| 摘要 |
<p>A nuclear reactor including a pressure vessel having a vessel head (10), a core in the vessel, elements for controlling the reactivity of the core, drive rods which pass through the vessel head (10) for displacing the elements, and a plurality of head adapters (8) which extend through the vessel head (10) and form part of a drive rod housing which is in communication with the interior of the vessel and which is closed at the top. Associated with the housing (8) is a device for forming, around the associated drive rod and within the associated housing, a fluid passage having a cross-sectional area limited to a selected value upon the occurrence of a leak in the respective housing.</p> |
