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Furuhashi, Ichiro*; kasahara, Naoto
JNC TN9400 2001-119, 33 Pages, 2002/01
Two types of finite element models analyzed eigenvalues of hot-leg pipelines of a large-scale sodium reactor. One is a beam element model, which is usual for pipe analyses. The other is a shell element model to evaluate particular modes in thin pipes with large diameters. Summary of analysis results: (1)A beam element model and a shell element model evaluated the same mode for the first order natural frequency. A beam element model is available to get the first order vibration mode. (2)The maximum difference ratio of beam mode natural frequencies was 14% between a beam element model with no shear deformations and a shell element model. However, its difference becomes very small, when shear deformations are considered in beam element. Beam analysis Beam analysis Shell analysis Shear ignored Shear considered Shear considered The first order X-directional horizontal mode 13.47Hz 12.03Hz 11.84Hz The first order Y-directional horizontal mode 13.51Hz 12.06Hz 11.82Hz The first order Z-directional vertical mode 46.33Hz 45.33Hz 43.75Hz (3)In the first order horizontal mode, the Y-piece acts like a pendulum, and the elbow acts like the hinge. The natural frequency is strongly affected by the bending and shear rigidities of the outer supporting pipe. (4)In the first order vertical mode, the vertical sections of the outer and inner pipes moves in the axial-directional piston mode, the horizontal section of inner pipe behaves like the cantilever, and the elbow acts Hke the hinge. The natural frequency is strongly affected by the axial rigidity of outer supporting pipe. (5)Both effective masses and participation factors were small for particular shell modes.
Tamura, Kazuo*; Iriya, Yoshikazu*
JNC TJ9440 2000-004, 22 Pages, 2000/03
In the probabilistic safety assessment(PSA), the fault tree/event tree technique has been widely used to evaluate accident sequence frequencies. However, event tansition which operators actually face can not be dynamically treated by the conventional technique. Therefore, we have made the dynamic analysis program(DYANA) for event transition for a liquid metal cooled fast breeder reactor. In the previous development, we made basic model for analysis. However, we have a probrem that calculation time is too long. At the current term, we made parallelization of DYANA usig MPI. So we got good performance on WS claster. It performance is close to ideal one.
Watari, Shingo
JNC TJ8410 99-008, 41 Pages, 1999/12
On understanding the radionuclide transport in Natural Barrier in radioactive waste isolation research, the macroscopic dispersion in heterogeneous permeability field in the underground rock is regarded as an important process. Therefore, Japan Nuclear Cycle Development Institute (JNC) developed the MACRO experiment with an artificial heterogeneous permeability field and has been conducted lots of tracer experiments. To estimate the effect of characteristics of field on the macroscopic dispersion using data from those tracer experiments, the evaluation of dispersion coefficient is required. In this report, the macroscopic dispersion coefficients were evaluated for the results of the tracer experiments using the MACRO facility with a single well. The coefficients for the experiments of 18 cases were evaluated by the fitting of analytical solution to the breakthrough curve measured in the Well. In the evaluations, the correction of data measured in the experiments and of the accuracy in the evaluation were considered. The conclusions are as follows. (1)The macroscopic dispersion coefficients for 18 cases were evaluated using Least Square Method by fitting the analytical evaluation to the result of experiment. Consequently, the coefficients for 7 cases were evaluated with not enough accurate fitting results. Therefore, another evaluations for those 7 cases were required to be with more accuracy. Then, those coefficients were evaluated with enough accuracy. (2)It was verified that the macroscopic dispersion coefficient tend to be increased with increase of the average radius of tracer front. In some cases, however, the trend was not verified because of the limit of accuracy for data measured in the experiment and for the evaluation method of the coefficient. (3)It was found that the macroscopic dispersion coefficients evaluated for the cases with heterogeneous permeability field type B tend to be higher than those with heterogeneous permeability field type A.
Saito, Hioraki*; Iriya, Yoshikazu*
JNC TJ8440 99-003, 156 Pages, 1999/03
no abstracts in English
*; *; *
PNC TJ9270 95-003, 144 Pages, 1995/03
no abstracts in English
Onishi, Teruaki*; Nara, A.*; Hashimoto, Kiyoshi*
JNC TJ1400 2005-025, 99 Pages, 1994/02
*; *; *
PNC TJ9270 90-001, 426 Pages, 1989/02
A general purpose finite element nonlinear structural analysis system FINAS has been developed since 1976 for fast breeder reactor (FBR) components. Extension, improvement and maintenance of this system has been continued hitherto. This report describes the results of the work which was carried out during September 1988 to February 1989. FINAS is equippd with basic capabilities of a general purpose program as the results of the past ten years development. However improvement and enchancement of this system are needed to cover more wide range of problems. In this year, inelastic analysis, large deformation analysis, fracture mechanics analysis, dynamic analysis and fluid-structure interaction analysis were mainly extended, improved and developed. The first part of this report is the result of maintenance and extension obtained in this year. In second part, the theory of structural analysis and numerical method employed ln FINAS are described. Finally, numerical examples intended for verification and demostration of applicability to practical problems are illustrated.
*; *; *
PNC TJ9270 88-002, 346 Pages, 1988/02
A general purpose finite element nonlinear structural analysis system FINAS has been developed since 1976 for structural design of fast breeder reactor (FBR) components. Extension, improvement and maintenance of this system has been continued hitherto. This report describes the results of the work which was carried out during September 1985 to February 1986. FINAS is equipped with basic capabilities of a general purpose program as the results of the past ten years development. However improvement and enhancement of this system are needed to cover more wide range of problems. In this year, inelastic analysis, large deformation analysis, fracture mechanics analysis, fluid-structure interactions analysis and dynamic analysis were mainly extended, improved and developed. The first part of this report is the result of maintenance and extension obtained in this year. In the second part, the theory of structural analysis and numerical method employed in FINAS are described. Finally, numerical examples intended for verification and demonstration of applicability to practical problems are illustrated.
*; *; *
PNC TJ9270 86-001, 314 Pages, 1986/02
A general purpose finite element nonlinear structural analysis system FINAS has been developed since 1976 for structural design of fast breeder reactor (FBR)components. Improvement and maintenance of this system has been continued hitherto. This report describes the results of improvement and maintenance which were carried out during September 1985 to February 1986. FINAS is equipped with basic capabilities of a general purpose program as the results of the initial five years development. However improvement and enhancement of this, system are needed to cover more wide range of problems. In this year, solver module, inelastic analysis, fluld-structure interactions analysis and dynamic analysis were mainly improved and developed in consideration of computational efficiency. The first part of this report is the result of maintenances and improvements obtained in this year. In second part, the theory of structural analysis and numerical method employed in FINAS are described. Finally, numerical examples intended for verification and demonstration of applicability to practical problems are illustrated.
PNC TJ240 85-01, 305 Pages, 1985/03
no abstracts in English
*; *; *
PNC TJ940 84-01, 292 Pages, 1984/06
A general purpose finite element nonlinear analysis system FINAS has been development since July 1976 for structural design of fast breeder reactor (FBR) components.Maintenance and improvement for this system are continued since July 1981. The objective of this report is to show the results of maintenance and improvement which were carried out during July 1983 to Jun 1984. FINAS is equipped with basic capabilities of a general purpose program as the results of the initial five years development. However enchancement and improvement of this system are under going to cover more widely class problems. In this year, dynamic files allocation for a large scale problem, non axi-symmetric analysis and heat transfer analysis are mainly improved in consideration of computational efficiency. Then FINAS is newly installed in Japan Atomic Energy Research Institute in August 1983. The first part of this report is the result of maintenances and improvements obtained in this year. In second part, the theory of structual analysis and numerical method employed m FINAS are described. Finally, numerical examples which are the verification and application to realistic problems are illustrated.