scholarly journals Tornado and extreme wind design criteria for nuclear power plants

1974 ◽  
Author(s):  
J.V. Rotz ◽  
G.C.K. Yeh ◽  
W. Bertwell
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Design Criteria ◽  
Extreme Wind

Cable Tray Ultimate Strength Test Employing a Large Shaker Table

2004 ◽  
Author(s):  
Kuniyoshi Komatsu ◽  
Katsunori Myojin ◽  
Hiroyuki Fuyama ◽  
Eiji Kokubo ◽  
Kazuo Imai
Keyword(s):  
Ultimate Strength ◽  
Elastic Strain ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Damping Ratio ◽  
Strength Test ◽  
Design Criteria ◽  
Nuclear Plants ◽  
Large Response

Ultimate behaviors of cable trays, used in nuclear plants, have not been well studied since cable trays are designed based on conservative design criteria. In this study, by employing a large shaker table, an ultimate strength test was conducted for cable trays used in nuclear power plants. This report describes the results of shaker table test. The following results were obtained: 1) In an S2* earthquake, the damping ratio was so large — more than 30% due to the rubbing of cables — that a large response was not present and the strains in the support were within the elastic limits. 2) The support was strong enough to sustain the cable trays even when the strain in the support was 20 times larger than elastic strain.

scholarly journals Feasibility Study on Strain-Based Seismic Design Criteria for Nuclear Components

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4435 ◽  
Author(s):  
Gyeong-Hoi Koo ◽  
Jong-Sung Kim ◽  
Yun-Jae Kim
Keyword(s):  
Feasibility Study ◽  
Seismic Design ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Failure Modes ◽  
Seismic Analysis ◽  
Design Criteria ◽  
Hardening Material ◽  
Inelastic Material

In this paper, the feasibility study to develop strain-based seismic design criteria applicable for the components of nuclear power plants are carried out as an alternative rule to the current stress-based criteria. To do this, two acceptance criteria are investigated through the detailed example of an application for the surge line nozzles in a nuclear steam supply system, which are known as one of the seismic fragile components in nuclear power plants. These strain-based seismic design criteria are primarily to prevent two types of failure modes, such as a ductile fracture and a cyclic fatigue-induced damage due to continuous large amplitude cyclic loads during seismic event. Through the example problem, the required procedures are described step-by-step with calculations of an accumulated plastic strain, triaxiality factor by the elasto-plastic seismic analysis using the finite element method. For a precise inelastic seismic analysis, the Chaboche kinematic and Voce isotropic hardening material parameters are identified by the test data and used for an inelastic material model. The results by the strain-based criteria are compared with those by the ASME (American Society of Mechanical Engineers) stress-based design criteria for a service level D limits. From the study, it is expected that the strain-based seismic design method investigated in this paper will be beneficial for the nuclear components, especially when the design basis earthquakes are large enough to cause severe plastic strains at a critical location.

Probability-based design criteria for shear walls in nuclear power plants

1986 ◽  
Vol 97 (3) ◽  
pp. 327-337 ◽  
Author(s):  
Howard Hwang ◽  
Bruce Ellingwood ◽  
Kimiya Nakai
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Shear Walls ◽  
Design Criteria
Sign in / Sign up

Export Citation Format

Share Document