Automatic seismic trip system trigger signal

When a DIP value is utilized as the ASTS trigger signal of a nuclear power plant, it needs to be a real time value that can be processed on a moment-to-moment basis for DIP exceedance determination during an earthquake.

Like in the ASTS of a nuclear power plant, signals during an earthquake are used for general industrial purposes to discontinue operation, thereby minimizing seismic damage to the extent possible. To this end, seismic instruments that are categorized as seismic switches, have been proposed. When the observed acceleration itself is used as a parameter, real time computation (data processing) is not required. However, it may cause malfunctions because acceleration does not always lead to component damage, as mentioned earlier, and depending on the sensitivity of the seismometer, high frequency noise may also be picked up.

To minimize seismically induced damage by early shutdown, it may be reasonable to consider that actions will be taken to prevent first excursion damage, which is more likely to occur in a short interval of time than cumulative damage. The JMA instrumental seismic intensity, which has been discussed as a parameter for first excursion damage, does not lend itself to real time computation during an earthquake because it uses a frequency range filter, as shown in the computation procedure in Section 4.1.2. In Japan, therefore, various methods for computing real time instrumental intensity have been proposed.

The National Research Institute for Earth Science and Disaster Prevention in Japan has proposed a method called the real time seismic intensity indicator (Ir), in which JMA instrumental seismic intensity is calculated by approximating the frequency filter with a filter in the time domain.

The details and algorithm of Ir computation are shown in Ref. [60]. Fig. 68 shows the correlation between two AJMA, one is from the original calculation procedure shown in Section 3.1.2 and the other, shown as ‘Real Time AJMA‘ in the figure, from the Ir processing method indicated in Ref. [60]. Points in the figure have been calculated using observed earthquake waves at nuclear power plants and conventional industrial facilities. A typical calculated time-history of the Real Time AJMA , and the corresponding Ir, is shown in Table 37. It can be seen that Ir has a promising role as an indicator for ASTS in the future. However, the calculation time of Real Time AJMA increases with the earthquake duration. This is an issue to be solved for the actual application.

TABLE 37. TYPICAL TIME-HISTORY OF REAL TIME IJMA (IR) AND REAL TIME AJMA (OBSERVED ACCELERATION AT KASHIWAZAKI-KARIWA UNIT 1 REACTOR BUILDING BASE MAT DURING 2007 NIIGATA-KEN CHUETSU-OKI EARTHQUAKE)

FIG. 68. Correlations between original AJMA and Real Time AJMA

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ANNEX I: EXAMPLES OF EARTHQUAKE DATA COLLECTION SHEETS