US 4,078,969 A · Core disruptive accident margin seal

Abstract

An apparatus for sealing the annulus defined between a substantially cylindrical rotatable first riser assembly and plug combination disposed in a substantially cylindrical second riser assembly and plug combination of a nuclear reactor system. The apparatus comprises a flexible metal member having a first side attached to one of the riser components and a second side extending toward the other riser component and an actuating mechanism attached to the flexible metal member while extending to an accessible location. When the actuating mechanism is not activated, the flexible metal member does not contact the other riser component thus allowing the free rotation of the riser assembly and plug combination. When desired, the actuating mechanism causes the second side of the flexible metal member to contact the other riser component thereby sealing the annulus between the components.

Claims10

Dependent claims

A nuclear reactor system including a vessel, fuel assemblies positioned therein, an inlet and an outlet for circulating a coolant in heat transfer relationship with said fuel assemblies, and a closure head disposed on said vessel in a fluid-tight relationship, said closure head comprising:

seal means disposed across a first annulus defined between a first and a second component of said closure head and having one end attached to said first component, and extending across said first annulus to a second end not contacting said second component when not actuated for sealing said first annulus when actuated while allowing free rotation of said components with respect to each other when not actuated;
and
actuating means attached to said seal means for pulling said seal means into contact with said second component for sealing said first annulus.

Dependencies are inferred from the claim text.

Core disruptive accident margin seal

Life of this patent

Core disruptive accident margin seal

Life of this patent

Abstract

Claims10