Replacement of shutdown cooling system and repair of nozzle welds of reactor pressure vessel in Forsmark 1 + 2 nuclear power plant

摘要

The Forsmark nuclear power plant consists of three units with boiling water reactors. Unit 1 and Unit 2 were put into operation in 1981 and 1982. Both of these units are of identical design, each having a capacity of 970 MW. Unit 3 was completed in 1985 and has a capacity of 1160MW. In November 1998 Siemens was awarded a Contract to replace the pipework of the two-sectioned Shutdown Cooling System 321 from the nozzles at the reactor pressure vessel to ten meters outside the containment. Moreover, the inner and outer isolation valves including the penetrations were to be replaced. Finally, the repair of the RPV connecting welds of the System 415 (feedwater) and System 323 (emergency cooling) was to be performed.