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Press Release: IAEA awards OKG Good Final Certificate
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2010-12-27: In 2009 the international specialist group from IAEA reviewed the activities at the Oskarshamn Nuclear Power Plant. After a recent follow-up of the company’s plans of action and improvement suggestions it is now clear that OKG has advanced well in its endeavour to attain high international standards. Special good marks are given to the method to minimise the spread of contamination as well as to the handling and check-up on working equipment. The process for experience learning however requires further improvements.
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Press Release: Oskarshamn 3 back in operation
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2010-12-22: Unit Oskarshamn 3 (O3) was restarted yesterday afternoon on 21 December, one day earlier than stated in the original timetable. Together with the turbine contractor, Alstom, OKG has completed short-term measures in the turbine facility in order to secure the electricity production during the winter period.
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Press Release: OKG and Alstom in Agreement – Modified Design of Turbine Bearings at O3 a Necessity
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2010-12-13: OKG and the turbine supplier Alstom have agreed that the newly installed design solution for the turbine bearings at Oskarshamn 3 must be replaced by a modified design. Alstom has devised a modified sustainable solution which is possible to install during summer 2011. However, until then continued big efforts will be made in order to secure the electrical production capable with the present design.
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Press Release: Oskarshamn 3 in Production Again after Comprehensive Outage
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2010-12-03: Late last night, on 2 December, Oskarshamn 3 (O3) resumed its operations again. It was after a more than two months’ long outage interruption which had to be extended due to comprehensive work on the unit’s turbine bearings in order to secure electricity deliveries from O3 during this winter.
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Press Release: One Hundred Billion Kilowatt-hours Produced at Oskarshamn 1 since Start
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2010-11-23: Today on 23 November Oskarshamn 1 (O1) crossed an important mile stone as the reactor now has produced over 100 billion kWh gross output since the inauguration in 1972. The same amount of electricity would be sufficient for four million electrically heated private homes during one whole year.
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Press Release: Oskarshamn 2 back in operation
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2010-11-16: Unit Oskarshamn 2 was on this past Saturday synchronized to the Nordic grid after the annual maintenance outage had been completed according to plan.
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Press Release: Oskarshamn 1 stopped – intense work enables a quick restart of the production at OKG
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2010-10-29: Unit Oskarshamn 1 (O1) was taken off the grid on Friday morning after problems with the generator excitation. During the day intense work were in progress to locate the problem and internal as well as external specialists have been involved in the work in order to being able to resume the production as soon as possible, which was also done during the following night.
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Press Release: Temporary solutions of the problems with the turbine bearings at unit Oskarshamn 3 are intended to result in a more reliable production during the winter
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2010-10-28: OKG has come to an agreement with the contractor of the new turbine equipment at unit Oskarshamn 3 (O3) that a temporary solution on the verified problems with the defective turbine bearings shall be performed.
– This solution will provide us with the required conditions to have a stable supply capacity during the winter, says plant manager Carl-Johan Kemgren. The measure in question will certainly involve that the present outage is extended, this is however preferred to the considerably longer downtime required in order to await permanent solutions.
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Press Release: Oskarshamn 2 Commences Its Yearly Maintenance Work Tasks
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2010-10-27: Oskarshamn 2 (O2) has now started its yearly outage according to plan. The yearly outage is planned to last during 20 days until 12 November.
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Press Release: Measures completed at Oskarshamn 1
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2010-10-21: The production at unit Oskarshamn 1 (O1) is again in operation with full capacity after the latest operational interruption. The unit was taken off the grid on October 12, and during the interruption measures have been performed on the turbine governor valve, which caused the operational interruption.
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Press Release: Operational disturbance at unit Oskarshamn 1
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2010-10-13: Due to problems with a governor valve in the turbine system, unit Oskarshamn 1 (O1) was taken off the grid just before 7 p.m. on Tuesday. Investigation and subsequent planning of measures to be taken is in progress, the timetable is however not yet established.
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Press Release: Oskarshamn 3 initiates this year’s maintenance work somewhat earlier than originally planned
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2010-10-05: On Monday October 4, the annual outage work at unit Oskarshamn 3 was started, six days earlier than originally planned. The outage is scheduled to last until November 8.
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Press Release: Delayed restart during the outage completion at Oskarshamn 1
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2010-09-30: Oskarshamn 1 was on last Sunday evening again synchronized to the grid after a 43 days long stop due to maintenance work. The unit was however taken off the grid again later that same night due to problems with parts of the turbine equipment. The unit was in operation again on Wednesday and it has since then become evident that a planned operational interruption is required in order to perform measures on the flanges of the cooling system for the reactor vessel upper head.
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Press Release: Security of Supply Precedes New Maximum Power at OKG
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2010-09-24: OKG has decided, during the on-coming cold season, to prioritize security of supply before the need of finalizing the trial operations program for the modernized Oskarshamn 3. The production capacity during winter is thus planned to an average of 1,100 MW, which essentially corresponds to the earlier highest supply capability. On 1 March the operational management, however, hopes to resume the tests which are a prerequisite for being able to produce at the new maximum capacity of 1.450 MW.
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Press Release: OKG Reports Deficiency to the Authorities
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2010-09-15: During the final stage of the yearly outage at Oskarshamn 1 OKG has reported, to the Swedish Radiation Safety Authority, insufficient auxiliary power capacity in the system which cools the fuel during the standstill as a deficiency. This deficiency is reported despite the fact that the normal power supply during the whole time was in full operation.
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Continued Turbine Bearing Problems at O3
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2010-09-13: Unsolved problems with a turbine bearing in the conventional turbine equipment cause operational disturbances at Oskarshamn 3.
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Press Release: Oskarshamn 3 in Operation Again
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2010-09-10: On Friday, 10 September, Oskarshamn 3 was again connected to the grid following the operational interruption which was caused by an increased temperature in the turbine equipment.
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Press Release: Operational Disturbance at Oskarshamn 3
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2010-08-29: During the night preceding Sunday the operational management at Oskarshamn 3 decided to interrupt the production due to problems with the conventional turbine equipment. Following the cooling down of the equipment it will be inspected. Earliest on Tuesday it is deemed possible thus to define the root cause of the disturbance at which time decisions will be taken on the necessary measures.
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Press Release: Yearly Maintenance Outage Starts on Oskarshamn 1
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2010-08-13: On Sunday the yearly outage season at OKG will begin with Oskarshamn 1 (O1) leaving the grid. The outage is planned to continue until 21 September.
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Press Release: Oskarshamn 1 Producing Again
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2010-08-06: In the night between Wednesday-Thursday restart of Oskarshamn 1 was commenced following the scram which was caused by a disturbance on the outer grid. The unit was turned to the grid again yesterday at lunch-time.
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Press Release: Short Operational Interruption at Oskarshamn 1
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2010-08-04: In the night between 3 and 4 August Oskarshamn 1 tripped due to a disturbance on the outer grid.
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Press Release: Oskarshamn 3 has been restarted
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2010-07-22: Oskarshamn 3 (O3) was synchronized to the grid again on Wednesday July 21. The reactor was taken off the power grid on July 13 due to a heavy thunderstorm. The output will however be limited for some time and will be on circa 75 per cent (760 MW), as a consequence of problems with the regulation in the turbine condensate system and the previously identified vibrations. With the purpose to attend to these problems, unit Oskarshamn 3 will be shut down for measures between the 4th and 12th of August.
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Press Release: Oskarshamn 3 stopped due to thunderstorm
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2010-07-14: Last night on Tuesday July 13, a thunderstorm caused disturbances to the Swedish power grid, which lead to that Oskarshamn 3 (unit O3) was stopped.
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Press Release: Last Stage of Oskarshamn 2 Modernization To Be Postponed
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2010-07-02: OKG has today decided to postpone the last stage of the modernization of Oskarshamn 2 (O2). According to the original time schedule, the last phase, with among others a power uprate to 840 MW, should have been implemented during the yearly outage 2011. The reason for the postponement is that the mission has appeared to be more comprehensive and complex than earlier assessed.
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Press Release: Oskarshamn 1 Restarted after Short Interruption
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2010-06-18: On Thursday, 17 June, Oskarshamn 1 (O1) was reconnected to the grid following the short operational interruption which lasted somewhat more than a week.
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Press Release: Scram at Oskarshamn 1
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2010-06-07: On last Sunday evening a scram was initiated at Oskarshamn 1 and the unit was taken off the grid. Troubleshooting is at present in progress.
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Press Release: Plugged Sulphoric Acid Leak at OKG Water Plant
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2010-05-27: During Thursday afternoon the Rescue Services plugged a minor hole in a pipe of a tank with sulphoric acid in a water plant of OKG. The sulphoric acid was collected in the container situated under the tank for this purpose and neither personnel nor the environment suffered any damages. An investigation has been initiated which will clarify why the leak could happen.
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Press Release: Oskarshamn 3 Leaves the Grid for a Planned Short Interruption
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2010-05-25: During Sunday Oskarshamn 3 leaves the grid for a planned short operational interruption in order to, among others, exchange fuel.
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Press Release: Government approval for power uprate at Oskarshamn 2
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2010-04-29: After a decision taken on April 29, 2010, the Swedish government has approved the power uprate at Oskarshamn unit O2. The power uprate will be performed in connection to the scheduled third stage of the safety increasing measures in 2011.
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Press Release: Oskarshamn 3 has resumed trial operation
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2010-03-23: On March 20, unit Oskarshamn 3 resumed the electricity production after a planned turbine trip to perform the final tests on the redesigned valves controlling the steam from the reactor to the turbine condenser.
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Press Release: Valve problems the cause behind extended operational interruption of reactor 3 in Oskarshamn
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2010-03-01: After nearly two months of test operation of the modernized third reactor in Oskarshamn, a temporary operational interruption was performed in the middle of February. The date set for resuming the operation has now been postponed. The reason being that the delivered important valves controlling the turbine steam flow have faulty construction and require reconstruction. The new starting date for a few more weeks of test operation has now been preliminary set to March 22.
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Further problems with the valves at Oskarshamn 3
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2010-02-25: The problems with the valves at Oskarshamn 3 have lead to the operational interruption being extended by another week.
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Press Release: Trial Operations at Modernized Oskarshamn 3 Continues - Short Interruption for Measures in Safety Systems Forthcoming
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2010-02-16: In connection with the modernizing activities at Oskarshamn 3 the plant will be turned from the grid in order to attend to one of the facility’s safety systems. During the interruption of operations continued inspections and measures enabling continued ascent to full power will be carried out.
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Press Release: Modernization of OKG’s reactors performed in 2009 provides a basis for future record high production
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2010-01-19: The delays of the extensive modernization work that took place at OKG’s plant last year resulted in a reduction of the electricity supply with approximately forty per cent compared to 2008. To mention one example, the work conducted in order to increase the safety as well as the capacity at Oskarshamn 3 caused a downtime of nine months instead of the planned three months. However, the measures taken create good conditions for future record high production levels.
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Police Present at OKG due to Suspect Handling of Explosives
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2008-05-21: During routine sampling when entering the premises at OKG this Wednesday morning, a so-called smear test indicated that a contractor had handled explosives. Police was called for and the person in question was taken care of.
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Two of three OKG reactors assessed as safe for operation
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2006-09-06: Comprehensive analysis work has resulted in OKG’s assessment that two of the company’s three reactors at the Oskarshamn nuclear plant can handle faults in switches of the type that triggered the incident at Forsmark on July 25.
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Billion SEK investment at OKG to strenghten Nordic electricity supply
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2006-01-20: In 2008 the electrical power output at Oskarshamn 3 will be upgraded to 1 450 MW.
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