Nuclear reactor control device

Claim 1

NUCLEAR REACTOR CONTROL DEVICE COMPRISING A VERTICAL CHANNEL IN THE REACTOR CORE SUBJECTED TO A PRESSURE EQUAL TO THE PRESSURE IN THE FUEL CHANNELS, A RESERVOIR LOCATED AT A LEVEL ABOVE THE LEVEL OF THE VERTICAL CHANNEL ADAPTED TO RECEIVE NEUTRON-ABSORBING MATERIAL IN DIVIDED FORM, VALVE MEANS BETWEEN THE RESERVOIR AND THE CHANNEL COMPRISING A STATIONARY SEAT, A CLOSURE MEMBER, MEANS RESPONSIVE TO THE DIFFERENCE BETWEEN THE PRESSURE IN THE VERTICAL CHANNEL AND AN ADJUSTABLE PRESSURE IN THE RESERVOIR FOR HOLDING AND SAID CLOSURE MEMBER ON SAID SEAT AND A SYSTEM FOR RETURNING THE DIVIDED MATERIAL FROM THE CHANNEL TO THE RESERVOIR, SAID SYSTEM COMPRISING A VERTICAL TUBE WHICH DIPS DOWN AS FAR AS THE BASE OF THE VERTICAL CHANNEL AND WHICH IS CONNECTED AT ITS TOP END TO A CHAMBER DISPOSED ABOVE THE RESERVOIR, SUCH CHAMBER BEING CONNECTED THERETO BY WAY OF A LOCK HAVING TWO VALVES, FIRST MEANS BEING PROVIDED TO CONTROL THAT OF THE LASTMENTIONED TWO VALVES WHICH IS DISPOSED BETWEEN SUCH CHAMBER AND SUCH LOCK, SECOND MEANS BEING PROVIDED TO CONTROL THAT OF THE LAST-MENTIONED TWO VALVES WHICH IS DISPOSED BETWEEN THE LOCK AND RESERVOIR, AND THIRD MEANS BEING PROVIDED TO ADJUST THE AIR PRESSURE IN SUCH CHAMBER TO AN APPROPRIATE VALVE BELOW THE VALUE IN THE VERTICAL CHANNEL.