Nuclear power plants. Instrumentation important to safety. Acoustic monitoring systems for detection of loose parts: Characteristics, design criteria and operational procedures

2009 ◽  
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Acoustic Monitoring ◽  
Monitoring Systems ◽  
Design Criteria ◽  
Loose Parts

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.

Fatigue Monitoring: Case Studies in Nuclear Power Plant

2018 ◽  
Author(s):  
G. Bourguigne ◽  
F. Schroeter
Keyword(s):  
Power Plant ◽  
Thermal Stratification ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Life Extension ◽  
Monitoring Systems ◽  
Fatigue Monitoring ◽  
Cycle Count ◽  
Critical Components

During design of Class I components in Nuclear Power Plants, cumulative usage factors (CUF) are conservatively calculated to estimate fatigue damage, and results must be below the limits of the applicable codes. Nevertheless, when these results are used to evaluate the possibility of using these components for an extended life, the results are frequently above code limits. Many Nuclear Power Plants have installed commercial fatigue monitoring systems at critical components in order to assess transient severity and cycle count for life extension fatigue calculations among other reasons. Since the commissioning of the system, unexpected operation modes and thermal stratification was discovered and evaluations needed to be done. Findings, interpretations and solving are presented in this paper.

Ultrasonic waveguide sensor for acoustic monitoring of nuclear power plants

1987 ◽  
Vol 63 (2) ◽  
pp. 636-639
Author(s):  
V. I. Mel'nikov ◽  
V. N. Khokhlov ◽  
A. V. Duntsev
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Acoustic Monitoring ◽  
Waveguide Sensor ◽  
Ultrasonic Waveguide
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