HTGR Knowledge Base

Conference Article: Study on the seismic load against the HTTR building. Seismicity and wave propagation features of the HTTR site.

Suzuki, T. (Hazama-Gumi Ltd, Tokyo (Japan). Building Construction Div.); Yamagishi, Y. (Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Construction Div.); Tokita, K. (Tokyo Electric Power Services Company Ltd, Tokyo (Japan). Seismic Engineering Dept.)

Abstract

JAERI is designing High Temperature Testing Reactor (HTTR). Safety examination by the government is now under way. The construction is to be started from 1990. For the seismic design of HTTR, JAERI has discussed the safety of the reactor from various point view. In this paper, following two discussions are reported. 1) Seismicity around the HTTR Construction site. Kanto Area to which HTTR site belongs experienced large earthquake in the past. Estimated maximum velocity of their earthquakes is around 9.0 cm/s. According to the investigation of maximum velocity expectancy, earthquakes whose maximum velocity exceeds 8 cm/s occurs 200 years interval, while the durable time of HTTR is 20-30 years. 2) Features of earthquake wave propagation. For this study, earthquake observation is performed whose maximum depth is 170 m below the surface. During the observation of 7 months, 55 earthquakes are recorded. Among them, 4 earthquake waves are chosen for analysis, whose maximum acceleration are relatively large. Comparison of these records in the form of the transfer function shows good agreement. Therefore, the feature of wave transfer is found to be specified by the site situation regardless of the input motion. On the other hand, a simulation of wave propagation is studied. Results of analysis with one dimensional wave propagation model (laterally layered soil deposit model) shows good agreement to the observed wave in the form of transfer function. One dimensional model is confirmed to be enough to explain the feature of HTTR site situation.

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key words: Gas Cooled Reactor, Nuclear Technology
Reference:
Seismic behaviour of gas cooled reactor components. Proceedings of a specialists' meeting held in Gif-sur-Yvette, France, 14-16 November 1989
International Atomic Energy Agency, Vienna (Austria). International Working Group on Gas-Cooled Reactors
IWGGCR--22, pp:45-52