scholarly journals Seismic safety margin research program. Program plan, Revision II

1978 ◽  
Author(s):  
P.D. Smith ◽  
F.J. Tokarz ◽  
D.L. Bernreuter ◽  
G.E. Cummings ◽  
C.K. Chou ◽  
...  
Keyword(s):  
Research Program ◽  
Safety Margin ◽  
Seismic Safety ◽  
Program Plan

scholarly journals Seismic Safety Margins Research Program: Phase II program plan (FY 83-FY 84)

1982 ◽  
Author(s):  
M.P. Bohn ◽  
D.L. Bernreuter ◽  
L.E. Cover ◽  
J.J. Johnson ◽  
L.C. Shieh ◽  
...  
Keyword(s):  
Phase Ii ◽  
Research Program ◽  
Seismic Safety ◽  
Safety Margins ◽  
Program Plan

Seismic Proving Test of Ultimate Piping Strength: Test Results on Piping Component and Simplified Piping System

2002 ◽  
Author(s):  
Kenichi Suzuki ◽  
Y. Namita ◽  
H. Abe ◽  
I. Ichihashi ◽  
Kohei Suzuki ◽  
...  
Keyword(s):  
Large Scale ◽  
Safety Margin ◽  
Current Status ◽  
Piping System ◽  
Test Results ◽  
Seismic Safety ◽  
System A ◽  
Seismic Design Code ◽  
Piping Systems ◽  
Technical Issues

In 1998FY, the 6 year program of piping tests was initiated with the following objectives: i) to clarify the elasto-plastic response and ultimate strength of nuclear piping, ii) to ascertain the seismic safety margin of the current seismic design code for piping, and iii) to assess new allowable stress rules. In order to resolve extensive technical issues before proceeding on to the seismic proving test of a large-scale piping system, a series of preliminary tests of materials, piping components and simplified piping systems is intended. In this paper, the current status of the piping component tests and the simplified piping system tests is reported with focus on fatigue damage evaluation under large seismic loading.

Evaluation of Seismic Integrity for an Integral Reactor Assembly

2004 ◽  
Author(s):  
Soon Myeon Wang ◽  
J. S. Kim ◽  
T. E. Jin ◽  
M. J. Jhung ◽  
Y. H. Choi ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Seismic Analysis ◽  
Coupling Effect ◽  
Response Spectrum ◽  
Safety Margin ◽  
Time History ◽  
Element Model ◽  
Seismic Safety ◽  
Reactor Assembly ◽  
Integral Reactor

The structural integrity of integral reactor assembly of 65Mwt thermal capacity is assessed by using the commercial finite element package ANSYS in order to evaluate the seismic safety margin. First of all, the modal analyses are performed using the various analysis models with/without the fluid coupling effect in order to validate a super element model and to evaluate the coupling effect on natural frequency. Based on the modal analysis results, the seismic analyses are performed using the ground response spectrum defined in Reg. Guide 1.60. Finally, time-history analyses are performed using the modal analysis results, the super element model and an inertia load approach. As a result, the reliable and efficient seismic analysis model for an integral reactor assembly is developed and it is found that an integral reactor assembly has the sufficient seismic safety margin.

Study on Estimation Method for Seismic Safety Margin of 3D Piping System With Degradation: Establishing Elasto-Plastic Analysis Model

2004 ◽  
Author(s):  
Akira Mikami ◽  
Makoto Udagawa ◽  
Hajime Takada
Keyword(s):  
Analytical Model ◽  
Cross Section ◽  
Safety Margin ◽  
Estimation Method ◽  
Piping System ◽  
Analysis Model ◽  
Average Amplitude ◽  
Seismic Safety ◽  
Dynamic Analyses ◽  
Plastic Analysis

The authors have proposed an analytical model by which they can simulate the experimental results of a piping system with full circumferential 48% thinning at an elbow or two elbows. A series of elasto-plastic analyses has been carried out in order to investigate the experimental behavior of the piping system. Dynamic analyses describe the ratcheting behavior and the average amplitude of the opening-closing displacement at elbows relatively well. And then static analyses describe ratcheting and ovaling of the cross section of pipes fairy well.

ICONE19-44058 THE SEISMIC SAFETY MARGIN EVALUATION OF THE BWR SCRAMMABILITY AT SEISMIC EVENTS

2011 ◽  
Vol 2011.19 (0) ◽  
pp. _ICONE1944-_ICONE1944
Author(s):  
Shohei Onitsuka ◽  
Hirokuni Ishigaki ◽  
Yuichi Koide ◽  
Yoshihiro Goto ◽  
Norio Kawashima ◽  
...  
Keyword(s):  
Safety Margin ◽  
Seismic Events ◽  
Seismic Safety

Seismic Safety Margin Assessment for Thin-Wall Cylindrical Tanks Utilizing Ultimate Strength Test

2010 ◽  
Author(s):  
Toru Iijima ◽  
Masaki Nakagawa ◽  
Akira Shibuya ◽  
Katsumi Ebisawa ◽  
Hiroyuki Kameda
Keyword(s):  
Ultimate Strength ◽  
Seismic Design ◽  
Nuclear Power ◽  
Power Plants ◽  
Safety Margin ◽  
Strength Test ◽  
Thin Wall ◽  
Seismic Capacity ◽  
Seismic Safety ◽  
Cylindrical Tanks

In Japan, the Seismic Design Guideline for Nuclear Power Plants revised in 2006 requires that residual risk for earthquakes beyond design base be considered. Moreover, in the Niigata-ken Chuetsu-oki earthquake (NCOE:2007), the earthquake motion exceeded the seismic design condition of the Kashiwazaki-Kariwa nuclear power plants (KK NPPs). In response to these issues, there is a growing demand for quantitative clarification of seismic safety margin. The Japan Nuclear Energy Safety Organization (JNES) started a study on the seismic safety margin. JNES defined the term “seismic safety margin” in this study. The seismic safety margin is based on the probability distribution of seismic response and seismic capacity of equipment. Regarding the seismic capacity, JNES has carried out seismic capacity tests on various types of equipment whose malfunction would significantly affect core damage frequency in terms of seismic probabilistic safety assessment (seismic PSA). Our seismic safety margin is effective to understand the quantitative margin related to the failure of equipment. JNES applied the concept of seismic safety margin to thin wall cylindrical tanks utilizing ultimate strength test results, and compared it with the design margin. This paper reports examples of the seismic margin evaluation of cylindrical tank.

scholarly journals Fundamental study on seismic safety margin for seismic isolated structure using the laminated rubber bearings

2021 ◽  
Author(s):  
Tsuyoshi FUKASAWA ◽  
Takayuki MIYAGAWA ◽  
Masato UCHITA ◽  
Tomohiko YAMAMOTO ◽  
Masashi MIYAZAKI ◽  
...  
Keyword(s):  
Safety Margin ◽  
Fundamental Study ◽  
Seismic Safety ◽  
Rubber Bearings
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