Device for controlling a control rod in a nuclear reactor

Claim 1

APPARATUS FOR CONTROLLING A CONTROL ROD IN A NUCLEAR REACTOR COMPRISING A NUCLEAR REACTOR HAVING A REACTOR TANK, A CYLINDER OPEN AT ITS UPPER END AND CLOSED AT ITS LOWER END EXTENDING UPWARDLY THROUGH THE BOTTOM OF SAID TANK, A SLIDE AXIALLY DISPLACEABLE IN SAID CYLINDER, A CONTROL ROD CARRIED BY ONE END OF SAID SLIDE WITHIN SAID TANK, A FIRST SEALING MEANS BETWEEN SAID SLIDE AND SAID CYLINDER DIVIDING SAID CYLINDER INTO AN UPPER CHAMBER SUBJECT TO THE PRESSURE IN SAID REACTOR TANK, A SECOND SEALING MEANS BETWEEN SAID SLIDE AND SAID CYLINDER AND SPACED FROM SAID FIRST SEALING MEANS DIVIDING THE REMAINDER OF SAID CYLINDER INTO A SPACE BETWEEN SAID FIRST AND SECOND SEALING MEANS AND A LOWER CHAMBER, A PRESSURE CONTAINER CONTAINING CONTROL FLUID CONNECTED TO THE SPACE IN SAID CYLINDER BETWEEN SAID FIRST AND SECOND SEALING MEANS, MEANS FOR MAINTAINING THE PRESSURE IN SAID PRESSURE CONTAINER SUBSTANTIALLY EQUAL TO THE PRESSURE IN SAID REACTOR TANK, A CONDUIT CONNECTING SAID PRESSURE CONTAINER TO SAID LOWER CHAMBER AND PRESSURE GENERATING MEANS IN SAID CONDUIT.