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Cite this document
The degree of degradation of a reactor pressure vessel (RPV) is partly evaluated from the change of mechanical properties with neutron fluence. Knowledge of neutron fluence is a key item in this evaluation—both to provide plant life assurance and/or an extension to operational life. The results of the projects AMES Dosimetry and MADAM are presented in this paper. Both projects have been executed in the framework of the European network AMES (Ageing Materials Evaluation and Studies), and co-financed by the European Commission under the Euratom Specific Nuclear Fission Safety Programme 1994–98. The main results of these projects are: • The specification for two AMES COmmon Reference Dosimeters (ACORD). A dosimeter intended for material test irradiations and a dosimeter for irradiations in the cavity of NPPs. • An irradiation program addressed to analyse the effects of irradiation temperature, neutron dose and spectrum. • A neutron spectrum library that can be used for the conversion of damage data obtained in a certain spectrum to data valid for a reference spectrum. • A review on retrospective dosimetry. Some chemical procedures are given to enhance the gamma-counting accuracy of several reaction activities. • An analysis of the impact of uncertainties in neutron fluence and chemical composition on embrittlement trend curves. • A state-of-the-art report on neutron dosimetry. • A pilot database, to correlate results obtained using different damage indexes. The dosimetry data come from irradiations performed in different type of reactors. Namely, PWR, BWR, WWER, Magnox and material test reactors.
Euratom, AMES, irradiation, retrospective dosimetry, database
Tecnatom S.A., Madrid,
JRC-IAM of European Commission, ZG Petten,