Irradiation effects on aluminium and beryllium
The High Flux Reactor (HFR) in Petten is a 45 MW light water-cooled and moderated research reactor. In 1984 the HFR vessel was replaced because doubts had arisen over the condition of the aluminium alloy construction material. Fatigue, fracture mechanics (crack growth and fracture toughness) and tensile properties have been obtained from several experimental testing programmes with materials of both the new and old vessels. Irradiation has a minor effect on the sub-critical fatigue crack growth rate. The ultimate increase of the mean crack growth rate amounts to a factor of 2. Crack extension is strongly reduced, however, due to the smaller crack length for crack growth instability (reduction of K(IC)). Furthermore, the effects of embrittlement and swelling induced by irradiation led to the replacement of the HFR beryllium reflector elements which had been in operation for over 25 years. Operational and practical experiences with these reflector elements are discussed here, as well as the main engineering features of the new elements: upper end fittings of both filler element and insert in stainless steel, no radially drilled holes and no roll pins.
Bibliographic Reference: Paper presented: 2nd Meeting of the International Group on Research Reactors (IGOR-II), Saclay (FR), May 18-19, 1992
Availability: Available from (1) as Paper EN 36928 ORA
Record Number: 199210951 / Last updated on: 1994-12-02
Original language: en
Available languages: en