BWR type reactors

Purpose: To facilitate maintenance works by the reasonable arrangement of pipeways to a pressure vessel while avoiding the interference of penetration members from a dry well and a pressure suppression chamber. Constitution: Connecting pipes radially passing through the toroidal pressure suppression chamber surrounding the dry well are provided. Penetration members from the dry well are passed through the connecting pipes and taken out on the outer wall of the reactor building. The penetration members do not impair the function of the pressure suppression chamber. Bellows are provided between the connecting pipes and the through holes on the pressure suppression chamber for absorbing the relative displacement between them. Disposition of the penetration members from the dry well to the pressure suppression chamber can eliminate the need of locating the pressure suppression chamber near the floor of the reactor building and also remove the positional restrictions for various instruments and pipelines. (Ikeda, J.)