(Adds Oskarshamn-3, Ringhals-1 and Ringhals-3 restart)     OSLO, Oct 28 (Reuters) - Sweden's 1,400-megawatt (MW) Oskarshamn-3 and 878 MW Ringhals-1 nuclear reactors were restarted over the weekend after being shut on Friday due to technical issues, the plants' operators told the Nordic power exchange.     Another Swedish reactor, 1,063 Ringhals-3 was also back on the grid on Sunday after annual maintenance, and it is expected to reach full capacity on Tuesday.     There were more than 90 percent of Nordic nuclear power capacities available for power generation on Monday morning, Reuters estimates showed. All but two reactors at Oskarshamn power plant in Sweden were in operation.       The following table lists Nordic nuclear units, installed and available net capacity in megawatts, dates for the end of outages and planned maintenance duration.           UNIT      INSTALLED  AVAILABLE   RETURN TO NORMAL   MAINTENANCE PLANNED                 CAPACITY    CAPACITY                        SWEDEN                                                              Forsmark-1       984        984              -           Apr 23-May 14, 2014  Forsmark-2      1,120      1,120             -                      Forsmark-3      1,170      1,170             -           Aug 2-Aug 15, 2015  Oskarshamn-1     473         0            Unknown        Mar 31-May 14, 2014                                                           Apr 20-May 24, 2015  Oskarshamn-2     638         0         Apr 21, 2014      Oct 11-Oct 25, 2014                                                           Jul 1-Oct 13, 2015  Oskarshamn-3    1,400      1,400             -           May 4-May 30, 2014                                                           May 24-Jun 9, 2015  Ringhals-1       878        878              -          March 23-May 11, 2014  Ringhals-2       865        807*             -                    -  Ringhals-3      1,063      1,063             -           May 14-Jun 26, 2014                                                           May 13-Jun 24, 2015  Ringhals-4       940        940              -           Aug 6-Oct 14, 2014  FINLAND                                                           -  Olkiluoto-1      880        880              -           May 11-May 27, 2014  Olkiluoto-2      880        880              -            Jun 1-Jun 8, 2014  Loviisa-1        496        496              -                    -  Loviisa-2        496        496              -                    -  TOTAL          12,283      11,114                                      * - Ringhals-2 maximum power will be limited to 807 MW until annual maintenance planned in 2015.       Sources: Nord Pool Spot, Vattenfall AB, E.ON AG, Fortum Oyj, Teollisuuden Voima Oyj (TVO)      For full outage data on the Nordic power market click on the following link: 
  http://umm.nordpoolspot.com/
    (Reporting by Nerijus Adomaitis)  ((nerijus.adomaitis@thomsonreuters.com)(+47 9027 6699)(Reuters Messaging: nerijus.adomaitis.thomsonreuters@reuters.net))  Keywords: NORDIC NUCLEAR/