Fundamental study on failure evaluation method of integrated vibration energy for component (Integrated energy of simple examination specimen at random wave test)

Okamura, Shigeki*; Kinoshita, Takahiro*; Yamano, Hidemasa   ; Kurisaka, Kenichi ; Futagami, Satoshi  ; Fukasawa, Tsuyoshi*

The seismic evaluation of key components such as the reactor vessel is important for the seismic probabilistic risk assessment in sodium-cooled fast reactors. In the past, the correlation of the fatigue failure and the integrated vibration energy to the component was applied to the failure evaluation in the seismic assessment. The objective of this study is to develop a failure probability evaluation method, which evaluates integrated vibration energy to the component during an earthquake. The fatigue failure evaluation method is investigated with simple vibration examination to failure. The vibration examination with the simple examination specimens, of which main vibration mode is the bending vibration, has been carried out by the random wave. This paper describes the estimation of the integrated vibration energy with the random waves. The integrated vibration energy of the random wave was compared with the integrated vibration energy of the sine wave by the integrated energy per unit time. The integrated vibration energy of the random wave is in the range of the approximate line, which is estimated with the integrated vibration energy of the sine wave. The evaluation method investigated in this study is expected to estimate the integrated energy with the random wave by the integrated energy with the sine wave.