HERDNEDHALLNINGSANORDNING FOR VATTENKYLD KERNREAKTOR

摘要

A nuclear reactor having a seal plate dividing the vessel into an upper high pressure plenum and a lower low pressure or outlet plenum. A piston is located at the seal plate with its upper surface exposed to the high pressure and its lower surface exposed to the lower pressure. A push rod attached to the piston extends downwardly in butting relationship with fuel assemblies to hold them down.