Construction of these reactors started between 1984 and 1991, but full commercial operation did not begin until between 2000 and 2002 because of thermal fatigue flaws in the heat removal system requiring the redesign and replacement of parts in each N4 power station.
这些反应堆的建造工作始于1984年至1991年，但直到2000年至2002年才开始全面商业运行，因为散热系统存在热疲劳缺陷，需要在每个N4发电站重新设计和更换部件。