Observations on some difficulties of revising the current licensing criteria and scenarios on technical procedures for seismic design

This paper will deal with the personal observation of the revised works of the Seismic Licensing Criteria, which was issued in 1981. This work has been carrying out for two years already. He understands that the problem, key issues, may be expressed as 'how to establish the scenario' for administrative controlling the seismic design to keep the seismic safety of nuclear power plants. Last several months, new events came to us, an earthquake, illegal procedure of plant owners, unexpected legal judgment for engineers and so on. The author tries to discuss them as well as possible at this moment. (author)