Olkiluoto Modernization

Rastas, Ami
January 2003
Nuclear Plant Journal;Jan/Feb2003, Vol. 21 Issue 1, p32
Trade Publication
A Finnish utility, Teollisuuden Voima Oy (TVO) modernized its two identical BWR units in Olkiluoto, Finland after an operation period of about 15 years. The main technical goals of the extensive modernization program from 1994-1998 were enhanced safety, increased production, extended lifetime and enlarged staff expertise. The modernized units fulfill most of the advanced safety requirements applicable to new nuclear power plants in Finland. The net output of each unit was increased from 710 MWe to 840 MWe (18.3%) by uprating the thermal power and by increasing the thermal efficiency. The operation license was renewed to be valid until 2018. Plant modifications, implemented during annual outages, have proven successful. The average capability factors during (19941998) and after (1999-2001) the modernization program have been 94.2% and 96.2%, respectively.


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