scholarly journals Beyond design basis seismic evaluation of underground liquid storage tanks in existing nuclear power plants using simple method

2021 ◽  
Author(s):  
Shen Wang
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Storage Tanks ◽  
Seismic Evaluation ◽  
Simple Method ◽  
Liquid Storage ◽  
Design Basis

Seismic Safety Margin of Cylindrical Liquid Storage Tanks in Nuclear Power Plants

2011 ◽  
Author(s):  
Akira Maekawa ◽  
Tsuneo Takahashi ◽  
Katsuhisa Fujita
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Large Scale ◽  
Safety Margin ◽  
Buckling Load ◽  
Storage Tanks ◽  
Seismic Safety ◽  
Liquid Storage ◽  
Design Value

In Japanese nuclear power plants, quantitative evaluation for seismic safety margin of the equipment is an important issue. In this study, the seismic safety margin of cylindrical liquid storage tanks used in nuclear power plants was investigated experimentally and analytically using test tanks with water inside. The buckling load of the tanks was examined because buckling was their dominant damage mode. The test tanks were reduced-scale models similar to the large-scale liquid storage tanks used in nuclear power plants. The experimental buckling load was compared with the design value. Furthermore, dynamic and static elastic-plastic buckling simulations by finite element analysis using a three-dimensional model were made and then the simulation results were compared with the experimental and design values. The simulated and experimental results agreed well, showing the values were the nearly-true buckling load, that is, proof stress. The design value was lower than the other values, indicating the difference was the seismic safety margin. The above results illustrated that existing actual tanks would have a bigger seismic safety margin.

Design basis information system for nuclear power plants

2002 ◽  
Author(s):  
R.S. May ◽  
C.R. Hardy ◽  
R.E. Engel ◽  
J.A. Woolley ◽  
M. Zeller
Keyword(s):  
Information System ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Design Basis

Investigation on Buckling Behavior of Cylindrical Liquid Storage Tanks Under Seismic Excitation: 2nd Report — Investigation on the Nonlinear Ovaling Vibration at the Upper Wall

2003 ◽  
Author(s):  
Hideyuki Morita ◽  
Tomohiro Ito ◽  
Koji Hamada ◽  
Akihisa Sugiyama ◽  
Yoji Kawamoto ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Pressure Effects ◽  
Storage Tanks ◽  
Response Level ◽  
Vertical Excitation ◽  
Liquid Storage ◽  
Buckling Behavior ◽  
Thin Walled ◽  
Scaled Models

When a thin walled cylindrical liquid storage tank suffers a large seismic base excitation, buckling phenomena such as elephant foot bulge at the bottom portion and nonlinear ovaling vibration at the upper portion shows nonlinearity between the input and response level and suddenly occurs for the excessive input level, thus will be called as “nonlinear ovaling vibration” hereafter in this paper, may be caused. In the 1st report, the elephant foot bulge phenomena and the liquid pressure effects were investigated. In this 2nd report of the series of studies, the effect of nonlinear ovaling vibration phenomena were investigated based on the dynamic buckling tests using scaled models of thin walled cylindrical liquid storage tanks for nuclear power plants. The mechanism and the effect of vertical excitation and liquid sloshing were also studied and discussed.

Motor-Operated Valve Importance Categorization Study Using Level 1 Internal PSA

2002 ◽  
Author(s):  
Yong Suk Lee ◽  
Chang Hyun Chung ◽  
Key Yong Sung
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Testing Program ◽  
Design Basis ◽  
Periodic Testing ◽  
Internal Event ◽  
Level 1

Recently GL 89-10 static and dynamic Motor-Operated Valve (MOV) tests are being performed in Korean nuclear power plants to ensure MOV operability in design basis condition. And GL 96-05 MOV periodic verification testing will be followed after GL 89-10 testing. MOV risk importance categorization will be incorporated in Korean MOV periodic testing program for effective MOV test. In this study, MOVs were preliminarily categorized based on risk importance measures FV and RAW using level 1 internal event PSA. Configuration effect and importance uncertainty effect to risk importance of MOVs were also investigated.

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