Safety aspects of fast reactor core operation

On the basis of the operating experience for Phenix, the paper describes how to monitor the main safety parameters of the core without appreciably disturbing the power plant operation and how to guard against errors of core loading during handling operations. It deals in particular with the methods and the results of checking control rod efficiency and of following up the core reactivity and the neutron negative feedback factors. The authors indicate the preventive measures, spread over the handling chain, which were effective in preventing any core loading error during three years of operation. (author)