Safety rod for liquid-cooled, liquidmoderated nuclear reactor

Claim 1

A SAFETY ROD ASSEMBLY FOR USE IN A LIQUID-MODERATED, LIQUID-COOLED NUCLEAR REACTOR WHEREIN SAID ASSEMBLY DEPENDS INTO THE REACTOR TANK, SAID ASSEMBLY COMPRISING SUPPORT MEANS FOR FIXING SAID ASSEMBLY RELATIVE TO THE TOP OF SAID REACTOR AND DEPENDING DOWNWARDLY THEREINTO, A HOLLOW PISTON ROD HAVING A CLOSED BOTTOM END DEPENDING FROM SAID FIXED SUPPORT, A COAXIAL CYLINDER OF LARGER DIAMETER SLIDABLY SUPPORTED ABOUT SAID PISTON ROD, SAID PISTON ROD AND SAID CYLINDER BEING SPACED APART IN SLIDABLE RELATION BY AN OUTWARDLY ENLARGED CIRCUMFERENTIAL PORTION OF THE BOTTOM OF SAID PISTON ROD AND AN INWARDLY ENLARGED CIRCUMFERENTIAL PORTION OF THE TOP OF SAID CYLINDER SO AS TO FORM A CLOSED CHAMBER THEREBETWEEN OF ADJUSTABLE VOLUUME, AT LEAST ONE APERTURE OF RELATIVELY SMALL DIAMETER AT THE LOWER END OF SAID PISTON ROD COMMUNICATING THE INTERIOR THEREOF WITH SAID CHAMBER, A PRESSURIZING APERTURE AT THE UPPER END OF SAID PISTON ROD AND COMMUNICATING WITH THE INTERIOR THEREOF, AN ABSORPTION ROD CARRIED BY SAID CYLINDER FOR MOVEMENT THEREWITH BETWEEN AN IMMERSED POSITION WITHIN SAID REACTOR TANK AND A WITHDRAWN POSITION, AN ELECTROMAGNET CARRIED BY SAID SUPPORT MEANS AND ADAPTED TO HOLD SAID CYLINDER WITH SAID ABSORPTION ROD IN A WITHDRAWN POSITION AGAINST THE PULL OF GRAVITY WHEN SAID ELECTROMAGNET IS ENERGIZED, A VALVE AT THE UPPER END OF SAID PISTON ROD COMMUNICATING THE UPPER INTERIOR THEREOF WITH SAID REACTOR TANK WHEN SAID VALVE IS OPEN, SAID VALVE BEING CLOSED BY THE ENERGIZATION OF SAID ELECTROMAGNET.