VTT Automation, PL 130 1,02044 VTT, FINLAND Pekka.Pyy vtt.fi, Kari.Laakso vtt.fi Abstrsct: This experience based study on human errors in NPP maintenance used about 4400 maintenance history records and licensee event reports of an NPP from the years 1992-94 as its material. The aims of the study were to identify common cause failure mechanisms, allow statistical treatment and generate numerical safety indicators. About 30 dependent failures were identified for in-depth root cause analyses. The instrumentation is very prone to human errors. Most errors stem from the refueling outage period, and about half of them were identified during the same outage. Plant modifications are an important source class. Enhanced coordination and review, post-installation checking and starbup testing programs of these projects might decrease the amount of dependent errors.

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Pursuant to Article 1 of the Convention signed in Paris on 14th December 1960, and which came into force on 30th September 1961, the Organisation for Economic Co-operation and Development (OECD) shall promote policies designed:− to achieve the highest sustainable economic growth and employment and a rising standard of living in Member countries, while maintaining financial stability, and thus to contribute to the development of the world economy; − to contribute to sound economic expansion in Member as well as non-member countries in the process of economic development; and − to contribute to the expansion of world trade on a multilateral, non-discriminatory basis in accordance with international obligations.The original Member countries of the OECD are Austria,

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