Annealing option of Loviisa Unit-1

Matti Valo, Ralf Ahlstrand, Pentti Rajamäki

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional


Irradiation embrittlement of the pressure vessel was found to be higher than expected in the Loviisa units after a few years of operation. The adaptive measures taken by the utility and the implemented new research programmes to support the annealing option are described. Most of the measures available to reduce the neutron dose to the pressure vessel and to soften transients in thermal shock have been taken. The amount of surveillance material, especially weld, is limited and techniques to utilize it effectively in annealing and reirradiation studies are described. The utility is prepared to anneal Unit-1 in 1996.
Original languageEnglish
Title of host publicationInternational workshop on WWER-440 reactor pressure vessel embrittlement and annealing
Place of PublicationVienna
PublisherInternational Atomic Energy Agency IAEA
Number of pages11
Publication statusPublished - 1994
MoE publication typeD3 Professional conference proceedings
EventInternational Workshop on WWER-440 Reactor Pressure Vessel Embrittlement and Annealing - Zavazna Poruda, Slovakia
Duration: 29 Mar 199431 Mar 1994


ConferenceInternational Workshop on WWER-440 Reactor Pressure Vessel Embrittlement and Annealing
CityZavazna Poruda


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