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When the aluminium reactor vessel of the HFR Petten was replaced in 1984, a new design philosophy was agreed with the licensing authorities, that the reactor can only be operated if it can be demonstrated that the vessel contains no critical defect. The inspection programme includes ultrasonic, eddy current, liquid penetrant, dimensional and visual testing. In-service inspections every three years have shown no change in the new vessel since installation. A new irradiation damage surveillance programme has been started (in 1985) for the new vessel material to provide information on fracture mechanics properties. Compact tension and tensile specimens have been placed in an in-core position and a pool side facility (PSF) position for the proper simulation of the neutron flux conditions of the different walls of the core box. The specimens are scheduled to be removed from irradiation and tested at different intervals of the reactor vessel life.

Additional information

Authors: BIETH M, JRC Petten (NL)
Bibliographic Reference: Paper presented: Topical Seminar on Management of Ageing of Research Reactors, Geeshacht, Hamburg (DE), May 8-12, 1995
Availability: Available from (1) as Paper EN 39118 ORA
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