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In the summer of 1993 OKG decided to undertake a full investigation of Oskarshamn 1 after finding cracks in the pipework and flaws on internal parts of the reactor vessel. The investigation project was named Fenix, and attracted quite a bit of international attention as both inspections and work was carried out in the reactor vessel.
A modernisation plan was established to ensure that Oskarshamn 1 could stand up to future demands, regarding both safety and availability. Several internal reactor parts, such as the moderator tank and lid were replaced, so were the isolation valves in the main recirculation system.
A new safety concept
A new safety concept was implemented and it included a computer-based reactor protection system, installed during the final modernisation phase in 2002. A number of changes had to be implemented in the control room environment. An extensive reconstruction of the control room took place in 2002. Parallel with the development of a new control room, a simulator for Oskarshamn 1 was built to meet the needs of future training for the control room operators.
Most of the upgrade work at Oskarshamn 1 was in one way or another related to safety issues but a turbine replacement was also carried out since the old turbine had been subject to extensive wear. The new shape of the low-pressure turbine made it possible to raise the output by 22 MW even though the thermal power of Oskarshamn 1 remained the same.
Modernisation continues
In September 2004, a modernisation plan for Oskarshamn 2 was established. The plan comprises an installation of a new main transformer, a new generator, a new low pressure turbine and the implementation of a new reactor protection system. In addition to this, a new turbine control system will be installed and consequently the control room will be redesigned. OKG is also investigating the feasibility of a power increase at Oskarshamn 3, raising the output from 1200 MW to 1450 MW.
Page updated Thursday, April 28, 2005
Printed Thursday, September 09, 2010
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