the non-linear stress component provides predictions of crack advance in a good agreement with the experimental data. In contrast, significant differences are observed between the A16 predictions and the experimental data. The discrepancies are mainly due to the non-linear stress component which is not accounted for in the A16 method. When using the JNC stress intensity factor solution determined by finite element analysis to account for the non-linear stress component, the A16 method well predicts the thermal fatigue crack growth behavior.

Data Base of Critical Experiments in Deuterium Critical Assembly

Hazama, Taira; Kono, Naomi; Horikiri, Morito; Sato, Seiji*; Hachiya, Yuki*; Hosoda, Atsushi*

JNC TN9450 2003-005, 908 Pages, 2003/06

JNC-TN9450-2003-005.pdf:38.35MB

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Horikiri, Morito

Saikuru Kiko Giho, (17), 139 Pages, 2002/00

https://rdreview.jaea.go.jp/gihou/pdf2/n17-17.pdf

https://rdreview.jaea.go.jp/gihou/pdf2/n17-22.pdf

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A Proposal of high temperature design method for tubesheet structures

Kasahara, Naoto; Iwata, Koji; Imazu, Akira; Horikiri, Morito; Tokura, Sunao*

PNC TN9410 90-032, 321 Pages, 1989/12

PNC-TN9410-90-032.pdf:6.08MB

Tubesheet structures are one of the most critical portions in the LMFBR components, and also have complicated configurations. Consequently, the specialized evaluation methods are required for design of tubesheets. In the case of structural design of the prototype LMFBR "Monju", the tentative design evaluation method had been suggested. It is the purpose of this study to propose the advanced method, that can be applied to designs of condenced tubesheets and of higher temperature operating ones, which are required in the demonstration LMFBR. As a conventional design method, ASME Sec. III A-8000 is basicaly adopted in the world. A-8000, however, is the elastic design method for LWR where main loading is inner pressure. For a design of tubesheets in LMFBR, It is necessary to make A-8000 adopted to thermal stress and to develop inelastic strain calculation methods. In this study we clarified the application range of A-8000 and proposed the improved method to calculate thermal stresses. The elastic design method based on perforated palate models without A-8000 is also developed. To evaluate inelastic responses of material, the relation between inelastic strain amplifications around holes of tubesheets and ligament efficiencies is obtained in the view point of dependence of inelastic behavior on ligament efficiencies. As the results, we developed the inelastic strain concentration factor which have consistency with the general purpose high temperature design code.

Analysis report on test of tubesheet model of evaporator

Kasahara, Naoto; Horikiri, Morito; Iwata, Koji; Uno, Tetsuro*; Imazu, Akira; Tokura, Sunao*

PNC TN9410 87-057, 245 Pages, 1987/03

PNC-TN9410-87-057.pdf:33.69MB

The structural design methods for tubesheets have been studied in connection with the development of fast breeder reactors, because tubesheet structures have complex and 3-dimmensional configulation, and are subjected to severe thermal loading. In Japan the tentative guidelines for structural design methods for tubesheets of FBR plants are proposed by the task group on the design methods of tubesheets in Power Reactor and Nuclear Fuel Development Corporation. The objective of this study is to validate this tentative methods by using data obtained from thermal transient tests of tubesheet models of evaporator and detailed analytical study, and moveover to provide usuful knowledge to rationalize the tentative guidelines. In this report, simplified methods of thermal and stress analyses for tubesheet structures are newly proposed and applied to thermal transient tests of tubesheet models which were carried out in 1984. The works contained in this report are summarized as; (1)Heat transfer analyses with 3-dimensional full model and elastic analyses with the same model are executed on the tubesheet structure, and the mechanism of thermal stress generation in the tubesheets is clarified. (2)Two simplified heat transfer analysis models are developed: the convection film model and the modified perforated plate model. Tbose models are proved to be accurate enough through the comparison with the results of 3-dimensional analyses. (3)Heat-transfer coefficient on the tubesheet structures are discussed with the data of temperature tests and thermal-hydraulicanalyses. As the results, it is shown that the film heat-transfer formula for turbulent flow inside tubes canbe used conservatively for inner surface of shrouds. (4)The simplified inelastic analysis method for tubesheets is developed. This method uses 2-dimensional models considering 3-dimensional effects of shrouds. As the results of comparison with the thermal transient test data of tubesheet model, the ...