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Abstract

This document reports on the results of a comparative study of national practice for the seismic reevaluation of operating NPPs which reflexts on the position in 1993. Many of the earlier designs of NPP excluded any consideration of seismicity. Later designs began to address the seismic hazard but in general not to the extent which would now be required for a modern plant.
Modern codes and standards directly include a requirement for NPP to be adequately protected against the effects of external events including earthquakes. In particular, a modern NPP has to be designed such that it can be safely shut down and maintained in a safe state in the event of a specific earthquake. As a consequence, this allows a better balance design and a greater level of confidence in the capabilities of the plant to withstand seismic events.
A comparison of the seismic design status of the European NPPs shows that of the 155 NPPs in Europe (including experimental and decommissioned reactors) 33% did not incorporate explicit seismic design. 67% of the European NPPs have been designed to withstand the seismic hazard, although the level of seismic design has evolved over the years.
A comparison of the seismic re-evaluation requirements shows that only two countries have an explicit regulatory requirement to re-evaluate the seismic hazard. The other countries have a regulatory requirement to carry out a periodic safety review every 10 years, and this review includes the consideration of the seismic hazard. d.

Additional information

Authors: GENTIL J, Institut de Protection et de Sûreté Nucléaire (FR)
Bibliographic Reference: EUR 16245 EN (1996) 145pp., FS, ECU 16.50
Availability: Available from the (2)
ISBN: ISBN 92-827-7186-5; ISSN
Record Number: 199610997 / Last updated on: 1996-09-30
Category: PUBLICATION
Original language: en
Available languages: en